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DS1821 Datasheet(PDF) 5 Page - Dallas Semiconductor |
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DS1821 Datasheet(HTML) 5 Page - Dallas Semiconductor |
5 / 16 page DS1821 5 of 16 A status register is also present, indicating the status of the thermostatic control, and allowing configuration of the output polarity as either active high or active low, and establishes the power-up state of the device. The status register is defined as follows: where, DONE = Conversion Done bit. 1 = Conversion complete, 0 = conversion in progress. THF = Temperature High Flag. This bit will normally be 0, but will be set to 1 when the temperature exceeds the value of TH. It will remain 1 until reset by writing 0 into this location. This feature provides a method of determining if the DS1821 has ever been subjected to temperatures above TH. This bit is nonvolatile, and is stored in E2 memory. TLF = Temperature Low Flag. This bit will normally be 0, but will be set to 1 when the temperature is lower than the value of TL. It will remain 1 until reset by writing 0 into this location. This feature provides a method of determining if the DS1821 has ever been subjected to temperatures below TL. This bit is nonvolatile, and is stored in E2 memory. NVB = Nonvolatile memory busy flag. 1 = Write to an E2 memory cell in progress, 0 = nonvolatile memory is not busy. A write to E2 may take up to 10 ms. T/R* = Power-up mode bit. If set to a 1, the DS1821 will power up in a thermostat mode. If set to a 0, the device will power up in 1-Wire “read” mode. This bit is nonvolatile. POL = Output Polarity Bit. 1 = active high, 0 = active low. This bit is nonvolatile. 1SHOT = One-Shot Mode. If 1SHOT is 1, the DS1821 will perform one temperature conversion upon reception of the Start Convert T protocol. If 1SHOT is 0, the DS1821 will continuously perform temperature conversions. Note that the One-Shot mode is available only when the device is in 1-Wire mode. In thermostat mode, the device continuously performs temperature conversions. This bit is nonvolatile. DONE 1 NVB THF TLF T/R POL 1SHOT |
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