AMC6821 datasheet(49/54 Pages) TI

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AMC6821

SBAS386C – MAY 2006 – REVISED JULY 2007

TACH Low Limit Register

TACH-Low-Limit-LByte Register (Address 0x10, Power-On Default = 0xFF)

Bit 7 (MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0 (LSB)

TACH-Low-Limit7

TACH-Low-Limit6

TACH-Low-Limit5

TACH-Low-Limit4

TACH-Low-Limit3

TACH-Low-Limit2

TACH-Low-Limit1

TACH-Low-Limit0

TACH-Low-Limit-HByte Register (Address 0x11, Power-On Default = 0xFF)

Bit 7 (MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0 (LSB)

TACH-Low-

Limit15

Limit14

Limit13

Limit12

Limit11

Limit10

Limit9

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

TACH-High-Limit-LByte Register (Address 0x12, Power-On Default = 0x00)

Bit 7 (MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0 (LSB)

TACH-High-Limit7 TACH-High-Limit6 TACH-High-Limit5 TACH-High-Limit4 TACH-High-Limit3 TACH-High-Limit2 TACH-High-Limit1 TACH-High-Limit0

TACH-High-Limit-HByte Register (Address 0x13, Power-On Default = 0x00)

Bit 7 (MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0 (LSB)

TACH-High-

TACH-High-Limit9 TACH-High-Limit8

Limit15

Limit14

Limit13

Limit12

Limit11

Limit10

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.

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