MT9M034 datasheet(21/53 Pages) ONSEMI

21 / 53 page

MT9M034/D Rev. 8, 2/16 EN

©Semiconductor Components Industries, LLC,2016.

MT9M034: 1/3-Inch CMOS Digital Image Sensor

Real-Time Context Switching

In the MT9M034, the user may switch between two full register sets (listed in Table 10)

by writing to a context switch change bit in R0x30B0[13]. This context switch will change

all registers (no shadowing) at the frame start time and have the new values apply to the

immediate next exposure and readout time.

Features

See the MT9M034 Register Reference for additional details.

Reset

The MT9M034 may be reset by using RESET_BAR (active LOW) or the reset register.

Hard Reset of Logic

The RESET_BAR pin can be connected to an external RC circuit for simplicity. The

recommended RC circuit uses a 10k resistor and a 0.1F capacitor. The rise time for the

RC circuit is 1s maximum.

Soft Reset of Logic

Soft reset of logic is controlled by the R0x301A Reset register. Bit 0 is used to reset the

digital logic of the sensor while preserving the existing two-wire serial interface configu-

ration. Furthermore, by asserting the soft reset, the sensor aborts the current frame it is

processing and starts a new frame. This bit is a self-resetting bit and also returns to “0”

during two-wire serial interface reads.

Table 10:

Real-Time Context-Switch Registers

Context A

Context B

Y_Addr_Start

R0x3002

R0x308C

X_Addr_Start

R0x3004

R0x308A

Y_Addr_End

R0x3006

R0x3090

X_Addr_End

R0x3008

R0x308E

Coarse_Integration_Time

R0x3012

R0x3016

Fine_Integration_Time

R0x3014

R0x3018

Y_Odd_Inc

R0x30A6

R0x30A8

Column Gain

R0x30B0[5:4]

R0x30B0[9:8]

Green1_Gain (GreenR)

R0x3056

R0x30BC

Blue_Gain

R0x3058

R0x30BE

Red_Gain

R0x305A

R0x30C0

Green2_Gain (GreenB)

R0x305C

R0x30C2

Global_Gain

R0x305E

R0x30C4

Frame_Length_Lines

R0x300A

R0x30AA

Digital_Binning

R0x3032[1:0]

R0x3032[5:4]

Operation_Mode_Ctrl

0x3082

0x3084

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