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ADT7463
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4
Table 3. PIN ASSIGNMENT
Pin No.
Description
Mnemonic
14
TACH4
ADDRESS SELECT
THERM
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 2wire 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 monitor assertions on the THERM
 input. For example, can be connected to the
PROCHOT
 output of Intels Pentium
?/DIV>
4 processor or to the output of a trip point temperature
sensor. Can be used as an output to signal overtemperature conditions.
15
D2
Cathode Connection to Second Thermal Diode.
16
D2+
Anode Connection to Second Thermal Diode.
17
D1
Cathode Connection to First Thermal Diode.
18
D1+
Anode Connection to First Thermal Diode.
19
VID4
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID
register (Reg. 0x43).
20
+5V
IN
THERM
Analog Input. Monitors 5 V power supply.
Alternatively, this pin may be reconfigured as a bidirectional THERM
 pin. Can be used to time
and monitor assertions on the THERM
 input. For example, can be connected to the
PROCHOT
 output of Intels Pentium
?/DIV>
4 processor or to the output of a trip point temperature
sensor. Can be used as an output to signal overtemperature conditions.
21
+12V
IN
VID5
Analog Input. Monitors 12 V power supply.
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID
register (Reg. 0x43). Supports VRM10 solutions.
22
+2.5V
IN
SMBALERT
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 outoflimit conditions.
23
V
CCP
Analog Input. Monitors processor core voltage (0 V to 3 V).
24
PWM1
XTO
Digital Output (Open Drain). Pulsewidth modulated output to control Fan 1 speed. Requires
10 kW typical pullup.
Also functions as the output from the XOR tree in XOR test mode.
Table 4. ELECTRICAL CHARACTERISTICS (T
A
 = T
MIN
 to T
MAX
, V
CC
 = V
MIN
 to V
MAX
, unless otherwise noted.) (Notes 1, 2, 3, 4)
Parameter
Test Conditions/Comments
Min
Typ
Max
Unit
POWER SUPPLY
Supply Voltage
3.0
5.0
5.5
V
Supply Current, I
CC
Interface Inactive, ADC Active
Standby Mode




3.0
20
mA
mA
TEMPERATURETODIGITAL CONVERTER
Local Sensor Accuracy
0癈 d T
A
 d 70癈
40癈 d T
A
 d +120癈


?.5

?.5
?.0
癈
Resolution

0.25

癈
Remote Diode Sensor Accuracy
0癈 d T
A
 d 70癈; 0癈 d T
D
 d 120癈
0癈 d T
A
 d 105癈; 0癈 d T
D
 d 120癈
0癈 d T
A
 d 120癈; 0癈 d T
D
 d 120癈



?.5


?.5
?.5
?.0
癈
Resolution

0.25

癈
Remote Sensor Source Current
High Level
Low Level


180
11


mA
ANALOGTODIGITAL CONVERTER (INCLUDING MUX AND ATTENUATORS)
Total Unadjusted Error, TUE


?.5
%
Differential Nonlinearity, DNL


?.0
LSB
Power Supply Sensitivity

?.1

%/V
Conversion Time (Voltage Input)
Averaging Enabled

11.38
13
ms
Conversion Time (Local Temperature)
Averaging Enabled

12.09
13.50
ms
Conversion Time (Remote Temperature)
Averaging Enabled

25.59
28
ms
Total Monitoring Cycle Time
Averaging Enabled
Averaging Disabled


120.17
13.51
134.50
15
ms
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