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DS1821S+T Datasheet(PDF) 4 Page - Maxim Integrated Products |
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DS1821S+T Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 19 page DS1821 4 of 19 TEMPERATURE MEASURING CIRCUITRY Figure 2 OPERATING MODES The DS1821 has two operating modes: 1-Wire mode and thermostat mode. The power-up operating mode is determined by the user-programmable T/R ¯ bit in the status/configuration register: if T/R¯ = 0 the device powers-up in 1-Wire mode, and if T/R ¯ = 1 the device powers-up in thermostat mode. The T/R¯ bit is stored in nonvolatile memory (EEPROM), so it will retain its value when the device is powered down. 1-Wire MODE The DS1821 arrives from the factory in 1-Wire mode (T/R ¯ = 0). In this mode, the DQ pin of the DS1821 is configured as a 1-Wire port for communication with a microprocessor using the protocols described in the 1-Wire BUS SYSTEM section of this datasheet. These communications can include reading and writing the high and low thermostat trip-point registers (TH and TL) and the configuration register, and reading the temperature, counter, and slope accumulator registers. Also in this mode, the microprocessor can initiate and stop temperature measurements as described in the OPERATION – MEASURING TEMPERATURE section of this datasheet. The TH and TL registers and certain bits (THF, TLF, T/R ¯, POL and 1SHOT) in the status/configuration register are stored in nonvolatile EEPROM memory, so they will retain data when the device is powered down. This allows these registers to be pre-programmed when the DS1821 is to be used as a standalone thermostat. Writes to these nonvolatile registers can take up to 10ms. To avoid data corruption, no writes to nonvolatile memory should be initiated while a write to nonvolatile memory is in progress. SLOPE ACCUMULATOR PRESET COMPARE LOW TEMPERATURE COEFFICIENT OSCILLATOR COUNTER PRESET =0 TEMPERATURE REGISTER HIGH TEMPERATURE COEFFICIENT OSCILLATOR COUNTER =0 INC STOP SET/CLEAR LSB |
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