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MAX31722MUA+ Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX31722MUA+ Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 15 page Digital Thermometers and Thermostats with SPI/3-Wire Interface 8 Figure 5. Temperature, THIGH, and TLOW Register Format Measuring Temperature The core of the devices’ functionality is its direct-to-digital temperature sensor. The devices measure temperature through the use of an on-chip temperature measure- ment technique with a -55NC to +125NC operating range. The devices power up in a power-conserving shutdown mode. After power-up, the devices can be placed in a continuous conversion mode or in a one-shot conver- sion mode. In the continuous conversion mode, the devices continuously compute the temperature and store the most recent result in the temperature register at addresses 01h (LSB) and 02h (MSB). As conversions are performed in the background, reading the temperature register does not affect the conversion in progress. The temperature value is not updated until the SPI or 3-wire interface is inactive. In other words, CE must be inactive for the temperature register to be updated with the most recent temperature conversion value. In the one-shot conversion mode, the devices perform one temperature conversion and then return to the shutdown mode, storing temperature in the temperature register. This conversion mode is ideal for power-sensitive applications. Details on how to change the setting after power-up are contained in the Programming section. The resolution of the temperature conversion is con- figurable (9, 10, 11, or 12 bits) with 9 bits reading the default state. This equates to a temperature resolution of 0.5NC, 0.25NC, 0.125NC, or 0.0625NC. Following each conversion, thermal data is stored in the temperature register in two’s complement format. The information can be retrieved over the SPI or 3-wire interface with the address set to the temperature register, 01h (LSB) and then 02h (MSB). Table 1 describes the exact relation- ship of output data to measured temperature. Table 1 assumes the devices are configured for 12-bit resolution. If the devices are configured in a lower resolution mode, those bits contain zeros. The data is transmitted serially over the digital interface, MSB first for SPI communica- tion and LSB first for 3-wire communication. The MSB of the temperature register contains the sign (S) bit, denot- ing whether the temperature is positive or negative. Table 1. 12-Bit Resolution Temperature/Data Relationship S 26 25 24 23 22 21 20 02h MSB (UNITS = NC) LSB 2-1 2-2 2-3 2-4 0 0 0 0 01h TEMPERATURE (NC) DIGITAL OUTPUT (BINARY) DIGITAL OUTPUT (HEX) +125 0111 1101 0000 0000 7D00 +25.0625 0001 1001 0001 0000 1910 +10.125 0000 1010 0010 0000 0A20 +0.5 0000 0000 1000 0000 0080 0 0000 0000 0000 0000 0000 -0.5 1111 1111 1000 0000 FF80 -10.125 1111 0101 1110 0000 F5E0 -25.0625 1110 0110 1111 0000 E6F0 -55 1100 1001 0000 0000 C900 |
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