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TMP102AIDRLR 데이터시트(PDF) 6 Page - Burr-Brown (TI) |
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TMP102AIDRLR 데이터시트(HTML) 6 Page - Burr-Brown (TI) |
6 / 19 page www.ti.com TEMPERATURE REGISTER TMP102 SBOS397 – AUGUST 2007 complete. Bit D0 of byte 2 indicates Normal mode (EM bit = '0') or Extended mode (EM bit = '1') and The Temperature Register of the TMP102 is can be used to distinguish between the two configured as a 12-bit, read-only register temperature register data formats. The unused bits in (Configuration Register EM bit = '0', see the the Temperature Register always read '0'. Extended Mode section), or as a 13-bit, read-only register (Configuration Register EM bit = '1') that Table 3. Byte 1 of Temperature Register(1) stores the output of the most recent conversion. Two D7 D6 D5 D4 D3 D2 D1 D0 bytes must be read to obtain data, and are described in Table 3 and Table 4. Note that byte 1 is the most T11 T10 T9 T8 T7 T6 T5 T4 significant byte, followed by byte 2, the least (T12) (T11) (T10) (T9) (T8) (T7) (T6) (T5) significant byte. The first 12 bits (13 bits in Extended (1) Extended mode 13-bit configuration shown in parenthesis. mode) are used to indicate temperature. The least significant byte does not have to be read if that Table 4. Byte 2 of Temperature Register(1) information is not needed. The data format for temperature is summarized in Table 5 and Table 6. D7 D6 D5 D4 D3 D2 D1 D0 One LSB equals 0.0625 °C. Negative numbers are T3 T2 T1 T0 0 0 0 0 represented in binary two's complement format. (T4) (T3) (T2) (T1) (T0) (0) (0) (1) Following power-up or reset, the Temperature (1) Extended mode 13-bit configuration shown in parenthesis. Register will read 0 °C until the first conversion is Table 5. 12-Bit Temperature Data Format(1) TEMPERATURE ( °C) DIGITAL OUTPUT (BINARY) HEX 128 0111 1111 1111 7FF 127.9375 0111 1111 1111 7FF 100 0110 0100 0000 640 80 0101 0000 0000 500 75 0100 1011 0000 4B0 50 0011 0010 0000 320 25 0001 1001 0000 190 0.25 0000 0000 0100 004 0 0000 0000 0000 000 –0.25 1111 1111 1100 FFC –25 1110 0111 0000 E70 –55 1100 1001 0000 C90 (1) The resolution for the Temp ADC in Internal Temperature mode is 0.0625 °C/count. For positive temperatures (for example, +50 °C): Two's complement is not performed on positive numbers. Therefore, simply convert the number to binary code with the 12-bit, left-justified format, and MSB = 0 to denote a positive sign. Example: (+50 °C)/(0.0625°C/count) = 800 = 320h = 0011 0010 0000 For negative temperatures (for example, –25 °C): Generate the Two's Complement of a negative number by complementing the absolute value binary number and adding 1. Denote a negative number with MSB = 1. Example: (|–25 °C|)/(0.0625°C/count) = 400 = 190h = 0001 1001 0000 Two's complement format: 1110 0110 1111 + 1 = 1110 0111 0000 6 Submit Documentation Feedback |
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