Datasheet

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REGISTER MAP
AMC6821
SBAS386C – MAY 2006 – REVISED JULY 2007
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
FAN-Fault-
THERMOVIE FDRC1 FDRC0 PWMINV FANIE INT-EN START
EN
0x00 Configuration Register 1 R/W 0xD4
THERM INT FAN-Fault Global Int
Fan Control Mode PWM Invert RPM Int EN Start Monitor
Enable Pin EN EN
TACH-
RST PSVIE RTOIE LTOIE RTFIE TACH-EN PWM-EN
MODE
0x01 Configuration Register 2 R/W 0x3D
Remote
PWM-Out
Reset LPSV Int EN RT Int EN LT Int EN Failure Int TACH EN TACH Mode
EN
EN
THERM-FAN-
0 0 0 0 0 1 0
EN
0x3F Configuration Register 3 R/W 0x82
THERM-Fan
Part Revision Number
Control
For Future
PSPR TACH-FAST OVREN 1 0 0 0
Use
0x04 Configuration Register 4 R/W 0x08
TACH
Must be Pulse
Reading OVR Pin EN Reserved
rewritten to '1'. Number
Fast
RPM-
LTL LTH RTF R-THERM RTL RTH FANS
ALARM
0x02 Status Register 1 R 0x00
RT Over
LT Low LT High RT Failure RT Low RT High Fan Slow Fan Fast
Therm
THERM-IN L-THERM LPSV LTC RTC 0 0 0
0x03 Status Register 2 R 0x00
LT Over LT Below LT Over RT Over
Therm Input Reserved
Therm Therm Critical Critical
TEMPERATURE MONITORING
LT2 LT1 LT0 0 0 RT2 RT1 RT0
0x06 Temp-DATA-LByte R 0x00
3 LSBs of Local Reading Reserved 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.
LT-T10 LT-T9 LT-T8 LT-T7 LT-T6 LT-T5 LT-T4 LT-T3
0x16 Local-THERM-Limit 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.
RT-H10 RT-H9 RT-H8 RT-H7 RT-H6 RT-H5 RT-H4 RT-H3
0x18 Remote-High-Temp-Limit R/W 0x50
The 8 MSBs of the upper-bound threshold of the out-of-range detection of Remote-Temp. 3 LSBs are '0'. Default = +80 ° C.
RT-L10 RT-L9 RT-L8 RT-L7 RT-L6 RT-L5 RT-L4 RT-L3
0x19 Remote-Low-Temp-Limit R/W 0x00
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.
LT-C10 LT-C9 LT-C8 LT-C7 LT-C6 LT-C5 LT-C4 LT-C3
0x1B Local-Critical-Temp 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.
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