H1137WW27 datasheet(4/6 Pages) EMMICRO

Part #	H1137WW27

Description	CMOS circuit for Analog Quartz Watches

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Manufacturer	EMMICRO [EM Microelectronic - MARIN SA]

Direct Link	http://www.emmicroelectronic.com

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H1137

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Block Diagram

O s c illator

In itia l D iv id e r

Pu ls e W id th

D iv ider

Div id e r 1 H z

P u ls e R e p e titio n

Div id e r

M o to r Log ic

M a ste r R e se t

Mo to r D riv e r

Test Lo gic

OS C

IN

OS C

OU T

TE S T

M O T

1

MO T

2

RE SET

Fig. 4

Pin Assignments

Name

Function

VN

VP

OSCIN

OSCOUT

MOT1

MOT2

RESET

TEST

Negative supply voltage

Positive supply voltage

Oscillator input

Oscillator output

Motor drive output 1

Motor drive output 2

Reset input

Test input / output

Functional Description

Oscillator

The 32’768Hz clock frequency is generated by a crystal

oscillator. Input and output capacitors are integrated in

the chip. Their values are metal mask selectable.

Motor drive output

The H1137 contains two push-pull output buffers for driv-

ing bipolar stepping motors (see Fig. 3). Between two

pulses, the two p-channel devices are active for motor

damping.

Reset

Pulling the RESET input to VP resets the frequency di-

viders and disables the motor pulses. Motor pulses in

progress when the RESET function is applied, will be

completed. After releasing the RESET pad from VP, the

next motor pulse appears with a delay of one half motor

cycle on the drive output MOT1 if the last motor pulse

appeared on MOT2 or vice-versa (see Fig. 3). Due to the

debounce circuitry on the RESET input, VP must be ap-

plied for at least 23.4 ms to be accepted as RESET.

Test mode

The TEST pad fulfils two functions:

a) For normal operation, the TEST pad is left open. The

circuit outputs a square wave signal of 512Hz which

can be used for tuning the oscillator.

b) If the TEST pad is connected to VP, the period for

the motor pulses changes to either 2 x 31.25 ms or

2 x 62.5 ms (mask options), while the motor pulse

width remains unchanged (fast motor test).

Test

Test Pad

Function

Description

Connected to

VP

Open

Fast motor

test

Normal

operation

Increase the frequency for the

motor pulses to 16Hz (32Hz)

Output of square wave signal

(512Hz)

Test configuration

Operating range of Trimmer Capacitance:

3pF

≤ CTR ≤ 30 pF

RL

Reset

CTR

VN

VP

Test

Fig. 5

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