MCM20027IBMN View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MCM20027IBMN

Color SXGA Digital Image Sensor 1280 x 1024 pixel progressive scan solid state image sensor with integrated CDS/PGA/ADC, digital programming, control, timing, and pixel correction features

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

ImageMOS

8.0 Sensor External Controls (Additional

Operational Conditions)

The MCM20027 includes initialization, standby modes,

and external reference voltage outputs to afford the

user additional applications flexibility.

8.1 Initialization

The INIT input pin (#1) controls reinitialization of the

MCM20027. This serves to assure controlled chip and

system startup. Control is asserted via a logic high in-

put. (i.e.. Asserting a Logic high “1” initializes all the

Registers, while asserting a Logic low “0” returns the

sensor to normal operation).

Initialization of the sensor is a synchronous process and

therefore requires that MCLK be running when the INIT

pin is pulsed. The INIT line must be pulsed for a mini-

mum of 8 MCLKs. After the INIT input has been pulsed,

normal chip processing and/or I2C programming can

commence. This procedure ensures that the start-up

routines have run to completion. Tasks which are ac-

complished during startup include: reset of the utility

programming registers and initialization to their default

values (please refer to“MCM20027 Utility Programming

Registers” on page 32 for settings), reset of all internal

counters and latches, and setup of the analog signal

processing chain.

The INIT pin can also be used as an alternative method

of saving power consumption. To enable this power

saving mode - the INIT input pin must be held “High”

continuously during the entire desired power saving du-

ration. Note-Doing this will cause initialization of the

chip. For more information please refer to Comparison

of the 3 Reset and Power saving Modes; Table 5

8.2 Standby Mode

The standby mode option is implemented to allow the

user to reduce system power consumption during peri-

ods which do not require operation of the MCM20027.

This feature allows the user to extend battery life in low

power applications.

By utilizing this mode, the user may reduce dynamic

power consumption from 250mW RMS nominal

@13.5MHz to <100 uW in the standby mode.

The standby mode is activated by writing a “1” to bit 0 of

“Power Configuration Register” on page 41. Writing a

“0” restores normal operation. For more information

please refer to Comparison of the 3 Reset and Power

saving Modes; Table 5

8.3 State Reset

The State Reset mode option is implemented to allow

the user to switch the sensor back to Initial (Reset) state

WITHOUT reseting the current I2C register program-

ming. It can also be used to reduce system power con-

sumption during periods which do not require operation

of the MCM20027. This feature allows the user to ex-

tend battery life in low power applications.

By utilizing this mode, the user may reduce average

power consumption from 250mW RMS nominal

@13.5MHz to <100 uW in the standby mode.

The standby mode is activated by writing a “1” to bit 1 of

“Reset Control Register” on page 42. Writing a “0” re-

stores normal operation. For more information please

refer to Comparison of the 3 Reset and Power saving

Modes; Table 5

Mode

INIT

STATE

RESET

STANDBY

Digital

Timing

Stop

Yes

Yes

Yes

Analog

Blocks

Power Down

Yes

No

Yes

I2C

Registers

Reset

Yes

No

No

I2C Comm.

possible

No

Yes

Yes

Return State

Start of new

image frame

Start of new

image frame

Continue

current

frame

Comment

-Forces all digital outputs to

tristate

-Reset all I2C values to

default.

-No I2C progammability dur-

ing this mode.

-Returns to Start of 1st frame

after INIT is disserted.

-All I2C register values are

retained.

-All I2C registers can be pro-

grammed while in this mode.

-Returns to Start of first frame

after STATE RESET is dis-

serted.

-All I2C register values are

retained.

-All I2C registers can be pro-

grammed while in this mode.

-Returns the sensor to the

state it was in just prior to

STANDBY state being

asserted..

Table 5. Comparison of the 3 Reset and Power saving Modes

Enable By

Asserting a logic

high to pin #42.

Writing a “1” to

bit 1 of “Reset

Control Regis-

ter” on page 42.

Writing a “1” to

bit 0 of “Power

Configuration

Register” on

page 41.

MOTOROLA

Revision 8.4 - 24 Oct 2002 : MCM20027

20

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