TMG39921 datasheet(27/96 Pages) OSRAM

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[v1-06] 2018-Feb-27

TMG3992 − Detailed Description

tPROX RESULT = tINIT + tCNVT + PPULSE x tACC

tTOTAL LED ON = PPULSE x tLED ON

tTOTAL LED OFF = tPROX RESULT – tTOTAL LED ON

An Interrupt can be generated with each new proximity result

or whenever proximity results exceed or fall below levels set in

the PITHL and/or PITHH threshold registers. To prevent prema-

ture/false interrupts an interrupt persistence filter is also in-

cluded; interrupts will only be asserted if the consecutive num-

ber of out-of-threshold results is equal or greater than the value

set by PPERS. Each “in-threshold” proximity result, PDATA, will

reset the persistence count. If the analog circuitry becomes sat-

urated, the PGSAT bit will be asserted to indicate PDATA results

may not be accurate. The PINT and PGSAT bits are always avail-

able for I2C polling, but PIEN bit must be set for PINT to assert

a hardware interrupt on the INT pin. Similarly, saturation of the

analog data converter can be detected by polling PGSAT bit; to

enable this feature the PSIEN bit must be set. PVALID is cleared

by reading PDATA. PGSAT and PINT are cleared PICLEAR or

AICLEAR.

Color and Ambient Light Sense Operation

The Color and Ambient Light Sense detection functionality uses

an array of color and IR filtered photodiodes to measure red,

green, and blue content of light, as well as the non-color filtered

clear channel. The following registers and control bits govern

Color/ALS operation and the operational flow is depicted in

Figure 33.

(EQ1)

(EQ2)

(EQ3)

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