Flexible Temperature and Voltage Monitor
and System Fan Controller
ADT7462
FEATURES
GENERAL DESCRIPTION
One local and up to three remote temperature channels
Series resistance cancellation on remote channels
Thermal protection using THERM pins
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.
Up to four PWM fan drive outputs
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. There are up to eight TACH inputs,
which 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.
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 TMIN control
Monitors up to 13 voltage inputs
Monitors up to 7 VID inputs
Includes VID-on-fly support
Bidirectional reset
Chassis intrusion detect
SMBus 1.1- and SMBus 1.0-compatible
3.3 V and 5 V operation
Extended operating range from −40°C to +125°C
Space-saving 32-lead chip scale package
The ADT7462 is fully compatible with SMBus 1.1 and SMBus 1.0.
THERM
RESET
The ADT7462 also includes a
I/O and a
I/O.
The ADT7462 is available in a 32-lead LFCSP_VQ. Many of the
pins are multifunctional. There are five easy configuration options,
which are set up using the easy configuration register. Users pick
the configuration closest to their requirements; individual pins
can be reconfigured after the easy configuration option has
been chosen.
APPLICATIONS
Servers and personal computers
Telecommunications equipment
Test equipment and measurement instruments
FUNCTIONAL BLOCK DIAGRAM
SMBus
ADDRESS
SCL SDA
ALERT
ADT7462
SMBus
ADDRESS
SELECTION
SERIAL BUS
INTERFACE
VID
VID0 TO VID6
ADDRESS POINTER
REGISTER
REGISTER
AUTOMATIC
ACOUSTIC
ENHANCEMENT
CONTROL
FAN SPEED
CONTROL
PWM
CONFIGURATION
REGISTERS
PWM REGISTERS
PWM1 TO PWM4
FAN2MAX
DYNAMIC T
MIN
INTERRUPT
MASKING
CONTROL
FAN SPEED
COUNTER
TACH1 TO TACH8
INTERRUPT
STATUS
REGISTERS
CI
PERFORMANCE
MONITORING
LIMIT
COMPARATORS
VR_HOT2
VR_HOT1
THERM2
THERM1
THERMAL
PROTECTION
VALUE AND LIMIT
REGISTERS
INPUT SIGNAL
CONDITIONING
AND ANALOG
MULTIPLEXER
THERMAL DIODE INPUTS
VOLTAGE INPUTS
RESET
RESET
13-BIT
ADC
CIRCUIT
GPIO STATUS AND
CONFIGURATION
REGISTERS
GPIO1 TO GPIO8
BAND GAP
TEMPERATURE
SENSOR
BAND GAP
REFERENCE
SCSI_TERM1 AND
SCSI_TERM2
SCSI STATUS
GND
Figure 1.
Rev. 0
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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