1997 Dec 12

Philips Semiconductors

Product specification

32 kHz watch circuits with EEPROM

PCA16xx series

FEATURES

32 kHz oscillator, amplitude regulated with excellent
frequency stability

High immunity of the oscillator to leakage currents

Time calibration electrically programmable and
reprogrammable (via EEPROM)

A quartz crystal is the only external component required

Very low current consumption; typically 170 nA

Detector for silver-oxide or lithium battery voltage levels

Indication for battery end-of-life

Stop function for accurate timing

Power-on reset for fast testing

Various test modes for testing the mechanical parts of
the watch and the IC.

GENERAL DESCRIPTION

The PCA16xx series devices are CMOS integrated circuits
specially suited for battery-operated,
quartz-crystal-controlled wrist-watches, with bipolar
stepping motors.

ORDERING INFORMATION

Note

1. Figure 1 and Chapter "Package outline" show details of standard package, available for specified devices and 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

PCA1601U/10

chip on foil

PCA1602T

PMFP8

plastic micro flat package; 8 leads (straight)

SOT144-1

PCA1603U/7

chip with bumps on tape

PCA1604U

chip in tray

PCA1604U/10

chip on foil

PCA1605U/7

chip with bumps on tape

PCA1606U/10

chip on foil

PCA1607U

chip in tray

PCA1608U

chip in tray

PCA1611U

chip in tray

PCA1621U/7

chip with bumps on tape

PCA1621U/10

chip on foil

PCA1622U

chip in tray

PCA1623U/7

chip with bumps on tape

PCA1624U

chip in tray

PCA1625U/7

chip with bumps on tape

PCA1626U

chip in tray

PCA1627U/7

chip with bumps on tape

PCA1628U

chip in tray

PCA1629U/7

chip with bumps on tape

1997 Dec 12

Philips Semiconductors

Product specification

32 kHz watch circuits with EEPROM

PCA16xx series

PINNING

SYMBOL

PIN

DESCRIPTION

ground (0 V)

TEST

test output

OSC IN

oscillator input

OSC OUT

oscillator output

positive supply voltage

motor 1 output

motor 2 output

RESET

reset input

Fig.1 Pin configuration, PCA16xxT, (PMFP8).

PCA16xxT

VSS

TEST

OSC IN

OSC OUT

RESET

VDD

MSA973

FUNCTIONAL DESCRIPTION AND TESTING

Motor pulse

The motor pulse width (t

) and the cycle times (t

) are

given in Chapter "Available types".

Voltage level detector

The supply voltage is compared with the internal voltage
reference V

LIT

and V

EOL

every minute. The first voltage

level detection is carried out 30 ms after a RESET.

Lithium mode

If a lithium voltage is detected (V

LIT

), the circuit will

operate in the lithium mode. The motor pulse will be
produced with a 75% duty factor.

Silver-oxide mode

If the voltage level detected is between V

LIT

and V

EOL

, the

circuit will operate in silver-oxide mode.

Battery end-of-life

(1)

If the battery end-of-life is detected (V

EOL

), the

motor pulse will be produced without chopping. To indicate
this condition, bursts of 4 pulses are produced every 4 s.

Power-on reset

For correct operation of the Power-on reset the rise time of
V

from 0 V to 2.1 V should be less than 0.1 ms.

All resettable flip-flops are reset. Additionally the polarity of
the first motor pulse is positive: V

0 V.

(1) Only available for types with a 1 s motor pulse.

Customer testing

An output frequency of 32 Hz is provided at RESET (pin 8)
to be used for exact frequency measurement. Every
minute a jitter occurs as a result of time calibration, which
occurs 90 to 150 ms after disconnecting the RESET from
V

Connecting the RESET to V

stops the motor pulses

leaving them in a HIGH impedance 3-state condition and a
32 Hz signal without jitter is produced at the TEST pin.
A debounce circuit protects accidental stoppages due to
mechanical shock to the watch (t

DEB

= 14.7 to 123.2 ms).

Connecting RESET to V

activates Tests 1 and 2 and

disables the time calibration.

Test 1, V

> V

EOL

. Normal function takes place except

the voltage detection cycle (t

) is 125 ms and the cycle

time t

is 31.25 ms. At pin TEST a minute signal is

available at 8192 times its normal frequency.

Test 2

(2)

, V

< V

EOL

. The voltage detection cycle (t

) is

31.25 ms and the motor pulse period (t

) = 31.25 ms.

Test and reset mode are terminated by disconnecting the
RESET pin.

