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AD7147A Datasheet(PDF) 14 Page - Analog Devices |
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AD7147A Datasheet(HTML) 14 Page - Analog Devices |
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14 / 69 page  AD7147A Rev. B | Page 13 of 68 Full Power Mode In full power mode, all sections of the AD7147A remain fully powered and converting at all times. While a sensor is being touched, the AD7147A processes the sensor data. If no sensor is touched, the AD7147A measures the ambient capacitance level and uses this data for the on-chip compensation routines. In full power mode, the AD7147A converts at a constant rate. See the CDC Conversion Sequence Time section for more information. Low Power Mode When AD7147A is in low power mode, the POWER_MODE bits are set to 10 upon device initialization. If the external sensors are not touched, the AD7147A 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 AD7147A 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 AD7147A is an average of the current used during a conversion and the current used while the AD7147A is waiting for the next conversion to begin. For example, when LP_CONV_DELAY is 400 ms, the AD7147A 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 AD7147A 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 register (AMB_COMP_ CTRL0, Address 0x002) control the time delay before the AD7147A transitions to the reduced power state after the user stops touching the sensors. Low Latency from Touch to Response In low power mode, the AD7147A remains in a low power state until proximity is detected on any one of the external sensors. When proximity is detected, the AD7147A 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 AD7147A response is greatly reduced compared to the AD7147 because the part is already in a full power state by the time the user touches the sensor. NO YES YES NO TIMEOUT AD7147A 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 9ms, 18ms, OR 36ms FOR SENSOR READBACK USER IN PROXIMITY TO SENSOR? Figure 22. Low Power Mode Operation, AD7147A |
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