Datasheet

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TEMPERATURE LIMIT REGISTERS

AMC6821

SBAS386C – MAY 2006 – REVISED JULY 2007

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.

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.

Product Folder Link(s): AMC6821