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TMP275AIDGKTG4 Folha de dados(PDF) 5 Page - Texas Instruments |
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TMP275AIDGKTG4 Folha de dados(HTML) 5 Page - Texas Instruments |
5 / 19 page TMP275 SBOS363D − JUNE 2006 − REVISED AUGUST 2007 www.ti.com 5 APPLICATIONS INFORMATION The TMP275 is a digital temperature sensor that is optimal for thermal management and thermal protection applications. The TMP275 is Two-Wire and SMBus interface-compatible, and is specified over a temperature range of −40 °C to +125°C. The TMP275 requires no external components for operation except for pull-up resistors on SCL, SDA, and ALERT, although a 0.1 µF bypass capacitor is recommended, as shown in Figure 1. TMP275 0.1 µF V+ GND 4 3 7 8 ALERT (Output) A 0 6 A 1 5 A 2 2 1 SCL SDA To Two−Wire Controller NOTE:SCL,SDA,and ALERT pins require pull−up resistors. Figure 1. Typical Connections of the TMP275 The sensing device of the TMP275 is the chip itself. Thermal paths run through the package leads as well as the plastic package. The lower thermal resistance of metal causes the leads to provide the primary thermal path. To maintain accuracy in applications requiring air or surface temperature measurement, care should be taken to isolate the package and leads from ambient air temperature. A thermally-conductive adhesive will assist in achieving accurate surface temperature measurement. POINTER REGISTER Figure 2 shows the internal register structure of the TMP275. The 8-bit Pointer Register of the devices is used to address a given data register. The Pointer Register uses the two LSBs to identify which of the data registers should respond to a read or write command. Table 1 identifies the bits of the Pointer Register byte. Table 2 describes the pointer address of the registers available in the TMP275. Power-up reset value of P1/P0 is 00. P7 P6 P5 P4 P3 P2 P1 P0 0 0 0 0 0 0 Register Bits Table 1. Pointer Register Byte I/O Control Interface SCL SDA Temperature Register Configuration Register T LOW Register T HIGH Register Pointer Register Figure 2. Internal Register Structure of the TMP275 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) Table 2. Pointer Addresses of the TMP275 TEMPERATURE REGISTER The Temperature Register of the TMP275 is a 12-bit, read-only register that stores the output of the most recent conversion. Two bytes must be read to obtain data, and are described in Table 3 and Table 4. Note that byte 1 is the most significant byte, followed by byte 2, the least significant byte. The first 12 bits are used to indicate temperature, with all remaining bits equal to zero. The least significant byte does not have to be read if that information is not needed. 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. D7 D6 D5 D4 D3 D2 D1 D0 T11 T10 T9 T8 T7 T6 T5 T4 Table 3. Byte 1 of Temperature Register D7 D6 D5 D4 D3 D2 D1 D0 T3 T2 T1 T0 0 0 0 0 Table 4. Byte 2 of Temperature Register |
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