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E1466D
32-kHz Clock CMOS IC with Digital Trimming
Features
D 32-kHz crystal oscillator D 1.1 V to 2.2 V operating-voltage range D Integrated capacitors for digital trimming D Suitable for up to 12.5 pF quartz D Output pulse formers D Mask options for motor period and pulse width D Low resistance output for bipolar stepping motor D Motor fast-test function
Pad Configuration
C4 C3 C2 C1 V *) DD V SS OSCIN OSCOUT *)
General Description
The E1466D is an integrated circuit in CMOS Silicon Gate Technology for analog clocks. It consists of a 32 kHz oscillator, frequency divider, output pulse formers and push-pull motor drivers. Integrated capacitors are mask-selectable to accomodate the external quartz crystal. Additional capacitance can be selected through pad bonding for trimming the oscillator frequency.
E1466D
TEST **) MOT1 **) MOT2 MOT1
) The pads VDD and OSCOUT are interchangeable per mask option *) The pads TEST and MOT1 are interchangeable per mask option
9611882
Figure 1. Pad configuration
Absolute Maximum Ratings
Parameters Supply voltage Input voltage range, all inputs Output short circuit duration Power dissipation (DIL package) Operating ambient temperature range Storage temperature range Lead temperature during soldering at 2 mm distance, 10 seconds Symbol VSS VIN Ptot Tamb Tstg Tsld Value -0.3 to 5 V (VSS - 0.3V) xVIN x (VDD + 0.3 V) indefinite 125 -20 to +70 -40 to +125 260 Unit V V mW C C C
Absolute maximum ratings define parameter limits which, if exceeded, may permanently change or damage the device. All inputs and outputs on Atmel Wireless & Microcontrollers' circuits are protected against
electrostatic discharges. However, precautions to minimize the build-up of electrostatic charges during handling are recommended. The circuit is protected against supply voltage reversal for typically 5 minutes.
Rev. A2, 15-Jan-01
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E1466D
Functional Description
Oscillator
An oscillator inverter with feedback resistor is provided for generation of the 32768 Hz clock frequency. Values for the fixed capacitors at OSCIN and OSCOUT are mask-selectable (see note 3 of operating characteristics). Four capacitor pads, C1 to C4 enable the addition of integrated trimming capacitors to OSCIN, providing 15 tuning steps. is obtained by bonding the capacitor pads to OSCIN. As none of these pads are bonded, the IC is in an untrimmed state. Figure 3 shows the trimming curve characteristic. Note: For applications which utilize this integrated trimming feature, Atmel Wireless & Microcontrollers will determine optimum values for the integrated capacitors COSCIN and COSCOUT. Capacitor pads C1 to C4: 0 = open, 1 = connected to OSCIN. Combination C1 + C4 is redundant and therefore eliminated from the list. Trimming Step g p C2 0 0 1 0 0 1 0 1 1 0 1 1 0 1 1 C1 0 1 0 0 0 1 1 0 0 0 1 1 1 0 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Trimming Capacitors
A frequency variation of typ. 4 ppm for each tuning step Capacitor Pads C4 0 0 0 0 1 0 0 0 1 1 0 1 1 1 1 C3 0 0 0 1 0 0 1 1 0 1 1 0 1 1 1
Motor Drive Output
The E1466D contains two push-pull output buffers for driving bipolar stepping motors. During a motor pulse, the n-channel device of one buffer and the p-channel device of the other buffer will be activated. Both n-channel transistors are on and conducting between output pulses. The outputs are protected against inductive voltage spikes with diodes to both supply pins. The motor output period and pulse width are mask-programmable, as listed below: Available motor periods (TM): 125, 250, 500 ms and 2, 16 s Available max. pulse widths (tM): 15, 6, 23.4, 31.25, 46.9 ms and 1 s Available motor periods for motor test (TMT): 250, 500 ms and 1 s
Note: The following constraints for combination of motor period and pulse widths have to be considered: TM u 4 * tM, TMT u 4 * tM or alternatively TM = 2 * tM, TMT = 2 * tM
Test Functions
For test purposes, the TEST pad is open. With a high resistance probe (R w 10 MW, C w 20 pF), a test frequency fTEST of 128 Hz can be measured at the TEST pad. Connecting TEST (for at least 32 ms) to VDD changes the motor period from the selected value to TMT (mask-selectable) while the pulse width remains unaffected. This feature can be used for testing the mechanical parts of the clock.
