Revision C. A2SI Datasheet

A2SI C. Datasheet pdf. Equivalent


Part A2SI
Description Release Notes IC Revision C
Feature www.DataSheet4U.com A²SI Release Notes, IC Revision C Technical Upgrades in A²SI Revision C Effect.
Manufacture Zentrum Mikroelektronik Dresden
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A2SI
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A²SI
Release Notes, IC Revision C
Technical Upgrades in A²SI Revision C
Effected part of the A²SI Description of modification
UART
Telegram Checker
UART
Master Mode
Main State Machine
Slave Mode
Communication Watchdog
Oscillator
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.
Effected part of the A²SI Description of modification
Infrared input channel
Slave Mode
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.
Release Notes, A²SI Revision C, August 28, 2002 ZMD AG
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A2SI
A²SI
Release Notes, IC Revision C
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 of an IC of Revision C
shall be connected to a series of one capacitor and one resistor, in the same manner like on Re-
vision B. Suggested values are C=4.7nF, R=430…680 Ohms. See the Data Sheet and the Appli-
cation Notes for more detailed information.
Package Marking
TOP VIEW
BOTTOM
VIEW
A2SI ZMD
C-XXXXYZZ
+
LLLLLL
PIN 1
Figure 1: Package Marking
PIN 1
Top Marking:
A²SI Product name
ZMD
C-
XXXX
Y
ZZ
Manufacturer
Revision code marking of A²SI Revision C
Date code (year and week)
Assembly location
Traceability
Bottom Marking:
LLLLLL
ZMD Lot Number
The yellow dot indicating pre-programmed Master function is printed at the pin 1 marking .
Note: IC Revision A did not have a revision code marking. ICs without a Revision Code are equivalent to
Revision A. Revision B shows “B-“ .
Release Notes, A²SI Revision C, August 28, 2002 ZMD AG
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