CS4161 Datasheet, PDF (4/8 Pages) Cherry Semiconductor Corporation – 85mA Dual H-Bridge Odometer Driver with Divide by Select and UVLO

CS4161
CIRCUIT OPERATION
SPEED SENSOR INPUT
SENSOR is a PNP comparator input which accepts either
a sine wave or a square wave input. This input is protected
from excursions above V_CC as well as any below ground as
long as the current is limited to 1.5 mA. It has an active
clamp set to zero volts to prevent negative input voltages
from disrupting normal operation. The sensor input can
withstand 150 V_DC as long as the input current is limited to
1.5 mA max. using a series resistor of 100 kΩ.
COIL DRIVER OUTPUTS
Simultaneously energizing the source and sink on either
leg is not permitted, i.e. Q1 & Q2 or Q3 & Q4 cannot be
energized simultaneously.
Circuit function is not affected by inductive transients due
to coil loads as specified in the Transition States section.
The transition states occur as indicated in Table 1 without
any intermediate states permitted.
Table 1. Transition States
State
Coil A
0
+
1
OFF
2
–
3
–
4
–
5
OFF
6
+
7
+
Coil B
+
+
+
OFF
–
–
–
OFF
The polarity definition for the coil driver outputs is as
follows:
Polarity
Positive (+)
Negative (–)
Connect Coil +
V_CC
GND
Connect Coil –
GND
V_CC
DIVIDER SELECT INPUT
The speed sensor input frequency is either divided by one
or divided by two depending on the state of the SELECT
input as follows:
Logic 0 = divide by 2.
Logic 1 = divide by 1.
Short
Circuit
V_CC
Sense
Q1
Q3
Resistor
Overvoltage
and
Coil Short Circuit
Protection
Q2
Q4
Short
Circuit
Sense
GND
Resistor
Figure 2. Coil Driver Output
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