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TCM1617 Datasheet(PDF) 11 Page - Microchip Technology |
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TCM1617 Datasheet(HTML) 11 Page - Microchip Technology |
11 / 14 page 11 TCM1617 TCM1617-1 2/5/99 2001 Microchip Technology Inc. DS21485A SMBus Thermal Sensor with External Diode Input Temperature Registers, 8-Bits, Read-Only (INT_TEMP, EXT_TEMP) The binary value (2’s complement format) in these two registers represents temperature of the internal and external sensors following a conversion cycle. The registers are automatically updated in an alternating manner. Internal Temperature Register (INT_TEMP) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB x x x x x x LSB External Temperature Register (EXT_TEMP) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB x x x x x x LSB Temperature Threshold Setpoint Registers, 8-Bits, Read-Write (INT_HLIM, INT_LLIM, EXT_HLIM, EXT_LLIM) These registers store the values of the upper and lower temperature setpoints for event detection. The value is in 2’s-complement binary. INT_HLIM and INT_LLIM are com- pared with the INT_TEMP value, and EXT_HLIM and EXT_LLIM are compared with EXT_TEMP. These registers may be written at any time. Internal High Limit Setpoint Register (INT_HLIM) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB x x x x x x LSB Internal Low Limit Setpoint Register (INT_LLIM) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB x x x x x x LSB External High Limit Setpoint Register (EXT_HLIM) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB x x x x x x LSB External Low Limit Setpoint Register (EXT_LLIM) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB x x x x x x LSB NOTE: POR states: INT_HLIM 01111111b +127 °C INT_LLIM 11001001b –55 °C EXT_HLIM 01111111b +127 °C EXT_LLIM 11001001b –55 °C In the two temperature data and four threshold setpoint registers, each unit value represents one degree (Celsius). The value is in 2’s-complement binary format such that a reading of 00000000b corresponds to 0 °C. Examples of this temperature-to-binary value relationship are shown in the following table. Temperature-to-Digital Value Conversion (INT_TEMP, EXT_TEMP, INT_HLIM, INT_LLIM, EXT_HLIM, EXT_LLIM) Actual Rounded Binary Hex Temperature Temperature Value Value +130.00 °C +127 °C 01111111 7F +127.00 °C +127 °C 01111111 7F +126.50 °C +127 °C 01111111 7F +25.25 °C +25 °C 00011001 19 +0.50 °C+1°C 00000001 01 +0.25 °C0°C 00000000 00 0.00 °C0°C 00000000 00 –0.25 °C0°C 00000000 00 –0.50 °C0°C 00000000 00 –0.75 °C –1 °C 11111111 FF –1.00 °C –1 °C 11111111 FF –25.00 °C –25 °C 11100111 E7 –25.25 °C –25 °C 11100110 E7 –54.75 °C –55 °C 11001001 C9 –55.00 °C –55 °C 11001001 C9 –65.00 °C –65 °C 10111111 BF |
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