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1 description ltc 3335 nanopower buck-boost dc/dc with integrated coulomb counter demonstration circuit dc2343 a is a complete system level solution for a nanopower buck- boost dc/ dc with integrated coulomb counter. the dc2343a contains a pic16f1459 embedded processor for communication to the pc over usb and the lt c ? 3335 via its i 2 c port. the gui is capable of reading and writing all the control registers on the LTC3335 as well as displaying and resetting all its alarm registers. the firmware and software for the embedded system and the gui are available at the LTC3335 solutions page . the dc2343a uses two analog-to-digital converter channels to sample the battery and output voltages. the voltage samples improve the functionality of the gui, and allow optimal software correction to the measured coulombs. by adding the software correction the first order known errors are compensated for over the operating range and the resultant coulomb count is accurate to within 3%. the dc2343a contains an LTC3335 which is a high ef - ficiency, low quiescent current (680 na) buck- boost dc/ dc l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks and quikeval is a trademark of linear technology corporation. all other trademarks are the property of their respective owners. p erformance s ummary converter with an integrated precision coulomb counter which monitors accumulated battery discharge in long life battery powered applications. the buck-boost can operate down to 1.8 v on its input and provides eight pin selectable output voltages with up to 50 ma of output current. the coulomb counter stores the accumulated battery discharge in an internal register accessible via an i 2 c interface. the LTC3335 features a programmable discharge alarm threshold. when the threshold is reached, an interrupt is generated at the irq pin. to accommodate a wide range of battery types and sizes, the peak input current can be selected from as low as 5 ma to as high as 250 ma and the full-scale coulomb counter has a range from 1.1mah (with 5ma i peak ) to 1793ah (with 250ma i peak ). design files for this circuit board are available at http://www . linear.com/demo/dc2343a specifications are at t a = 25c parameter conditions min typ max units input supply range, v bat 1.8 - 5.5 v buck-boost peak current limit l1 = 100h, r1 = r4 = r5 = installed 100 ma v out output voltage out2 = 1, out1 = out0 = 0 3.3 v max output current 15 ma efficiency v bat = 3.6v, v out = 3.3v, i out = 10ma 86 % dc2343afb demo manual dc2343a
2 o perating p rinciple the demo board is pictured in figure 2 a and figure 2b, with schematics shown in figure 18 and figure 19. the provided usb cable connects the demo board to the pc. with linear technologys quikeval? program running in the background of the pc, a five windowed gui, pictured in figure 6 will pop up. the gui sends high level commands to the onboard microcontroller via the usb interface. the gui receives the raw LTC3335 register values and converts them into application values, which are easily understood by the user. the gui also writes to the internal registers to set the accumulator value and the accumulator alarm threshold . the board is shipped with a peak buck-boost inductor current of 100 ma and an output voltage setting of 3.3v. the board is configurable via jumpers to set the output voltage between 1.8 v and 5 v. using a soldering iron to change the location of some 0 resistors and a different value inductor for the buck-boost converter, the board can be modified to accommodate 5 ma to 250 ma peak inductor current settings. this flexibility is very helpful when working with higher-impedance batteries such as the tadiran primary lithium-thionyl chloride (li-socl2) long life batteries. the demo board can be controlled by the gui or by an external processor. when the jumper assembly on jp5 is in the b-c location the internal processor is con - nected to the LTC3335 device and the gui is able to monitor the status of the registers. the b-c location is the default for the dc2343a, as the pic16 may consume current if left connected to the LTC3335 without the usb cable attached. when the jumper assembly on jp5 is moved to the a-b location, the onboard processor is disconnected from the LTC3335. when in this location row c pins can be used to control and monitor the LTC3335 via an external processor. the measurement of the v bat and the v out voltages is done with a sampled adc reading to minimize power dissipation and maintain the available accuracy from the processor adc. refer to page two of the schematic