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4-Level IO Control

2

4-Level IO Control

Many of the control pins on the DS125BR800A have more than two valid levels. Table 1 below shows how

to access each of these levels with the switch banks on the back side of the EVM.

Table 1. Switches to set the 4-Level input control pins

4-Level Input Settings

Setting for 3-pin switches (3-2-1)

0 - Tie 1 k

Ω to GND

ON - OFF - OFF

R - Tie 20 k

Ω to GND

OFF - ON - OFF

F - FLOAT (open)

OFF - OFF - OFF

1 - Tie 1 k

Ω to VIH

OFF - OFF - ON

The following switches are used to set the input condition for the 4-level inputs:

•

SW1, SW2, SW3, SW5, SW6, SW8, SW9

There are 3 switches connected to an input signal pin. Each switch when set to the ON position sets the

pin to one of the 4-level setting. The 6-pin switches are assigned similar to the 3-pin switches. The only

difference is 2 signal pins are connected and thus 6-5-4 is for the one signal pin and 3-2-1 is for another

signal pin.

NOTE:

Only 1 switch at the ON position is allowed. Activating more than one switch concurrently

results in an indeterminate voltage level.

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SNLU151 – September 2013

DS125BR800AEVM Evaluation Kit

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