TSL26721FN datasheet(33/47 Pages) OSRAM

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[v1-01] 2019-Nov-20

TSL2672 − Principles O f Operation

Proximity Data Registers (0x18 - 0x19)

Proximity data is stored as a 16-bit value. When the lower byte

is read, the upper byte is latched into a shadow register. The

shadow register ensures that both bytes are the result of the

same proximity cycle, even if additional proximity cycles occur

between the lower byte and upper byte register readings. The

simplest way to read both bytes is to perform a two-byte I²C

read operation using the auto-increment protocol, which is set

in the Command register TYPE field.

Figure 39:

Proximity Data Registers

Proximity Offset Register (0x1E)

The 8-bit proximity offset register provides compensation for

proximity offsets caused by device variations, optical crosstalk,

and other environmental factors. Proximity offset is a

sign-magnitude value where the sign bit, bit 7, determines if

the offset is negative (bit 7 = 0) or positive (bit 7 = 1). At power

up, the register is set to 0x00. The magnitude of the offset

compensation depends on the proximity gain (PGAIN),

proximity LED drive strength (PDRIVE), and the number of

proximity pulses (PPULSE). Because a number of environmental

factors contribute to proximity offset, this register is best suited

for use in an adaptive closed-loop control system. See available

ams application notes for proximity offset register application

information.

Figure 40:

Proximity Offset Register

Address

Bits

Description

PDATAL

0x18

7:0

Proximity data low byte

PDATAH

0x19

7:0

Proximity data high byte

SIGN

MAGNITUDE

Field

Bit

Description

SIGN

Proximity Offset Sign. The offset sign shifts the proximity data negative when equal to

0 and positive when equal to 1.

MAGNITUDE

6:0

Proximity Offset Magnitude. The offset magnitude shifts the proximity data positive

or negative, depending on the proximity offset sign. The actual amount of the shift

depends on the proximity gain (PGAIN), proximity LED drive strength (PDRIVE), and

the number of proximity pulses (PPULSE).

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