MCM20027IBBL データシートの表示（PDF） - Motorola => Freescale

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MCM20027IBBL

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

8.4 Tristate Mode

The sensors HCLK, SOF, VCLK, SYNC and STROBE

output signals as well as the pixel output data can be

tristated via the Tristate Control Register, (Table 23), on

page 42.

8.5 References CVREFP, CVREFM

The MCM20027 contains all internally generated refer-

ences and biases on-chip for system simplification. An

internally generated differential bandgap regulator de-

rives all the ADC and other analog signal processing re-

quired references. The user should connect 0.1µF

capacitors to the CVREFP and CVREFM pins (#15 and

#14 respectively) to accurately hold the biases.

8.7 Internal Bias Current Control

The ASP chain has internally generated bias currents

that result in an operating power consumption of nearly

400mW approx. (Accurate value will be given upon sen-

sor testing). By attaching a resistor between pin 20, EX-

TRES; and Pin19, the user can reduce the power

consumption of the device. This feature is enabled by

writing a 1b to bit res of the Power Configuration Regis-

ter. Additional power savings can be achieved at lower

clock rates. Note - The External Bias resistor Input pin

(EXTRESP - pin #20) should be connected to the

ETRESRTN (pin#19) in the manner described in the di-

agram below.

EXTRESP

(pin #20)

Resistor

8.6 Common Mode References: VAG, VAGREF and

VAGRETURN

The MCM20027 holds the Common Mode Reference

Voltages on the chip to a stable value. In order to

achieve this stable value, the VAG (pin #16),

VAGREF(pin #18 ) and VAGRETURN (pin #17) have to

be connected to two 0.1µF capacitors in the manner de-

scribed in the diagram below:

EXTRESRTN

(pin #19)

VAG

(pin #16)

VAGRETURN

(pin #17)

VAGREF

(pin #18)

0.1µF

0.1µF

Revision 8.4 - 24 Oct 2002: MCM20027

MOTOROLA

21

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