PCA167x series
INTEGRATED CIRCUITS
DATA SHEET
PCA167x series
32 kHz watch circuits using a silver-oxide or a 3 V lithium battery
Product specification |
1998 Apr 03 |
Supersedes data of 1997 Apr 22
File under Integrated Circuits, IC16
Philips Semiconductors |
Product specification |
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32 kHz watch circuits using a silver-oxide
PCA167x series
or a 3 V lithium battery
FEATURES
∙32 kHz oscillator, amplitude regulated with excellent frequency stability
∙High immunity of the oscillator to leakage currents
∙Very low current consumption; typically 150 nA
∙Stop function for accurate timing
∙Chopped motor pulses available
∙Power-on reset for fast testing
∙Various test modes for testing the mechanical parts of the watch and the IC.
ORDERING INFORMATION
GENERAL DESCRIPTION
The PCA167x series devices are CMOS integrated circuits specially suited for battery-operated, quartz-crystal-controlled wrist-watches, with a bipolar stepping motor.
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PACKAGE(1) |
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NUMBER |
NAME |
DESCRIPTION |
VERSION |
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PCA1672U |
− |
chip in tray |
− |
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PCA1673U |
− |
chip in tray |
− |
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PCA1675U |
− |
chip in tray |
− |
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PCA1676U/10 |
− |
chip on foil |
− |
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PCA1677U |
− |
chip in tray |
− |
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Note
1.Figure 1 and Chapter “Package outline” show details of standard package, available for large orders only. Chapter “Chip dimensions and bonding pad locations” shows exact pad locations for other delivery formats.
PINNING
SYMBOL |
PIN |
DESCRIPTION |
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VSS |
1 |
ground (0 V) |
TEST |
2 |
test output |
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OSC IN |
3 |
oscillator input |
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OSC OUT |
4 |
oscillator output |
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VDD |
5 |
positive supply voltage |
M1 |
6 |
motor 1 output |
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M2 |
7 |
motor 2 output |
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RESET |
8 |
reset input |
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VSS |
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1 |
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8 |
RESET |
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TEST |
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M2 |
2 |
PCA167xT |
7 |
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OSC IN |
3 |
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6 |
M1 |
OSC OUT |
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VDD |
4 |
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5 |
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MSA978 |
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Fig.1 Pin configuration, PCA167xT, (PMFP8).
1998 Apr 03 |
2 |
Philips Semiconductors |
Product specification |
|
|
32 kHz watch circuits using a silver-oxide
PCA167x series
or a 3 V lithium battery
FUNCTIONAL DESCRIPTION AND TESTING
Motor pulse
The motor output pulse widths (tP) and the cycle times (tT) are given in Chapter “Available types”.
Power-on reset
For correct operation of the Power-on reset the rise time of VDD from 0 V to 1.55 V should be less than 0.1 ms.
All resettable flip-flops are reset. Additionally the polarity of the first motor pulse is positive: VM1 - VM2 ³ 0 V.
AVAILABLE TYPES
Customer testing and stop mode
An output frequency of 32 Hz is provided at RESET (pin 8) to be used for exact frequency measurement.
Connecting the RESET to VDD stops the motor pulses leaving them in a HIGH impedance 3-state condition and a 32 Hz signal is produced at the TEST pin. A debounce circuit protects against accidental stoppages due to mechanical shock to the watch (tDEB = 14.7 to 123.2 ms).
Connecting RESET to VSS activates the test mode.
The motor pulse period is 31.25 ms instead of tT. Test and stop mode are disabled by disconnecting RESET (open-circuit).
Refer to Fig.2 and to Chapters “Ordering information” and “Functional description and testing”.
SHORT |
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PERIOD |
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SPECIFICATIONS |
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DELIVERY |
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PULSE |
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BATTERY |
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TYPE |
tT |
DRIVE |
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FORMAT(1) |
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WIDTH tP |
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EEPROM |
EOL |
REMARKS |
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NUMBER |
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(%) |
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(ms) |
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DETECTION |
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1672 |
U |
1 |
7.8 |
56 |
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no |
no |
3 V Lithium |
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1673 |
U |
1 |
5.8 |
56 |
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no |
no |
3 V Lithium |
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1675 |
U |
1/16 |
5.8 |
100 |
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no |
no |
no oscillator |
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1676 |
U/10 |
10 |
5.8 |
56 |
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no |
no |
3 V Lithium |
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1677 |
U |
10 |
7.8 |
100 |
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no |
no |
1.5 V |
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Note
1. U = Chip in trays; U/10 = chip on foil.
VM1 - M2
t T |
t P |
2t T |
MSA977 |
Fig.2 Motor output waveform (normal operation).
1998 Apr 03 |
3 |
Philips Semiconductors |
Product specification |
|
|
32 kHz watch circuits using a silver-oxide
PCA167x series
or a 3 V lithium battery
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL |
PARAMETER |
CONDITIONS |
MIN. |
MAX. |
UNIT |
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VDD |
supply voltage |
VSS = 0 V; note 1 |
−1.8 |
+6 |
V |
VI |
all input voltages |
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VSS |
VDD |
V |
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output short-circuit duration |
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indefinite |
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Tamb |
operating ambient temperature |
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−10 |
+60 |
°C |
Tstg |
storage temperature |
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−30 |
+100 |
°C |
Note
1.Connecting the battery with reversed polarity does not destroy the circuit, but in this condition a large current flows, which will rapidly discharge the battery.
HANDLING
Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is advisable to take handling precautions appropriate to handling MOS devices. Advice can be found in
“Data Handbook IC16, General, Handling MOS Devices”.
CHARACTERISTICS
VDD = 1.55 V; VSS = 0 V; fosc = 32.768 kHz; Tamb = 25 °C; crystal: RS = 20 kΩ; C1 = 2 to 3 fF; CL = 8 to 10 pF; C0 = 1 to 3 pF; unless otherwise specified.
SYMBOL |
PARAMETER |
CONDITIONS |
MIN. |
TYP. |
MAX. |
UNIT |
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Supply |
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VDD |
supply voltage |
Tamb = −10 to +60 °C |
1.2 |
1.5 |
3.5 |
V |
VDD |
supply voltage variation |
transient; |
− |
− |
0.25 |
V |
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VDD = 1.2 to 3.5 V |
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IDD1 |
supply current |
between motor pulses |
− |
150 |
250 |
nA |
IDD2 |
supply current |
between motor pulses; |
− |
200 |
350 |
nA |
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VDD = 3.5 V |
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IDD3 |
supply current |
stop mode; pin 8 |
− |
180 |
300 |
nA |
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connected to VDD |
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IDD4 |
supply current |
stop mode; pin 8 |
− |
300 |
480 |
nA |
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connected to VDD; |
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VDD = 3.5 V |
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1998 Apr 03 |
4 |