MT9M021, MT9M031
www.onsemi.com
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User interaction with the sensor is through the two-wire
serial bus, which communicates with the array control,
analog signal chain, and digital signal chain. The core of the
sensor is a 1.2 Mp Active-Pixel Sensor array. The
MT9M021/MT9M031 features global shutter technology
for accurate capture of moving images. The exposure of the
entire array is controlled by programming the integration
time by register setting. All rows simultaneously integrate
light prior to readout. Once a row has been read, the data
from the columns is sequenced through an analog signal
chain (providing offset correction and gain), and then
through an analog-to-digital converter (ADC). The output
from the ADC is a 12-bit value for each pixel in the array.
The ADC output passes through a digital processing signal
chain (which provides further data path corrections and
applies digital gain). The pixel data are output at a rate of up
to 74.25 Mp/s, in parallel to frame and line synchronization
signals.
FEATURES OVERVIEW
The MT9M021/MT9M031 Global Sensor shutter has
a wide array of features to enhance functionality and to
increase versatility. A summary of features follows. Please
refer to the MT9M021/MT9M031 Developer Guide for
detailed feature descriptions, register settings, and tuning
guidelines and recommendations.
• Operating Modes
The MT9M021/MT9M031 works in master (video),
trigger (single frame), or Auto Trigger modes. In
master mode, the sensor generates the integration and
readout timing. In trigger mode, it accepts an external
trigger to start exposure, then generates the exposure
and readout timing. The exposure time is programmed
through the two-wire serial interface for both modes.
NOTE: Trigger mode is not compatible with the HiSPi
interface.
• Window Control
Configurable window size and blanking times allow
a wide range of resolutions and frame rates. Digital
binning and skipping modes are supported, as are
vertical and horizontal mirror operations.
• Context Switching
Context switching may be used to rapidly switch
between two sets of register values. Refer to the
MT9M021/MT9M031 Developer Guide for a complete
set of context switchable registers.
• Gain
The MT9M021/MT9M031 Global Shutter sensor can
be configured for analog gain of up to 8x, and digital
gain of up to 8x.
• Automatic Exposure Control
The integrated automatic exposure control may be used
to ensure optimal settings of exposure and gain are
computed and updated every other frame. Refer to the
MT9M021/MT9M031 Developer Guide for more
details.
• HiSPi
The MT9M021/MT9M031 Global Shutter image sensor
supports two or three lanes of Streaming-SP or
Packetized-SP protocols of ON Semiconductor’s
High-Speed Serial Pixel Interface.
• PLL
An on chip PLL provides reference clock flexibility and
supports spread spectrum sources for improved EMI
performance.
• Reset
The MT9M021/MT9M031 may be reset by a register
write, or by a dedicated input pin.
• Output Enable
The MT9M021/MT9M031 output pins may be
tri-stated using a dedicated output enable pin.
• Temperature Sensor
• Black Level Correction
• Row Noise Correction
• Column Correction
• Test Patterns
Several test patterns may be enabled for debug
purposes. These include a solid color, color bar, fade to
grey, and a walking 1s test pattern.