and the v bat voltage measurement components for the fol- lowing discussion . resistor r18 and capacitor c11 form a 1.6 khz low-pass filter to remove the high frequency switching noise from the v bat measurement. m1 is a combination of a pfet and nfet configured with the pfet as a pass device and the nfet along with resistor r24 performing the function of a level translator to turn on and off the pfet with the gn1 signal. this allows the use of relatively low valued resistors ( r25 and r26) as the divider resistors into the adc. the divider resistors are needed to keep the input signal within the input range of the adc (0 v to 4.096 v). for the processor used on the board the, input resistance to the adc is recommended to be less than or equal to 10 k. both voltage sampling circuits (v bat and v out ) are controlled by the same signal. at a 3 second sampling rate, the pfets are turned on for 120s to perform the adc conversions. performing both conversions within 120 s every 3 seconds can add as much as 35 na to the input current under worst-case conditions when the battery is at 1.8 v and the output voltage is set to 5 v. under normal operation where the battery is 3.6v and the output voltage is 3.3 v, the voltage sampling adds approximately 15na to the input current. for a more details about the operation of the LTC3335 ic please, refer to the LTC3335 data sheet. connecting a dc9003a-b dust mote when connecting a dc9003 a-b dust mote to the dc2343a demo board, two resistors in the dust mote must be changed for the mote to switch over from the battery power to the output of the LTC3335, when pgood goes high. change resistor r3 to 750 k and change r4 to 5.1m, on the dust mote demo board. in addition, connect j3 pin 3 to e6 (gnd). dc2343afb demo manual dc2343a
3 i load (ma) efficiency (%) 90 80 100 10 100 dc2343a f01 60 50 40 30 10 20 70 0 0.01 1.0 0.001 0.1 v out = 5v v out = 3.3v v out = 2.5v v out = 1.8v bat = 3.6v l = 100h dcr = 0.6 figure 1. LTC3335 buck-boost efficiency vs load current and v out for 100ma i peak setting figure 2. dc2343a demo board pictures (a) top (b) bottom o perating p rinciple dc2343afb demo manual dc2343a
4 quick s tart p roce d ure refer to figure 3 for the proper measurement and equip- ment setup . use twisted pair leads for the power connec- tions and the load, and connect the equipment with the power supply off. follow the procedure below. 1. to use the dc2343a, the pc must first have the proper software driver and gui installed. download the quikeval software from www.linear.com and in - stall the quikeval software by running the executable ltcqev.exe. follow the instructions to connect the dc2343a. if you fail to unplug the dc2343a, the dc2343a driver will not install! when installation of quikeval is com- plete, close the quikeval program. 2. move jumper jp5 on the dc2343a from the a-b posi- tion to the b-c position to enable the communication from the pic16 to the LTC3335 device. 3. reopen quikeval, and then connect the dc2343a to confirm that the quikeval software was installed correctly. if properly installed, quikeval will show the following message: press ok to download and open the software for the dc2343 a . once the software has been installed, the gui will launch automatically. close the quikeval software, as it is no longer needed for the dc2343a. 4. when the dc2343a is connected to the pc, the pic16 indicates it is powered through its board status leds . these leds are also replicated in the gui, to indicate the state of the pcb. the green led flashes quickly when a board is con - nected but its v bat input is not powered, and slowly when a board is connected with voltage applied to v bat . the amber led turns on when the pic16 is communicating with the LTC3335. 5. set ps1 to 5 v. the dc2343a will see battery voltage and flash the green led with a 1 second period. the gui will then launch the window in figure 8 to ask for a battery description. typically the characteristics of an actual battery would be entered. for a quick demonstration of the LTC3335, however, enter these values to simulate a very small battery with power supply ps1: a. battery capacity (ah) = 0.02 b. battery coulombs (% discharged) = 0.00 battery alarm (% discharged) = 80.00 6. set load1 to 20 ma: the accumulator counter will increment every 49.4 seconds as calculated below: battery capacity = 20ma ? hr input current = 6.26ma t otal counts to 100% = 233 secs per accumulator increment = battery capacity input current ? 1 total counts to 100% ? 3600 s hr secs per accumulator increment = 49.363 sec 7. the gui can also show an estimated battery current . in order to demonstrate that gui feature. activate the battery current measurement feature described in figure 12, item 7. in order to implement this feature, the pic16f1459 on the dc2343a counts edges on the irq pin over time, which can then be converted to coulombs per second. dc2343afb demo manual dc2343a
