ASI4UC-G1-MT ZMDI, ASI4UC-G1-MT Datasheet - Page 28

• Manufacturer Part Number: ASI4UC-G1-MT
• Description: Interface - Specialized ASI
• Manufacturer: ZMDI

Specifications of ASI4UC-G1-MT

• Product Category: Interface - Specialized
• Rohs: yes
• Product Type: Actuator Sensor Interface IC
• Operating Supply Voltage: 16 V to 33.1 V
• Supply Current: 6 mA
• Maximum Power Dissipation: 850 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SSOP-28
• Minimum Operating Temperature: - 25 C

3.3. Addressing Channel Input IRD
3.3.1.
To ease the configuration process for slave modules at the field application, a secondary command input
channel, the so-called Addressing Channel, IRD, is provided.
Once the channel is activated for communication, the IRD pin is receiving Manchester-II-coded (AS-i) master
telegrams, while the LED1 pin is returning slave response telegrams in Manchester-II format.
Applying a so-called Magic Sequence at the IRD input activates the Addressing Channel. It doesn’t matter
whether the IC is communicating at the AS-i input channel or staying in idle mode. As long as the initialization
process is finished and the IC is operating in Slave Mode, a correctly received Magic Sequence will reset the
Data and Parameter Outputs, generate appropriate Data Strobe and Parameter Strobe signals, reset the
Data_Exchange_Disable flag and turn the Addressing Channel active.
The Magic Sequence requires the reception of four consecutive correct AS-i telegrams in Manchester-II-
Format within a timeframe of 8.192 ms (-6.25%). The telegrams will neither be answered nor otherwise
internally processed. They are only checked for correct syntax (number of bits, correct start bit, end bit and
parity) and timing (compliance to standard AS-i telegram timing).
To avoid a wrong activation of the Addressing Channel by undesired cross coupling of signals from the AS-i
line to the IRD input, two additional security features are implemented.
The Addressing Channel generally becomes deactivated by IC reset.
If the IC is locked to the Addressing Channel and AC Current Input Mode (see descriptions further below) is
active, there are four special IC functions that were implemented to support existing handheld programming
devices (from the company Pepperl+Fuchs):
Data Sheet
January 30, 2012
ASI4U / ASI4U-E
Spec. 3.0 Com
1. The IC does not leave the Addressing Channel Mode after the reception of a Reset_Slave or
2. The IC does not leave the Addressing Channel during an IC reset that was caused by an expired
3. Software controlled IC resets (resets through Reset_Slave or Broadcast_Reset calls) are performed
1. The ASI4U resets the Magic Sequence telegram counter if more than 5 but less than 14 telegram bits
2. The ASI4U resets the Magic Sequence telegram counter if a telegram that was received at the IRD
Note: The UART processes both input channels (AS-i line + IRD Addressing Channel) in parallel and
generates Receive_Strobe signals after every correctly received Master telegram. A telegram correlation
between both channels is found, if Receive_Strobe signals from both input channels arrive at a time
frame of less or equal than 3µs and the telegram contents are equal too.
Broadcast_Reset call if the Data_Exchange_Disable flag is cleared (‘0’). This is always the case if the
ASI4U had performed Data-/Parameter communication in advance of the reset. Thus the handheld
had been operated in Data- or Parameter mode.
Communication Watchdog.
See chapter 3.14 for detailed descriptions of the Communication Monitor and Communication
Watchdog.
slightly different than in normal slave IC operation.
The IC still resets the Data and Parameter outputs immediately after reception of the calls and Data-
and Parameter-Strobe Signals are generated. However, the IC initialization procedure is postponed
for 2.048ms (-6.25%), keeping the IC blocked to any further telegram inputs at the Addressing
Channel or the AS-i line input. This is to avoid an immediate reactivation of the Addressing Channel
after IC initialization since the handheld programming device always sends five subsequent
Broadcast_Reset. The ASI4U would otherwise process the first reset call from the handheld correctly
but take the four remaining calls for a new Magic Sequence.
were correctly received. Pulse signals that lead to detection of a communication error before the 6
telegram bit shall not reset the Magic Sequence counter in order to avoid a blocking of the IRD
activation due to signal bouncing effects.
input correlates to the AS-i line input signal in terms of telegram reception time and content.
General Slave Mode Functionality
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 2.1
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is PRELIMINARY and subject to
changes without notice.
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