Philips PCA1673U, PCA1673U-10, PCA1673U-10-F2, PCA1673U-F2, PCA1675U Datasheet

DATA SH EET

Product specification
Supersedes data of 1997 Apr 22
File under Integrated Circuits, IC16

1998 Apr 03

INTEGRATED CIRCUITS

PCA167x series

32 kHz watch circuits using a
silver-oxide or a 3 V lithium battery

1998 Apr 03 2

Philips Semiconductors Product specification

32 kHz watch circuits using a silver-oxide
or a 3 V lithium battery

PCA167x series

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.

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.

ORDERING INFORMATION

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.

TYPE

NUMBER

PACKAGE

(1)

NAME DESCRIPTION VERSION

PCA1672U − chip in tray −
PCA1673U − chip in tray −
PCA1675U − chip in tray −
PCA1676U/10 − chip on foil −
PCA1677U − chip in tray −

PINNING

SYMBOL PIN DESCRIPTION

V

SS

1 ground (0 V)
TEST 2 test output
OSC IN 3 oscillator input
OSC OUT 4 oscillator output
V

DD

5 positive supply voltage
M1 6 motor 1 output
M2 7 motor 2 output
RESET 8 reset input

Fig.1 Pin configuration, PCA167xT, (PMFP8).

1
2
3
4

8
7
6
5

PCA167xT

V

SS

TEST

OSC IN

OSC OUT

RESET
M2
M1

V

DD

MSA978

1998 Apr 03 3

Philips Semiconductors Product specification

32 kHz watch circuits using a silver-oxide
or a 3 V lithium battery

PCA167x series

FUNCTIONAL DESCRIPTION AND TESTING
Motor pulse

The motor output pulse widths (t

P

) 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
V

DD

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≥ 0V.

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 V

DD

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 (t

DEB

= 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).

AVAILABLE TYPES

Refer to Fig.2 and to Chapters “Ordering information” and “Functional description and testing”.

Note

1. U = Chip in trays; U/10 = chip on foil.

SHORT

TYPE

NUMBER

DELIVERY

FORMAT

(1)

PERIOD

t

T

(s)

SPECIFICATIONS

PULSE

WIDTH t

P

(ms)

DRIVE

(%)

EEPROM

BATTERY

EOL

DETECTION

REMARKS

1672 U 1 7.8 56 no no 3 V Lithium
1673 U 1 5.8 56 no no 3 V Lithium
1675 U 1/16 5.8 100 no no no oscillator
1676 U/10 10 5.8 56 no no 3 V Lithium
1677 U 10 7.8 100 no no 1.5 V

Fig.2 Motor output waveform (normal operation).

MSA977

V

M1 - M2

2t

T

t

T

t

P

1998 Apr 03 4

Philips Semiconductors Product specification

32 kHz watch circuits using a silver-oxide
or a 3 V lithium battery

PCA167x series

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

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

V

DD

= 1.55 V; VSS=0V; f

osc

= 32.768 kHz; T

amb

=25°C; crystal: RS=20kΩ; C1= 2 to 3 fF; CL= 8 to 10 pF;

C

0

= 1 to 3 pF; unless otherwise specified.

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

DD

supply voltage VSS= 0 V; note 1 −1.8 +6 V

V

I

all input voltages V

SS

V

DD

V

output short-circuit duration indefinite

T

amb

operating ambient temperature −10 +60 °C

T

stg

storage temperature −30 +100 °C

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

DD

supply voltage T

amb

= −10 to +60 °C 1.2 1.5 3.5 V

∆V

DD

supply voltage variation transient;

VDD= 1.2 to 3.5 V

−− 0.25 V

I

DD1

supply current between motor pulses − 150 250 nA

I

DD2

supply current between motor pulses;

VDD= 3.5 V

− 200 350 nA

I

DD3

supply current stop mode; pin 8

connected to V

DD

− 180 300 nA

I

DD4

supply current stop mode; pin 8

connected to VDD;
VDD= 3.5 V

− 300 480 nA