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tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 1 - july, 2005 6-channel electronic volume controller ic pt2258 description pt2258 is a 6-channel electronic volume controller ic utilizing cmos technology specially designed for the new generation of av multi-channel audio system. pt2258 provides an i 2 c control interface, an attenuation range of 0 to -79db at 1db/step, low noise, and high channel separation. housed in 20 pins, dip or sop, pt2258?s pin assignments and applic ation circuit are optim ized for easy pcb layout and cost saving advantages. features ? cmos technology ? low power consumption ? least external components ? attenuation range: 0 to -79db at 1db/step ? operating voltage: 5 to 9 v ? low noise, s/n ratio>100db (a-weighting) ? high channel separation ? i 2 c bus control interface ? selectable address ? 6-channel outputs ? available in 20 pins, dip or sop applications ? av surround audio equipment ? car audio ? mini compo ? computer multi-media speaker ? other audio equipments
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 2 - july, 2005 6-channel electronic volume controller ic pt2258 block diagram in1 in2 in3 in4 in5 in6 code1 code2 out6 out5 out4 out3 out2 out1 vcc ref sda dgnd scl gnd 10db/step 10db/step 10db/step 10db/step 10db/step 10db/step ref ref ref ref control unit 1d b/ste p 1d b/ste p 1d b/ste p 1d b/ste p 1d b/ste p 1d b/ste p + - + - + - + - + - + - + -
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 3 - july, 2005 6-channel electronic volume controller ic pt2258 pin configuration in1 in2 in3 out1 out4 out2 out5 out3 out6 scl ref sda code2 code1 gnd dgnd vcc 1 20 2 19 3 18 417 813 10 11 714 9 12 6 15 5 16 pt2258 in4 in5 in6
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 4 - july, 2005 6-channel electronic volume controller ic pt2258 pin description pin name i/o description pin no. in1 i channel input no. 1. connect a capacitor to audio source 1 in2 i channel input no. 2 connect a capacitor to audio source 2 in3 i channel input no. 3 connect a capacitor to audio source 3 code2 - refer to address code section 4 dgnd - digital ground 5 scl i i 2 c clock input 6 sda i i 2 c data input 7 in4 i channel input no. 4 connect a capacitor to audio source 8 in5 i channel input no. 5 connect a capacitor to audio source 9 in6 i channel input no. 6 connect a capacitor to audio source 10 out6 o channel output no. 6 connect a capacitor to the next stage 11 out5 o channel output no. 5 connect a capacitor to the next stage 12 out4 o channel output no. 4 connect a capacitor to the next stage 13 gnd - ground 14 14 ref - reference voltage= 1/2 vcc connect a capacitor to the ground 15 vcc - power supply input 16 16 code1 - refer to the address code section 17 out3 o channel output no. 3 connect a capacitor to the next stage 18 out2 o channel output no. 2 connect a capacitor to the next stage 19 out1 o channel output no. 1 connect a capacitor to the next stage 20
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 5 - july, 2005 6-channel electronic volume controller ic pt2258 function description bus interface data are transmitted to and from the microproce ssor to the pt2258 via the sda and scl. the sda and scl make up the bus interface. it should be noted that the pull-up resistor s must be connected to the positive supply voltage. data validity a data on the sda line is considered valid and stable only when the scl signal is in high state. the high and low states of the sda line can only change when the scl signal is low. please refer to the figure below. data clk data line stable, datavalid data change a llowed start and stop conditions a start condition is activated when 1. the scl is set to high and 2. sda shifts from high to low state. the stop condition is activated when 1. scl is set to high and 2. sda shifts from low to high state. please refer to the timing diagram below. data clk start stop byte format every byte transmitted to the sda line consists of 8 bits. each byte must be followed by an acknowledge bit. the msb is transmitted first.
