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AD7147 데이터시트(PDF) 15 Page - Analog Devices |
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AD7147 데이터시트(HTML) 15 Page - Analog Devices |
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15 / 71 page  AD7147 Data Sheet Rev. E | Page 14 of 70 Full Power Mode In full power mode, all sections of the AD7147 remain fully powered and converting at all times. While a sensor is being touched, the AD7147 processes the sensor data. If no sensor is touched, the AD7147 measures the ambient capacitance level and uses this data for the on-chip compensation routines. In full power mode, the AD7147 converts at a constant rate. See the CDC Conversion Sequence Time section for more information. Low Power Mode When AD7147 is in low power mode, the POWER_MODE bits are set to 10 upon device initialization. If the external sensors are not touched, the AD7147 reduces its conversion frequency, thereby greatly reducing its power consumption. The part remains in a reduced power state while the sensors are not touched. The AD7147 performs a conversion after a delay defined by the LP_CONV_DELAY bits, and it uses this data to update the compensation logic and check if the sensors are active. The LP_CONV_DELAY bits set the delay between conversions to 200 ms, 400 ms, 600 ms, or 800 ms. In low power mode, the total current consumption of the AD7147 is an average of the current used during a conversion and the current used while the AD7147 is waiting for the next conversion to begin. For example, when LP_CONV_DELAY is 400 ms, the AD7147 typically uses 0.85 mA of current for 36 ms and 14 μA of current for 400 ms during the conversion interval. (Note that these conversion timings can be altered through the register settings. See the CDC Conversion Sequence Time section for more information.) The time for the AD7147 to transition from a full power state to a reduced power state after the user stops touching the external sensors is configurable. The PWR_DOWN_TIMEOUT bits (in the Ambient Compensation Control 0 (AMB_COMP_CTRL0) Register at Address 0x002) control the time delay before the AD7147 transitions to the reduced power state after the user stops touching the sensors. Latency from Touch to Response In low power mode, the AD7147 remains in a low power state until any one of the external sensors are touched. When a sensor is touched, the AD7147 begins a conversion sequence every 36 ms to read back data from the sensors. This means that the latency between the user touching the sensor, and the AD7147 responding, is a maximum of LP_CONV_DELAY ms. Low Latency from Touch to Response In low power mode, the AD7147P model remains in a low power state until proximity is detected on any one of the external sensors. When proximity is detected, the AD714P begins a conversion sequence every 36 ms, or 18 ms, or 9 ms to read back data from the sensors. The latency between first touch and the AD7147P responding is much reduced, compared to the AD7147, because the part is already in a full power state by the time the user has touched the sensor. NO YES YES NO TIMEOUT AD7147 SETUP AND INITIALIZATION POWER_MODE = 10 ANY SENSOR TOUCHED? CONVERSION SEQUENCE EVERY LP_CONV_DELAY UPDATE COMPENSATION LOGIC DATA PATH PROXIMITY TIMER COUNTDOWN CONVERSION SEQUENCE EVERY 9/18/36ms FOR SENSOR READBACK ANY SENSOR TOUCHED? Figure 22. Low Power Mode Operation, AD7147 NO YES YES NO TIMEOUT AD7147P SETUP AND INITIALIZATION POWER_MODE = 10 USER IN PROXIMITY TO SENSOR? CONVERSION SEQUENCE EVERY LP_CONV_DELAY UPDATE COMPENSATION LOGIC DATA PATH PROXIMITY TIMER COUNTDOWN CONVERSION SEQUENCE EVERY 9/18/36ms FOR SENSOR READBACK USER IN PROXIMITY TO SENSOR? Figure 23. Low Power Mode Operation, AD7147P |
유사한 부품 번호 - AD7147_17 |
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유사한 설명 - AD7147_17 |
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