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LM64 Datasheet(PDF) 22 Page - National Semiconductor (TI) |
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LM64 Datasheet(HTML) 22 Page - National Semiconductor (TI) |
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22 / 29 page  2.0 LM64 Registers (Continued) Local Temperature And Local High Setpoint Registers ADDRESS Hex Read/ Write Bits POR Value Name Description 00 HEX LOCAL TEMPERATURE REGISTER (8-bits) 00 Read Only 7:0 N/A Local Temperature Reading (8-bit) 8-bit temperature of the LM64. 05 (0B) HEX LOCAL HIGH SETPOINT REGISTER (8-bits) 05 R/W 7:0 0x46 (70˚) Local HIGH Setpoint High Setpoint for the internal diode. Remote Diode Temperature, Offset And Setpoint Registers ADDRESS Hex Read/ Write Bits POR Value Name Description 01 Read Only 7:0 N/A Remote Diode Temperature Reading (MSB) This is the MSB of the LM64 remote diode temperature value, 2’s complement. Bit 7 is the sign bit, bit 6 has a weight 64˚C, and bit 0 has a weight of 1˚C. Read this byte first. The actual remote diode temperature is 16˚C higher than the values in registers 0x01 and 0x10. 10 Read Only 7:5 N/A Remote Diode Temperature Reading (LSB) This is the LSB of the LM64 remote diode temperature value, in 2’s complement. Bit 7 has a weight 0.5˚C, bit 6 has a weight of 0.25˚C, and bit 5 has a weight of 0.125˚C. The actual remote diode temperature is 16˚C higher than the values in registers 0x01 and 0x10. 4:0 00 Always 00. 11 R/W 7:5 00 Remote Temperature OFFSET (MSB) These registers contain the offset value added to, or subtracted from, the remote diode’s reading to compensate for the different non-ideality factors of different processors, diodes, etc. The 2’s complement value, in these registers is added to the output of the LM64’s ADC to form the temperature reading contained in registers 01 and 10. 12 R/W 7:5 00 Remote Temperature OFFSET (LSB) 4:0 00 Always 00. 07 (0D) R/W 7:0 0x46 (70˚C) Remote HIGH Setpoint (MSB) High setpoint temperature for remote diode. Same format as Remote Temperature Reading (registers 01 and 10). 13 R/W 7:5 00 Remote HIGH Setpoint (LSB) 4:0 00 Always 00. 08 (0E) R/W 7:0 00 (0˚C) Remote LOW Setpoint (MSB) Low setpoint temperature for remote diode. Same format as Remote Temperature Reading (registers 01 and 10). 14 R/W 7:5 00 Remote LOW Setpoint (LSB) 4:0 00 Always 00. 19 R/W 7:0 0x55 (85˚C) Remote Diode T_CRIT Limit This 8-bit integer storing the T_CRIT limit is initially 85˚C (101˚C actual remote T_Crit limit). This value can be changed at any time after power-up. 21 R/W 7:0 0x0A (10˚C) Remote Diode T_CRIT Hysteresis 8-bit integer storing T_CRIT hysteresis. T_CRIT stays activated until the remote diode temperature goes below [(T_CRIT Limit) — (T_CRIT Hysteresis)]. BF R/W 7:3 00000 These bits are unused and should always set to 0. 2:1 00 Remote Diode Temperature Filter 00: Filter Disabled 01: Filter Level 1 (minimal filtering, same as 10) 10: Filter Level 1 (minimal filtering, same as 01) 11: Filter Level 2 (maximum filtering) 00 Comparator Mode 0: the ALERT pin functions as an Interrupt or ARA mode. 1: the ALERT pin behaves as a comparator, asserting itself when an ALERT condition exists, de-asserting itself when the ALERT condition goes away. www.national.com 22 |
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