LM94 datasheet(6/24 Pages) NSC

6 / 24 page

9.0 Pin Descriptions (Continued)

Symbol

Pin #

Type

Function

REMOTE1−

Remote Thermal

Diode_1- Input (CPU

1 THERMDC)

This is the negative input (current sink) from both of the CPU1

thermal diodes. Connected to THERMDC pin of Pentium processor

or the emitter of a diode connected MMBT3904 NPN transistor.

Serves as the negative input into the A/D for thermal diode voltage

measurements. A 100 pF capacitor is optional and can be

connected between REMOTE1− and REMOTE1+.

REMOTE1a+

Remote Thermal

Diode_1+ I/O (CPU1

THERMDA1)

This is a positive connection to the first CPU1 thermal diode. Serves

as the positive input into the A/D for thermal diode voltage

measurements. It also serves as a current source output that

forward biases the thermal diode. Connected to THERMDA pin of

Pentium processor or the base of a diode connected MMBT3904

NPN transistor. A 100 pF capacitor is optional and can be

connected between REMOTE1− and each REMOTE1+.

REMOTE2−

Remote Thermal

Diode_2 - Input

(CPU2 THERMDC)

This is the negative input (current sink) from both of the CPU2

thermal diodes. Connected to THERMDC pins of Pentium processor

or the emitter of a diode connected MMBT3904 NPN transistor.

Serves as the negative input into the A/D for thermal diode voltage

measurements. A 100 pF capacitor is optional and can be

connected between REMOTE2− and each REMOTE2+.

REMOTE2a+

Remote Thermal

Diode_2 + I/O (CPU2

THERMDA1)

This is a positive connection to the first CPU2 thermal diode. Serves

as the positive input into the A/D for thermal diode voltage

measurements. It also serves as a current source output that

forward biases the thermal diode. Connected to THERMDA pin of

Pentium processor or the base of a diode connected MMBT3904

NPN transistor. A 100 pF capacitor is optional and can be

connected between REMOTE2− and REMOTE2+.

AD_IN1/REMOTE1b+

Analog Input (+12V1

or CPU1

THERMDA2)

Analog Input for +12V Rail 1 monitoring, for CPU1 voltage regulator.

External attenuation resistors required such that 12V is attenuated

to 0.927V for nominal 3⁄4 scale reading. This pin may also serve as

the second positive thermal diode input for CPU1.

AD_IN2/REMOTE2b+

Analog Input (+12V2

or CPU2

THERMDA2)

Analog Input for +12V Rail 2 monitoring, for CPU2 voltage regulator.

External attenuation resistors required such that 12V is attenuated

to 0.927V for nominal 3⁄4 scale reading. This pin may also serve as

the second positive thermal diode input for CPU2.

AD_IN3

Analog Input (+12V3)

Analog Input for +12V Rail 3, for Memory/3GIO slots. External

attenuation resistors required such that 12V is attenuated to 0.927V

for nominal 3⁄4 scale reading.

AD_IN4

Analog Input

(FSB_Vtt)

Analog input for 1.2V monitoring, nominal 3⁄4 scale reading

AD_IN5

Analog Input (3GIO /

PXH / MCH_Core)

Analog input for 1.5V monitoring, nominal 3⁄4 scale reading

AD_IN6

Analog Input

(ICH_Core)

Analog input for 1.5V monitoring, nominal 3⁄4 scale reading

AD_IN7 (P1_Vccp)

Analog Input

(CPU1_Vccp)

Analog input for +Vccp (processor voltage) monitoring.

AD_IN8 (P2_Vccp)

Analog Input

(CPU2_Vccp)

Analog input for +Vccp (processor voltage) monitoring.

AD_IN9

Analog Input (+3.3V)

Analog input for +3.3V monitoring, nominal 3⁄4 scale reading

AD_IN10

Analog Input (+5V)

Analog input for +5V monitoring silver box supply monitoring,

nominal 3⁄4 scale reading

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