MT9V023_17 datasheet(13/43 Pages) ONSEMI

Il numero della parte	MT9V023

Spiegazioni elettronici	1/3-Inch Wide?륷GA CMOS Digital Image Sensor

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MT9V023

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TWO-WIRE SERIAL INTERFACE SAMPLE READ AND WRITE SEQUENCES

16-Bit Write Sequence

A typical write sequence for writing 16 bits to a register

is shown in Figure 9. A start bit given by the master,

followed by the write address, starts the sequence. The

image sensor then gives an acknowledge bit and expects the

register address to come first, followed by the 16-bit data.

After each 8-bit the image sensor gives an acknowledge bit.

All 16 bits must be written before the register is updated.

After 16 bits are transferred, the register address is

automatically incremented, so that the next 16 bits are

written to the next register. The master stops writing by

sending a start or stop bit.

Figure 9. Timing Diagram Showing a WRITE to Reg0x09 with the Value 0x0284

SCLK

SDATA

START

ACK

0xBA ADDR

ACK

STOP

Reg0x09

1000 0100

0000 0010

16-Bit Read Sequence

A typical read sequence is shown in Figure 10. First the

master has to write the register address, as in a write

sequence. Then a start bit and the read address specifies that

a read is about to happen from the register. The master then

clocks out the register data 8 bits at a time. The master sends

an acknowledge bit after each 8-bit transfer. The register

address is auto-incremented after every 16 bits is

transferred. The data transfer is stopped when the master

sends a no-acknowledge bit.

Figure 10. Timing Diagram Showing a READ from Reg0x09, Returned Value 0x0284

SCLK

SDATA

START

ACK

0xBA ADDR

0xB9 ADDR

0000 0010

Reg0x09

ACK

1000 0100

NACK

STOP

8-Bit Write Sequence

To be able to write 1 byte at a time to the register a special

register address is added. The 8-bit write is done by first

writing the upper 8 bits to the desired register and then

writing the lower 8 bits to the Bytewise Address register

(R0xF0). The register is not updated until all 16 bits have

been written. It is not possible to just update half of a register.

In Figure 11, a typical sequence for 8-bit writing is shown.

The second byte is written to the Bytewise register (R0xF0).

Figure 11. Timing Diagram Showing a Bytewise Write to R0x09 with the Value 0x0284

STOP

R0xF0

ACK

START

0xB8 ADDR

ACK

DATA

SCLK

ACK

R0x09

0xB8 ADDR

0000 0010

1000 0100

START

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