5 quick s tart p roce d ure measured (ma) v out / v b at 1.8 2 2.5 3 3.5 4 4.5 5 5.5 1.8 20.63 22.13 25.08 27.40 29.23 30.78 32.09 33.25 34.26 2.5 17.68 19.18 22.18 24.55 26.53 28.17 29.62 30.93 32.04 2.8 16.62 18.07 21.06 23.43 25.42 27.11 28.56 29.86 31.07 3 15.94 17.39 20.34 22.71 24.69 26.38 27.88 29.23 30.39 3.3 15.02 16.42 19.37 21.69 23.67 25.42 26.91 28.27 29.48 3.6 14.20 15.55 18.45 20.77 22.76 24.45 26.00 27.35 28.56 4.5 12.14 13.43 16.13 18.36 20.29 21.98 23.48 24.88 26.09 5 11.23 12.46 15.02 17.20 19.10 20.77 22.27 23.67 24.93 figure 3. measured maximum output current vs v out and v b at for i peak = 100ma, l1 = 100h figure 4. proper measurement equipment setup dc2343afb demo manual dc2343a
6 u sing the ltc 3335 s oftware the dc2343a gui consists of five windows: 1. the control panel window displays the components on the dc2343a pcb and their relationship with the users battery. the other four windows are shown by clicking or double clicking on the controls circled on the control panel in figure 6. 2. the batter y selection window allows the user to specify the battery that they have connected to the dc2343a. this information is necessary for the gui to properly configure the LTC3335, and interpret the values read from the ic. this window will automatically popup the first time that a battery is attached to the dc2343a. 3. the en jumper window displays the options for jp1 on the dc2343a. the position of this jumper is not important to the operation of the gui, although communication with the LTC3335 is not possible un- less this jumper is in the on position. 4. the out jumpers window displays the options for jp2Cjp4 on the dc2343a. the position of this jumper is not important to the operation of the gui. it will only specify the output voltage when the LTC3335 is configured for hardware_control ( default). 5. the i peak selection window configures the gui so that it will properly interpret the values read from the LTC3335. it is set to the factory configuration of 100ma by default. if a user modifies the i peak setting by changing l1 and r1Cr6 on the dc2343a, they must reconfigure the pcb through this screen for the gui to continue interpreting the values read from the LTC3335 properly. figure 5. measuring input or output ripple quick start p roce d ure dc2343afb demo manual dc2343a
7 figure 6. dc2343a gui navigation u sing the ltc 3335 s oftware dc2343afb demo manual dc2343a
8 u sing the ltc 3335 s oftware the control panel window displays the components on the dc2343a pcb and their relationship with the users battery. the features of this window are shown in figure 7. 1. this graphic shows the relationship between the user s battery and the LTC3335 coulomb counter. when the LTC3335 is properly configured, the battery capacity will always be between 128 and 255 counts. the green line represents the accumulator value, the red line rep - resents the alarm value, and the black line represents the battery capacity. these lines can be clicked and dragged to modify the LTC3335 register values. 2. these indicators display the battery characteristics as a % of capacity and in ah. 3. the indicators display the resolution and range of the LTC3335 coulomb counter for its given i peak and prescaler configuration. the range text will be red if the LTC3335 is configured for a range that is less than 100% the batterys capacity. the resolution text will be red if the LTC3335 is not configured for at least 0.78% the batterys capacity per count. 4. these indicators show the values of the LTC3335 in - puts for which the gui has been configured. clicking these inputs will bring up a window where they can be changed. only the ipk[2:0] bits affect the operation of the gui. 5. checking this box will expose additional controls for the LTC3335. see the control panel advanced mode in figure 12. 6. the indicators show the status of the pgood and irq outputs from the LTC3335. 7. checking this box will expose additional controls for the pic16f 1459. see the control panel advanced mode in figure 12. 