MT9V024 datasheet(20/62 Pages) ONSEMI

20 / 62 page

MT9V024_DSRev. G Pub. 4/15 EN

©Semiconductor Components Industries, LLC, 2015.

MT9V024: 1/3-Inch Wide-VGA Digital Image Sensor

Two-Wire Serial Interface Sample Read and Write Sequences

Included in the MT9V024 is a register lock (R0xFE) feature that can be used as a solution

to reduce the probability of an inadvertent noise-triggered two-wire serial interface

write to the sensor. All registers, or only the read mode registers–R0x0D and R0x0E, can

be locked. It is important to prevent an inadvertent two-wire serial interface write to the

read mode registers in automotive applications since this register controls the image

orientation and any unintended flip to an image can cause serious results.

At power-up, the register lock defaults to a value of 0xBEEF, which implies that all

registers are unlocked and any two-wire serial interface writes to the register gets

committed.

Lock All Registers

If a unique pattern (0xDEAD) to R0xFE is programmed, any subsequent two-wire serial

interface writes to registers (except R0xFE) are NOT committed. Alternatively, if the user

writes a 0xBEEF to the register lock register, all registers are unlocked and any

subsequent two-wire serial interface writes to the register are committed.

Lock Only Read Mode Registers (R0x0D and R0x0E)

If a unique pattern (0xDEAF) to R0xFE is programmed, any subsequent two-wire serial

interface writes to R0x0D or R0x0E are NOT committed. Alternatively, if the user writes a

0xBEEF to register lock register, registers R0x0D and R0x0E are unlocked and any

subsequent two-wire serial interface writes to these registers are committed.

MT9V024 Datasheet(PDF) 20 Page - ON Semiconductor