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TMP123 Scheda tecnica(PDF) 5 Page - Texas Instruments |
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TMP123 Scheda tecnica(HTML) 5 Page - Texas Instruments |
5 / 10 page TMP125 SBOS323 − DECEMBER 2004 www.ti.com 5 APPLICATIONS The TMP125 10-bit, read-only digital temperature sensor is optimal for thermal management and thermal protection applications. The TMP125 is specified for a temperature range of −40 °C to +125°C, with operation extending down to −55 °C. It is specified for a supply voltage range of 2.7V to 5.5V, and also features a hardware shutdown to provide power savings. Quiescent current is reduced to 1 µA during analog shutdown. The TMP125 communicates through a serial interface that is SPI-compatible. Temperature is converted to a 10-bit data word with 0.25 °C resolution. The TMP125 is optimal for low power applications, with a 120ms conversion period for reduced power consumption. The sensing device of the TMP125 is the chip itself. Thermal paths run through the package leads as well as the plastic package, and the lower thermal resistance of metal causes the leads to provide the primary thermal path. The TMP125 requires no external components for operation, though a 0.1 µF supply bypass capacitor is recommended. Figure 1 shows typical connection for the TMP125. TMP125 0.1 µF V+ 1 5 2 3 CS SI 4 6 SCK SO Figure 1. Typical Connections for the TMP125 COMMUNICATING WITH THE TMP125 The TMP125 continuously converts temperatures to digital data. Temperature data is read by pulling CS low. Once CS is pulled low, temperature data from the last completed conversion prior to dropping CS is latched into the shift register and clocked out at SO on the falling SCK edge. The 16-bit data word is clocked out sign bit first, followed by the MSB. Any portion of the 16-bit word can be read before raising CS. However, all 16 bits must be clocked to allow shutdown of the TMP125. The TMP125 typically requires 60ms to complete a conversion, with results updated every 120ms. The TMP125 will go into idle mode for 60ms, requiring only 20 µA of current. A new conversion begins every 120ms. Figure 2 describes the conversion timing for the TMP125. TEMPERATURE REGISTER The Temperature Register of the TMP125 is a 16-bit, read-only register that stores the output of the most recent conversion. However, temperature is represented by only 10-bits, which are in signed two’s complement format. The first bit of the Temperature Register, D15, is a leading zero. Bits D14 and D5 are used to indicate temperature. Bits D4 to D0 are the same as D5. (See Table 1.) Data format for temperature is summaraized in Table 2. When calculating the signed two’s complement temperature value, be sure to use only the 10 data bits. Following power-up or reset, the Temperature Register will read 0 °C until the first conversion is complete. D15 D14 D13 D12 D11 D10 D9 D8 0 T9 T8 T7 T6 T5 T4 T3 D7 D6 D5 D4 D3 D2 D1 D0 T2 T1 T0 T0 T0 T0 T0 T0 Table 1. Temperature Register TEMPERATURE ( °C) DIGITAL OUTPUT D14...D5 +127 01 1111 1100 +125 01 1111 0100 +100 01 1001 0000 +75 01 0010 1100 +50 00 1100 1000 +25 00 0110 0100 +10 00 0010 1000 +0.25 00 0000 0001 0 00 0000 0000 −0.25 11 1111 1111 −25 11 1001 1100 −50 11 0011 1000 −55 11 0010 0100 Table 2. Temperature Data Format |
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