8. gui events are recorded in this log, such as battery connection, modification of LTC3335 registers, and changes of the pgood and irq outputs. the log can be maintained after the gui is exited, to create a record over a long time in which gui is periodically used to monitor a dc2343a. 9. the pic16f1459 measurements of the v bat and v out voltages are presented here. note that these adc measurements can consume up to 35 na of the battery current, and will occasionally cause the LTC3335 to turn on in order to replace the charge lost from v out when the adc measurement is done. 10. the status leds provide information about the dc2343a operation. their behavior mirrors the leds on the dc2343a pcb. ? the green led will flash quickly if a dc2343a is not attached or if a battery is not present. it will flash slowly if the dc2343a is attached with a battery in an acceptable range for the dc2343a. ? the amber led will flash each time the pic16f1459 communicates with the LTC3335. 11. the typical error is displayed for the current i peak , v bat , and v out conditions of the LTC3335. if the checkbox is selected to correct the coulomb count with software, the accumulator will be adjusted by the typical error to reduce this error. see the software coulomb counter correction section for information about software error correction. 12. these buttons provide links to the lt c website for information about the LTC3335 ic and the dc2343a software. dc2343afb demo manual dc2343a
9 u sing the ltc 3335 s oftware figure 7. control panel window dc2343afb demo manual dc2343a
10 u sing the ltc 3335 s oftware the battery selection window allows the user to specify the battery that they have connected to the dc2343a. this information is necessary for the gui to properly configure the LTC3335, and interpret the values read from the ic . this window will automatically popup the first time that a battery is attached to the dc2343a. note that none of the values in this value will be written to the LTC3335 until the ok button is pressed, allowing experimentation by the user to see the relationship between their battery characteristics and the LTC3335 settings. the features of this window are shown in figure 8. 1. this graphic shows the relationship between the user s battery and the LTC3335 coulomb counter. when the LTC3335 is properly configured, the battery capacity will always be between 128 and 255 counts. the green line represents the accumulator value, the red line rep - resents the alarm value, and the black line represents the battery capacity. these lines can be clicked and dragged to modify the LTC3335 register values. 2. these indicators display the battery characteristics as a % of capacity and in ah. 3. the indicators display the resolution and range of the LTC3335 coulomb counter for its given i peak and prescaler configuration. this range text will be red if the LTC3335 is configured for a range that is less than 100% the batterys capacity. this resolution text will be red if the LTC3335 is not configured for at least 0.78% the batterys capacity per count. 4. the battery characteristics are the simplest method of configuring the LTC3335. enter the battery capacity in ah to set the LTC3335 prescaler to the value that pro - vides enough range for that battery while maintaining the highest possible resolution. enter the discharged capacity and alarm threshold as a % of battery capacity. 5. alternatively, the LTC3335 prescaler, accumulator, and alarm values can be set directly. the battery characteristics will be updated to show the physical meaning of the LTC3335 units. 6. the typical error is displayed for the current i peak , v bat , and v out conditions of the LTC3335. if the checkbox is selected to correct the coulomb count with software, the accumulator will be adjusted by the typical error to reduce this error. see the software coulomb counter correction section for information about software error correction. 7. pr ess the ok button to write the LTC3335 configuration selected in this window to the dc2343a and return to the control panel. press cancel to return to the control panel without modifying the dc2343a configuration. dc2343afb demo manual dc2343a
11 u sing the ltc 3335 s oftware figure 8. battery selection window dc2343afb demo manual dc2343a
12 figure 9. en jumper window u sing the ltc 3335 s oftware the en jumper window displays the options for jp1 on the dc2343a. the position of this jumper is not important to the operation of the gui, although communication with the LTC3335 is not possible unless this jumper is in the on position. the features of this window are shown in figure 9. 1. click on one of the three options ( on, ext, or off ) to inform the gui of the position of this jumper. although this selection is displayed in the gui, it is not used by any calculations and is unimportant to gui operation. 2. press the ok button to write the en jumper position selected in this window to the dc2343a and return to the control panel. press cancel to return to the control panel without modifying the dc2343a configuration. dc2343afb demo manual dc2343a
