H1137 EMMICRO [EM Microelectronic - MARIN SA], H1137 Datasheet - Page 4

• Manufacturer Part Number: H1137
• Description: CMOS circuit for Analog Quartz Watches
• Manufacturer: EMMICRO [EM Microelectronic - MARIN SA]

Block Diagram
Pin Assignments
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 V
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 V
next motor pulse appears with a delay of one half motor
cycle on the drive output MOT
appeared on MOT
debounce circuitry on the RESET input, V
plied for at least 23.4 ms to be accepted as RESET.
Copyright © 2004, EM Microelectronic-Marin SA
Name
V
V
OSC
OSC
MOT
MOT
RESET
TEST
O S C
N
P
IN
OUT
1
2
O s c illa to r
IN
Function
Negative supply voltage
Positive supply voltage
Oscillator input
Oscillator output
Motor drive output 1
Motor drive output 2
Reset input
Test input / output
R
O S C
2
or vice-versa (see Fig. 3). Due to the
O U T
T e s t L o g ic
T E S T
P
1
resets the frequency di-
if the last motor pulse
In itia l D iv id e r
P
must be ap-
P
, the
M O T
M o to r D r iv e r
M o to r L o g ic
1
4
Test mode
The TEST pad fulfils two functions:
a)
b)
Test
Test configuration
Test Pad
Connected to
V
Open
P
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.
If the TEST pad is connected to V
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).
P u ls e W id th
M O T
D iv id e r
Reset
Operating range of Trimmer Capacitance:
3pF ≤ C
2
Function
Fast motor
test
Normal
operation
V
V
TR
P
N
≤ 30 pF
Test
P u ls e R e p e titio n
V
P
RL
C
D iv id e r
www.emmicroelectronic.com
TR
Description
Increase the frequency for the
motor pulses to 16Hz (32Hz)
Output of square wave signal
(512Hz)
M a s te r R e s e t
D iv id e r 1 H z
H1137
P
, the period for
R E S E T
V
P
Fig. 5
Fig. 4