ASI4UC-G1-MT ZMDI, ASI4UC-G1-MT Datasheet - Page 19

• 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

2.3.9.
A new feature of AS-i Complete Specification v3.0 is also support of 4-bit wide output data in Extended
Address Mode. In Extended Address Mode it was, up to Complete Specification v2.11, only possible to send
three data output bits from the master to the slave because telegram bit I3 is used to select between A- and B-
slave type for extended slave addressing (up to 62 slaves per network). In normal address mode I3 carries
output data for pin D3.
The new definition introduces a multiplexed data transfer, so that all 4-bits of the data output port can be used
again. A first AS-i cycle transfers the data for a 2-bit output nibble only, while the second AS-i cycle transfers
the data for the contrary 2-bit nibble. Nibble selection is done by the remaining third bit. To ensure continuous
alternation of bit information I2 and thus continued data transfer to both nibbles, a special watchdog was
implemented that observes the state of I2 bit. The watchdog can be activated or deactivated by E²RPOM
setting. It provides a watchdog filter time of about 327ms.
The multiplexed transfer of course increases the refresh time per output by a factor of two, however, some
applications can tolerate this increase for the benefit of less external circuitry and better slave address
efficiency. The sampling cycle of the data inputs remains unchanged since the meaning of I3 bit was not
changed in the slave response with the definition of the Extended Address Mode.
More detailed information is described in chapter 3.7.5 Support of 4I/4O processing in Extended Address
Mode, Profile 7.A.x.E on page 40.
2.3.10.
The enhanced data input features described above require additional registers in the data input path that store
the input values for a certain time before they hand them over to the AS-i transmitter. This causes a time delay
in the input path that could lead to a delayed “turn off” event, if the registers were activated by intention or by
accident in AS-i Safety Applications.
To safely exclude an activation of the enhanced data I/O features in Safety Applications, the IC provides a
special Safety Mode that is strongly recommended to be used for AS-i Safety communication purposes. See
chapter 3.7.6 Safety Mode Operation on page 40 for further details.
2.3.11.
ASI4U newly supports enhanced status indication by two LED outputs. A special mode for direct application of
Dual-LEDs and the respective different signaling modes is also implemented. Compared to the A²SI, the
former U5RD pin was reassigned as LED2 pin. Thus, compatibility to existing A²SI board layouts is still
guaranteed. However, it will require to keep LED2 pin disabled (default state at delivery) in order to avoid
short-circuiting of U5R to ground. More detailed information on the different signaling schemes and their
activation can be found in chapter 3.9 LED outputs on page 46.
2.3.12.
Data and Parameter communication are continuously observed by a communication monitor. If neither
Data_Exchange nor Write_Parameter calls were addressed to and received by the IC within a time frame of
about 41ms, a so called No Data/Parameter Exchange status is detected and signaled at LED1.
If the respective flags are set in the E²PROM the communication monitor can also act as communication
watchdog that initiates a complete IC reset after expiring of the watchdog timer. The watchdog mode can also
be activated and deactivated by a signal at parameter port pin P0. For more detailed information see chapter
3.14 Communication Monitor/Watchdog on page 53.
2.3.13.
As defined in AS-i Complete Specification v3.0 the ASI4U also supports write protection for ID_Code_Exten-
sion_1. The feature allows the activation of new manufacturer protected slave profiles and is enabled by
E²PROM setting. It is described in more detail in chapter 3.16 Write Protection of ID_Code_Extension_1 on
page 54
Data Sheet
January 30, 2012
ASI4U / ASI4U-E
Spec. 3.0 Com
4 Input / 4 Output processing in Extended Address Mode
AS-i Safety Mode
Enhanced LED Status Indication
Communication Monitor/Watchdog
Write protection of ID_Code_Extension_1
© 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.
pliant Universal AS-I IC
19 of 63