ASX340 datasheet(27/78 Pages) ETC2

27 / 78 page

PDF: 171981479/Source: 8304342517

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ASX340/MT9V139_DS Rev. C Pub. 3/11 EN

ASX340/MT9V139: 1/4-Inch Color CMOS NTSC/PAL Digital Image Sensor

Usage Modes

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Preliminary

Usage Modes

How a camera based on the ASX340/MT9V139 will be configured depends on what

features are used. In the simplest case, an ASX340/MT9V139 operating in Auto-Config

Mode with no customized settings might be sufficient. Flash sizes vary depending on

the data for registers, firmware, and overlay data—somewhere between 1KB to 16MB.

The two-wire bus is adequate since only high-level commands are used to invoke over-

lays, load registers from memory, or set up lens correction parameters. Overlay data can

alternatively be issued by the external µC if the rate of refreshing data is deemed

adequate. If there are no commands in the EEPROM or Flash image the device can be in

auto configuration mode by which the sensor is set up according to the status of pins

FRAME_VALID, LINE_VALID, DOUT_LSB1, and DOUT_LSB0.

In the simplest case no EEPROM or Flash memory or µC is required, as shown in

Figure 12. This is truly a single chip operation.

Figure 12:

Auto-Config Mode

The ASX340/MT9V139 can be configured by a serial EEPROM or Flash through the SPI

Interface.

Figure 13:

Flash Mode

Functions such as overlay or 2x zoom can also be assigned to general purpose inputs.

That capability can be employed on all configurations with external EEPROM or Flash

memory by mapping overlay images to an input. Alternatively, the µC may poll these

inputs to create an action such as a new overlay as shown in Figure 14.

Analog Out

Digital Out

Auto-Config Mode

ASX340/MT9V139

Serial

EEPROM/Flash

SPI

ASX340/MT9V139

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