參數(shù)資料
型號(hào): NCT7491RQR2G
廠商: ON Semiconductor
文件頁(yè)數(shù): 8/80頁(yè)
文件大?。?/td> 844K
描述: IC REMOTE THERMAL MONITOR 24QSOP
標(biāo)準(zhǔn)包裝: 2,500
系列: *
NCT7491
http://onsemi.com
8
Table 4. COMPARISON OF NCT7491 AND ADT7490 QSOP PINOUTS
QSOP Pin No.
NCT7491
ADT7490
1
SDA_S
SDA
2
SCL_S
SCL
3
GND
GND
4
VDD
VDD
5
SDA_M / GPIO1
GPIO1
6
SCL_M / GPIO2
GPIO2
7
PECI
PECI
8
VTT
VTT
9
TACH3
TACH3
10
PWM2 / #SMBALERT
PWM2 / #SMBALERT
11
TACH1
TACH1
12
TACH2
TACH2
13
PWM3 /#ADDREN
PWM3 /#ADDREN
14
TACH4/#THERM/#SMBALERT/
#ADDRESS SELECT
TACH4/#THERM/#SMBALERT/
#ADDRESS SELECT
15
D2
D2
16
D2+
D2+
17
D1
D1
18
D1+
D1+
19
GPIO3/#THERM/#SMBALERT
IMON
20
+5Vin
+5Vin
21
+12Vin
+12Vin
22
+2.5V / #THERM
+2.5V / #THERM
23
Vccp
Vccp
24
PWM1 / XTO
PWM1 / XTO
Functional Comparison between the NCT7491 and the ADT7490
" NCT7491 supports PECI 3.0 commands.
" NCT7491 uses an SMBus Master port to read digital
temperatures.
" I
MON
 voltage monitoring pin (pin 19) on the ADT7490
is replaced with digital pin
(SMBALERT/THERM/GPIO) on the NCT7491
" NCT7491 does not support Dynamic Tmin fan control.
" NCT7491 allows any combination of temperature
sources to control any fan.
" NCT7491 allows individual PWM responses to
THERM events.
" NCT7491 THERM behaviour is more flexible,
allowing stepped response to THERM events.
" REPLACE mode for PECI is not supported by the
NCT7491
" The NCT7491 register map is organized into two pages.
0x000xFF (page 1) and 0x1000x1FF (page 2)
" The NCT7491 supports PWM lookup table automatic
fan control along with the Tmin/Trange control method
used in the ADT7490
" The NCT7491 allows temperatures to be written to the
device from an external master. These values can be
assigned for fan control and Limit/THERM assertion
functions
" PECI fan control can be implemented in relative or
absolute modes. Absolute mode uses the Tjmax value
read from the CPU plus the PECI temperature to
determine the actual core temperature.
" The reference for voltage measurement has changed
from 2.25 V on the ADT7490 to 2 V on the NCT7491.
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