TMD2636 datasheet(10/48 Pages) OSRAM

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Datasheet, Public

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[v2-00] 2023-Jan-04

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TMD2636 − Detailed Description

Proximity Operation

By varying gain, VCSEL drive current, number of VCSEL pulses

and VCSEL pulse duration the proximity detection range can be

adjusted.

Proximity

Proximity results are affected by three fundamental factors: the

integrated IR VCSEL 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 14-bit proximity result in PDATA

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.

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

Alternate I²C Address Option

If the SDA and SCL pins are swapped as shown below, the device

will switch to an alternate I²C address. This allows two devices

to reside on the same bus. After power is applied to the devices,

a single dummy I²C access (read or write with valid I²C stop) to

any address or device on the same bus is required to initialize

the devices to their respective I²C addresses. The devices will

generate an NOT-ACKNOWLEDGE (NACK) during this initial

dummy access.

Detailed Description

TMD2636 Datasheet(PDF) 10 Page - OSRAM GmbH

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