Intel® Server Board SE7520JR2 Connectors and Jumper Blocks
Revision 1.0
C78844-002
199
There are two SSI compliant processor fan headers, CPU1 (J7F1) and CPU2 (J5F2), which are
not fan speed controlled. They are powered by a constant +12V. The pinout for these two
connector is defined in the following table.
Table 106: CPU1/CPU2 Fan Connector Pin-out (J5F2, J7F1)
Pin Signal Name Type Description
1 Fan Tach Out FAN_TACH signal is connected to the BMC to monitor the FAN speed
2 +12V Power Power Supply 12V
3 Ground GND GROUND is the power supply ground
The fan headers at J3K3 and J3K6 have fan speed control. Fan control is performed by two
pulse width modulator (PWM) outputs on the LM93. The mBMC initializes the LM93 to control
fan speeds based on temperature measurements according to a built-in table. The table itself is
loaded as part of the SDR package according to which system configuration is used.
The 2x12 fan header (J3K6) is used to control system fans in both the Intel Server Chassis
SR1400 and SR2400. The pinout for this connector is found in the following table.
Table 107: Intel Server Chassis Fan Header Pin-out (J3K6)
Pin Signal Name Type Description
1 BB_FAN_LED4_R IN
2 BB_FAN_LED2_R IN
3 BB_FAN_LED3_R IN
4 BB_FAN_LED1_R IN
5 FAN_TACH8 OUT FAN_TACH signal to monitor the FAN speed
6 FAN_TACH4 OUT FAN_TACH signal to monitor the FAN speed
7 FAN_TACH7 OUT FAN_TACH signal to monitor the FAN speed
8 FAN_TACH3 OUT FAN_TACH signal to monitor the FAN speed
9 FAN_TACH6 OUT FAN_TACH signal to monitor the FAN speed
10 FAN_TACH2 OUT FAN_TACH signal to monitor the FAN speed
11 FAN_TACH5 OUT FAN_TACH signal to monitor the FAN speed
12 FAN_TACH1 OUT FAN_TACH signal to monitor the FAN speed
13 GROUND GROUND
14 GROUND GROUND
15 GROUND GROUND
16 GROUND GROUND
17 FAN_SPEED_CNTL_2 IN Power supplied through fan speed control circuitry
18 FAN_SPEED_CNTL_1 IN Power supplied through fan speed control circuitry
19 FAN_SPEED_CNTL_2 IN Power supplied through fan speed control circuitry
20 FAN_SPEED_CNTL_2 IN Power supplied through fan speed control circuitry
21 BB_FAN_LED7_R IN
22 BB_FAN_LED5_R IN
23 BB_FAN_LED8_R IN
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