a2si-mt ETC-unknow, a2si-mt Datasheet

a2si-mt

Manufacturer Part Number

a2si-mt

Description

Release Notes Revision

Manufacturer

ETC-unknow

Datasheet

1.A2SI-MT.pdf (4 pages)

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Technical Upgrades in A²SI Revision C

Release Notes, A²SI Revision C, August 28, 2002

Effected part of the A²SI

Infrared input channel

Slave Mode

Effected part of the A²SI

UART

Telegram Checker

UART

Master Mode

Main State Machine

Slave Mode

Communication Watchdog

Oscillator

Description of modification

It appeared the infrared input channel (IRD) was sensitive against

coupled noise in some application circuits. In order to make the

photo current input more robust for a broad variety of designs, the

analog receiver circuit had been changed. This resulted in a

much better performance in terms of noise sensitivity but required

a slightly lower signal sensitivity as well. See the updated Data

Sheet for more information.

Description of modification

The telegram reception under worst case capacitive and worst

case inductive network conditions was improved in response to

suggestions of the technical committee of the AS-International

Association.

The digital MAN-code communication channel does now support

a more cost effective two-wire data transfer between the A²SI

and the master control logic. It is not necessary to rely on the

additional ‘Receive_Strobe’ signal, which is supplied at the pa-

rameter port P2 in Master Mode to verify the correctness of the

MAN output signal at the LED port.

The MAN signal is now distinctively disturbed if an erroneous

telegram was detected at the AS-i input. This allows to spare at

least one opto coupler in between the A²SI and the master con-

trol.

If running, the communication watchdog will now become turned

off as soon as the volatile slave address register is changed to

zero (0x0). This occurs after the reception of a Delete_Address

call or at a reset of the A²SI.

In all previous revisions, a running communication watchdog

could only be turned off by a reset of the A²SI (reception of Re-

set_Slave call or external reset).

In case the watchdog was running and a master did not submit a

Reset_Slave call prior to an address assignment, the write ac-

cess to the non-volatile E²PROM memory could have been inter-

rupted. Because a data corruption is likely in such an event, the

A²SI resumed to the fail save state of slave address zero (0x0)

and did not respond to the newly assigned address until the ad-

dress assignment call was repeated.

The loop gain of the oscillator was increased to support a

broader variety of 8MHz crystals.

ZMD AG

Release Notes, IC Revision C

A²SI

1/4

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a2si-mt Summary of contents

Page 1

Technical Upgrades in A²SI Revision C Effected part of the A²SI UART Telegram Checker UART Master Mode Main State Machine Slave Mode Communication Watchdog Oscillator Effected part of the A²SI Infrared input channel Slave Mode Release Notes, A²SI Revision C, ...

Page 2

The replacement of A²SI Revision B with Revision C neither has any impact to required external components nor requires a change of the external circuitry. The CAP-Pin Revision C shall be connected to a series of ...

Page 3

... Ordering Information Ordering Description Code A2SI-ST Standard version of A²SI A2SI-SR Standard version of A²SI A2SI-MT Pre-programmed master function A2SI-MR Pre-programmed master function Sales Contacts Sales Office Dresden Zentrum Mikroelektronik Dresden AG Grenzstraße 28 D-01109 Dresden Germany Phone +49-351-8822-310 Fax +49-351-8822-337 sales@zmd.de ...

Page 4

Trademark: A²SI™ trademark of AMI Semiconductor, Inc. Life Support Policy ZMD products are not designed, intended, or authorised for use as components in systems intended for surgical implant into the body, or other applications intended to support or ...

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