參數(shù)資料
型號： NCT7491RQR2G
廠商： ON Semiconductor
文件頁數(shù)： 20/80頁
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
20
The NCT7491 will not attempt to read from a device that
has a Device Address byte that is set to 0.
Temperature Values:
" Device0 (PCH), 0xA8
" Device1 (DIMM0), 0xA9
" Device2 (DIMM1), 0xAA
" Device3 (DIMM2), 0xAB
" Device4 (DIMM3), 0xAC
" Device5, 0xAD
" Device6, 0xAE
" Device7, 0xAF
The results of the readings from each of the thermal slave
devices are stored here.
Thermal Slave Data Formats
It is necessary for the NCT7491 to be configured so that
the data format for each SMBus client device is known, e.g.
if the data is 2s Complement or unsigned data, or if a JEDEC
standard SPD device is used so that the data can be correctly
read from the device. Each SMBus device has a bit field to
determine the data format for that device. The format
selected for the device determines its behaviour for
outoflimit comparisons, THERM assertions and fan
control operation. For Device0, if the format is set to PCH
Block Read then the resulting data is stored as unsigned
binary. The VR12 literal mode can be selected to allow
temperature or power data be read from a VR12 controller
via the PMBus.
Table 12. Device0 FORMATS
0xB2 <1:0>
Format
00
2s Complement
01
JEDEC SPD standard
10
Unsigned binary
11
PCH block reads
Table 13. Device1 FORMATS
0xB2 <3:2>
Format
00
2s Complement
01
JEDEC SPD standard
10
Unsigned binary
11
reserved
Table 14. Device2 FORMATS
0xB2 <5:4>
Format
00
2s Complement
01
JEDEC SPD standard
10
Unsigned binary
11
reserved
Table 15. Device3 FORMATS
0xB2 <7:6>
Format
00
2s Complement
01
JEDEC SPD standard
10
Unsigned binary
11
reserved
Table 16. Device4 FORMATS
0xB3 <1:0>
Format
00
2s Complement
01
JEDEC SPD standard
10
Unsigned binary
11
reserved
Table 17. Device5 FORMATS
0xB3 <3:2>
Format
00
2s Complement
01
JEDEC SPD standard
10
Unsigned binary
11
VR12 Literal
Table 18. Device6 FORMATS
0xB3 <5:4>
Format
00
2s Complement
01
JEDEC SPD standard
10
Unsigned binary
11
VR12 Literal
Table 19. Device7 FORMATS
0xB3 <7:6>
Format
00
2s Complement
01
JEDEC SPD standard
10
Unsigned binary
11
VR12 Literal
SMBus Master Update Rate
The interval between successive reads from an SMBus
client device is determined by register 0xC7 bits <7:6>:
Table 20. SMBus UPDATE
0xC7 bits <7:6>
SMBus Update Rate
00
250 ms
01
500 ms
10
750 ms
11
1 sec
Thermal Slave Limits:
" SMB Slave High Limit, 0xC1
" SMB Slave Low Limit, 0xC2
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