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April 20041M9999-040604

Application Note 105

Demo Board Current Consumption

KS8995M/KS8995X

General Description

When the system designer needs to create a power budget

for choosing voltage regulators or for designing power cir-

cuits, numbers for the worst-case current consumption per

voltage rail as measured on the KS8995M/X demo board are

extremely useful.

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

Max. Current

Voltage RailConsumptionWorst Case

3.3V110mAAll five ports link at 100BT

2.5V520mAAll five ports link at 10BT

1.8V160mAAll five ports link at 100BT

Table 1.KS8995M/X Demo Board Current

Consumption

Operation and Measurement Conditions

The KS8995M/X operates using three dierent voltage rails:

3.3V, 2.5V, and 1.8V.

It can also operate using two separate voltage supplies by

using 2.5V as the digital VDDIO; however, this means that the

MII ports cannot be used.

The measurements shown in Table 1 are for the worst-case

current consumption per voltage rail. They were taken at

room temperature with a trac generator fully loading all ve

ports.

Note that the worst-case current consumption for the 2.5V rail

is in 10BT mode. This is because most of the current draw

from the 2.5V rail is from the Ethernet transceivers. The 10BT

draws more current than 100BT for the transceivers.

Keep in mind that these numbers are for the total power

consumption for these voltages on the entire board, which

includes current drawn by the LEDs and the EEPROM. The

LEDs and EEPROM draw up to 80% of the 3.3V current

shown in Table 1.

Current consumption numbers for the KS8995M/X are given

in the KS8995M/X data sheet.

Please contact your local Micrel FAE or salesperson if you

have any questions.

Product specificaties