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TCS37715FN 数据表(PDF) 20 Page - OSRAM GmbH |
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TCS37715FN 数据表(HTML) 20 Page - OSRAM GmbH |
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20 / 49 page  ams Datasheet Page 19 [v1-31] 2018-Apr-04 Document Feedback TCS3771 − Principles of Operation The LED drive current is controlled by a regulated current sink on the LDR pin. This feature eliminates the need to use a current limiting resistor to control LED current. The LED drive current can be configured for 12.5mA, 25mA, 50mA, or 100mA. For higher LED drive requirements, an external P-FET transistor can be used to control the LED current. The number of LED pulses can be programmed to any value between 1 and 255 pulses as needed. Increasing the number of LED pulses at a given current will increase the sensor sensitivity. Sensitivity grows by the square root of the number of pulses. Each pulse has a 14μs period. Figure 23: Proximity IR LED Waveform The proximity integration time (PTIME) is the period of time that the internal ADC converts the analog signal to a digital count. It is recommend that this be set to a minimum of PTIME = 0xFF or 2.4ms. |
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