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E1466D
Operating Characteristics
VSS = 0 V, VDD = 1.5 V, Tamb = +25C, unless otherwise specified All voltage levels are measured with reference to VSS. Test crystal as specified below. Parameters Operating voltage Operating temperature Operating current Motor drive output Motor output current Motor period Motor period during motor test Motor pulse width Oscillator Startup voltage Frequency stability Integrated input capacitance Integrated output capacitance Integrated capacitance for bond option TEST input Input current Input current Input debounce delay Note 1: Note 2: Note 3: Note 4:
V DD
Test Conditions / Pins
R1 = , note 2 VDD = 1.2 V, R1 = 200 W
Symbol VDD Tamb IDD IM TM TMT tM
Min. 1.1 -20
Typ. 1.5 2
Max. 2.2 +70 5
Unit V C mA mA
"4.3 See option list See option list See option list 1.2 1 See option list See option list 3 4 5 6 0.6 -0.6 23.4 3 -3 10 -10 31.2 2.2
Within 2 s DVDD = 100 mV, VDD = 1.1 to 2.2 V Note 3 Note 4 Note 4 Note 4 Note 4 TEST = VDD peak current TEST = VSS peak current
VSTART Df/f COSCIN COSCOUT C1 C2 C3 C4 ITINH ITINL tTIN
V ppm
pF pF pF pF mA mA ms
Typical parameters represent the statistical mean values See test circuit Values can be selected in 1 pF steps. A total capacitance (COSCIN + COSCOUT) of 38 pF is available These values are valid for 10 pF quartz applications. For CL = 12.5 pF these values change to 4.5, 6, 7.5, 9 pF
C4 C3 C2 C1 OSCIN
Test Crystal Specification
Oscillation frequency Series resistance Static capacitance Dynamic capacitance Load capacitance fOSC = 32768 Hz RS = 30 kW C0 = 1.5 pF C1 = 3.0 fF CL optionally 10 or 12.5 pF
V SS
OSCOUT
E1466D
TEST MOT2
R1
MOT1
MOT1
9611883
Figure 1. Functional test
Rev. A2, 15-Jan-01
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E1466D
Detail a TEST MOT1 tM MOT2 TM T MT VDD VSS VDD VSS VDD VSS
Detail a: 1/f TEST
9611884
Figure 2. Motor output signal during normal operation and during motor test
2.00006 2.00005 2.00004 2.00003 2.00002 Motorperiod (s) 2.00001 2.00000 1.99999 1.99998 1.99997 1.99996 1.99995 1.99994 1.99993 1.99992 1.99991 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
9611885
COX = 1.05 1.00 0.95
Trimming step
Figure 3. Typical trimming curve characteristic for TM of 2 s
COX means frequency deviation due to production process variations. Trimming inputs C1 ... C4 are binary weighted, i.e., C1 ... C4 = 0 corresponds to trimming step 0 C1 ... C4 = 1 corresponds to trimming step 15
LSB = C1
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E1466D
Ordering Information
Table 3 Option list E1466Dx
Option Cycle (TM) s Motor Pulse (tM) ms Test (TMT) ms COSCIN *) pF COSCOUT *) pF Integrated Capacitance C1 pF C2 pF C3 pF C4 pF pF Load Cap.
x
A AO FO HO
2 2 0.25 2
46.9 46.9 62.5 1000
250 250 2000 500/ 250
9 9 9 9
20 20 20 20
3 3 3 3
4 4 4 4
5 5 5 5
6 6 6 6
10 10 10 10
*) on-chip stray capacitance included
Option x Pad 1 Pad 2 Pad 3 Pad 4 Pad 5 Pad Designation Pad 6 Pad 7 Pad 8 Pad 8 Pad 10 Pad 11 Pad 12
A AO FO HO
OSCIN OSCIN OSCIN OSCIN
OSCOUT OSCOUT OSCOUT OSCOUT
MOT2 MOT2 MOT2 MOT2
MOT1 MOT1 MOT1 MOT1
MOT1 MOT1 MOT1 MOT1
TEST TEST TEST TEST
VSS VSS VSS VSS
VDD VDD VDD VDD
C4 C4 C4 C4
C3 C3 C3 C3
C2 C2 C2 C2
C1 C1 C1 C1
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. Data sheets can also be retrieved from the Internet: http://www.atmel-wm.com
Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423
Rev. A2, 15-Jan-01
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