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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
http://onsemi.com
LFCSP ? 32
CASE 932
PIN ASSIGNMENT
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
VID0/GPIO1/TACH1
VID1/GPIO2/TACH2
VID2/GPIO3/TACH3
VID3/GPIO4/TACH4
V CC
GND
TACH5/+12V1
TACH6/+12V2
1
2
3
4
5
6
7
8
PIN 1
INDICATOR
ADT7462
24
23
22
21
20
19
18
17
V CCP2 /
+1.5V/+1.8V/+2.5V
V CCP1 /
+1.5V/+1.8V/+2.5V
TACH8/+12V3
TACH7/+5V
D3–/SCSI_TERM2
D3+/+1.25V/+0.9V
D2–
D2+
?
?
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
MARKING DIAGRAM
ADT
7462ACPZ
#YYWW
AL
CCCCC
?
?
?
Extended Operating Range from ? 40 ? C to +125 ? C
Space-saving 32-lead Chip Scale Package
This is a Pb-Free Device*
ADT7462ACPZ
#
YYWW
AL
= Specific Device Code
= Pb-Free Package
= Date Code
= Assembly Lot
Applications
CC
= Country Code
? 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.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 81 of this data sheet.
? Semiconductor Components Industries, LLC, 2012
May, 2012 ? Rev. 4
1
Publication Order Number:
ADT7462/D
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