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TMP121AQDBVREP датащи(PDF) 6 Page - Texas Instruments |
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TMP121AQDBVREP датащи(HTML) 6 Page - Texas Instruments |
6 / 13 page www.ti.com TEMPERATURE REGISTER COMMUNICATING WITH THE TMP121 0.25s 0.5s 50 µA (active) 20 µA (idle) TMP121-EP TMP123-EP SGLS315 – SEPTEMBER 2005 APPLICATION INFORMATION (continued) The temperature register of the TMP121 and TMP123 is a 16 bit, signed read-only register that stores the output of the most recent conversion. Up to 16 bits can be read to obtain data and are described in Table 1. The first 13 bits are used to indicate temperature with bits D2 = 0 and D1, D0 in a high impedance state. Data format for temperature is summarized in Table 2. Following power-up or reset, the temperature register reads 0 °C until the first conversion is complete. Table 1. 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 0 Z Z Table 2. Temperature Data Format TEMPERATURE DIGITAL OUTPUT(1) HEX ( °C) (BINARY) 150 0100 1011 0000 0000 4B00 125 0011 1110 1000 0000 3E80 25 0000 1100 1000 0000 0C80 0.0625 0000 0000 0000 1000 0008 0 0000 0000 0000 0000 0000 –0.0625 1111 1111 1111 1000 FFF8 –25 1111 0011 1000 0000 F380 –55 1110 0100 1000 0000 E480 (1) The last two bits are high impedance and are shown as 00 in the table. The TMP121 and TMP123 continuously convert temperatures to digital data while CS is high. CS must be high for a minimum of one conversion time (320 ms max) to update the temperature data. Reading temperature data from the TMP121 and TMP123 is initiated by pulling CS low, which causes any conversion in progress to terminate, and places the device into analog shutdown. Quiescent current is reduced to 1 µA during analog shutdown. 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. The TMP121 and TMP123 typically require 0.25 s to complete a conversion and consume 50 µA of current during this period. If CS is held high for longer than one conversion time period the TMP121 and TMP123 goes into idle mode for 0.25 s, requiring only 20 µA of current. A new conversion begins every 0.5 s. Figure 6 describes the conversion timing for the TMP121 and TMP123. Figure 6. Conversion Time and Period The serial data of the TMP121 and TMP123 consists of 12-bit plus sign temperature data followed by a confirmation bit and two high impedance bits. Data is transmitted in binary two's complement format. Figure 7 describes the output data of the TMP121 and TMP123. 6 |
Аналогичный номер детали - TMP121AQDBVREP |
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Аналогичное описание - TMP121AQDBVREP |
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