AMC6821-Q1 Datasheet, PDF (49/54 Pages) Texas Instruments – INTELLIGENT TEMPERATURE MONITOR AND PWM FAN CONTROLLER

AMC6821-Q1
www.ti.com ...................................................................................................................................................................................................... SBAS475 – JUNE 2009
TACH Low Limit Register
Bit 7 (MSB)
TACH-Low-
Limit7
TACH-Low-Limit-LByte Register (Address 0x10, Power-On Default = 0xFF)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
TACH-Low-
Limit6
TACH-Low-
Limit5
TACH-Low-
Limit4
TACH-Low-
Limit3
TACH-Low-
Limit2
TACH-Low-
Limit1
Bit 0 (LSB)
TACH-Low-
Limit0
Bit 7 (MSB)
TACH-Low-
Limit15
TACH-Low-Limit-HByte Register (Address 0x11, Power-On Default = 0xFF)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
TACH-Low-
Limit14
TACH-Low-
Limit13
TACH-Low-
Limit12
TACH-Low-
Limit11
TACH-Low-
Limit10
TACH-Low-
Limit9
Bit 0 (LSB)
TACH-Low-
Limit8
Bits [TACH-Low-Limit15:TACH-Low-Limit0] are the value that corresponds to the predetermined minimum
allowable fan speed (RPM). If the value of the TACH data register is greater than this bound, the fan speed is
below the minimum allowed RPM.
TACH High Limit Register
Bit 7 (MSB)
TACH-High-
Limit7
TACH-High-Limit-LByte Register (Address 0x12, Power-On Default = 0x00)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
TACH-High-
Limit6
TACH-High-
Limit5
TACH-High-
Limit4
TACH-High-
Limit3
TACH-High-
Limit2
TACH-High-
Limit1
Bit 0 (LSB)
TACH-High-
Limit0
Bit 7 (MSB)
TACH-High-
Limit15
TACH-High-Limit-HByte Register (Address 0x13, Power-On Default = 0x00)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
TACH-High-
Limit14
TACH-High-
Limit13
TACH-High-
Limit12
TACH-High-
Limit11
TACH-High-
Limit10
TACH-High-
Limit9
Bit 0 (LSB)
TACH-High-
Limit8
Bits [TACH-High-Limit15:TACH-High-Limit0] are the value that corresponds to the predetermined maximum
allowable fan speed (RPM). If the value of the TACH data register is smaller than this bound, the fan speed is
above the maximum allowed RPM.
Copyright © 2009, Texas Instruments Incorporated
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