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DS1626 Datasheet(PDF) 8 Page - Dallas Semiconductor |
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DS1626 Datasheet(HTML) 8 Page - Dallas Semiconductor |
8 / 14 page DS1626/DS1726 8 of 14 Table 4. 12-BIT RESOLUTION TEMPERATURE/DATA RELATIONSHIP TEMPERATURE ( °C) DIGITAL OUTPUT (BINARY) DIGITAL OUTPUT (HEX) +125 0111 1101 0000 7D0h +25.0625 0001 1001 0001 191h +10.125 0000 1010 0010 0A2h +0.5 0000 0000 1000 008h 0 0000 0000 0000 000h -0.5 1111 1111 1000 FF8h -10.125 1111 0101 1110 F5Eh -25.0625 1110 0110 1111 E6Fh -55 1100 1001 0000 C90h OPERATION—THERMOSTAT FUNCTION The DS1626/DS1726 thermostat outputs (THIGH, TLOW, and TCOM) are updated after every temperature conversion and remain at the updated values until the next conversion completes. THIGH is asserted when the measured temperature is higher than or equal to the value stored in the TH register, and TLOW is asserted when the temperature is equal to or falls below the value in the TL register (see Figure 5). TCOM uses both TH and TL to provide programmable hysteresis: when the measured temperature equals or exceeds TH, TCOM is asserted and it remains asserted until the temperature falls to a value equal to or below TL. All three thermostat outputs are active-high outputs. The Write TH and Write TL commands are used to program the 12-bit TH and TL registers with user- defined two’s complement values. The MSb (bit 11) of each register contains the two’s complement sign bit (S). For the TCOM thermostat output to function correctly, the TL value must be less than the TH value. Any unused LSbs in the TH and TL registers are forced to 0 regardless of the data written to those bits. The unused LSbs are determined by the conversion resolution set by R1 and R0 in the configuration register. Therefore, for 9-bit conversions bits 2 through 0 will be 0, for 10-bit conversions bit 1 and bit 0 will be 0, and for 11-bit conversions bit 0 will be 0. All bits are used for 12- bit conversions, so no bits are forced to 0. However, regardless of the conversion resolution, when writing to TH or TL at least 12 bits must be sent following the Write TH or Write TL commands. The reason is that data written to TH and TL is not saved to EEPROM until the DS1626/DS1726 have received 12 bits, so if the operation is terminated before 12 bits have been received, the data will be lost. Any additional bits sent after the first twelve are ignored (e.g., if two 8-bit words are written). Another DS1626/DS1726 thermostat feature is the temperature-high flag (THF) and temperature-low flag (TLF) in the configuration register. These bits provide a record of whether the temperature has been greater than or equal to TH or less than or equal to TL at any time since the DS1626/DS1726 were powered up. If the temperature is greater than or equal to the TH register value, the THF bit in the configuration register will be set to 1. If the temperature is less than or equal to the TL register value, the TLF bit in the configuration register will be set to 1. Once THF and/or TLF has been set, it will remain set until the user overwrites it with a 0 or until the power is cycled. |
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