Test 3, V

> 5.1 V. Motor pulses with a time period of

= 31.25 ms and n

122

s are produced to check the

contents of the EEPROM. At pin TEST the motor pulse
period signal (t

) is available at 1024 times its normal

frequency. The circuit returns to normal operation when
V

< 2.5 V between two motor pulses.

(2) Only applicable for types with the battery end-of-life detector.

1997 Dec 12

Philips Semiconductors

Product specification

32 kHz watch circuits with EEPROM

PCA16xx series

Time calibration

Taking a normal quartz crystal with frequency 32768kHz,
frequency deviation (

f/f) of

and C

= 8.2 pF;

the oscillator frequency is offset (by using non-symmetrical
internal oscillator input and output capacitances of 10 pF
and 15 pF) such that the frequency deviation is
positive-only. This positive deviation can then be
compensated for to maintain time-keeping accuracy.

Once the positive frequency deviation is measured, a
corresponding number `n' (see Table 1) is programmed
into the device's EEPROM. This causes n pulses of
frequency 8192 Hz to be inhibited every minute of
operation, which achieves the required calibration.

The programming circuit is shown in Fig.2. The required
number n is programmed into EEPROM by varying V

according to the steps shown in Fig.3, which are
explained below:

1. The positive quartz frequency deviation (

f/f) is

measured, and the corresponding values of n are
found according to Table 1.

2. V

is increased to 5.1 V allowing the contents of the

EEPROM to be checked from the motor pulse period
t

at nominal frequency.

3. V

is decreased to 2.5 V during a motor pulse to

initialize a storing sequence.

4. The first V

pulse to 5.1 V erases the contents of

EEPROM.

5. When the EEPROM is erased a logic 1 is at the TEST

pin.

6. V

is increased to 5.1 V to read the data by pulsing

n times to 4.5 V. After the n edge, V

decreased to 2.5 V.

7. V

is increased to 5.1 V to store n bits in the

EEPROM.

8. V

is decreased to 2.5 V to terminate the storing

sequence and to return to operating mode.

9. V

is increased to 5.1 V to check writing from the

motor pulse period t

10. V

is decreased to the operation voltage between

two motor pulses to return to operating mode.
(Decreasing V

during the motor pulse would restart

the programming mode).

The time calibration can be reprogrammed up to 100
times.

Table 1

Quartz crystal frequency deviation, n and t

Notes

1. Increments of 2.03

/step.

2. Increments of 122

s/step.

FREQUENCY

DEVIATION

f/f

(

)

NUMBER OF

PULSES

(n)

(ms)

(1)

31.250

(2)

+2.03

31.372

+4.06

31.494

+127.89

38.936

Fig.2 Circuit for programming the time calibration.

MSA975

VDD

RESET

VSS

TEST

OSC IN

OSC OUT

PCA16xx

SERIES

32 kHz

SIGNAL GENERATOR

1997 Dec 12

Philips Semiconductors

Product specification

32 kHz watch circuits with EEPROM

PCA16xx series

AVAILABLE TYPES

Refer to Fig.4 and to Chapters "Ordering information" and "Functional description and testing".

Note

1. U = Chip in trays; U/7 = chip with bumps on tape; U/10 = chip on foil.

T = SOT144-1.

SHORT

TYPE

NUMBER

DELIVERY

FORMAT

(1)

PERIOD

(s)

SPECIFICATIONS

PULSE

WIDTH t

(ms)

DRIVE

(%)

EEPROM

BATTERY

EOL

DETECTION

REMARKS

1601

U/10

7.8

100

yes

1602

7.8

yes

1603

U/7

7.8

100

yes

1604

U/10

7.8

yes

1605

U/7

4.8

yes

1606

U/10

6.8

100

yes

1607

5.8

100

yes

1.5 V and
2.1 V Lithium

1608

7.8

100

yes

1.5 V and
2.1 V Lithium

1611

6.8

yes

1621

U/7

4.8

100

yes

1622

4.8

100

yes

1623

4.8

yes

1624

3.9

75
56

yes

1.5 V and
2.1 V Lithium

1625

U/7

5.8

yes

1626

5.8

100

yes

1627

U/7

5.8

100

yes

1.5 V and
2.1 V Lithium

1628

5.8

yes

1629

U/7

6.8

yes

Fig.4 Motor output waveform (normal operation).

MSA977

VM1 - M2

2t T

t T

t P

1997 Dec 12

Philips Semiconductors

Product specification

32 kHz watch circuits with EEPROM

PCA16xx series

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC134).

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

= 1.55 V; V

= 0 V; f

osc

= 32.768 kHz; T

amb

= 25

C; crystal: R

= 20 k

; C

= 2 to 3 fF; C

= 8 to 10 pF;

= 1 to 3 pF; unless otherwise specified.

