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TMP122AMDBVTEP Folha de dados(PDF) 8 Page - Texas Instruments |
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TMP122AMDBVTEP Folha de dados(HTML) 8 Page - Texas Instruments |
8 / 17 page TEMPERATURE REGISTER CONFIGURATION REGISTER SHUTDOWN MODE (SD) TMP122-EP SBOS454 – NOVEMBER 2008 .......................................................................................................................................................................................... www.ti.com Table 3. Pointer Addresses P1 P0 REGISTER 0 0 Temperature Register (READ only) 0 1 Configuration Register (READ/WRITE) 1 0 TLOW Register (READ/WRITE) 1 1 THIGH Register (READ/WRITE) The Temperature Register of the TMP122 is a 16-bit, signed read-only register that stores the output of the most recent conversion. The TMP122 is specified for the temperature range of -55°C to 125°C with operation from -55°C to 150°C. Up to 16 bits can be read to obtain data and are described in Table 4. The first 13 bits are used to indicate temperature where bit D2 is 1, and D1, D0 are in a high impedance state. Data format for temperature is summarized in Table 5. Following power-up or reset, the Temperature Register will read 0°C until the first conversion is complete. Table 4. Temperature Register D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 T12 T11 T10 T9 T8 T7 T6 T5 T4 T3 T2 T1 T0 1 Z Z Table 5. Temperature Data Format TEMPERATURE DIGITAL OUTPUT(1) HEX (°c) (BINARY) 150 0100 1011 0000 0111 4B07 125 0011 1110 1000 0111 3E87 25 0000 1100 1000 0111 0C87 0.0625 0000 0000 0000 1111 000F 0 0000 0000 0000 0111 0007 -0.0625 1111 1111 1111 1111 FFFF -25 1111 0011 1000 0111 F387 -55 1110 0100 1000 0111 E487 (1) The last two bits are high impedance and are shown as 11 in the table. The user can obtain 9, 10, 11, or 12 bits of resolution by addressing the Configuration Register and setting the resolution bits accordingly. For 9-, 10-, or 11-bit resolution, the most significant bits in the Temperture Register are used with the unused LSBs set to zero. The Configuration Register is a 16-bit read/write register used to store bits that control the operational modes of the temperature sensor. Read/write operations are performed MSB first. The format of the Configuration Register for the TMP122 is shown in Table 6, followed by a break-down of the register bits. The power-up/reset value of the Configuration Register bits R1/R0 equal 1/1, all other bits equal zero. Table 6. Configuration Register D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 D1 D0 R1 R0 F1 F0 POL TM1 TM0 0 1 0 The Shutdown Mode of the TMP122 can be used to shut down all device circuitry except the serial interface. Shutdown mode occurs when the last 8 bits of the WRITE command are equal to 1, and will occur once the current conversion is completed, reducing current consumption to less than 1 µA. To take the part out of shutdown, send any command or pattern after the 16-bit read with the last 8 bits not equal to one. Power on default is in active mode. 8 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TMP122-EP |
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