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TMD27253 Datasheet(PDF) 11 Page - ams AG |
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TMD27253 Datasheet(HTML) 11 Page - ams AG |
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11 / 50 page  ams Datasheet Page 11 [v1-11] 2016-Sep-20 Document Feedback TMD2725 − Detailed Description Proximity Proximity results are affected by three fundamental factors: the integrated IR LED emission, IR reception, and environmental factors, including target distance and surface reflectivity. The IR reception signal path begins with IR detection from a photodiode and ends with the 8-bit proximity result in PDATA register. Signal from the photodiode is amplified, and offset adjusted to optimize performance. Offset correction or cross-talk compensation is accomplished by adjustment to the POFFSET register. The analog circuitry of the device applies the offset value as a subtraction to the signal accumulation; therefore a positive offset value has the effect of decreasing the results. Ambient Light Sensing, ALS The ALS reception signal path begins as photodiodes receive filtered light and ends with the 16-bit results in the PHOTOPICL/H and ALS_IRL/H registers. The Photopic photodiode is filtered with a UV and IR filter. The ALS_IR photodiode is filtered to receive only IR. Signal from the photodiodes simultaneously accumulate for a period of time set by the value in ATIME before the results are available. Gain is adjustable from 1x to 64x to facilitate operation over a wide range of lighting conditions. Custom LUX equations are used to calculate the amount of ambient light, as well as, determine the light type (e.g. LED, fluorescent, incandescent, etc.) using the two ALS results. I²C Characteristics The device uses I²C serial communication protocol for communication. The device supports 7-bit chip addressing and both standard and fast clock frequency modes with a chip address of 0x39. Read and Write transactions comply with the standard set by Philips (now NXP). Internal to the device, an 8-bit buffer stores the register address location of the desired byte to read or write. This buffer auto-increments upon each byte transfer and is retained between transaction events (I.e. valid even after the master issues a STOP command and the I²C bus is released). During consecutive Read transactions, the future/repeated I²C Read transaction may omit the memory address byte normally following the chip address byte; the buffer retains the last register address + 1. Detailed Description |
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