Rainbow Electronics LM93 - Manual (Page 10)

9.0 Pin Descriptions
(Continued)
Symbol Pin # Type Function
AD_IN16 39 POWER (V
DD
) +3.3V
standby power
V
DD
power input for LM93. Generally this is connected to +3.3V
standby power.
The LM93 can be powered by +3.3V if monitoring in low power
states is not required, but power should be applied to this input
before any other pins.
This pin also serves as the analog input to monitor the 3.3V
stand-by (SB) voltage. It is necessary to bypass this pin with a 0.1
µF in parallel with 100 pF. A bulk capacitance of 10 µF should be in
the near vicinity. The 100 pF should be closest to the power pin.
GND 40 GROUND Digital Ground. Digital ground and analog ground need to be tied
together at the chip then both taken to a low noise system ground.
A voltage difference between analog and digital ground may cause
erroneous results.
PWM1 41 Digital Output
(Open-Drain)
Fan control output 1.
PWM2 42 Digital Output
(Open-Drain)
Fan control output 2
P1_VID0 43 Digital Input Voltage Identification signal from the processor.
P1_VID1 44 Digital Input Voltage Identification signal from the processor.
P1_VID2 45 Digital Input Voltage Identification signal from the processor.
P1_VID3 46 Digital Input Voltage Identification signal from the processor.
P1_VID4 47 Digital Input Voltage Identification signal from the processor.
P1_VID5 48 Digital Input Voltage Identification signal from the processor.
P1_PROCHOT 49 Digital I/O
(Open-Drain)
Connected to CPU1 PROCHOT (processor hot) signal through a
bidirectional level shifter.
P2_PROCHOT 50 Digital I/O
(Open-Drain)
Connected to CPU2 PROCHOT (processor hot) signal through a
bi-directional level shifter.
P2_VID0 51 Digital Input Voltage Identification signal from the processor.
P2_VID1 52 Digital Input Voltage Identification signal from the processor.
P2_VID2 53 Digital Input Voltage Identification signal from the processor.
P2_VID3 54 Digital Input Voltage Identification signal from the processor.
P2_VID4 55 Digital Input Voltage Identification signal from the processor.
P2_VID5 56 Digital Input Voltage Identification signal from the processor.
The overscore indicates the signal is active low (“Not”).
10.0 Server Terminology
A/D Analog to Digital Converter
ACPI Advanced Configuration and Power
Interface
ALERT SMBus signal to bus master that an event
occurred that has been flagged for
attention.
ASF Alert Standard Format
BMC Baseboard Micro-Controller
BW Bandwidth
DIMM Dual inline memory module
DP Dual-processor
ECC Error checking and correcting
FRU Field replaceable unit
FSB Front side bus
FW Firmware
Gb Gigabit
GB Gigabyte
Gbe Gigabit Ethernet
GPIO General purpose I/O
HW Hardware
I 2 C Inter integrated circuit (bus)
LAN Local area network
LVDS Low-Voltage Differential Signaling
Mb Megabit
MB Megabyte
MP Multi-processor
MTBF Mean time between failures
LM93
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