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

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

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.

TYPE		PACKAGE(1)
NUMBER	NAME	DESCRIPTION	VERSION
PCA1672U	−	chip in tray	−
PCA1673U	−	chip in tray	−
PCA1675U	−	chip in tray	−
PCA1676U/10	−	chip on foil	−
PCA1677U	−	chip in tray	−

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
VSS	1	ground (0 V)
TEST	2	test output
OSC IN	3	oscillator input
OSC OUT	4	oscillator output
VDD	5	positive supply voltage
M1	6	motor 1 output
M2	7	motor 2 output
RESET	8	reset input

VSS
	1		8	RESET
TEST				M2
	2	PCA167xT	7
OSC IN	3		6	M1
OSC OUT				VDD
	4		5
		MSA978

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		PERIOD			SPECIFICATIONS
	DELIVERY
			PULSE				BATTERY
TYPE		tT		DRIVE
	FORMAT(1)
			WIDTH tP			EEPROM	EOL	REMARKS
NUMBER		(s)
				(%)
			(ms)				DETECTION
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

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
VDD	supply voltage	VSS = 0 V; note 1	−1.8	+6	V
VI	all input voltages		VSS	VDD	V
	output short-circuit duration			indefinite
Tamb	operating ambient temperature		−10	+60	°C
Tstg	storage temperature		−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
Supply
VDD	supply voltage	Tamb = −10 to +60 °C	1.2	1.5	3.5	V
VDD	supply voltage variation	transient;	−	−	0.25	V
		VDD = 1.2 to 3.5 V
IDD1	supply current	between motor pulses	−	150	250	nA
IDD2	supply current	between motor pulses;	−	200	350	nA
		VDD = 3.5 V
IDD3	supply current	stop mode; pin 8	−	180	300	nA
		connected to VDD
IDD4	supply current	stop mode; pin 8	−	300	480	nA
		connected to VDD;
		VDD = 3.5 V

1998 Apr 03

4