ISL29020IROZ-EVALZ【PDF 5/11 页】EVALUATION BOARD FOR ISL29020

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ISL29020

Register Set

There are three 8-bit registers in the ISL29020. Table 1 summarizes their functions.

TABLE 1. REGISTER SET

BIT

ADDR

00h

01h

02h

REG NAME

COMMAND

DATA LSB

DATA MSB

7

EN

D7

D15

6

MODE

D6

D14

5

LIGHT

D5

D13

4

RES2

D4

D12

3

RES1

D3

D11

2

RES0

D2

D10

1

RANGE1

D1

D9

0

RANGE0

D0

D8

DEFAULT

00h

00h

00h

4. Timing Mode and Resolution: Bits 4, 3 and 2. These three

TABLE 2. WRITE ONLY REGISTERS

bits determine whether the integration time is done

ADDRESS

b1xxx_xxxx

NAME

sync_I 2 C

FUNCTIONS/DESCRIPTION

Writing a logic 1 to this address bit

ends the current ADC-integration

internally or externally, and the number of bits for ADC. In

Internal Timing Mode, integration time is determined by

an internal oscillator (f OSC ) and the n-bit (n = 4, 8, 12, 16)

counter inside the ADC. In External Timing Mode, the

and starts another. Used only with

External Timing Mode.

Command Register (00 hex)

integration time is determined by the time between two

consecutive sync_I 2 C pulse commands.

TABLE 6. TIMING MODE AND RESOLUTION

The Read/Write command register has five functions:

1. Enable: Bit 7. This bit enables the ISL29020 with logic 1

and powers down ISL29020 with logic 0.

TABLE 3. ENABLE

BITS 4:3:2

0:0:0

0:0:1

0:1:0

MODE

Internal Timing, 16-bit ADC data output

Internal Timing, 12-bit ADC data output

Internal Timing, 8-bit ADC data output

BIT 7

0

1

OPERATION

Power-down the device

Enable the device

0:1:1

1:0:0

1:0:1

1:1:0

Internal Timing, 4-bit ADC data output

External Timing, ADC data output

External Timing, Timer data output

Reserved

2. Measurement Mode: Bit 6. This bit controls the two

measurement modes of the device. A logic 0 puts the

1:1:1

Reserved

device in the one-time measurement mode in which the

device is automatically shut-down after each

measurement. A logic 1 puts the device in the continuous

measurement mode in which data is collected

continuously.

TABLE 4. MEASUREMENT MODE

With Bit 4 set to 0, the device is configured to run in the

Internal-Timing mode. For example, the command register

content should be 1xx000xx to request 16-bit ADC in the

internal-timing mode.

With Bit 4 set to 1, the device is configured to run in the

External-Timing mode. For the external timing, the command

BIT 6

0

1

OPERATION

One-time measurement

Continuous measurement

1xx101xx needs to be sent to request the Timer data, the

number of clock cycles counted within the duration between

the two sync pulses (refer to Table 2). The Timer count is

read from register 01h (LSB) and 02h (MSB). The command

3. Light Sensing: Bit 5. This bit programs the device to do the

ambient light or the infrared (IR) light sensing. A logic 0,

requests for the ambient light sensing and a logic 1

requests for the IR sensing.

TABLE 5. LIGHT SENSING

1xx100xx needs to be sent to request the ADC conversion.

The ADC data is also read from register 01h (LSB) and 02h

(MSB).

Bits 3 and 2 determine the number of clock cycles per

conversion in the Internal-Timing mode. Changing the

number of clock cycles does more than just change the

BIT 5

0

1

OPERATION

Ambient light sensing

Infrared light sensing

5

resolution of the device. It also changes the integration

time, which the ADC uses to sample the photodiode

current signal for a measurement.

FN6505.1

August 20, 2009

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