TSL4531

DIGITAL AMBIENT LIGHT SENSOR

TAOS112 − OCTOBER 2011

8

r

r

Copyright

E 2011, TAOS Inc.

The LUMENOLOGY

r Company

www.taosinc.com

Register Set

The device is controlled and monitored by data registers and a command register accessed through the serial

interface. These registers provide for a variety of control functions and can be read to determine results of the

ADC conversions.

Table 1. Register Set

ADDRESS

RESISTER NAME

R/W

REGISTER FUNCTION

RESET

VALUE

−−

COMMAND

W

Specifies register address

0x00

0x00

CONTROL

R/W

Power on/off and single cycle

0x00

0x01

CONFIG

R/W

Powersave Enable / Integration Time

0x00

0x04

DATALOW

R

ALS Data LOW Register

0x00

0x05

DATAHIGH

R

ALS Data HIGH Register

0x00

0x0A

ID

R

Device ID

ID

protocols on the previous pages. In general, the COMMAND register is written first to specify the specific

control/status register for following read/write operations.

There are 16 register locations, but only 5 registers are implemented. To make the register read process more

efficient when reading multiple bytes of data as in the combined format protocol, the address index pointer is

automatically incremented to skip over the unused registers, as shown in Figure 7.

0

1

2

3

4

5

6

7

8

9

A

B

C

D

E

F

Address in hex

Address increments by 1 except where noted:

Cycle is 0h, Ah, Bh, Ch, Dh, 0h

Figure 7. Combined Format Read Cycle Pattern

Command Register

The command register specifies the address of the target register for future write and read operations. It

contains two user fields as described below and defaults to 0x00 at power-on.

Table 2. Command Register

6

75

4

ADDRESS

2

31

0

COMMAND

COMMAND

Reserved

FIELD

BITS

DESCRIPTION

COMMAND

7

Select Command Register. Must write as 1.

Reserved

6:4

Reserved. Write as 0.

ADDRESS

3:0

Address register. Selects the specific register for write and read transactions that follow.