ADT7463
http://onsemi.com
3
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Unit
Positive Supply Voltage (V
CC
)
6.5
V
Voltage on +12V
IN
Pin
20
V
Voltage on Any Input or Output Pin
0.3 to +6.5
V
Input Current at Any Pin
?
mA
Package Input Current
?0
mA
Maximum Junction Temperature (T
J
MAX
)
150
癈
Storage Temperature Range
65 to +150
癈
Lead Temperature, Soldering
IR Reflow Peak Temperature
IR Reflow Peak Temperature for PbFree
Lead Temperature (Soldering, 10 sec)
220
260
300
癈
ESD Rating
1500
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. THERMAL CHARACTERISTICS
Package Type
q
JA
q
JC
Unit
24lead QSOP
105
39
癈/W
Table 3. PIN ASSIGNMENT
Pin No.
Mnemonic
Description
1
SDA
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus.
2
SCL
Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pullup.
3
GND
Ground Pin for the ADT7463.
4
V
CC
Power Supply. Can be powered by 3.3 V standby if monitoring in low power states is required.
VCC is also monitored through this pin. The ADT7463 can also be powered from a 5 V supply.
Setting Bit 7 of Configuration Register 1 (Reg. 0x40) rescales the V
CC
input attenuators to
correctly measure a 5 V supply.
5
VID0
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID
register (Reg. 0x43).
6
VID1
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID
register (Reg. 0x43).
7
VID2
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID
register (Reg. 0x43).
8
VID3
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID
register (Reg. 0x43).
9
TACH3
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3. Can be
reconfigured as an analog input (AIN3) to measure the speed of 2wire fans.
10
PWM2
SMBALERT
Digital Output (Open Drain). Requires 10 kW typical pullup. Pulsewidth modulated output to
control FAN 2 speed.
Digital Output (Open Drain). This pin may be reconfigured as an SMBALERT
interrupt output
to signal outoflimit conditions.
11
TACH1
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 1. Can be
reconfigured as an analog input (AIN1) to measure the speed of 2wire fans.
12
TACH2
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 2wire fans.
13
PWM3
ADDRESS ENABLE
Digital I/O (Open Drain). Pulsewidth modulated output to control Fan 3/Fan 4 speed.
Requires 10 kW typical pullup.
If pulled low on powerup, this places the ADT7463 into address select mode, and the state of
Pin 14 will determine the ADT7463s slave address.