TMD2712 datasheet(35/54 Pages) OSRAM

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TMD2712 − Register Description

CALIB Register (Address 0xD7)

Figure 52:

CALIB Register

Proximity response in systems with electrical and optical

crosstalk may be improved by using the calibration feature.

Optical crosstalk is caused when the photodiode receives a

portion of the VCSEL IR which was unintentionally reflected by

a surface other than the target. Electrical offset is caused by

electrical disturbance in the sensor AFE, and also influences the

proximity result. The calibration routine adjusts the value in

POFFSETL/H until the proximity result is as close to the binary

search target as possible. Optical and electrical calibration

function identically, except that during an electrical calibration

the proximity photodiode is disconnected from the AFE.

An electrical calibration can be initiated anytime by setting the

ELECTRICAL_CALIBRATION and START_OFFSET_CAL bits. To

perform an optical (and electrical) calibration do not set the

ELECTRICAL_CALIBRATION bit when setting the START_

OFFSET_CALIB. The CINT flag will assert after calibration has

finished. Upon completion proximity offset registers are

automatically loaded with calibration result.

Addr: 0xD7

CALIB

Bit

Bit Name

Default

Access

Bit Description

7CALAVG

Enables proximity hardware averaging as

selected with PROX_AVG during calibration.

0 = No hardware averaging

1 = Hardware averaging enabled

Reserved

Reserved. Must be set to default value.

ELECTRICAL_

CALIBRATION

0RW

Selects proximity calibration type.

0 = Electrical and optical crosstalk.

1 = Electrical crosstalk only.

4CALPRATE

Enables PRATE during calibration. Useful when

averaging is enabled.

0 = PRATE ignored

1 = PRATE applied between averaging samples

3:1

Reserved

Reserved. Must be set to default value.

START_OFFSET_CAL

Set to 1 to start a calibration sequence.

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