MT9M034 datasheet(39/56 Pages) ONSEMI

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MT9M034_DS Rev. G Pub. 4/15 EN

©Semiconductor Components Industries, LLC,2015.

MT9M034: 1/3-Inch CMOS Digital Image Sensor

Two-Wire Serial Register Interface

Single READ from Random Location

This sequence (Figure 18) starts with a dummy WRITE to the 16-bit address that is to be

used for the READ. The master terminates the WRITE by generating a restart condition.

The master then sends the 8-bit read slave address/data direction byte and clocks out

one byte of register data. The master terminates the READ by generating a no-acknowl-

edge bit followed by a stop condition. Figure 18 shows how the internal register address

maintained by the MT9M034 is loaded and incremented as the sequence proceeds.

Figure 18:

Single READ from Random Location

Single READ from Current Location

This sequence (Figure 19) performs a read using the current value of the MT9M034

internal register address. The master terminates the READ by generating a no-acknowl-

edge bit followed by a stop condition. The figure shows two independent READ

sequences.

Figure 19:

Single READ from Current Location

Sequential READ, Start from Random Location

This sequence (Figure 20) starts in the same way as the single READ from random loca-

tion (Figure 18). Instead of generating a no-acknowledge bit after the first byte of data

has been transferred, the master generates an acknowledge bit and continues to

perform byte READs until “L” bytes have been read.

Figure 20:

Sequential READ, Start from Random Location

S = start condition

P = stop condition

Sr = restart condition

A = acknowledge

A = no-acknowledge

slave to master

master to slave

Slave Address

A Reg Address[15:8]

Reg Address[7:0]

Slave Address

Read Data

Previous Reg Address, N

Reg Address, M

M+1

Slave Address

Read Data

Slave Address

Read Data

Previous Reg Address, N

Reg Address, N+1

N+2

Slave Address

A Reg Address[15:8]

Read Data

Reg Address[7:0] A

Read Data

Slave Address

Previous Reg Address, N

Reg Address, M

M+1

M+2

M+1

M+3

Read Data

M+L-2

M+L-1

M+L

A P

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