UM0581

Design details

Doc ID 14961 Rev 1

9/26

3

Design details

3.1

Jumper positions

The following jumper positions are used to explain the different configurations in this

document.

Two types of jumpers are used on the STR912FAW44 interface to hard disk board:

●

3-pin jumpers with two possible positions

●

2-pin jumpers with two possible settings:

–

in the “fitted” position, the circuit is closed

–

in the “not fitted” position, the circuit is open

3.2

Power supply

A typical HDD requires both 5 V and 12 V power supplies. The STR912FAW44 interface to

hard disk board is designed to be powered by the following three sources according to

availability:

●

ATX-SMPS provides both 12 V and 5 V supplies (connected to the SMPS connector

(J5)

●

12 V DC power adapter connected to the power or WAGO connector (should meet the

current ratings of HDD)

●

15 V DC power adapter connected to the power or WAGO connector (should meet the

current ratings of HDD).

The power supply is configured by setting the related jumpers and connectors as described

in Table 1 on page 11.

Figure 4.

Jumper settings

AM01272v1