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TMP275AIDGKTG4 データシート(PDF) 6 Page - Texas Instruments |
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TMP275AIDGKTG4 データシート(HTML) 6 Page - Texas Instruments |
6 / 19 page TMP275 SBOS363D − JUNE 2006 − REVISED AUGUST 2007 www.ti.com 6 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 Table 5. Temperature Data Format 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 Temperature Register are used with the unused LSBs set to zero. CONFIGURATION REGISTER The Configuration Register is an 8-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 TMP275 is shown in Table 6, followed by a breakdown of the register bits. The power-up/reset value of the Configuration Register is all bits equal to 0. BYTE D7 D6 D5 D4 D3 D2 D1 D0 1 OS R1 R0 F1 F0 POL TM SD Table 6. Configuration Register Format SHUTDOWN MODE (SD) The Shutdown Mode of the TMP275 allows the user to save maximum power by shutting down all device circuitry other than the serial interface, which reduces current consumption to typically less than 0.1 µA. Shutdown Mode is enabled when the SD bit is 1; the device will shut down once the current conversion is completed. When SD is equal to 0, the device will maintain a continuous conversion state. THERMOSTAT MODE (TM) The Thermostat Mode bit of the TMP275 indicates to the device whether to operate in Comparator Mode (TM = 0) or Interrupt Mode (TM = 1). For more information on comparator and interrupt modes, see the High and Low Limit Registers section. POLARITY (POL) The Polarity Bit of the TMP275 allows the user to adjust the polarity of the ALERT pin output. If POL = 0, the ALERT pin will be active LOW, as shown in Figure 3. For POL = 1, the ALERT pin will be active HIGH, and the state of the ALERT pin is inverted. Measured Temperature T HIG H T LO W TMP275 ALERT PIN (Comparator Mode) POL = 0 TMP275 ALERT PIN (Interrupt Mode) POL = 0 TMP275 ALERT PIN (Comparator Mode) POL = 1 TMP275 ALERT PIN (Interrupt Mode) POL = 1 Read Read Time Read Figure 3. Output Transfer Function Diagrams FAULT QUEUE (F1/F0) A fault condition is defined as when the measured temperature exceeds the user-defined limits set in the THIGH and TLOW Registers. Additionally, the number of fault conditions required to generate an alert may be programmed using the fault queue. The fault queue is provided to prevent a false alert as a result of environmental noise. The fault queue requires consecutive fault measurements in order to trigger the alert function. Table 7 defines the number of measured faults that may be programmed to trigger an alert condition in the device. For THIGH and TLOW register format and byte order, see section High and Low Limit Registers. F1 F0 CONSECUTIVE FAULTS 0 0 1 0 1 2 1 0 4 1 1 6 Table 7. Fault Settings of the TMP275 |
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