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Semiconductor Components Industries, LLC, 2012
May, 2012 − Rev. 4
1 Publication Order Number:
ADT7462/D
ADT7462
Flexible Temperature,
Voltage Monitor, and
System Fan Controller
The ADT7462 is a flexible systems monitor IC, suitable for use in a
wide variety of applications. It can monitor temperature in up to three
remote locations, as well as its ambient temperature.
There are up to four PWM outputs. These can be used to control the
speed of a cooling fan by varying the % duty cycle of the PWM drive
signal applied to the fan. The ADT7462 supports high frequency
PWM for 4-wire fans and low frequency PWM for 2-wire and 3-wire
fans. Up to eight TACH inputs can be used to measure the speed of
3-wire and 4-wire fans. There are up to 13 voltage monitoring inputs,
ranging from 12 V to 0.9 V.
The ADT7462 is fully compatible with SMBus 1.1 and SMBus 1.0.
The ADT7462 also includes a THERM
I/O and a RESET I/O.
The ADT7462 is available in a 32-lead LFCSP_VQ. Many of the
pins are multi-functional. Five easy configuration options can be set
up using the easy configuration register. Users choose the
configuration closest to their requirements; individual pins can be
reconfigured after the easy configuration option has been chosen.
Features
One Local and Up to Three Remote Temperature Channels Series
Resistance Cancellation On Remote Channels
Thermal Protection Using THERM Pins
Up to Four PWM Fan Drive Outputs Supports Both High and
Low Frequency PWM Drives
Up to Eight TACH Inputs Measures the Speed of 3-wire and
4-wire Fans
Automatic Fan Speed Control Loop Includes Dynamic T
MIN
Control
Monitors Up to 13 V Inputs
Monitors Up to 7 VID Inputs; Includes On-The-Fly (OTF)
VID Support
Bidirectional Reset
Chassis Intrusion Detect
SMBus 1.1 and SMBus 1.0 Compatible
3.3 V and 5.0 V Operation
Extended Operating Range from −40C to +125C
Space-saving 32-lead Chip Scale Package
This is a Pb-Free Device*
Applications
Servers and Personal Computers
Telecommunications Equipment
Test Equipment and Measurement Instruments
* For additional information on our Pb-Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
http://onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page 81 of this data sheet.
ORDERING INFORMATION
MARKING DIAGRAM
PIN ASSIGNMENT
ADT7462ACPZ = Specific Device Code
# = Pb-Free Package
YYWW = Date Code
AL = Assembly Lot
CC = Country Code
ADT
7462ACPZ
#YYWW
AL
CCCCC
LFCSP−32
CASE 932
PIN 1
INDICATOR
1
VID0/GPIO1/TACH1
2
VID1/GPIO2/TACH2
3
VID2/GPIO3/TACH3
4
VID3/GPIO4/TACH4
5
V
CC
6
GND
7
TACH5/+12V1
8
TACH6/+12V2
24
V
CCP2
/
23
V
CCP1
/
22
TACH8/+12V3
21
TACH7/+5V
20
D3–/SCSI_TERM2
19
D3+/+1.25V/+0.9V
18
D2–
17
D2+
9
SCL
10
SDA
11
ADD
12
ALERT
13
PWM4/+3.3V
14
RESET
15
D1+/+2.5V/+1.8V
16
D1–/SCSI_TERM1
32
VID5/GPIO6/PWM2
31
VID4/GPIO5/PWM1
30
PWM3
29
THERM2/+1.5V2/GPIO8
28
THERM1/+1.5V1/GPIO7/VID6
27
FAN2MAX/CI
26
VR_HOT2/+1.2V2/V
BATT
25
ADT7462
VR_HOT1/+1.2V1/+3.3V
+1.5V/+1.8V/+2.5V
+1.5V/+1.8V/+2.5V
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