MT9M011 View Datasheet(PDF) - Micron Technology
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MT9M011 Datasheet PDF : 41 Pages
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Preliminary‡
MT9M011 - 1/3-Inch Megapixel Image Sensor
Two-wire Serial Interface Sample Write and Read Sequences
Two-wire Serial Interface Sample Write and Read Sequences
16-Bit Write Sequence
A typical write sequence for writing 16 bits to a register is shown in Figure 8. A start bit
given by the master, followed by the write address, starts the sequence. The image sensor
will then give an acknowledge bit and expects the register address to come first, followed
by the 16-bit data. After each 8-bit transfer, the image sensor will give an acknowledge
bit. All 16 bits must be written before the register will be updated. After 16 bits are trans-
ferred, the register address is automatically incremented so that the next 16 bits are writ-
ten to the next register. The master stops writing by sending a start or stop bit.
Figure 8: Timing Diagram Showing a Write to Reg0x09 with the Value 0x0284
SCLK
SDATA
START
0xBA ADDR
ACK
Reg0x09
ACK
0000 0010
ACK
1000 0100
ACK
STOP
16-Bit Read Sequence
A typical read sequence is shown in Figure 9. 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 should be incremented after every 16 bits is transferred. The data transfer is
stopped when the master sends a no-acknowledge bit.
Figure 9: Timing Diagram Showing a Read from Reg0x09; Returned Value 0x0284
SCLK
SDATA
START
0xBA ADDR
ACK
Reg0x09
ACK
0xBB ADDR
ACK
0000 0010
ACK
1000 0100
STOP
NACK
PDF: 09005aef81051c04/Source: 09005aef8102abe8
MT9M011_2.fm - Rev. D 1/05 EN
14
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2004 Micron Technology, Inc. All rights reserved.
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