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NCT7491MNTXG Datasheet(PDF) 8 Page - ON Semiconductor |
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NCT7491MNTXG Datasheet(HTML) 8 Page - ON Semiconductor |
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8 / 81 page  NCT7491 www.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. • IMON 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. 0x00−0xFF (page 1) and 0x100−0x1FF (page 2) • The NCT7491 supports PWM look−up 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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