13 u sing the ltc 3335 s oftware figure 10. out jumpers window the out jumpers window displays the options for jp2 C jp4 on the dc2343a. the position of these jumpers are not important to the operation of the gui. it will only specify the output voltage when the LTC3335 is configured for hardware_control ( default). the features of this window are shown in figure 10. 1. click on one of the eight options to inform the gui of the position of the jumpers specify the output voltage when the LTC3335 is configured for hardware_ con - trol. although this selection is displayed in the gui, it is not used by any calculations and is unimportant to gui operation. 2. press the ok button to write the out jumper positions selected in this window to the dc2343a and return to the control panel. press cancel to return to the control panel without modifying the dc2343a configuration. dc2343afb demo manual dc2343a
14 u sing the ltc 3335 s oftware figure 11. i peak selection window the i peak selection window configures the gui so that it will properly interpret the values read from the LTC3335. it is set to the factory configuration (100 ma) by default. if a user modifies the i peak setting by changing l1 and r 1 C r6 on the dc2343a, they must reconfigure the pcb through this screen for the gui to interpret the values read from the LTC3335. the features of this window are shown in figure 11. 1. select one of the eight options to inform the gui of the population of the resistors which configure the i peak setting of the LTC3335. the other controls on this window will update to show the proper resistors and inductor population for the selected i peak setting. 2. double click the resistors to inform the gui which are populated on the dc2343a. the i peak setting cor- responding to the selected resistors will be displayed as well as the corresponding inductor value. 3. select one of the inductors to inform the gui which value is populated on the dc2343a. the of the popula - tion of the resistors which configure the i peak setting of the LTC3335. the i peak setting corresponding to the inductor will be displayed as well as the corresponding resistor population. 4. press the ok button to write the i peak configuration selected in this window to the dc2343a and return to the control panel. press cancel to return to the control panel without modifying the dc2343a configuration. dc2343afb demo manual dc2343a
15 u sing the ltc 3335 s oftware when the show advanced options checkbox is selected for the LTC3335 and pic16f1459 on the control panel, several additional controls are exposed to the user. these controls are in figure 12. 1. the estimated battery current is displayed when the battery current estimate button is turned on with the button in item 7. 2. the registers in the LTC3335 can be written and read directly with these input fields. 3. these checkboxes display which alarms are currently active in the LTC3335. if an alarm is present, the clear alarm button will allow it to be cleared if the alarm con - ditions are no longer present and the proper registers have been reset. figure 12. control panel windowadvanced options 4. the counter test can be turned on and off in this field, with the number of irq edges per seconds displayed below. 5. the serial number and firmware revision of the pic16f1459 are displayed in these fields. 6. the rate at which the gui polls the LTC3335 is controlled by this dropdown box. a special method of polling is available where the accumulator is only read following a falling edge on the int pin. when using this mode, the alarm setting is not available to the user as it is always set by the gui to be one less than the current accumulator value. 7. this button will turn on the counter test function, and use the pic16f1459 to convert the number of irq edges per second into a battery current estimate. dc2343afb demo manual dc2343a
