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Reference:CMV300-datasheet-v2.11

CMV300 Datasheet

Page 13 of 54

3 DRIVING THE CMV300

3.1 SUPPLY SETTINGS

The CMV300 image sensor has the following supply settings:

Supply

name

Usage

Recommended

value

Maximum

tolerance

DC Current

Idle

DC Current

Nom.

DC Current

Max.

VDD20

LVDS, ADC

2.2V

-0.4/+0.05V

175mA

220mA

270mA

VDD33

Dig. I/O. SPI, ADC

3.3V

+/-0.3V

25mA

30mA

VDDpix

Pixel array supply

3.0V

+/-0.3V

1mA

5mA

Total DC Power

470mW

600mW

710mW

See pin list for exact pin numbers for every supply.

The maximum currents will be reached during readout. The current of the VDD20 supply depends on the average value

of the image (a pure white image will draw 270mA). Idle is when the sensor is idle (not reading out or integrating) and

nominal is a 50% grey average image. These values are for a sensor running at 40MHz. The power consumption

decreases with the clock speed albeit little.

Besides these DC currents, decoupling should be foreseen to suppress current spikes. VDDPIX can generate current

spikes up to 500mA during FOT. Because this supply is the pixel array supply, the voltage should be as noise-free as

possible, because noise can ripple through to the image. We propose to use 5x 100nF capacitors on each supply as close

to the sensor as possible.

3.2 BIASING

For optimal performance, some pins need to be decoupled to ground or to VDD. Please refer to the pin list for a detailed

description for every pin and the appropriate decoupling if applicable.

3.3 DIGITAL INPUT PINS

The table below gives an overview of the external pins used to drive the sensor.

Pin name

Description

CLK_IN

Master input clock, frequency range between 10 and

40 MHz

SYS_RES_N

System reset pin, active low signal. Resets the on-

board sequencer and must be kept low during start-

FRAME_REQ

Frame request pin. This signal should be at least one

period of CLK_IN long to assure detection.

SPI_IN

Data input pin for the SPI interface. The data to

program the image sensor is sent over this pin.

SPI_EN

SPI enable pin. When this pin is high the data should

be written/read on the SPI

SPI_CLK

SPI clock. This is the clock on which the SPI runs (max

40Mz)

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