PS081 datasheet(142/155 Pages) AMSCO

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7-3

PSØ81

Other changes:

SPI opcode „Read Access“ has changed. In PS081 the 4 EEPROM cells are addressed subsequently.

The parameter „PS081Adjust“ (configreg_03, bit [9:4]) needs to be set in PS081, if the AV-rate

setting is <10. PS081adjust is thereby to set two times the AV-rate and a minimum of 8. E.g. the

AV-rate is 6, then PS081adjust would be 12.

7.2

Bug Report

Date

Reported Bug

Solution (if any)

Dec 2009

Cancelation of Full bridge parallel mode (zero drift

optimized)

Use standard full bridge

mode

Background:

This mode was introduced to reduce the zero drift of PS081 by paralleling RDSON

resistors on the chip. Intensive tests of several bonding options did unfortunately

not show any better behavior, in some cases even worse. Please use standard full

bridge mode instead, the systematic offset drift lies here in the range of ±6nV/

V/K and can be cross matched on the PCB.

July 2010

If any I/O pin is used as output, a maximum of 4

inputs can be configured. In other words, to increase

the number of inputs up to 21 is only possible if no

output is configured.

Background:

To increase the number of inputs an internal logic was added to connect not only

the 6 physical I/Os directly, but also combination of the lines. This works fine as

long as only inputs are configured. In July 2010 it was observed that as soon as

1 pin is configured as output, this internal logic does not work properly any longer.

This means, that the register 26, 27 and 28 which are normally used to indicate

the rising, pressed or falling flags of the buttons are not updated properly.

So if an output is configured, there are still inputs available, but only 4 as maxi-

mum and their status need to be checked in status register 22 instead of 26 to

28. In this sense, the maximum number of inputs and outputs when used mixed,

is input = 3 and output = 3. If you have an application with an update rate of >=

100 Hz there is another work-around option, please contact the support team of

acam in this case.

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