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DS1721S Datasheet(PDF) 6 Page - Maxim Integrated Products |
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DS1721S Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 17 page DS1721 6 of 17 R0, R1 = Thermometer Resolution Bits. Table 3 below defines the resolution of the digital thermometer, based on the settings of these two bits. There is a direct tradeoff between resolution and conversion time, as depicted in the DC Electrical Characteristics: Digital Thermometer table. The designer has read/write access to R0 and R1, and the default state is R0="1" and R1="1" (12-bit conversions). THERMOMETER RESOLUTION CONFIGURATION Table 3 R1 R0 THERMOMETER RESOLUTION MAX CONVERSION TIME 0 0 9-BIT 93.75ms 0 1 10-BIT 187.5ms 1 0 11-BIT 375ms 1 1 12-BIT 750ms X = Undefined. These bits are used internally by the DS1721. DONE = Temperature Conversion Status Bit. "1" = conversion complete and "0" = conversion in progress. The DONE bit is read-only, and the power-up state is "1". In the continuous conversion mode, DONE = "0". Thermostat Setpoints Programming The thermostat registers (TH and TL) define the setpoints for operation of the TCOM output. The respective register can be accessed over the 2-wire bus via the Access TH (A1h) or Access TL (A2h) commands. Reading from or writing to the respective register is controlled by the state of the R/ W bit in the 2-wire control byte (See “2-Wire Serial Data Bus” section). The format of the TH and TL registers is a 12-bit 2’s complement representation of the temperature in °C. The user can program the number of bits (9, 10, 11, or 12) for each TH and TL that correspond to the thermometer resolution configuration chosen. If the 9-bit mode is chosen, for example, the 3 least significant bits of TH and TL will be ignored by the thermostat comparator. The format for both TH and TL is shown in Figure 4. The power-up default of TH is 80°C and that for TL is 75°C. TEMPERATURE/DATA RELATIONSHIPS Figure 4 S 26 25 24 23 22 21 20 MSB MSb (UNIT = °C) LSb 2-1 2-2 2-3 2-4 0 0 0 0 LSB TEMP DIGITAL OUTPUT (Binary) DIGITAL OUTPUT (Hex) +80°C 0101 0000 0000 0000 5000h +75°C 0100 1011 0000 0000 4B00h +10.125°C 0000 1010 0010 0000 0A20h +0.5°C 0000 0000 1000 0000 0080h +0°C 0000 0000 0000 0000 0000h -0.5°C 1111 1111 1000 0000 FF80h -10.125°C 1111 0101 1110 0000 F5E0h -25.0625°C 1110 0110 1111 0000 E6F0h -55°C 1100 1001 0000 0000 C900h |
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