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April 2004 1 M9999-040604

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 Rail Consumption Worst Case

3.3V 110mA All five ports link at 100BT

2.5V 520mA All five ports link at 10BT

1.8V 160mA All 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.

Application Note 105 Micrel

M9999-040604 2 April 2004

MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL FAX WEB + 1 (408) 944-0800 + 1 (408) 944-0970 http://www.micrel.com

The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.

Micrel reserves the right to change circuitry and specications at any time without notication to the customer.

Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can

reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the

body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a signicant injury to the user. A Purchaser’s use or

sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for

any damages resulting from such use or sale.