Release Notes, ASI Revision C, August 28, 2002 ZMD AG
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ASI
Release Notes, IC Revision C
Technical Upgrades in ASI Revision C
Effected part of the ASI
Description of modification
UART
Telegram Checker
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.
UART
Master Mode
The digital MAN-code communication channel does now support
a more cost effective two-wire data transfer between the ASI
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 ASI and the master con-
trol.
Main State Machine
Slave Mode
Communication Watchdog
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 ASI.
In all previous revisions, a running communication watchdog
could only be turned off by a reset of the ASI (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 EPROM memory could have been inter-
rupted. Because a data corruption is likely in such an event, the
ASI 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.
Oscillator
The loop gain of the oscillator was increased to support a
broader variety of 8MHz crystals.
Effected part of the ASI
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, ASI Revision C, August 28, 2002 ZMD AG
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ASI
Release Notes, IC Revision C
The replacement of ASI 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 Marking:
ASI
Product name
ZMD
Manufacturer
C-
Revision code marking of ASI Revision C
XXXX
Date code (year and week)
Y
Assembly location
ZZ
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-" .
PIN 1
TOP VIEW
BOTTOM
VIEW
PIN 1
LLLLLL
A
2
SI
ZMD
C-XXXXYZZ
+
Figure 1:
Package Marking
Release Notes, ASI Revision C, August 28, 2002 ZMD AG
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ASI
Release Notes, IC Revision C
Ordering Information
Ordering
Code
Description
Operating Tempera-
ture Range
Package Type
Device
Marking
Shipping Form
A2SI-ST
Standard version
of ASI
-25C to 85C
28-pin SSOP
ASI
Tubes
(47 parts/tube)
A2SI-SR
Standard version
of ASI
-25C to 85C
28-pin SSOP
ASI
Tape-and-Reel
(1500 parts/reel)
A2SI-MT
Pre-programmed
master function
-25C to 85C
28-pin SSOP
ASI
+ yellow dot
Tubes
(47 parts/tube)
A2SI-MR
Pre-programmed
master function
-25C to 85C
28-pin SSOP
ASI
+ yellow dot
Tape-and-Reel
(1500 parts/reel)
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D-01109 Dresden
Germany
Phone +49-351-8822-310
Fax +49-351-8822-337
sales@zmd.de
Engineering Support
Design Office Dresden
Zentrum Mikroelektronik Dresden AG
Bertolt-Brecht-Allee 22
D-01309 Dresden
Germany
Phone +49-351-31530-86
Fax +49-351-31530-11
asi@zmd.de
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ZMD America Inc.
201 Old Country Road
Melville, NY 11747
USA
Phone +1-631-549-2666
Fax +1-631-549-2882
info@zmda.com
Release Notes, ASI Revision C, August 28, 2002 ZMD AG
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ASI
Release Notes, IC Revision C
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2002 Zentrum Mikroelektronik Dresden AG. All rights reserved.
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