16 the LTC3335 accuracy is impressive when configured for high values of i peak . when configured with low values of i peak , however, there can be up to 40% error. the dc2343a gui contains algorithms to correct for this error based upon the i peak , v out , and v bat conditions of the dc2343a. although the gui uses the sampled v out and v bat values for correction, most applications could use fixed values for v out and v bat if they are expected to be relatively constant. the standard population of the dc2343a is configured for an i peak value of 100 ma. the typical coulomb counter error for this board is shown in figure 13. as the LTC3335 is already accurate within 2% in this configuration, there is little value to software correction. software correction is also very difficult as the actual error can vary a lot about the average error. the typical coulomb counter error for the dc2343a re - configured for an i peak of 5 ma is shown in figure 14. in this configuration the LTC3335 can have significant errors over 30%. since the error is predictable and the actual error varies little of the average error, the gui is able to apply a correction factor to the LTC3335 accumulator to produce a more accurate coulomb count. when software correction of the coulomb count is not enabled in the battery selection window, the accumula - tor is simply multiplied by the expected resolution for the ltc33 35 i peak and prescaler values. if software correction s oftware c oulomb c ounter c orrection figure 13. typical dc2343a coulomb counter error with i peak = 100ma, v out = 3.3v, temp = 25c of the coulomb count is enabled in the battery selection window, the expected resolution is adjusted by the typical error so that the battery capacity, discharge, and alarm values can be more accurate translated to values in the LTC3335 accumulator. figure 15 shows the effect of enabling the software coulomb count correction in the battery selection window. since the LTC3335 is expected to undercount 26.69% under the starting conditions, the alarm and capacity values are decreased to reflect the additional coulombs represented by each count in the LTC3335 accumulator. clicking ok in the battery selection window will return the gui to the control panel. when using the software correc - tion of the coulomb count in the control panel, the error correction is continuously updated to reflect the different error at the different battery conditions . in addition, the quiescent current drawn by the LTC3335 is taken into ac- count by the gui. for this reason, the coulomb count in the battery graphic can become unsynchronized with the accumulator value in the LTC3335 as shown in figure 16. the worst case of the this would occur if the LTC3335 were left for a very long time with no load as the battery would eventually become 100% discharged due to quiescent losses although the accumulator would remain at 0. this worst case scenario, however, would take several years to complete with most batteries. an example of a discharge with and without software coulomb count correction is shown in figure 17. figure 14. typical dc2343a coulomb counter error with i peak = 5ma, v out = 3.3v, temp = 25c v bat (v) coulomb counter error (%) 2.0 1.5 2.5 3.8 5.3 dc2343a f13 0.5 0 ?0.5 ?1.0 ?2.0 ?1.5 1.0 ?2.5 2.3 3.3 4.84.3 1.8 2.8 actual error average error v bat (v) coulomb counter error (%) ?10 3.8 5.3 dc2343a f14 ?15 ?20 ?30 ?25 ?35 2.3 3.3 4.84.3 1.8 2.8 actual error average error dc2343afb demo manual dc2343a
17 figure 15. effect of software coulomb count correction in battery selection window figure 16. software correction control panel s oftware c oulomb c ounter c orrection figure 17. effect of software coulomb count correction for discharge with 5ma i peak time (s) discharged capacity (ah) accumulator counts 0.0012 4000 8000 dc2343a f17 0.0010 0.0008 0.0004 0.0006 0.0002 0 250 200 150 50 100 0 1000 3000 7000 5000 6000 0 2000 coulomb count with correction actual coulomb count coulomb count no correction LTC3335 accumulator dc2343afb demo manual dc2343a
18 p arts l ist item qty reference part description manufacturer/ part number required circuit components 1 1 c1 cap, chip, x5r, 22f, 20%, 6.3v, 1206 samsung, cl31a226mqhnnne 2 1 c2 cap, chip, x5r, 150f, 20%, 6.3v, 1210 samsung, cl32a157mqvnnne 3 1 c3 cap, chip, x5r, 1000pf, 10%, 50v, 0402 tdk, c1005x5r1h102k 4 2 c4, c5 cap, chip, x5r, 10f, 20%, 6.3v, 0603 murata, grm188r60j106me47d 5 2 c6 cap, chip, x7r, 0.1f, 10%, 50v, 0402 tdk, c1005x7r1h104kt 6 1 c7* *res, chip, 301,1/10w,1%,0603 vishay, crcw0603301rfkea 7 1 c8 cap, chip, x5r, 0.47f, 10%, 16v, 0402 tdk, c1005x5r1c474k 8 2 c11, c12 cap, chip, x5r, 1f, 10%, 25v, 0402 murata, grm155r61e105ka12 9 1 d1 led, yellow orange clear, 0603, smd lite-on, ltst-c190kfkt 10 1 d2 led, green clear, 0603, smd lite-on, ltst-c190kgkt 11 1 l1 ind, smt, 100h, 0.600, 310ma, 4.9mm 4.9mm 3mm coilcraft, lps5030-104mrb 12 2 m1, m2 mosfet, n/p-ch, low-threshold, 20v, 500ma, sc70-6 vishay, si1553cdl 13 3 r1, r4, r5 res, chip, 0 jumper, 1/10w, 0603 vishay, crcw06030000z0ed 14 3 r7, r8, r16 res, chip, 10k, 5%, 1/16w, 0402 