AMC6821-Q1 Datasheet, PDF (33/54 Pages) Texas Instruments – INTELLIGENT TEMPERATURE MONITOR AND PWM FAN CONTROLLER

AMC6821-Q1
www.ti.com ...................................................................................................................................................................................................... SBAS475 – JUNE 2009
REGISTER MAP
All registers are 8-bit. Table 14 shows the memory map. Locations that are marked Reserved read back 0x0000
if they are read by the host. Writing to these locations has no effect.
Table 14. Memory Map
ADDR
NAME
R/W DEFAULT
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
IDENTIFICATION REGISTERS
0
0
1
0
0
0
0
1
0x3D
Device ID Register
R
0x21
Device identification number. Always read '0x21'.
0
1
0
0
1
0
0
1
0x3E
Company ID Register
R
0x49
Company identification number.
CONFIGURATION REGISTERS
0x00
Configuration Register 1
R/W
0xD4
THERMOVIE
THERM INT
Enable
FDRC1
FDRC0
Fan Control Mode
FAN-Fault-
EN
FAN-Fault
Pin EN
PWMINV
FANIE
PWM Invert RPM Int EN
INT-EN
Global Int
EN
START
Start Monitor
0x01
Configuration Register 2
R/W
0x3D
RST
Reset
PSVIE
RTOIE
LPSV Int EN RT Int EN
LTOIE
LT Int EN
RTFIE
Remote
Failure Int
EN
TACH-EN
TACH EN
TACH-
MODE
TACH Mode
PWM-EN
PWM-Out
EN
THERM-FAN-
EN
0
0
0
0
0
1
0
0x3F
Configuration Register 3
R/W
0x82
THERM-Fan
Control
Part Revision Number
For Future
Use
PSPR
TACH-FAST OVREN
1
0
0
0
0x04
Configuration Register 4
R/W
0x08
Must be
rewritten to '1'.
Pulse
Number
TACH
Reading
Fast
OVR Pin EN
Reserved
0x02
Status Register 1
R
0x00
LTL
LT Low
LTH
LT High
RTF
RT Failure
R-THERM
RT Over
Therm
RTL
RT Low
RTH
RT High
FANS
Fan Slow
RPM-
ALARM
Fan Fast
0x03
Status Register 2
THERM-IN
L-THERM
LPSV
LTC
RTC
R
0x00
Therm Input
LT Over
Therm
LT Below
Therm
LT Over
Critical
RT Over
Critical
0
0
0
Reserved
TEMPERATURE MONITORING
0x06
Temp-DATA-LByte
R
0x00
LT2
LT1
LT0
3 LSBs of Local Reading
0
0
Reserved
RT2
RT1
RT0
3 LSBs of Remote Reading
LT10 (MSB)
LT9
LT8
LT7
LT6
LT5
LT4
LT3
0x0A Local-Temp-DATA-HByte
R
0x80
The 8 MSBs of newest reading of local temperature sensor. Default = –128°C.
RT10 (MSB)
RT9
RT8
RT7
RT6
RT5
RT4
RT3
0x0B Remote-Temp-DATA-HByte R
0x80
The 8 MSBs of newest reading of remote temperature sensor. Default = –128°C.
LT-H10
LT-H9
LT-H8
LT-H7
LT-H6
LT-H5
LT-H4
LT-H3
0x14
Local-High-Temp-Limit
R/W
0x3C
8 MSBs of upper-bound threshold of out-of-range detection of Local-Temp. 3 LSBs are '0'. Default = +60°C.
LT-L10
LT-L9
LT-L8
LT-L7
LT-L6
LT-L5
LT-L4
LT-L3
0x15
Local-Low-Temp-Limit
R/W
0x00
8 MSBs of lower-bound threshold of the out-of-range detection of Local-Temp. 3 LSBs are '0'. Default = 0°C.
0x16
Local-THERM-Limit
LT-T10
LT-T9
LT-T8
LT-T7
LT-T6
LT-T5
LT-T4
LT-T3
R/W
0x46 _{8 MSBs of local THERM temperature limit. 3 LSBs are '0'. When local temperature is equal to or above this limit,}
L-THERM is detected. Default = +70°C.
0x18 Remote-High-Temp-Limit R/W
0x50
RT-H10
RT-H9
RT-H8
RT-H7
RT-H6
RT-H5
RT-H4
RT-H3
The 8 MSBs of the upper-bound threshold of the out-of-range detection of Remote-Temp. 3 LSBs are '0'. Default = +80°C.
0x19 Remote-Low-Temp-Limit R/W
0x00
RT-L10
RT-L9
RT-L8
RT-L7
RT-L6
RT-L5
RT-L4
RT-L3
The 8 MSBs of the lower-bound threshold of the out-of-range detection of Remote-Temp. 3 LSBs are '0'. Default = 0°C.
RT-T10
RT-T9
RT-T8
RT-T7
RT-T6
RT-T5
RT-T4
RT-T3
0x1A
Remote-THERM-Limit
R/W
0x64 _{8 MSBs of Remote THERM temperature limit. 3 LSBs are '0'. When remote temperature is equal to or above this limit,}
R-THERM is detected. Default = +100°C.
0x1B
Local-Critical-Temp
LT-C10
LT-C9
LT-C8
LT-C7
LT-C6
LT-C5
LT-C4
LT-C3
R/W
0x50 _{The 8 MSBs of Local Critical temperature shutdown threshold. 3 LSBs are '0'. When the Local-Temp is equal to or above}
this limit, the LTC interrupt occurs and OVR goes low. Default = +80°C.
Copyright © 2009, Texas Instruments Incorporated
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