TMD26723 Datasheet, PDF (22/29 Pages) ams AG – DIGITAL PROXIMITY DETECTOR

TMD2672
DIGITAL PROXIMITY DETECTOR
TAOS149C − AUGUST 2012
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 TAOS application notes for proximity offset register application information.
Table 17. Proximity Offset Register
lid ⁷
6
5
4
3
2
1
0
POFFSET
SIGN
MAGNITUDE
Reset
0x00
a _FIELD
BIT
DESCRIPTION
v _SIGN
7
Proximity Offset Sign. The offset sign shifts the proximity data negative when equal to 0 and positive when
equal to 1.
ill ^{Proximity Offset Magnitude. The offset magnitude shifts the proximity data positive or negative, depending}
MAGNITUDE
6:0
on the proximity offset sign. The actual amount of the shift depends on the proximity gain (PGAIN), proximity
Technicaaml ^{scoAnGtent st LED drive strength (PDRIVE), and the number of proximity pulses (PPULSE).}
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Copyright E 2012, TAOS Inc.
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