TMD27253M datasheet(26/50 Pages) AMSCO

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[v1-11] 2016-Sep-20

TMD2725 − Register Description

PCFG0 Register (Address 0x8E)

Figure 33:

PCFG0 Register

The PPULSE_LEN field sets the width of all IR LED pulses within

the proximity cycle. Longer pulses result in increased proximity

range and typically result in less electrical noise generated in

the analog front end. However, a setting of 8μs is recommended

because less cumulative noise is generated during a proximity

cycle.

The PPULSE field sets the maximum number of IR LED pulses

that may occur in a proximity cycle. The proximity engine will

automatically continue to add IR LED pulses, up to the value set

in PPULSE or if a near-saturation condition occurs.

The dynamic range of the sensor is automatically adjusted to

detect distant targets as well as prevent saturation from close

targets.

This operation also reduces power consumption because

proximity integration period is automatically shortened when

a target is either to close or far from the sensor.

Addr: 0x8E

PCFG0

Bit

Bit Name

Default

Access

Bit Description

7:6

PPULSE_LEN

Proximity Pulse Length

Value

Pulse Length

04μs

18μs

216μs

332μs

5:0

PPULSE

001111

Maximum Number of Pulses in a single proximity cycle.

Value

Maximum Number of Pulses

……

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