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8.2
Electrical Requirements
8.2.1
Thermal Module Assembly Power Supply
The boxed processor's Thermal Module Assembly (TMA) requires a +12 V power supply.
The TMA will include power cable to power the integrated fan and will plug into the 4-
wire fan header on the baseboard. The power cable connector and pinout are shown in
Figure
45. Baseboards must provide a compatible power header to support the boxed
processor.
The TMA outputs a SENSE signal, which is an open-collector output that pulses at a rate
of 2 pulses per fan revolution. A baseboard pull-up resistor provides V
system board-mounted fan speed monitor requirements, if applicable. Use of the
SENSE signal is optional. If the SENSE signal is not used, pin 3 of the connector should
be tied to GND.
The TMA receives a Pulse Width Modulation (PWM) signal from the motherboard from
th
the 4
pin of the connector labeled as CONTROL.
Note:
The boxed processor's TMA requires a constant +12 V supplied to pin 2 and does not
support variable voltage control or 3-pin PWM control.
The power header on the baseboard must be positioned to allow the TMA power cable
to reach it. The power header identification and location should be documented in the
platform documentation, or on the system board itself.
the fan power connector relative to the processor socket. The baseboard power header
should be positioned within 4.33 inches from the center of the processor socket.
Figure 45.
Boxed Processor TMA Power Cable Connector Description
1 2 3 4
116
Balanced Technology Extended (BTX) Boxed Processor Specifications
Table
40contains specifications for the input and output signals at the TMA.
Pin
Signal
1
GND
+12 V
2
3
SENSE
CONTROL
4
Figure 46
Straight square pin, 4-pin terminal housing with
polarizing ribs and friction locking ramp.
0.100" pitch, 0.025" square pin width.
Match with straight pin, friction lock header on
mainboard.
to match the
OH
shows the location of
B
d P
P C bl
Datasheet
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