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 6 - july, 2005 6-channel electronic volume controller ic pt2258 acknowledge during the acknowledge clock pulse, the master (p) puts a resistive high level on the sda line. the peripheral (audio processor) that acknowledges has to pull-down (low) the sda line during the acknowledge clock pulse so that the sda line is in a stable low state during this clock pulse. please refer to the diagram below. the audio processor that has been addressed has to generate an acknowledge after receiving each byte, otherwise, the sda line will remain at the high level during the ninth (9th) clock pulse. in this case, the master transmitter can generate the stop information in order to abort the transfer. data clk start msb acknowledgment from receiver 12 3 78 9 4 transmission without acknowledge if you want to avoid the acknowledge detection of the audio processor, a simpler p transmission may be used. wait one clock and do not c heck the slave acknowledge of this same clock then send the new data. if you use this approach, there are greater c hances of faulty operation as well as decrease in noise immunity. interface protocol the interface protocol consists of the following: ? a start bit ? a chip address byte ? ack=acknowledge bit ? a data byte ? a stop bit please refer to the diagram below: start ack data ack stop msb msb first byte lsb lsb pt2258 address data transmitted (n-bytes + acknowledge) data ack 1 0 0 0 000 1 msb lsb notes: 1. ack=acknowledge 2. max. clock speed=100k bits/s
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 7 - july, 2005 6-channel electronic volume controller ic pt2258 pt2258 address code pt2258 address code depends on the state of code1 (pin no.17) and code2 (pin no.4). if code1 or code2 is connected to vcc, then code1 or code2 is set to ?1?. if code1 or code2 is connected to the ground, it is set to ?0?. please refer to the information below: condition 1: code1 code2 1 1 then, pt2258 address code is 8 ch: 1 msb 0 0 0 1 1 0 0 lsb condition 2: code1 code2 1 0 then, pt2258 address code is 88 h: 1 msb 0 0 0 1 0 0 0 lsb condition 3: code1 code2 0 1 then, pt2258 address code is 84 h: 1 msb 0 0 0 0 1 0 0 lsb condition 4: code1 code2 0 0 then, pt2258 address code is 80h: 1 msb 0 0 0 0 0 0 0 lsb
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 8 - july, 2005 6-channel electronic volume controller ic pt2258 i 2 c bus interface start time after power is turned on, pt2258 needs to wait for a shor t time in order to insure stability. the waiting time period for pt2258 to send i 2 c bus signal is at least 200ms. if t he waiting time period is less than 200ms, i 2 c control may fail. please refer to the diagram below. at least 200ms power on vdd sda/scl v 90% vdd
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 9 - july, 2005 6-channel electronic volume controller ic pt2258 pt2258 control software procedure 1. in order to ensure exact operat ion under any operating voltage, it is recommended an instruction to clear the register ?c0h? must be transmi tted first. please refer to the following diagram: start 1 0 0 0 1 0 0 0 ack11000000ack stop 2258 address clear register 2. the pt2258 function register does not have any defaul t settings. after clearing the register, an initial value must send in order to each register. if a register does has not been set, it is possible that no sound will be output. 3. when adjusting the volume of pt2258, it is necessa ry to send a multiple of 10db followed by a 1db code to the attenuator in sequence. if this sequence is not followed, or if only a 10db or 1db value is sent, the ic may not operate normall y. please refer to the diagram below: volume setting -42db j start 1 0 0 0 1 0 0 0 ack 11010100 ack 111 0 0 0 1 0 ack stop pt2258 address -40db -2db start 1 0 0 0 1 0 0 0 ack 11100010 ack 1101 0 1 0 0 ack stop pt2258 address -2db -40db the two methods above are both acceptable. warning!! the following transmission method is not permitted. send only a 10db attenuation value: start 1 0 0 0 1 0 0 0 ack11010100ack stop pt2258 address -40db send only a 10db attenuation value: start 1 0 0 0 1 0 0 0 ack11100010ack stop pt2258 address -2db do not send a 10db code without simultaneously with a 1db code or in combination with other instruction codes. start 1 0 0 0 1 0 0 0 ack 1 1 1 0 0010ack11111001ack 1 1 0 1 0 100ack stop pt2258 address -2db all ch mute -40db
