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CS4161
CIRCUIT OPERATION
SPEED SENSOR INPUT
SENSOR is a PNP comparator input which accepts either
The polarity definition for the coil driver outputs is as
follows:
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
Polarity
Positive (+)
Negative (–)
Connect Coil +
V CC
GND
Connect Coil –
GND
V CC
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 k ? .
COIL DRIVER OUTPUTS
DIVIDER SELECT INPUT
The speed sensor input frequency is either divided by one
or divided by two depending on the state of the SELECT
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
input as follows:
Logic 0 = divide by 2.
Logic 1 = divide by 1.
State
0
1
2
3
4
5
6
7
Coil A
+
OFF
–
–
–
OFF
+
+
Coil B
+
+
+
OFF
–
–
–
OFF
Short
Circuit
Sense
V CC
Q1
Q2
Q3
Q4
Resistor
Short
Coil
Overvoltage
and
Short Circuit
Protection
Circuit
GND
Sense
Resistor
Figure 2. Coil Driver Output
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