PS081 datasheet(143/155 Pages) AMSCO

143 / 155 page

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7-4

PSØ81

May 2012

When exactly two of the six MultIOs are simultaneously ‘1’ and the rest four are

‘0’, then a multi input key(Section 4.4.4) is automatically detected. The condition of

two MultiIO pins being at ‘1’ can happen due to any of the following reasons:

1. For e.g. when two output ports are configured simultaneously to 1 from the

program.

2. When two inputs ports are set simultaneously to ‘1’ externally.

3. When two inputs are configured simultaneously (not one after another) with pull

up resistors.

4. When an input is switched simultaneously with an output.

Regardless of how the condition occurs, as a result the outputs function normally.

But the status registers showing the input status of MultIO0 – MultIO5 (RAM

address 22 and 26-28) are blocked by the falsely detected multi input. If it occurs

during configuration then further configuration of the 4 other IOs are blocked.

Once occurred, this condition can be resolved only by setting each of the previous-

ly ‘1’ MultIOs to 0.

Workaround:

Configure one MultIO port by default to 1 (either as output ‘1’ or as pulled up input)

permanently. This constant ‘1’ on one MultiIO port ensures the suppression of

the unwanted multi input detection from all the error sources listed. This however

leaves only 5 MultiIOs for effective usage.

7.3

Known issues and solutions

Issue: (known since July 2012)

Supply voltage reduction below 0.8V can cause an undefined state of PS081 („brown-out effect“)

where the chip does not react to the I/Os or interfaces anymore.

Solution:

When supply voltage is reduced, make sure it is reduced to true 0V and not only to a level < 0.8V.

7.4

Literature Guide

Datasheets

Title

Document-No

Date

PSØ81-EVA Evaluation System for PSØ81

DB_PS081_EVA V1.0

September 2009

ALCS-350 V2 Load Cell Simulator

DB_ALCS_V2 V0.1

August 2009

PicoProg Ø81

DB_PicoProg_Ø81_en_V0.1

January 2010

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