AMC6821-Q1 Datasheet, PDF (46/54 Pages) Texas Instruments – INTELLIGENT TEMPERATURE MONITOR AND PWM FAN CONTROLLER

AMC6821-Q1
SBAS475 – JUNE 2009 ...................................................................................................................................................................................................... www.ti.com
Remote-Temp-DATA-HByte Register (Address 0x0B, Value After Power-On or Reset = 0x80, –128°C)
Bit 7 (MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0 (LSB)
RT10 (MSB)
RT9
RT8
RT7
RT6
RT5
RT4
RT3
Bits [RT10:RT3] are the eight MSBs of the newest remote temperature reading.
It is important to note that temperature can be read as an 8-bit value (with 1°C resolution) from the
Temp-DATA-Hbyte register, or as an 11-bit value (with 0.125°C resolution) from the Temp-DATA-LByte and
Temp-DATA-HByte registers. If only 1°C resolution is required, the temperature readings can be read back at
any time and in no particular order. If the 11-bit measurement is required, this involves a two-register read for
each measurement. The Temp-DATA-LByte register (0x06) should be read first. This condition causes all
temperature reading registers to be frozen until the Remote-Temp-DATA-HByte Register (0x0B) is read. This
architecture also prevents an MSB reading from being updated while the 3LSBs are being read, and vice versa.
See the Reading Temperature Data section for details.
TEMPERATURE LIMIT REGISTERS
All temperature limits are 11 bits with three LSBs always '0'. Only eight MSBs need to be set in one register for
each limit.
Local-High-Temp-Limit Register (Address 0x14, Value After Power-On or Reset = 0x3C, +60°C)
Bit 7 (MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0 (LSB)
LT-H10 (MSB)
LT-H9
LT-H8
LT-H7
LT-H6
LT-H5
LT-H4
LT-H3
These bits are the upper bounds of the local temperature.
Local-Low-Temp-Limit Register (Address 0x15, Value After Power-On or Reset = 0x00, 0°C)
Bit 7 (MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0 (LSB)
LT-L10 (MSB)
LT-L9
LT-L8
LT-L7
LT-L6
LT-L5
LT-L4
LT-L3
These bits are the lower bounds of the local temperature.
Local-THERM-Limit Register (Address 0x16, Value After Power-On or Reset = 0x46, +70°C)
Bit 7 (MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0 (LSB)
LT-T10 (MSB)
LT-T9
LT-T8
LT-T7
LT-T6
LT-T5
LT-T4
LT-T3
These bits are the thermal threshold of the local temperature.
Remote-High-Temp-Limit Register (Address 0x18, Value After Power-On or Reset = 0x50, +80°C)
Bit 7 (MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0 (LSB)
RT-H10 (MSB)
RT-H9
RT-H8
RT-H7
RT-H6
RT-H5
RT-H4
RT-H3
These bits are the upper bounds of the remote temperature.
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