Broadcom ACPL-32JT, User Manual

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ACPL-32JT, ACPL-C87AT User Guide
Bus Voltage Sensing
Bus voltage is sensed through a precision resistor chain. ACPL-C87AT optically isolates the signal for transmission to a
microcontroller (output Voltage Sense Output (VSO) on P1 header).
The Bus Voltage Sense Ratio may be calculated as follows:
Connection Interface (Connector Header P1)
Pin Name Type LEVEL Item Logic
1 FLU OUT TTL Fault Feedback for U-bottom L: Fault
3 ULU OUT TTL Under-Voltage Lock Out Feedback for
U-bottom L: Under-Voltage Lock Out
5 FLV OUT TTL Fault Feedback for V-bottom L: Fault
7 ULV OUT TTL Under-Voltage Lock Out Feedback for
V-bottom L: Under-Voltage Lock Out
9 FLW OUT TTL Fault Feedback for W-bottom L: Fault
11 ULW OUT TTL Under-Voltage Lock Out Feedback for
W-bottom L: Under-Voltage Lock Out
13 UHU OUT TTL Under-Voltage Lock Out Feedback for U-top L: Under-Voltage Lock Out
15 FHU OUT TTL Fault Feedback for U-top L: Fault
17 UHV OUT TTL Under-Voltage Lock Out Feedback for V-top L: Under-Voltage Lock Out
19 FHV OUT TTL Fault Feedback for V-top L: Fault
21 UHW OUT TTL Under-Voltage Lock Out Feedback for W-top L: Under-Voltage Lock Out
23 FHW OUT TTL Fault Feedback for W-top L: Fault
2 PWMLW IN TTL PWM input for W-bottom H: Led on, L: Led off
4 PWMHW IN TTL PWM input for W-top H: Led on, L: Led off
6 PWMLV IN TTL PWM input for V-bottom H: Led on, L: Led off
8 PWMHV IN TTL PWM input for V-top H: Led on, L: Led off
10 PWMLU IN TTL PWM input for U-bottom H: Led on, L: Led off
12 PWMHU IN TTL PWM input for U-top H: Led on, L: Led off
14 DC12 Power 8V to 18V DC power supply —
16 GND1 Ground Ground Low Voltage Side Ground —
18 GND1 Ground Ground Low Voltage Side Ground —
20 VSO OUT Analog
(0 to 2V)
Bus Voltage Sensor Output Analog (0 to 2V)
22 OT1 OUT — Connection to IGBT NTC Thermistor Pin T1 —
24 OT2 OUT — Connection to IGBT NTC Thermistor Pin T2 —
Bus Voltage Sense Ratio
R146 R147
+
R142 R143 R144 R145 R146 R147
+ + + + +
----------------------------------------------------------------------------------------------------------
=
2k 2k
+
200k 200k 200k 200k 2k 2k
+ + + + +
-------------------------------------------------------------------------------------------
=
4.975 mV/V
=