ADT7460ARQZ ON Semiconductor, ADT7460ARQZ Datasheet - Page 6

• Manufacturer Part Number: ADT7460ARQZ
• Description: IC REMOTE THRML/FAN CTRLR 16QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7460ARQZ

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 120°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 120°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Full Temp Accuracy: +/- 3 C
• Digital Output - Bus Interface: Serial (3-Wire)
• Maximum Operating Temperature: + 120 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADT7460
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 3. P
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
in Func
Mnemonic
SCL
GND
V
TACH3
PWM2
SMBALERT
TACH1
TACH2
PWM3
ADDRESS ENABLE
TACH4
ADDRESS SELECT
THERM
D2−
D2+
D1−
D1+
+2.5V
SMBALERT
PWM1/XTO
SDA
CC
IN
tion Descript
Description
Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pull-up.
Ground Pin for the ADT7
Power Supply. Can be powered by 3.3 V standby if monitoring in low power states is required. V
monitored through this pin. The ADT7460 can also be powered from a 5 V supply. Setting Bit 7 of
Configuration Register 1 (Reg. 0x40) rescales the V
Digital Input (Open Drain). Fan tachometer input to measu
analog input (AIN3) to measure the speed of 2-wire fans.
Digital O
Fan 2 speed.
Digital Output (Open Drain). This pin may be reconfigured as an SMBALERT interrupt output to signal
out-of-limit conditions.
Digital Input (Open Drain). Fan tachometer input to measu
analog input (AIN1) to measure the speed of 2-wire fans.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2. Can be reconfigured as an
analog input (AIN2) to measure the speed of 2-wire fans.
Digital I/O (Open Drain). Pulse-width modulated output to control Fan 3/4 speed. Requires 10 kΩ t
pull-up.
If pulled low on power-up, this places the ADT7460 into address select mode, and the state of Pin 9
determines the ADT7460’s slave address.
Digital Input (Open Drain). Fan tachometer in
analog input (AIN4) to measure the speed of 2-wire fans.
If in address select mode, this pin determines the SMBus device address.
Alternatively, the pin may be reconfigured as a bidirectional THERM pin. Can be used to time and monit
assertions on the
processor or to the output of a trip point temperature sensor. Can be used as an output to signal
overtemperature conditions.
Cathode Connection to Second Thermal Diode.
Anode Connection to Second Thermal Diode.
Cathode Connection to First Thermal Diode.
Anode Connection to First Thermal Diode.
Analog Input. Monitors 2.5 V supply, typically a chipset voltage.
Digital Output (Open Drain). This pin may be reconfigured as an SMBALERT interrupt output to signal
out-of-limit conditions.
Digital Output (Open Drain). Pulse-width modulated output to control Fan 1 speed. Requires 10 kΩ typical
pull-up.
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus pull-up.
ions
PWM3/ADDRESS ENABLE
utput (Open Drain). Requires 10 kΩ typical pull-up. Pulse-width modulated output to control
PWM
2/SMBALERT
THERM input. For example, can be connected to the PROCHOT output of Intel’s Pentium 4
TACH3
TACH1
TACH2
GND
SCL
V
CC
460.
1
2
3
4
5
6
7
8
Figure 3. Pin Configuration
ADT7460
(Not to Scale)
Rev. C | Page 6 of 52
TOP VIEW
16
15
14
13
12
11
10
9
SDA
PWM1/XTO
D1+
D1–
D2+
D2–
TACH4/ADDRESS SELECT/THERM
+2.5V
put to measure speed of Fan 4. Can be reconfigured as an
IN
/SMBALERT
CC
input attenuators to correctly measure a 5 V supply.
re speed of Fan 3. Can be reconfigured as an
re speed of Fan 1. Can be reconfigured as an
CC
is also
ypical
or