ADM1033
http://onsemi.com
3
Table 2. THERMAL CHARACTERISTICS
Package Type
q
JA
q
JC
Unit
16-lead QSOP Package
150
39
癈/W
Table 3. PIN ASSIGNMENT
Pin No.
Mnemonic
Description
1
DRIVE1
DRIVE1 Pin Drives Fan 1. Open-drain output. Requires a pullup resistor.
2
TACH1
Fan 1 Fan Speed Measurement Input. Connects to the fans TACH output to measure the fan speed.
3
ALERT
 Comp
Open-Drain Active Low Output. Assets low whenever a measurement goes outside its programmed
limits if not masked. Automatically goes high again when the measured parameter falls back within its
limits.
4
NC
No Connect.
5
GND
Ground for Analog and Digital Circuitry.
6
VCC
Power. Can be powered by 3.3 V standby power if monitoring in low power states is required.
7
THERM
Can be configured as an overtemperature interrupt output, or as an input (to monitor PROCHOT
 output
of an INTEL CPU). A timer measures assertion times on the THERM
 pin (either input or output).
8
FAN_FAULT
/R
EF
FAN_FAULT
: Open-Drain Output. Asserted low when one or both fans stall. Requires a pullup
resistor to V
CC
. REF: Analog Input Reference for the THERM
 Input.
9
D1
Cathode Connection for the First Thermal Diode or Diode-Connected Transistor.
10
D1+
Anode Connection for the First Thermal Diode or Diode-Connected Transistor.
11
NC
No Connect.
12
NC
No Connect.
13
LOCATION
8-level Analog Input. Used to determine the correct SMBus version and the SMBus address (in fixed
and discoverable mode) and to set the LLL bits in the UDID (in ARP-capable mode).
14
ALERT
Open-Drain Output. SMBusALERT
 pin. Alerts the system in the case of out-of-limit events, such as
over temperature. Can be configured as sticky SMBus mode or comparator mode.
15
SDA
Serial Bus Bidirectional Data. Connects to the SMBus masters data line. Requires pullup resistor if
not provided elsewhere in the system.
16
SCL
Serial SMBus Clock Input. Connects to the SMBus masters clock line. Requires pullup resistor if not
already provided in the system.
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