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4 dc current measurements, Table 9-5, Table 9-6 – AMD Geode SC1201 User Manual

Page 368: Dc characteristics for on state

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368

AMD Geode™ SC1200/SC1201 Processor Data Book

Electrical Specifications

32579B

9.1.5.3

Definition of System Conditions for
Measuring On Parameters

The SC1200/SC1201 processor’s current is highly depen-
dent on two functional characteristics, DCLK (DOT clock)
and SDRAM frequency. Table 9-5 shows how these factors
are controlled when measuring the typical average and
absolute maximum processor current parameters.

9.1.5.4

DC Current Measurements

Table 9-6 and Table 9-7 show the DC current measure-
ments of the SC1200/SC1201 processor. The
SC1200/SC1201 processor supports TV, CRT, and TFT
displays, but it is expected that generally only one display
interface will be used. Power consumed by the
SC1200/SC1201 processor is different with different dis-
plays. The CRT and TV DACs require current, while the
TFT interface even though it has no DAC to power, also
draws current while it is active. The CRT and TV DACs 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 9-5. System Conditions Used to Measure SC1200/SC1201 Current During On State

CPU Current Measurement

System Conditions

V

CORE

(Note 1)

V

IO

(Note 1)

DCLK

Frequency

SDRAM

Frequency

Typical Average

Nominal

Nominal

50 MHz (Note 2)

Nominal

Absolute Maximum

Max

Max

135 MHz (Note 3)

Max

Note 1. See Table 9-3 on page 366 for nominal and maximum voltages.
Note 2. 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.

Note 3. 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 9-6. DC Characteristics for On State

Symbol

Parameter (Note 1)

Typ Avg

Abs Max

Unit

Comments

I

CC3ON

f

CLK

= 266 MHz, I/O Current @ V

IO

= 3.3V

(Nominal); CPU state = On, excludes TFT
interface contribution and DACs

240

260

mA

I

CC

for V

IO

I

COREON

f

CLK

= 266 MHz, Core Current @ V

CORE

=

1.8V (Nominal); CPU state = On

900

1090

mA

I

CC

for V

CORE

I

SBON

SB Current @ V

SB

= 3.3V (Nominal); CPU

state = On

1

2

mA

I

SBLON

SBL Current @ V

SBL

= 1.8V (Nominal); CPU

state = On

10

20

mA

I

CC3ONTFT

I/O current contribution if TFT display is used

30

50

mA

I

CCTV

If TV interface is used: CCTV Current @
V

CCTV

= 3.3 (Nominal); CPU state = On

120

150

mA

I

CCCRT

If CRT interface is used: CCCRT Current @
V

CCCRT

= 3.3 (Nominal); CPU state = On

60

80

mA

Note 1. f

CLK

ratings refer to internal clock frequency.

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