vishay, crcw040210k0jned 15 1 r9 res, chip, 1k, 5%, 1/16w, 0402 vishay, crcw04021k00jned 16 1 r10 res, chip, 1, 5%, 1/16w, 0402 vishay, crcw04021r00jned 17 1 r15 res ,chip, 301,1/10w,1%,0603 visha y, crcw0603301rfkea 18 1 r17 res,chip, 10m,1/10w,5%,0603 vishay, crcw060310m0jnea 19 2 r18, r19 res,chip, 100,1/10w,1%,0603 vishay, crcw0603100rfkea 20 2 r20, r21 res, chip, 2k, 5%, 1/16w, 0402 vishay, crcw04022k00jned 21 2 r23, r24 res,chip, 49.9k,1/10w,1%,0603 vishay, crcw060349k9fkea 22 2 r25, r27 res,chip, 10.0k,1/10w,1%,0603 vishay, crcw060310k0fkea 23 2 r26, r28 res,chip, 28.7k,1/10w,1%,0603 vishay, crcw060328k7fkea 24 1 u1 ic, smt, nanopower buck-boost with coulomb counter, 3mm 4mm, qfn-20 linear tech., LTC3335eudc#pbf 25 1 u2 8-bit microcontroller with xlp usb, 4mm 4mm, qfn-20 microchip, pic16f1459-i/ml 26 1 u3 module, isolated usb tranceiver with power, 15mm 15mm 5mm, bga44 linear tech., ltm2884cy#pbf additional demo board circuit components 27 0 c9 ( opt ), c10 ( opt ) cap., x7r, 470pf, 250 vac , 10%, 1808 murata, ga342qr7gf471kw01l 28 0 c7 ( opt ) cap, chip, x5r, 10f, 20%, 6.3v, 0603 murata, grm188r60j106me47d 29 0 r2- opt , r3- opt , r6- opt res, chip, 0 jumper, 1/10w, 0603 vishay, crcw06030000z0ed 30 0 r11, r12, r13, r 14 ( opt ) res, chip, 0, 2512, 1.0w vishay, crcw25120000z0eg hardware: for demo board only 31 4 e1, e2, e3, e4 turret, 0.09 dia mill-max, 2501-2-00-80-00-00-07-0 32 6 e5, e6, e7, e8, e9, e10 turret , 0.061 dia mill-max, 2308-2-00-80-00-00-07-0 33 1 jp1 header, 2mm, 14 pos samtec, tmm-104-02-l-s 34 3 jp2, jp3, jp4 header, 2mm, 13 pos samtec, tmm-103-02-l-s 35 4 jp1, jp2, jp3, jp4 shunt, 2mm samtec, 2sn-kb-g 36 1 j1 usb 2.0, micro-b, receptacle, rt , smt te connectivity, 1981568-1 dc2343afb demo manual dc2343a
19 p arts l ist item qty reference part description manufacturer/ part number 37 1 j2 header, 23, 2mm, tht, dual pin wurth, 62000621121 38 1 j3 header, 2.54mm, 12-pin, dust header, 26, key at pin #5 samtec, smh-106-02-l-d-05 39 1 jp5 header unshrouded, 36, thru-hole, vert, 2.54mm samtec, tsw-106-07-l-t 40 1 jp5 (mate) embedded c connect jumper (jp5 mate) linear tech, dc2343a-1-assy1 41 4 stand-off, nylon (snap on), 0.375" tall keystone, 8832 (snap on) dc2343afb demo manual dc2343a
20 s chematic diagram 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 a a b b c c d d notes: unless otherwise specified 1. resistors: ohms, 0402, 1%, 1/16w 2. capacitors: 0402, 10%, 50v *output voltage selection out0 out2 out1 1 10 0 000 vout 0 0 0 0 11 11 1 1 1 0 0 0 111 5.0v 4.5v 3.6v 3.3v 3.0v 2.8v 2.5v 1.8v r3 r6 25ma r5 100ma r3 r2 ipeak ipk0 r1 150ma 5ma 250ma r6 ipk1 r6 r1 r4 r4 r2 r5 50ma r4 r6 r1 15ma r3 ipeak selection install r5 r3 10ma r4 r2 r2 ipk2 r5 r1 dnp 0 dnp l1 470uh 100uh 2200uh 68uh 47uh 220uh 680uh 1000uh on ext off d d = default value d vbat vbat vout scl sda irq dvcc pgood vbat vout size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2343 1 2 nanopower buck-boost dc/dc with n/a LTC3335eud nc bjs 06 - 30 - 15 integrated coulomb counter size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2343 1 2 nanopower buck-boost dc/dc with n/a LTC3335eud nc bjs 06 - 30 - 15 integrated coulomb counter size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2343 1 2 nanopower buck-boost dc/dc with n/a LTC3335eud nc bjs 06 - 30 - 15 integrated coulomb counter revision history description date approved eco rev bjs production - 2 06 - 30 - 15 revision history description date approved eco rev bjs production - 2 06 - 30 - 15 revision history description date approved eco rev bjs production - 2 06 - 30 - 15 e2 gnd r7 10k 5% r2 0603 e10 gnd r8 10k 5% r3 dnp 0603 e9 gnd e8 pgood c1 22uf 1206 6.3v 20% r4 0603 c3 1000pf jp2 out2 0 1 r5 0 0603 e5 en e6 gnd jp3 out1 0 1 e3 3.3v 15ma vout * j3 dust header 2x6 smh-106-02-l-d-05 vsupply 1 nc 2 gnd 3 pgood 4 key 5 vbat 6 rsvd 7 ehorbat 8 i/o 2 9 i/o 1 10 +5v 11 v+ 12 e1 vbat 1.8v - 5.5v e4 gnd r6 0603 jp4 out0 0 1 u1 LTC3335eudc sda 1 dvcc 2 out2 3 out1 4 out0 5 bat 7 pbat 8 sw1 9 pvout 11 vout 12 ipk0 13 ipk1 14 ipk2 15 en 16 gnda 17 sw2 10 pgood 18 irq 19 scl 20 gndd 6 pgnd 21 r9 1k r1 0 0603 c2 150uf 1210 6.3v 20% jp1en 1 2 3 4 l1 100uh lps5030-104mrb e7 dvcc figure 18. dc2343a demo circuit schematic dc2343afb demo manual dc2343a
