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参数资料
| 型号： | NCT7491RQR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/80页 |
| 文件大小： | 844K |
| 描述： | IC REMOTE THERMAL MONITOR 24QSOP |
| 标准包装： | 2,500 |
| 系列： | * |
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NCT7491
http://onsemi.com
7
Table 3. QSOP & QFN PACKAGE PIN ASSIGNMENTS
QSOP
Pin No.
QFN
Pin No.
Pin Name
Description
1
22
SDA_S
SMBus/I
2
C Slave Serial Bidirectional Data Input/Output. Opendrain pin; Re-
quires a pullup resistor.
2
23
SCL_S
Serial Clock Slave Input. Opendrain pin; Requires a pullup resistor.
3
24
GND
Ground
4
1
VDD
Positive Supply Voltage
5
2
SDA_M / GPIO1
Opendrain pin; Requires a pullup resistor.
GPIO1 = General purpose I/O pin
SDA_M = SMBus/I
2
C Master Serial Bidirectional Data Input/Output.
6
3
SCL_M / GPIO2
Opendrain pin; Requires a pullup resistor.
GPIO2 = General purpose I/O pin
SCL_M = Serial Clock Master Output.
7
4
PECI
PECI input to report CPU Thermal Information. PECI voltage level is referenced
to the VTT input.
8
5
VTT
Voltage reference for PECI. This is the supply voltage for the PECI interface and
must be present to communicate over the PECI interface.
9
6
TACH3
Fan tachometer input to measure Fan3
10
7
PWM2 / #SMBALERT
PWM output to control Fan2. Can be configured as an SMBALERT output.
Opendrain pin; Requires a pullup resistor.
11
8
TACH1
Fan tachometer input to measure Fan1
12
9
TACH2
Fan tachometer input to measure Fan2
13
10
PWM3 /
#ADDREN
PWM output to control Fan3. If pulled low on powerup the NCT7491 enters
Address Select mode and the ADDRESS SELECT pin determines the slave
address. Opendrain pin; Requires a pullup resistor.
14
11
TACH4/
#THERM/
#SMBALERT/
#ADDRESS SELECT
Fan Tachometer Input to Measure Speed of Fan 4. May be reconfigured as a
bidirectional THERM. Can be connected to thePROCHOT output of a processor,
to time and monitor PROCHOT assertions. Can be used as an output to signal
an overtemperature condition. The SMBALERT pin is used to signal outoflimit
comparisons of temperature, voltage, and fan speed. This is compatible with
SMBus alert. Can also be used at device powerup to assign the SMBus ad-
dress. If THERM or SMBALERT is enabled then a pullup resistor is required.
15
12
D2
Negative Connection for Remote Temperature Sensor 2.
16
13
D2+
Positive Connection for Remote Temperature Sensor 2.
17
14
D1
Negative Connection for Remote Temperature Sensor 1.
18
15
D1+
Positive Connection for Remote Temperature Sensor 1.
19
16
GPIO3/
#THERM/
#SMBALERT
GeneralPurpose OpenDrain Digital Input/Output. Requires a pullup resistor.
Can be configured as a bidirectional THERM pin or as an SMBALERT pin.
20
17
+5Vin
Analog Input. 0 V to 5 V.
21
18
+12Vin
Analog Input. 0 V to 12 V.
22
19
+2.5V / #THERM
Analog Input. 0 V to 2.5 V. May be reconfigured as a bidirectional THERM pin.
Can be connected to the PROCHOT output of a processor, to time and monitor
PROCHOT assertions. Can be used as an output to signal an overtemperature
condition. In THERM mode it is an opendrain bidirectional pin and requires a
pull up resistor.
23
20
Vccp
Analog input. Monitors CPU core voltage (to maximum 0f 3.0 V). This pin must
be connected to the NCT7491 supply voltage if it is unused.
24
21
PWM1 / XTO
PWM output to control Fan 1. Opendrain pin; Requires a pullup resistor. Also
functions as the output for the XNOR tree test enable mode.
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