AMC6821 datasheet(34/56 Pages) TI

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AMC6821

SBAS386C – MAY 2006 – REVISED JULY 2007

Table 14. Memory Map (continued)

ADDR

NAME

R/W

DEFAULT

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

TEMPERATURE MONITORING (continued)

PSV8

PSV7

PSV6

PSV5

PSV4

PSV3

0x1C

PSV-Temp

R/W

0x00

Passive Cooling Temperature threshold. 3 LSBs and two MSBs are '0'. For details, refer to the passive cooling

temperature limit in the Temperature Out-of-Range Detection section. Default = 0

°C.

RT-C10

RT-C9

RT-C8

RT-C7

RT-C6

RT-C5

RT-C4

RT-C3

0x1D

Remote-Critical-Temp

R/W

0x69

The 8 MSBs of Remote Critical temperature shutdown threshold. 3 LSBs are '0'. When the Remote-Temp is equal to or

above this limit, an RCRT interrupt occurs and OVR goes low. Default = +105

°C.

PWM CONTROLLER

FSPD

PWM2

PWM1

PWM0

STIME2

STIME1

STIME0

0x20

FAN-Characteristics

R/W

0x1D

Spin Dis

PWM Frequency Setting

Spin-Up Time Setting

L-DCY7

L-DCY6

L-DCY5

L-DCY4

L-DCY3

L-DCY2

L-DCY1

L-DCY0

0x21

DCY-Low-Temp

R/W

0x55

The duty cycle of PWM when the temperature is equal to or below Low-Temp in Auto Temp-Fan Control mode.

Default = 0x55, 33.2%.

DCY7 (MSB)

DCY6

DCY5

DCY4

DCY3

DCY2

DCY1

DCY0

Actual Duty cycle of PWM output. The duty cycle changes immediately after new data are written into this register. 8-bit,

0.39%/bit, range 0%-100%. Default = 33%.

In read operation, the returned data are the actual DCY value driving the PWM-Out pin with two exceptions. Refer to the

0x22

DCY (Duty Cycle)

R/W

0x55

DCY Register section.

In write operation, the data written are the actual DCY value driving the PWM-Out pin in Software-DCY control mode.

In all other control modes, the data are not used to drive the PWM. Instead, they are stored in a temporary register, and

used to control the PWM immediately after the control mode is changed to software-DCY control.

RAMPE

STEP1

STEP0

RATE2

RATE1

RATE0

THRE1

THRE0

0x23

DCY-RAMP

R/W

0x52

DCY Adjustment Step in

DCY Update Rate in Auto Temp-Fan

Adjustment Threshold in

Ramp Enable

Auto Fan Control

Control

Auto Temp-Fan Control

L-TEMP4

L-TEMP3

L-TEMP2

L-TEMP1

L-TEMP0

L-SLP2

L-SLP1

L-SLP0

0x24

Local Temp-Fan Control

(1)

R/W

0x41

Low-Temp in Auto Local Temp-Fan control.

Slope in Auto Local Temp-Fan control.

R-TEMP4

R-TEMP3

R-TEMP2

R-TEMP1

R-TEMP0

R-SLP2

R-SLP1

R-SLP0

0x25

Remote Temp-Fan Control

R/W

0x61

Low-Temp in Auto Remote Temp-Fan control.

Slope in Auto Remote Temp-Fan control.

TACH (RPM) MEASUREMENT

TACH-

DATA7

DATA6

DATA5

DATA4

DATA3

DATA2

DATA1

DATA0

0x08

TACH-DATA-LByte

0x00

Low byte of TACH measurement.

TACH-

DATA15

DATA14

DATA13

DATA12

DATA11

DATA10

DATA9

DATA8

0x09

TACH-DATA-HByte

0x00

High byte of TACH measurement.

TACH-Low-

Limit7

Limit6

Limit5

Limit4

Limit3

Limit2

Limit1

Limit0

0x10

TACH-Low-Limit-LByte

R/W

0xFF

Low byte of TACH count limit corresponding to minimum allowed RPM. Since the TACH circuit counts between TACH

pulses, a slow fan results in a larger measured value. When the measured value is larger than TACH-Low-Limit, the fan

runs below the allowed minimum speed limit.

TACH-Low-

Limit15

Limit14

Limit13

Limit12

Limit11

Limit10

Limit9

Limit8

0x11

TACH-Low-Limit-HByte

R/W

0xFF

High byte of TACH Limit corresponding to minimum allowed RPM.

TACH-High-

Limit7

Limit6

Limit5

Limit4

Limit3

Limit2

Limit1

Limit0

0x12

TACH-High-Limit-LByte

R/W

0x00

Low byte of TACH count Limit corresponding to maximum allowed RPM. Since the TACH circuit counts between TACH

pulses, a fast fan results in a small measured value. When the measurement is less than this limit, the fan runs above the

allowed maximum speed limit.

TACH-High-

Limit15

Limit14

Limit13

Limit12

Limit11

Limit10

Limit9

Limit8

0x13

TACH-High-Limit-HByte

R/W

0x00

High byte of TACH limit corresponding to maximum allowed RPM.

TACH-

SETTING7

SETTING6

SETTING5

SETTING4

SETTING3

SETTING2

SETTING1

SETTING0

0x1E

TACH-SETTING-LByte

R/W

0xFF

Low byte of TACH value corresponding to the predetermined target fan speed. TACH-SETTING must be not greater than

the value corresponding to the RPM for 30% duty cycle when the TACH-MODE bit is cleared ('0').

TACH-

SETTING15

SETTING14

SETTING13

SETTING12

SETTING11

SETTING10

SETTING9

SETTING8

0x1F

TACH-SETTING-HByte

R/W

0xFF

High byte of TACH value corresponding to the predetermined fan speed. TACH-SETTING must be not greater than the

value corresponding to the RPM for 30% duty cycle when the TACH-MODE bit is cleared ('0').

0x3A

Reserved

0x00

Always read '0'.

0x3B

Reserved

0x00

Always read '0'.

(1)

Used to calculate the target PWM duty cycle for local temperature in maximum fast-speed calculated control.

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