Getting started

UM0592

6/22

Doc ID 15036 Rev 1

1.4.1

Power supply

A typical HDD requires both 5 V and 12 V supplies. The HDD bridge extension board for the

EVAL-STR910 is designed to be powered by the following:

●

an ATX-SMPS to provide a 5 V supply to the board, and a 5 V and 12 V supply to the

hard disk

●

or by using separate 5 and 12 V DC supplies to power on the hard disk and board.

Note:

The supply should meet the current ratings mentioned on the hard disk. The better option is

to choose the ATX-SMPS.

The EVAL-STR910 demonstration board is designed to be powered by a 5 V DC power

supply. It is possible to provide 5 V DC power from the daughterboard extension connectors

by selecting the suitable jumper of the EVAL-STR910 board and extension board as

explained below. The power supply is configured by setting the related jumpers and

connectors as described in Table 1.

Table 1.

Power supply jumper setting

Power supply

Description

ATX-SMPS

The board has a power-on provision using the ATX-SMPS. Connect the floppy drive power-

on connector to J16 of the extension board as shown in Figure 10. Also connect the ATX-

PWR-ON connector provided by the SMPS to power on the external HDD.

Jumper settings are as follows:

– J16 (of extension board): make sure the direction of the 5 V and 12 V connection on the

– J6 (of EVAL-STR910 board): open: fit the jumper on DTB of CN6 to provide 5 V DC power

from the extension board extension connectors

Separate 5 and 12 V

DC supply

Fit the jumpers on DTB and PSU of JP6 to provide the 5 V supply to the board and the

If the user does not have a separate supply to power on the board, then these options are

better.

– J16 (of extension board): open

– J6: (of EVAL-STR910 board): for the power supply jack (CN2) to both the EVAL-STR910

demonstration board and the extension board connected to CN5 and CN6, JP6 is set as

shown:

or

– J16 (of extension board): fitted

– J6 (of EVAL-STR910 board): fit the jumper on DTB of CN6 to provide 5 V DC power from

the daughterboard extension connectors.

1.

A reverse connection will damage the board

2.

Supply should meet the current ratings mentioned on the hard disk

USB

DTB

PSU

USB

DTB

PSU

USB

DTB

PSU