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EAAPMST3923A3 データシート(PDF) 17 Page - Everlight Electronics Co., Ltd |
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EAAPMST3923A3 データシート(HTML) 17 Page - Everlight Electronics Co., Ltd |
17 / 23 page PS Mode The proximity sensor drives the IR-LED connected to IRDR pin and detects the intensity of the reflected IR light of an object close to the sensor. The IR-LED drive and ADC conversion cycle are started by setting the PS enable bit in the operation select register. The output data corresponding to the reflected IR intensity is stored in the data register. The IR-LED is controlled by an integrated LED driver with sink output. The drive current value (12.5 to 125mA) and the pulse count (1 to 256 pulses) are selectable to adjust the proximity detection distance. Moreover, measurement interval in PS mode can be adjusted with PS wait time (12.5 to 1600ms) which will reduce the overall current consumption. PS Interrupt Function The PS interrupt function is interrupting when the count of the PS output data meets the detection condition consecutively persistence count setting. In case of an interrupt event, the interrupt flag according to each condition is set to “1”, and the interrupt output pin is set to low level. The detection condition is that the PS output data is lower than the low threshold register value or higher than the high threshold register value. If the output data was out of the detection condition, the count is reset to zero. Once the interrupt flag has been activated by crossing the high threshold value and is then reset, it can be activated again only when output value drops below the low threshold value. Also when a low interrupt occurred, the next event which can trigger the interrupt is if the PS value exceeds the high threshold value. Detection Condition The number of detection is counted with condition below. PS output data < Low Threshold Value “OR” PS output data > High Threshold Value LED pulse PS A/DC Wait time 1 to256 pulse 12.5 to 1600ms 0.4 to 25.2ms 0.4 to 25.2ms 1 to256 pulse Time Data update Data update DATASHEET EAAPMST3923A3 Page 17 of 23 Rev. 0.01 Ver.:3 Release Date:03/21/2017 狀態:Approved(正式發行) |
同様の部品番号 - EAAPMST3923A3 |
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同様の説明 - EAAPMST3923A3 |
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