TSL2771

LIGHT-TO-DIGITAL CONVERTER

with PROXIMITY SENSING

TAOS100B − FEBRUARY 2011

19

The LUMENOLOGY

r Company

r

r

Copyright

E 2011, TAOS Inc.

www.taosinc.com

ALS Timing Register (0x01)

The ALS timing register controls the internal integration time of the ALS channel ADCs in 2.72 ms increments.

Table 4. ALS Timing Register

FIELD

BITS

DESCRIPTION

ATIME

7:0

VALUE

INTEG_CYCLES

TIME

MAX COUNT

0xFF

1

2.72 ms

1024

0xF6

10

27.2 ms

10240

0xDB

37

101 ms

37888

0xC0

64

174 ms

65535

0x00

256

696 ms

65535

Proximity Time Control Register (0x02)

The proximity timing register controls the integration time of the proximity ADC in 2.72 ms increments. It is

recommended that this register be programmed to a value of 0xFF (1 integration cycle).

Table 5.

Proximity Time Control Register

FIELD

BITS

DESCRIPTION

PTIME

7:0

VALUE

INTEG_CYCLES

TIME

MAX COUNT

0xFF

1

2.72 ms

1023

Wait Time Register (0x03)

Wait time is set 2.72 ms increments unless the WLONG bit is asserted in which case the wait times are 12

×

longer. WTIME is programmed as a 2’s complement number.

Table 6.

Wait Time Register

FIELD

BITS

DESCRIPTION

WTIME

7:0

REGISTER VALUE

WAIT TIME

TIME (WLONG = 0)

TIME (WLONG = 1)

0xFF

1

2.72 ms

0.032 sec

0xB6

74

201 ms

2.4 sec

0x00

256

696 ms

8.3 sec

NOTE: The Proximity Wait Time Register should be configured before PEN and/or AEN is/are asserted.