LM93 datasheet(9/92 Pages) NSC

9 / 92 page

9.0 Pin Descriptions (Continued)

Symbol

Pin #

Type

Function

REMOTE2−

Remote Thermal

Diode_2 - Input

(CPU2 THERMDC)

This is the negative input (current sink) from the CPU2 thermal

diode. 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 REMOTE2− and REMOTE2+.

REMOTE2+

Remote Thermal

Diode_2 + I/O (CPU2

THERMDA)

This is a positive connection to the 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

Analog Input (+12V1)

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

External attenuation resistors required such that 12V is attenuated

to 0.927V.

AD_IN2

Analog Input (+12V2)

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

External attenuation resistors required such that 12V is attenuated

to 0.927V.

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.

AD_IN4

Analog Input

(FSB_Vtt)

Analog input for 1.2V monitoring

AD_IN5

Analog Input (3GIO /

PXH / MCH_Core)

Analog input for 1.5V monitoring.

AD_IN6

Analog Input

(ICH_Core)

Analog input for 1.5V monitoring.

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.

AD_IN10

Analog Input (+5V)

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

AD_IN11

Analog Input

(SCSI_Core)

Analog input for +2.5V monitoring.

AD_IN12

Analog Input

(Mem_Core)

Analog input for +1.969V monitoring.

AD_IN13

Analog Input

(Mem_Vtt)

Analog input for +0.984V monitoring.

AD_IN14

Analog Input

(Gbit_Core)

Analog input for +0.984V S/B monitoring.

AD_IN15

Analog Input (-12V)

Analog input for -12V monitoring. External resistors required to scale

to positive level. Full scale reading at 1.236V.

Address Select

3 level analog input

This input selects the lower two bits of the LM93 SMBus slave

address.

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