Pin Configuration And Function Descriptions - Analog Devices dBCool ADT7467 Manual

ADT7467

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

Table 3. Pin Function Descriptions
Pin
No. Mnemonic Description
1 SCL Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pull-up.
2 GND Ground Pin for the ADT7467.
3 V
Power Supply. Can be powered by 3.3 V standby, if monitoring in low power states is required. V
CC
through this pin. The ADT7467 can also be powered from a 5 V supply. Setting Bit 7 of Configuration Register 1 (Reg.
0x40) rescales the V
4 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 2-wire fans (low frequency mode only).
5 PWM2 Digital Output (Open Drain). Requires 10 kΩ typical pull-up. Pulse width modulated output to control Fan 2 speed.
Can be configured as a high or low frequency drive.
SMBALERT Digital Output (Open Drain). This pin can be reconfigured as an SMBALERT interrupt output to signal out-of-limit
conditions.
6 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 2-wire fans (low frequency mode only).
7 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 2-wire fans (low frequency mode only).
8 PWM3 Digital I/O (Open Drain). Pulse width modulated output to control the speed of Fan 3 and Fan 4. Requires 10 kΩ
typical pull-up. Can be configured as a high or low frequency drive.
9 TACH4
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4. Can be reconfigured as an analog input
(AIN4) to measure the speed of 2-wire fans (low frequency mode only).
GPIO General Purpose Open Drain Digital I/O.
THERM Alternatively, the pin can be reconfigured as a bidirectional THERM pin, which can be used to time and monitor
assertions on the THERM input. For example, the pin can be connected to the PROCHOT output of an Intel Pentium 4
processor or to the output of a trip point temperature sensor. This pin can be used as an output to signal
overtemperature conditions.
SMBALERT Digital Output (Open Drain). This pin can be reconfigured as an SMBALERT interrupt output to signal out-of-limit
conditions.
10 D2− Cathode Connection to Second Thermal Diode.
11 D2+ Anode Connection to Second Thermal Diode.
12 D1− Cathode Connection to First Thermal Diode.
13 D1+ Anode Connection to First Thermal Diode.
14 V Analog Input. Monitors processor core voltage (0 V − 3 V).
CCP
15 PWM1 Digital Output (Open Drain). Pulse-width modulated output to control Fan 1 speed. Requires 10 kΩ typical pull-up.
XTO Also functions as the output from the XNOR tree in XNOR test mode.
16 SDA Digital I/O (Open Drain). SMBus bidirectional serial data. Requires 10 kΩ typical pull-up.
SCL
1
GND
2
V
3
CC
ADT7467
TACH3 4
TOP VIEW
PWM2/SMBALERT (NOT TO SCALE)
5
TACH1
6
7
TACH2
PWM3 8
Figure 3. Pin Configuration
input attenuators to correctly measure a 5 V supply.
CC
Rev. 0 | Page 6 of 80
SDA
16
PWM1/XTO
15
V
14
CCP
13 D1+
12 D1–
D2+
11
D2–
10
9 TACH4/GPIO/THERM/SMBALERT
is also monitored
CC