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ADM1033ARQZ Datenblatt(PDF) 7 Page - Analog Devices

Teilenummer ADM1033ARQZ
Bauteilbeschribung  Thermal Monitor and Fan Speed (RPM) Controller
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ADM1033
Rev. 0 | Page 7 of 40
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TACH
ALERT Comp
NC
THERM
VCC
GND
DRIVE
SDA
SMBusALERT
LOCATION
D+
FAN_FAULT/REF
D–
NC
NC
SCL
TOP VIEW
(Not to Scale)
ADM1033
NC = NO CONNECT
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
DRIVE
DRIVE Pin Drives the Fan. Open-drain output. Requires a pull-up resistor.
2
TACH
Fan Speed Measurement Input. Connects to the fan’s TACH output to measure the fan speed.
3
ALERT Comp
Open-Drain Active Low Output. Asserts 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/REF
FAN_FAULT: Open-Drain Output. Asserts low whenever the fan stalls.
REF: Analog Input Reference for THERM input.
9
D
Cathode Connection for the Thermal Diode or Diode-Connected Transistor.
10
D+
Anode Connection for the 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
SMBusALERT
Open-Drain Output. Alerts the system in the case of out-of-limit events such as overtemperature. Can be
reset only with software.
15
SDA
Serial Bus Bidirectional Data. Connects to the SMBus master’s data line. Requires a pull-up resistor, if one is
not provided elsewhere in the system.
16
SCL
Serial SMBus Clock Input. Connects to the SMBus master’s clock line. Requires a pull-up resistor, if one is
not provided elsewhere in the system.


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