User Manual

Sleep After Interrupt Operation

After all the enabled engines/operational states have ex-

ecuted, causing a hardware interrupt, the state machine

returns to either IDLE or SLEEP, as selected by the Sleep

After Interrupt bit, SAI. SLEEP is entered when two condi-

tions are met: SAI = 1, and the INT pin has been asserted.

Entering SLEEP does not automatically change any of the

operational state is over-ridden by SLEEP state). SLEEP

state is terminated by an I²C clear of the INT pin or if SAI

bit is cleared.

Proximity Operation

The Proximity detection feature provides distance mea-

surement by photodiode detection of reected IR energy

sourced by the integrated LED. The following registers and

control bits govern proximity operation and the opera-

tional ow is depicted in Figure 8.

Table 1. Proximity Controls

ENABLE<PON> 0x80<0> Power ON

ENABLE<PEN> 0x80<2> Proximity Enable

ENABLE<PIEN> 0x80<5> Proximity Interrupt Enable

PILT 0x89 Proximity low threshold

PIHT 0x8B Proximity high threshold

PERS<PPERS> 0x8C<7:4> Proximity Interrupt Persistence

PPULSE<PPLEN> 0x8E<7:6> Proximity Pulse Length

PPULSE<PPULSE> 0x8E<5:0> Proximity Pulse Count

CONTROL<PGAIN> 0x8F<3:2> Proximity Gain Control

CONTROL<LDRIVE> 0x8F<7:6> LED Drive Strength

CONFIG2<PSIEN> 0x90<7> Proximity Saturation Interrupt Enable

CONFIG2<LEDBOOST> 0x90<5:4> Proximity/Gesture LED Boost

STATUS<PGSAT> 0x93<6> Proximity Saturation

STATUS<PINT> 0x93<5> Proximity Interrupt

STATUS<PVALID> 0x93<1> Proximity Valid

PDATA 0x9C Proximity Data

POFFSET_UR 0x9D Proximity Oset UP/RIGHT

POFFSET_DL 0x9E Proximity Oset DOWN/LEFT

CONFIG3<PCMP> 0x9F<5> Proximity Gain Compensation Enable

CONFIG3<PMSK_U> 0x9F<3> Proximity Mask UP Enable

CONFIG3<PMSK_D> 0x9F<2> Proximity Mask DOWN Enable

CONFIG3<PMSK_L> 0x9F<1> Proximity Mask LEFT Enable

CONFIG3<PMSK_R> 0x9F<0> Proximity Mask RIGHT Enable

PICLEAR 0xE5 Proximity Interrupt Clear

AICLEAR 0xE7 All Non-Gesture Interrupt Clear