H1137 Datasheet, PDF (1/6 Pages) EM Microelectronic - MARIN SA – CMOS circuit for Analog Quartz Watches

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EM MICROELECTRONIC - MARIN SA
H1137
CMOS circuit for Analog Quartz Watches
Description
The H1137 is a low power 32kHz analog watch chip de-
signed to drive a stepping motor. Motor pulse width is
programmable from 0.9765 to 14.65 milliseconds in steps
of 0.9765 milliseconds. Motor pulse period is program-
mable from 2 x 1 to 2 x 60 seconds in steps of 1 second.
Motor pulse period is also programmable from 2 x 0.25 to
2 x 15.75 seconds in steps of 0.25 seconds. Input and
output capacitors are integrated on the chip. Their values
are metal mask selectable. The selection of width, period
and capacitance are metal options and do not require
additional bonds.
Application
‰ Analog watches
Features
‰ 32Hz quartz oscillator
‰ Operating voltage range – 1.2V to –1.8V
‰ High oscillator stability
‰ Integrated capacitors, mask selectable
‰ Mask options for pad designation, motor period and
motor pulse width
‰ Shorted motor coil between motor pulses
‰ Fast motor test function
‰ ESD protected terminals
‰ 512Hz output on TEST pad for quartz frequency
measurement
‰ Fully debounced TEST input and RESET input
Functional Diagram
CROWN
V_N
V_N
RESET
V_P
V_P
C_TR
MOT₁
H1137
OSC_IN
MOT₂
RL
(Stepping Motor)
OSC_OUT
V_P
Operating range of Trimmer Capacitance:
3pF ≤ C_TR ≤ 30 pF
V_P
Fig. 1
Pin Assignment
8
7
6
5
10 _H1137
12
34
Pad
V_N
V_P
OSC_IN
OSC_OUT
MOT₁
MOT₂
RESET
TEST
Function
Negative supply voltage
Positive supply voltage
Oscillator input
Oscillator output
Motor drive output 1
Motor drive output 2
Reset input
Test input/output
Pad location
1
5
3
4
7
6
2 or 8
2 or 8 or 10
Fig. 2
Copyright © 2004, EM Microelectronic-Marin SA
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