TSL2671

DIGITAL PROXIMITY DETECTOR

TAOS118 − JANUARY 2011

15

The LUMENOLOGY

r Company

r

r

Copyright

E 2011, TAOS Inc.

www.taosinc.com

Command Register

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

Table 2. Command Register

6

75

4

ADD

2

31

0

COMMAND

COMMAND

TYPE

− −

FIELD

BITS

DESCRIPTION

COMMAND

7

Select Command Register. Must write as 1 when addressing COMMAND register.

TYPE

6:5

Selects type of transaction to follow in subsequent data transfers:

FIELD VALUE

DESCRIPTION

00

Repeated byte protocol transaction

01

Auto-increment protocol transaction

10

Reserved — Do not use

11

Special function — See description below

Transaction type 00 will repeatedly read the same register with each data access.

Transaction type 01 will provide an auto-increment function to read successive register bytes.

ADD

4:0

Address register/special function register. Depending on the transaction type, see above, this field either

specifies a special function command or selects the specific control-status-register for following write and

read transactions:

FIELD VALUE

DESCRIPTION

00000

Normal — no action

00101

Proximity interrupt clear

Proximity Interrupt Clear clears any pending proximity interrupt. This special function is self clearing.

Enable Register (0x00)

The ENABLE register is used to power the device on/off, enable functions, and interrupts.

Table 3. Enable Register

6

75

4

PON

2

31

0

ENABLE

Reserved

Resv

Reserved

Address

0x00

PIEN

WEN

PEN

FIELD

BITS

DESCRIPTION

Reserved

7:6

Reserved. Write as 0.

PIEN

5

Proximity interrupt mask. When asserted, permits proximity interrupts to be generated.

Reserved

4

Reserved. Write as 0.

WEN

3

Wait Enable. This bit activates the wait feature. Writing a 1 activates the wait timer. Writing a 0 disables the

wait timer.

PEN

2:1

Proximity enable. These bits activate the proximity function. Writing a 11b enables proximity. Writing a 00b

disables proximity. The Wait Time register should be configured before asserting proximity enable.

0

Power ON. This bit activates the internal oscillator to permit the timers and ADC channel to operate. Writing

a 1 activates the oscillator. Writing a 0 disables the oscillator.

NOTES: 1. See Power Management section for more information.

2. A minimum interval of 2.72 ms must pass after PON is asserted before proximity can be initiated. This required time is enforced

by the hardware in cases where the firmware does not provide it.