MT9D115 Datasheet, PDF (41/66 Pages) ON Semiconductor – CMOS Digital Image Sensor

MT9D115: 1/5-Inch SOC Digital Image Sensor
Power Modes
Power Modes
Power Application Sequence
ON Semiconductor recommends the following sequence to maintain low power
consumption during this process:
Caution Applying power to analog supplies prior to applying digital and IO supplies or any other fail-
ure to follow the correct power up sequence may result in high current consumption and die
heating. This can potentially result in performance and reliability issues.
1. Ensure that STANDBY is de-asserted and RESET_BAR is asserted.
2. Apply IO supply (VDD_IO) to the image sensor and wait for the IO supply to be stable.
3. Minimum of 1 ms after IO supply is stable, apply digital supply to the image sensor
and wait.
4. Enable EXTCLK and wait for the EXTCLK signal to stabilize.
5. De-assert RESET_BAR for a minimum of 10 EXTCLK cycles.
6. After asserting the RESET_BAR, apply analog supplies (VAA, VAA_PIX, and VDD_PLL) to
the image sensor.
7. After 6000 EXTCLK cycles from the end of step 6, the image sensor will be in soft
standby state.
8. Communication with the sensor thorough two-wire serial interface can start 1 EXT-
CLK after step 7.
In cases where the recommended procedure cannot be followed, the following condi-
tion would affect the sensor’s power consumption during the power application
sequence:
• When analog supplies are applied prior to the digital and IO supplies, high current
consumption on the analog supplies may be present.
MT9D115 DS Rev. E Pub. 4/15 EN
41
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