MT9V032 Datasheet, PDF (51/74 Pages) ON Semiconductor – Inch Wide-VGA CMOS Digital Image Sensor

MT9V032: 1/3-Inch Wide-VGA Digital Image Sensor
Feature Description
Hard Reset of Logic
The RC circuit for the MT9V032 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:
• R0x0C reset
Bit 0 is used to reset the digital logic of the sensor while preserving the existing two-wire
serial interface configuration. Furthermore, by asserting the soft reset, the sensor aborts
the current frame it is processing and starts a new frame. Bit 1 is a shadowed reset
control register bit to explicitly reset the automatic gain and exposure control feature.
These two bits are self-resetting bits and also return to “0” during two-wire serial inter-
face reads.
STANDBY Control
The sensor goes into standby mode by setting STANDBY to HIGH. Once the sensor
detects that STANDBY is asserted, it completes the current frame before disabling the
digital logic, internal clocks, and analog power enable signal. To release the sensor from
the standby mode, reset STANDBY back to LOW. The LVDS must be powered to ensure
that the device is in standby mode. See "Appendix B – Power-On
Reset and Standby Timing" on page 67 for more information on standby.
Monitor Mode Control
Monitor mode is controlled by:
• R0x0E monitor mode enable
• R0xC0 monitor mode image capture control
The sensor goes into monitor mode when R0x0E bit 0 is set to HIGH. In this mode, the
sensor first captures a programmable number of frames (R0xC0), then goes into a sleep
period for five minutes. The cycle of sleeping for five minutes and waking up to capture a
number of frames continues until R0x0E bit 0 is cleared to return to normal operation.
In some applications when monitor mode is enabled, the purpose of capturing frames is
to calibrate the gain and exposure of the scene using automatic gain and exposure
control feature. This feature typically takes less than 10 frames to settle. In case a larger
number of frames is needed, the value of R0xC0 may be increased to capture more
frames.
During the sleep period, none of the analog circuitry and a very small fraction of digital
logic (including a five-minute timer) is powered. The master clock (SYSCLK) is therefore
always required.
MT9V022_DS Rev. G 6/15 EN
46
©Semiconductor Components Industries, LLC, 2015.