SC2200 datasheet(360/433 Pages) NSC

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360

Revision 3.0

Electrical Specifications (Continued)

8.1.4.3

Definition of System Conditions for Measur-

ingOnParameters

The SC2200’s current is highly dependent on two func-

tional characteristics, DCLK (DOT clock) and SDRAM fre-

quency. Table 8-4 shows how these factors are controlled

when measuring the typical average and absolute maxi-

mum processor current parameters.

8.1.4.4

DC Current Measurements

Table 8-5 and Table 8-6 show the DC current measure-

ments of the SC2200. The SC2200 supports CRT and TFT

displays, but it is expected that generally only one display

interface will be used. Power consumed by the SC2200 is

different with different displays. The CRT DAC requires cur-

rent, while the TFT interface even though it has no DAC to

power, also draws current while it is active. The CRT DAC

and the TFT interface are presented as separate line items.

The chosen display type I/O current should be added to the

Typical, Absolute Maximum, and Active Idle I/O currents to

get total current.

Table 8-4. System Conditions Used to Measure SC2200’s Current Used During the "On" State

CPU Current Measurement

System Conditions

VCORE

VIO

DCLK Freq.

SDRAM Freq.

Typical Average

Nominal

50 MHz2

Nominal

Absolute Maximum

Max

135 MHz3

Max

See Table 8-2 on page 358 for nominal and maximum voltages.

A DCLK frequency of 50 MHz is derived by setting the display mode to 800x600x8 bpp at 75 Hz, using a display image

of vertical stripes (4-pixel wide) alternating between black and white with power management disabled.

A DCLK frequency of 135 MHz is derived by setting the display mode to 1280x1024x8 bpp at 75 Hz, using a display

image of vertical stripes (1-pixel wide) alternating between black and white with power management disabled.

Table 8-5. DC Characteristics On Mode

Symbol

Parameter1

Typ Avg

Abs Max

Unit

Comments

ICC3ON

fCLK = 233 MHz, I/O Current @ VIO =3.3V

(Nominal); CPU mode = On, excludes TFT

interface contribution and CRT DAC

230

250

ICC for VIO

fCLK = 266 MHz, I/O Current @ VIO =3.3V

(Nominal); CPU mode = On, excludes TFT

interface contribution and CRT DAC

240

260

fCLK = 300 MHz, I/O Current @ VIO =3.3V

(Nominal); CPU mode = On, excludes TFT

interface contribution and CRT DAC

250

270

ICOREON

fCLK = 233 MHz, Core Current @ VCORE =

1.8V (Nominal); CPU mode = On

820

990

ICC for VCORE

fCLK = 266 MHz, Core Current @ VCORE =

1.8V (Nominal); CPU mode = On

900

1090

fCLK = 300 MHz, Core Current @ VCORE =

2.0V (Nominal); CPU mode = On

1050

1330

ISBON

SB Current @ VSB =3.3V(Nominal);CPU

mode = On

ISBLON

SBL Current @ VSBL =1.8V(Nominal);CPU

mode = On

SBL Current @ VSBL =2.0V(Nominal);CPU

mode = On

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