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DS18B20-PAR Datasheet(PDF) 4 Page - Maxim Integrated Products |
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DS18B20-PAR Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 19 page DS18B20-PAR 4 of 19 resolution, bits 1 and 0 are undefined, and for 9-bit resolution bits 2, 1 and 0 are undefined. Table 2 gives examples of digital output data and the corresponding temperature reading for 12-bit resolution conversions. TEMPERATURE REGISTER FORMAT Figure 3 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 LS Byte 2 3 2 2 2 1 2 0 2 -1 2 -2 2 -3 2 -4 bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 MS Byte S S S S S 2 6 2 5 2 4 TEMPERATURE/DATA RELATIONSHIP Table 2 TEMPERATURE DIGITAL OUTPUT (Binary) DIGITAL OUTPUT (Hex) +85°C* 0000 0101 0101 0000 0550h +25.0625°C 0000 0001 1001 0001 0191h +10.125°C 0000 0000 1010 0010 00A2h +0.5°C 0000 0000 0000 1000 0008h 0°C 0000 0000 0000 0000 0000h -0.5°C 1111 1111 1111 1000 FFF8h -10.125°C 1111 1111 0101 1110 FF5Eh -25.0625°C 1111 1110 0110 1111 FE6Fh -55°C 1111 1100 1001 0000 FC90h *The power-on reset value of the temperature register is +85°C OPERATION – ALARM SIGNALING After the DS18B20-PAR performs a temperature conversion, the temperature value is compared to the user-defined two’s complement alarm trigger values stored in the 1-byte TH and TL registers (see Figure 4). The sign bit (S) indicates if the value is positive or negative: for positive numbers S = 0 and for negative numbers S = 1. The TH and TL registers are nonvolatile (EEPROM) so they will retain data when the device is powered down. TH and TL can be accessed through bytes 2 and 3 of the scratchpad as explained in the MEMORY section of this datasheet. TH AND TL REGISTER FORMAT Figure 4 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 S 2 6 2 5 2 4 2 3 2 2 2 1 2 0 Only bits 11 through 4 of the temperature register are used in the TH and TL comparison since TH and TL are 8-bit registers. If the result of a temperature measurement is higher than or equal to TH or lower than or equal to TL, an alarm condition exists and an alarm flag is set inside the DS18B20-PAR. This flag is updated after every temperature measurement; therefore, if the alarm condition goes away, the flag will be turned off after the next temperature conversion. |
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