N
Copyright © 1999, 2000 National Semiconductor
www.national.com
- 6 -
3.4 JP6
The 22-pin header JP6 allows access to the analog inputs, fan inputs, DAC output and Chassis Intrusion
input of the LM87. The board comes shipped with shorting bars installed across the following pins:
Pins 7 and 8
Pins 15 and 16
Pins 17 and 18
Pins 19 and 20
Table 2 JP6 Description
Pin Number
Description
1
GND
2
Pin 19 of LM87, Vccp1
3
GND
4
Pin 18 of LM87, +2.5Vin/D2+
5
GND
6
Pin 17 of LM87, Vccp2/D2-
7
Regulated 3.3V from pin 2 of JP1
8
Pin 16 of LM87, +5.0Vin
9
GND
10
Pin 15 of LM87, +12Vin
11
C4, base of Q2, collector of Q2B (alternate D1+ sensor)
12
Pin 14 of LM87, D1+
13
C4, emitter of Q2, base of Q2B (alternate D1- sensor)
14
Pin 13 of LM87, D1-
15
Pin 4 of 74HCV14, used as a dummy fan oscillator
16
Pin 5 of LM87, FAN1/AIN1 input
17
Pin 2 of 74HCV14, used as a dummy fan oscillator
18
Pin 6 of LM87, FAN2/AIN2 input
19
R8 (chassis intrusion circuitry output)
20
Pin 7 of LM87, CI (Chassis Intrusion) input
21
GND
22
Pin 11 of LM87, DACOut/NTESTIN