R
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.
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
Application
Analog watches
Functional Diagram
CROWN
V
N
V
N
RESET
V
P
Pin Assignment
8
10
7
6
5
H1137
2
3
4
V
P
MOT
1
C
TR
H1137
OSC
IN
MOT
2
RL
(Stepping Motor)
1
OSC
OUT
V
P
V
P
Operating range of Trimmer Capacitance:
3pF
≤
C
TR
≤
30 pF
Pad
V
N
V
P
OSC
IN
OSC
OUT
MOT
1
MOT
2
RESET
TEST
Fig. 1
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
1
www.emmicroelectronic.com
EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
