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DS1631U+ Datasheet(PDF) 8 Page - Maxim Integrated Products |
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DS1631U+ Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 15 page DS1631/DS1631A/DS1731 8 of 15 provides user access to the temperature register. Bits 3 through 0 of the temperature register are hardwired to 0. When the device is configured for 12-bit resolution, the 12 MSbs (bits 15 through 4) of the temperature register contain temperature data. For 11-bit resolution, the 11 MSbs (bits 15 through 5) of the temperature register contain data, and bit 4 is 0. Likewise, for 10-bit resolution, the 10 MSbs (bits 15 through 6) contain data, and for 9-bit the 9 MSbs (bits 15 through 7) contain data, and all unused LSbs contain 0s. Table 4 gives examples of 12-bit resolution output data and the corresponding temperatures. Figure 4. TEMPERATURE, TH, AND TL REGISTER FORMAT bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 MS Byte S 2 6 2 5 2 4 2 3 2 2 2 1 2 0 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 LS Byte 2 -1 2 -2 2 -3 2 -4 0 0 0 0 Table 4. 12-BIT RESOLUTION TEMPERATURE/DATA RELATIONSHIP TEMPERATURE ( °C) DIGITAL OUTPUT (BINARY) DIGITAL OUTPUT (HEX) +125 0111 1101 0000 0000 7D00h +25.0625 0001 1001 0001 0000 1910h +10.125 0000 1010 0010 0000 0A20h +0.5 0000 0000 1000 0000 0080h 0 0000 0000 0000 0000 0000h -0.5 1111 1111 1000 0000 FF80h -10.125 1111 0101 1110 0000 F5E0h -25.0625 1110 0110 1111 0000 E6F0h -55 1100 1001 0000 0000 C900h OPERATION—THERMOSTAT FUNCTION The thermostat output (TOUT) is updated after every temperature conversion, based on a comparison between the measured digital temperature and user-defined upper and lower thermostat trip points. TOUT remains at the updated value until the next conversion completes. When the measured temperature meets or exceeds the value stored in the upper trip-point register (TH), TOUT becomes active and remains active until the measured temperature falls below the value stored in the lower trip-point register (TL) (see Figure 5). This allows the user to program any amount of hysteresis into the output response. The active state of TOUT is user-programmable through the polarity bit (POL) in the configuration register. The user-defined values in the TH and TL registers (see Figure 4) must be in two’s complement format with the MSb (bit 15) containing the sign bit (S). The TH and TL resolution is determined by the R0 and R1 bits in the configuration register (see Table 6), so the TH and TL resolution matches the output temperature resolution. For example, for 10-bit resolution bits 5 through 0 of the TH and TL registers read out as 0 (even if 1s are written to these bits), and the converted temperature is compared to the 10 MSbs of TH and TL. The TH and TL registers are stored in EEPROM; therefore, they are NV and can be programmed prior to device installation. Writing to and reading from the TH and TL registers is achieved using the Access TH |
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