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TMP108AIYFFT データシート(PDF) 8 Page - Texas Instruments |
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TMP108AIYFFT データシート(HTML) 8 Page - Texas Instruments |
8 / 19 page TMP108 SBOS663 – APRIL 2013 www.ti.com CONFIGURATION REGISTER The configuration register is a 16-bit read and write register used to store bits that control the operational modes of the temperature sensor. Read and write operations are performed MSB first. The format and power-up (reset) default value of the configuration register is shown in Table 6, followed by an explanation of the register bits. Other options for the default values are available by request. Table 6. Configuration and Power-Up/Reset Format BYTE D7 D6 D5 D4 D3 D2 D1 D0 ID CR1 CR0 FH FL TM M1 M0 1 0 0 1 0 0 1 1 0 POL 0 HYS1 HYS0 0 0 0 0 2 0 0 0 1 0 0 0 0 Hysteresis Control (HYS1 and HYS0) When operating in comparator mode, the hysteresis control bits (HYS1 and HYS0) configure the hysteresis for the limit comparison of the TMP108 to 0°C, 1°C, 2°C, or 4°C. The default hysteresis is 1°C. Table 7 shows the settings for HYS1 and HYS0. Table 7. Hysteresis Settings HYS1 HYS0 HYSTERESIS 0 0 0°C 0 1 1°C (default) 1 0 2°C 1 1 4°C Polarity (POL) The polarity of the ALERT pin can be programmed using the POL bit. If POL = '0' (default), the ALERT is active low. For POL = '1', the ALERT pin is active high, and the state of the ALERT pin is inverted. Mode Bits (M1 and M0) The mode bits, M1 and M0, can be set to three different modes: shutdown, one-shot, or continuous conversion. Shutdown Mode (M1 = '0', M0 = '0') Shutdown mode saves power by shutting down all device circuitry other than the serial interface, thus reducing current consumption to typically less than 0.5 μA. Shutdown mode is enabled when M1 and M0 = '00'. The device shuts down when current conversion is completed. One-Shot Mode (M1 = '0', M0 = '1') The TMP108 features a one-shot temperature measurement mode. When the device is in shutdown mode, writing a ‘01’ to the M1 and M0 bits starts a single temperature conversion. During the conversion, the M1 and M0 bits reads '01'. The device returns to the shutdown state at the completion of the single conversion. After the conversion, the M1 and M0 bits read '00'. This feature is useful for reducing the power consumption of the TMP108 when continuous temperature monitoring is not required. As a result of the short conversion time, the TMP108 can achieve a higher conversion rate. A single conversion typically takes 27 ms and a read can take place in less than 20 μs. However, when using one-shot mode, 30 or more conversions per second are possible. Continuous Conversion Mode (M1 = '1') When the TMP108 is in continuous conversion mode (M1 = '1'), a single conversion is performed at a rate determined by the conversion rate bits (CR1 and CR0 in the configuration register). The TMP108 performs a single conversion, and then goes in standby and waits for the appropriate delay set by the CR1 and CR0 bits. See Table 8 for CR1 and CR0 settings. 8 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Product Folder Links: TMP108 |
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同様の説明 - TMP108AIYFFT |
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