21 information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. s chematic diagram figure 19. dc2343a demo circuit schematic a a b b c c d d e e 4 4 3 3 2 2 1 1 notes: unless otherwise specified 1. resistors: ohms, 0402, 1%, 1/16w 2. capacitors: 0402, 10%, 50v 0603 close to j1.1 0603 0603 icd interface opt isolation bypass components: 2512 for 5mm clearance opt opt opt c4 only used in non-isolated case dc2343a-1-assy1 install options: - on board processor operation: - jp5 row b connects to jp5 row c - dust or other processor connection: - jp5 row a connects to jp5 row b - dvcc connects to i/o supply - signals to/from LTC3335 connect to jp5-cx ba ** ** install dc2343a-1-assy1 onto jp5 rows a and b opt opt vccin vcc vcc sda pgood dvcc scl vcc vbat vout irq size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2343 2 2 nanopower buck-boost dc/dc with n/a nc bjs 06 - 30 - 15 integrated coulomb counter gui interface size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2343 2 2 nanopower buck-boost dc/dc with n/a nc bjs 06 - 30 - 15 integrated coulomb counter gui interface size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2343 2 2 nanopower buck-boost dc/dc with n/a nc bjs 06 - 30 - 15 integrated coulomb counter gui interface r10 1.0 5% r22 dnp 0603 1 2 34 87 10 9 12 11 56 dc2343a-1-assy1 tsw-106-07-l-t r14 0 r16 10k 5% m1 si1553cdl sn1 1 gn1 2 dp2 3 sp2 4 gp2 5 dn1 6 r27 10k 0603 r15 301 0603 r18 100 0603 r12 0 r20 2.00k 5% r17 10m 0603 5% c8 0.47uf 16v r26 28.7k 0603 r11 0 c11 1uf 25v d1 orng led r24 49.9k 0603 j1 usb micro b receptacle 1981568-1 vbus 1 d- 2 d+ 3 id 4 gnd 5 gnd 6 gnd 7 gnd 8 gnd 9 gnd 10 gnd 11 u3 ltm2884cy d1+ a2 d1- a1 spnd-pwr a3 on a4 vlo a5 gnd b1 gnd b2 gnd b3 gnd b4 gnd b5 gnd b6 gnd b7 gnd b8 gnd b9 gnd b10 gnd b11 gnd2 k1 gnd2 k2 gnd2 k3 gnd2 k4 gnd2 k5 gnd2 k6 gnd2 k7 gnd2 k8 gnd2 k9 gnd2 k10 gnd2 k11 gnd2 l3 gnd2 l4 gnd2 l6 gnd2 l7 gnd a6 vbus a7 vcc a8 vcc a9 vcc a10 vcc a11 d2- l1 d2+ l2 vlo2 l5 vcc2 l8 vcc2 l9 vcc2 l10 vcc2 l11 r25 10k 0603 c5 10uf 6.3v 20% c12 1uf 25v m2 si1553cdl sn1 1 gn1 2 dp2 3 sp2 4 gp2 5 dn1 6 j2 wurth-62000621121 1 2 3 4 5 6 c7* 301 ohms jp5 tsw-106-07-l-t 1c 1a 2c 3c 4c 5c 6c 1b 2b 2a 3b 3a 4b 4a 5b 5a 6b 6a r13 0 u2 pic16f1459-i/ml vusb3v3 14 ra5 19 vss 17 ra4 20 rc5 2 rc4 3 rc3 4 rc2 11 rc1/icspclk 12 rc0/icspdat 13 ra0/d+/icspdat2 16 ra1/d-/icspclk2 15 ra3/mclr/vpp 1 vdd 18 rc6 5 rc7 6 rb7 7 rb6 8 rb5 9 rb4 10 epad 21 c10 470pf 1808 250vac r23 49.9k 0603 c4 10uf 6.3v 20% c6 0.1uf d2 grn led r21 2.00k 5% r28 28.7k 0603 r19 100 0603 c9 470pf 1808 250vac dc2343afb demo manual dc2343a
22 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com ? linear technology corporation 2015 lt 1016 rev b ? printed in usa demonstration board important notice linear technology corporation (ltc) provides the enclosed product(s) under the following as is conditions: this demonstration board ( demo board) kit being sold or provided by linear technology is intended for use for engineering development or evaluation purposes only and is not provided by ltc for commercial use. as such, the demo board herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. as a prototype, this product does not fall within the scope of the european union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. if this evaluation kit does not meet the specifications recited in the demo board manual the kit may be returned within 30 days from the date of delivery for a full refund. the foregoing warranty is the exclusive warranty made by the seller to buyer and is in lieu of all other warranties, expressed, implied, or statutory, including any warranty of merchantability or fitness for any particular purpose. except to the extent of this indemnity, neither party shall be liable to the other for any indirect, special, incidental, or consequential damages. the user assumes all responsibility and liability for proper and safe handling of the goods. further, the user releases ltc from all claims arising from the handling or use of the goods. due to the open construction of the product, it is the users responsibility to take any and all appropriate precautions with regard to electrostatic discharge. also be aware that the products herein may not be regulatory compliant or agency certified (fcc, ul, ce, etc.). no license is granted under any patent right or other intellectual property whatsoever. ltc assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. ltc currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. please read the demo board manual prior to handling the product . persons handling this product must have electronics training and observe good laboratory practice standards. common sense is encouraged. this notice contains important safety information about temperatures and voltages. for further safety concerns, please contact a ltc application engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation dc2343afb demo manual dc2343a

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