6

FN6522.0

October 31, 2008

Register Set

There are four registers that are available in the ISL29015. Table 1 summarizes their functions.

Command Register I 00(hex)

The first command register has the following functions:

1. Operation Mode: Bits 7, 6, and 5.These three bits

determines the operation mode of the device.

2. Bit 4 to 0 has been reserved to 0.

Command Register II 01(hex)

The second command register has the following functions:

1. Amplitude of IR driver current: Bits 7 and 6. This device

provides current source to drive an external IR LED. The

drive capability can be programmed through Bits 7 and 6.

For example, the device sources 100mA out of the IRDR

pin if Bits 7 and 6 are 0 during proximity sensing.

2. Modulation Frequency: Bits 5 and 4. These two bits set

the IR LED driver’s modulation frequency.

3. Resolution: Bits 3 and 2. Bits 3 and 2 determine the

ADC’s resolution and the number of clock cycles per

conversion in Internal Timing Mode. Changing the

number of clock cycles does more than just change the

resolution of the device. It also changes the integration

time, which is the period the device’s analog-to-digital

START

W

A

A

A6 A5 A4 A3 A2 A1 A0 W

A R7 R6 R5 R4 R3 R2 R1 R0 A B7 B6 B5 B4 B3 B2 B1 B0

A

A

1

2

615

948

STOP

SDA DRIVEN BY MASTER

FUNCTIONS

REGISTER ADDRESS

DEVICE ADDRESS

SDA DRIVEN BY MASTER

SDA DRIVEN BY MASTER

AA

34

5

7

8

9

2

3

4

6

7

8

1

2

3

5

67

9

A

TABLE 1. REGISTER SET

ADDR

REG NAME

BIT

7

6

5

4

3

2

1

0

DEFAULT

00h

COMMANDI

OP2

OP1

OP0

0

0

0

0

0

00h

01h

COMMANDII

IS1

IS0

FREQ1

FREQ0

RES1

RES0

RANGE1

RANGE0

00h

02h

D7

D6

D5

D4

D3

D2

D1

D0

00h

03h

D15

D14

D13

D12

D11

D10

D9

D8

00h

TABLE 2. OPERATION MODE

BITS 7 TO 5

OPERATION

000

Power-down the device

001

ALS once

010

IR once

011

Proximity once

100

Reserved

101

ALS continuous

110

IR continuous

111

Proximity continuous

TABLE 3. CURRENT SOURCE CAPABILITY AT IRDR PIN

BITS 7: 6

IRDR PIN SOURCE CURRENT

00

100mA IR LED driver

01

50mA IR LED driver

10

25mA IR LED driver

11

12.5mA IR LED driver

TABLE 4. MODULATION FREQUENCY

BITS 5:4

MODULATION FREQUENCY

(kHz)

00

DC

01

N/A

10

N/A

11

360

ISL29015