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 10 - july, 2005 6-channel electronic volume controller ic pt2258 data bytes description function bits msb lsb function 1 1 1 0 a3 a2 a1 a0 6-channel, -1db/step 1 1 0 1 0 b2 b1 b0 6-channel, -10db/step 0 0 0 1 a3 a2 a1 a0 channel no. 3, -1db/step 0 0 0 0 0 b2 b1 b0 channel no. 3, -10db/step 0 0 1 1 a3 a2 a1 a0 channel no. 4, -1db/step 0 0 1 0 0 b2 b1 b0 channel no. 4, -10db/step 0 1 0 1 a3 a2 a1 a0 channel no. 2, -1db/step 0 1 0 0 0 b2 b1 b0 channel no. 2, -10db/step 0 1 1 1 a3 a2 a1 a0 channel no. 5, -1db/step 0 1 1 0 0 b2 b1 b0 channel no. 5, -10db/step 1 0 0 1 a3 a2 a1 a0 channel no. 1, -1db/step 1 0 0 0 0 b2 b1 b0 channel no. 1, -10db/step 1 0 1 1 a3 a2 a1 a0 channel no. 6, -1db/step 1 0 1 0 0 b2 b1 b0 channel no. 6, -10db/step 1 1 1 1 1 0 0 m 6-channel, mute when m= 1, mute on when m=0, mute off attenuation unit bit a3/--- a2/b2 a1/b1 a0/b0 attenuation value(db) 0 0 0 0 0/0 0 0 0 1 -1/-10 0 0 1 0 -2/-20 0 0 1 1 -3/-30 0 1 0 0 -4/-40 0 1 0 1 -5/-50 0 1 1 0 -6/-60 0 1 1 1 -7/-70 1 0 0 0 -8/- 1 0 0 1 -9/- note: ax=-1db/step, bx=-10db/step
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 11 - july, 2005 6-channel electronic volume controller ic pt2258 absolute maximum ratings parameter symbol ratings unit supply voltage vs 12 v operation temperature topr -40 +85
storage temperature tstg -65 +150
electrical characteristics (v dd =9v, v i =1vrms, f=1khz, temp=27
) parameter symbol conditions min. typ. max. unit supply voltage v dd 5 9 10 v supply current is 7 10 12 ma input impedance r in fl, fr, ctr, sub, sl, sr 22 33 42 k ? max. input voltage v cl volume=0db, thd=1% - 2.8 3.0 vrms channel separation sc 90 100 110 db volume control range crange - 79 - db max. attenuation avmax - -79 - db attenuation step astep - 1 - db attenuation error ea volume=0 -50db -1.0 0 +1.0 db mute attenuation amute a-weighting 90 95 98 db total harmonic distortion thd volume=0db, input 200mvrms 0.003 0.005 0.01 % output noise noise a-weighting - 3 5 v signal-noise ratio s/n 0db=1vrms, a-weighting 100 105 110 db output impedance ro - 600 900 ? output gain go -0.5 0 +0.5 db max. output voltage vomax fl, fr, center, sub, sl, sr thd=1% 2.3 2.5 2.8 vrms i 2 c section bus low input level v il 0 2.4 2.5 v bus high input level v ih 2.8 3.0 v dd v bus initialization t init cref=10 f - 250 300 ms
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 12 - july, 2005 6-channel electronic volume controller ic pt2258 application circuit in1 in4 out1 out4 out2 out5 out3 out6 in2 in5 in3 in6 scl ref sda code2 code1 gnd dgnd vcc vcc pt2258 address=88hex 1 20 2 19 318 4 17 813 10 11 7 14 9 12 615 5 16 + + + + + + + + + + + + + + 10 f 10 f 10 f 10 f 0.1 f 10 f 10 f 10 f 10 f 10 f 10 f 10 f 10 f 10 f 10 f 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k 100k mcu ic bus 2 dgnd agnd cref output input
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 13 - july, 2005 6-channel electronic volume controller ic pt2258 order information valid part number package type top code pt2258 20 pins, dip, 300mil pt2258 pt2258-s 20 pins, sop, 300mil pt2258-s pt2258 (l) 20 pins, dip, 300mil pt2258 pt2258-s (l) 20 pins, sop, 300mil pt2258-s notes: 1. (l), (c) or (s) = lead free 2. the lead free mark is put in front of the date code.