Immunity against parasitic impedance = 20 M

from one pin to an adjacent pin.

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

supply voltage

= 0 V; note 1

1.8

all input voltages

output short-circuit duration

indefinite

amb

operating ambient temperature

+60

stg

storage temperature

+100

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Supply

supply voltage

amb

10 to +60

1.2

1.5

2.5

supply voltage variation

transient; V

= 1.2 to 2.5 V

0.25

DDP

supply voltage pulse

programming

5.0

5.1

5.2

DDP

supply voltage pulse variation

programming

0.55

0.6

0.65

DD1

supply current

between motor pulses

170

260

DD2

supply current

between motor pulses;
V

= 2.1 V

190

300

DD3

supply current

stop mode; pin 8 connected to
V

180

280

DD4

supply current

stop mode; pin 8 connected to
V

; V

= 2.1 V

220

360

DD5

supply current

= 2.1 V;

amb

10 to +60

600

1997 Dec 12

Philips Semiconductors

Product specification

32 kHz watch circuits with EEPROM

PCA16xx series

Notes

1. Cycle time can be changed to one of the following values: 1, 5, 10, 12 or 20 s (see Chapter "Available types").

2. Pulse width can be varied from 2 ms to 15.7 ms in steps of 1 ms (see Chapter "Available types").

3. Duty factor is 1 : 32 and RESET = V

or V

Motor output

sat

saturation voltage

(P + N)

= 2 k

; T

amb

10 to +60

150

200

short-circuit resistance

(P + N)

transistor

< 1 mA

200

300

cycle time

note 1

pulse width

note 2

Oscillator

OSC ST

starting voltage

1.2

transconductance

i(p-p)

50 mV

osc

start-up time

f/f

frequency stability

= 100 mV

0.05

0.3

input capacitance

output capacitance

Voltage level detector

LIT

threshold voltage

lithium mode

1.65

1.80

1.95

EOL

threshold voltage

battery end-of-life

1.27

1.38

1.46

VLD

hysteresis of threshold

VLD

temperature coefficient

mV/K

voltage detection cycle

Reset input

output frequency

output voltage swing

R = 1 M

; C = 10 pF

1.4

edge

edge time

R = 1 M

; C = 10 pF

peak input current

note 3

320

i(av)

average input current

Test mode

cycle time for motor pulses in:

test 1

125

test 2

31.25

test 3

see Chapter "Available types"

DEB

debounce time

RESET = V

14.7

123.2

Battery end-of-life

EOL

end-of-life sequence

motor pulse width

see "Available types"

time between pulses

31.25

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

1997 Dec 12

Philips Semiconductors

Product specification

32 kHz watch circuits with EEPROM

PCA16xx series

SOLDERING

Introduction

There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.

This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our

"IC Package Databook" (order code 9398 652 90011).

Reflow soldering

Reflow soldering techniques are suitable for all SO
packages.

Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.

Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
method. Typical reflow temperatures range from
215 to 250

Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 minutes at
45

Wave soldering

Wave soldering techniques can be used for all SO
packages if the following conditions are observed:

A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave) soldering
technique should be used.

The longitudinal axis of the package footprint must be
parallel to the solder flow.

The package footprint must incorporate solder thieves at
the downstream end.

During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.

Maximum permissible solder temperature is 260

C, and

maximum duration of package immersion in solder is
10 seconds, if cooled to less than 150

C within

6 seconds. Typical dwell time is 4 seconds at 250

A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.

Repairing soldered joints

Fix the component by first soldering two diagonally-
opposite end leads. Use only a low voltage soldering iron
(less than 24 V) applied to the flat part of the lead. Contact
time must be limited to 10 seconds at up to 300

C. When

using a dedicated tool, all other leads can be soldered in
one operation within 2 to 5 seconds between
270 and 320

1997 Dec 12

Philips Semiconductors

Product specification

32 kHz watch circuits with EEPROM

PCA16xx series

DEFINITIONS

LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.

Data sheet status

Objective specification

This data sheet contains target or goal specifications for product development.

Preliminary specification

This data sheet contains preliminary data; supplementary data may be published later.

Product specification

This data sheet contains final product specifications.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information

Where application information is given, it is advisory and does not form part of the specification.

Internet: http://www.semiconductors.philips.com

Philips Semiconductors a worldwide company

SCA54

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Printed in The Netherlands

417087/1200/03/pp16

Date of release: 1997 Dec 12

Document order number:

9397 750 03142

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: PCA1606

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: PCA1606