MT9D131 Datasheet, PDF (105/132 Pages) ON Semiconductor – CMOS Digital Image Sensor

MT9D131: 1/3.2-Inch 2-Mp SOC Digital Image Sensor
Start-Up and Usage
Start-Up and Usage
The start-up sequence consists of the following:
1. Power-up
2. Hardware reset
3. Configure and enable PLL
4. Configure pad slew rate
5. Configure preview mode
6. Configure capture mode
7. Perform lock or capture
To start the part, power up power supplies, provide an input clock, and perform a hard-
ware reset.
Power-Up
There are no specific requirements to the order in which different supplies are turned
on. Once the last supply is stable within the valid ranges specified below, follow the hard
reset sequence to complete the power-up sequence. To minimize leakage current, all the
power supplies should be turned on at the same time
.
Analog Voltage: 2.8V for best image performance
Digital Voltage: 1.8V ±0.1V (1.7V–1.9V)
I/O Voltage: 1.7V–3.1V
Power-Down
Note:
Before powering down the sensor, it is recommended to bypass the PLL. Once this is
completed, the input clock (EXTCLK) can be turned off. After EXTCLK is off, turn off all
the power supplies as shown in Figure 28 on page 106. RESET_BAR should also be LOW
at this time.
Turning the power supplies off cannot be used as a method of achieving low power
consumption. Power to the sensor needs to be provided as long as the system is
active. For the lowest power consumption, refer to the standby procedure.
MT9D131_DS Rev. J 5/15 EN
105
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