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 14 - july, 2005 6-channel electronic volume controller ic pt2258 package information 20 pins, dip, 300mil
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 15 - july, 2005 6-channel electronic volume controller ic pt2258 symbol min. nom. max. a - - 0.210 a1 0.015 - - a2 0.115 0.130 0.195 b 0.014 0.018 0.022 b1 0.014 0.018 0.020 b2 0.045 0.060 0.070 b3 0.030 0.039 0.045 c 0.008 0.010 0.014 c1 0.008 0.010 0.011 d 0.980 1.030 1.060 d1 0.005 - - e 0.300 0.310 0.325 e1 0.240 0.250 0.280 e - 0.100 bsc. - ea - 0.300 bsc. - eb - - 0.430 ec 0.000 - 0.060 l 0.115 0.130 0.150 notes: 1. all dimensions are in inches. 2. dimensioning and toleranc ing per ansi y14.5m-1982. 3. dimension ?a?, ?a1? and ?l? are measured with the package seated in je dec seating plane gauge gs-3 4. ?d?, ?d1? and ?e1? dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch. 5. ?e? and ?ea? measured with the leads constrained to be perpendicular to datum -c- . 6. ?eb? and ?ec? are measured at the lead tips with the leads unconstrained. 7. n is the number of the terminal positions (n=20) 8. pointed or rounded lead tips ar e preferred to ease insertion. 9. ?b2? and ?b3? maximum dimensions are not incl ude dambar protrusions. dambar protrusions shall not exceed 0.010 inch (0.25mm) 10. distance between leads including dambar protrusions to be 0.005 inch minimum. 11. datum plane -h- coincident with t he bottom of lead, where lead exits body. 12. refer to jedec ms-001, variation ad. jedec is the trademark of jedec so lid state technology association.
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 16 - july, 2005 6-channel electronic volume controller ic pt2258 20 pins, sop, 300mil symbol min. nom. max. a 2.35 - 2.65 a1 0.10 - 0.30 b 0.33 - 0.51 c 0.23 - 0.32 d 12.60 - 13.00 e 7.40 - 7.60 e - 1.27 bsc. - h 10.00 - 10.65 h 0.25 - 0.75 l 0.40 - 1.27 1 0 - 8
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2258 v1.2 - 17 - july, 2005 6-channel electronic volume controller ic pt2258 notes: 1. dimensioning and toleranc ing per ansi y14.5m-1982. 2. dimension ?d? does not include mold flash, protrusions or gate burrs. mold flash, protrusion or gate burrs shall not exceed 0.15 mm (0.006 in) per side. 3. dimension ?e? does not include interlead flash or pr otrusions. interlead flash or protrusions shall not exceed 0.25 mm (0.010 in) per side. 4. the chamfer on the body is optional. it is not presen t, a visual index feature must be located within the crosshatched area. 5. ?l? is the length of the terminal for soldering to a substrate. 6. n is the number of the terminal positions (n=20) 7. the lead width ?b? as measured 0.36 mm (0.014 in ) or greater above the seating plane, shall not exceed a maximum value of 0.61 mm (0.24 in). 8. controlling dimension: millimeter. 9. refer to jedec ms-013, variation ac. jedec is the trademark of jedec so lid state technology association.

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