ISL29125IROZ-T7 datasheet(8/17 Pages) INTERSIL

No de pièce	ISL29125IROZ-T7

Description	Digital Red, Green and Blue Color Light Sensor with IR Blocking Filter

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ISL29125

8

FN8424.2

January 24, 2014

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Read Operation

ISL29125 has two basic read operations: Byte Read and Burst

Read.

BYTE READ

Byte read operations allows the master to access any register

location in the ISL29125. The Byte read operation is a two step

process. The master issues the START condition and the Device

Address byte with the R/W bit set to “0”, receives an

acknowledge, then issues the Register Address byte. After

acknowledging receipt of the register address byte, the master

immediately issues another START condition and the Device

Address byte with the R/W bit set to “1”. This is followed by an

acknowledge from the device and then by the 8-bit data word.

The master terminates the read operation by not responding with

an acknowledge and then issuing a stop condition. Refer to

Figure 10.

BURST READ

Burst read operation is identical to the Byte Read operation.

After the first Data byte is transmitted, the master now responds

with an acknowledge, indicating it requires additional data. The

device continues to output data for each acknowledge received.

The master terminates the read operation by not responding with

an acknowledge but issuing a STOP condition (refer to Figure 11).

For more information about the I2C standard, please consult the

Phillips™ I2C specification documents.

FIGURE 9. START, DATA STABLE, ACKNOWLEDGE AND STOP CONDITION

FIGURE 10. BYTE ADDRESS READ SEQUENCE

SDA FROM

RECEIVER

SDA FROM

TRANSMITTER

SCL FROM

MASTER

START

DATA

CHANGE

DATA

STABLE

DATA

STABLE

ACK

STOP

8

th

CLk

9

th CLk

HIGH IMPEDANCE

1 0 0 010 00

A

C

K

A

C

K

S

T

A

R

T

DEVICE ADDRESS

WRITE

ADDRESS BYTE

SIGNAL FROM

MASTER DEVICE

SIGNAL AT SDA

SIGNALS FROM

SLAVE DEVICE

A

C

K

S

T

O

P

DEVICE ADDRESS

READ

DATA BYTE

S

T

A

R

T

1 0 0 010 01

FIGURE 11. BURST READ SEQUENCE

1 0001 000

A

C

K

A

C

K

S

T

A

R

T

DEVICE ADDRESS

WRITE

AD DRESS B YTE

SIGNA L FRO M

M ASTER DEVICE

SIGN AL AT SDA

SIG NALS FROM

SLAVE DEVICE

A

C

K

S

T

O

P

DEVICE ADDRESS

READ

DATA BYTE 1

S

T

A

R

T

1 000 1001

A

C

K

DATA BYTE 2

A

C

K

D ATA BYTE n

(“n” is any integer

greater than 1)

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