TMD27253M datasheet(34/50 Pages) AMSCO

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[v1-11] 2016-Sep-20

TMD2725 − Register Description

CALIB Register (Address 0xD7)

Figure 49:

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

small portion of the LED 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

registers C0 and C1 until the proximity result is as close to

BINSRCH_TARGET as possible without becoming zero.

Optical and electrical calibration function identically, except

that during an electrical calibration the proximity photodiode

is disconnected from the AFE.

Upon power-up, the device always automatically performs an

electrical calibration. However, an electrical calibration can be

initiated anytime by setting the ELECTRICAL_CALIBRATION and

START_OFFSET_CALB 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

7:6

Reserved

ELECTRICAL_

CALIBRATION

0RW

Selects proximity calibration type.

1 = electrical offset only.

0 = calibration compensates for electrical and

optical crosstalk.

4:1

Reserved

START_OFFSET_

CALIB

Set to 1 to start a calibration sequence.

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