ASI4UC-G1-MT ZMDI, ASI4UC-G1-MT Datasheet - Page 16

• 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

2.2. General Operational Modes
The ASI4U provides two main and two additional sub operational modes. Main operation modes divide in
Slave Mode and Master Mode. Sub operation modes divide in Repeater Mode and Monitor Mode. The later
were derived from Master Mode in providing different output signals at the Parameter Port.
A definition of which operational mode becomes active is made by programming the flags Master_Mode and
Repeater_Mode in the Firmware Area of the E²PROM (see also Table 7 on page 24). The E²PROM is read
out at every initialization of the IC. Online mode switching is not provided. The following configurations apply:
Table 5: Assignment of operational modes
In Slave Mode the ASI4U operates as fully featured AS-i Slave IC according to AS-i Complete Specification
v3.0.
In Master Mode the ASI4U translates a digital output signal from the master control logic (etc. PLC, µP, …) to
a correctly shaped, analog AS-i pulse sequence and vice versa. Every AS-i telegram received is checked for
consistency with the AS-i communication protocol specifications and if no errors were found, an appropriate
receive strobe signal is generated.
Master Mode and Monitor Mode differ in the kind of signaled telegrams. In Master Mode a single Receive
Strobe signal is provided validating every correctly received Slave Response while in Monitor Mode two
different Receive Strobe signals are available displaying every correctly received Master and Slave telegram
separately. The Monitor Mode is intended for use in intelligent slaves and bus monitors that provide own
telegram decoding mechanisms but do not check for correct telegram timing or syntax.
The Repeater Mode is specifically provided for AS-i bus repeater applications.
2.3. Slave Mode
The Slave Mode is probably the most complex operational mode of the IC. The ASI4U does not only support
all mandatory AS-i Slave functions but also a variety of additional features that shall make AS-i Slave module
design very easy and flexible.
Data Sheet
January 30, 2012
IRD CMOS /
AC
INPUT
FID DIGITAL /
ANALOG
STAGE
INPUT STAGE
OUTPUT
STAGE
Selected Operational Mode
Slave Mode
Master Mode
Repeater Mode
Monitor Mode
ASI4U / ASI4U-E
Spec. 3.0 Com
CURRENT
© 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
The IRD pin is input for the additional addressing channel in Slave Mode (see description
of General IC Operational Modes below) or direct AS-i transmitter input in Master Mode.
In Slave Mode it can be operated either in CMOS Mode or AC-current input mode. The
later is provided for direct connection of a photo diode. More detailed information can be
found in chapter 3.3 Addressing Channel Input IRD.
Pin FID can be set to digital CMOS mode or analog voltage input mode. In Slave Mode it
is set to CMOS operation, in Master Mode it works in analog mode and acts as input for
the power fail comparator.
All digital inputs, except of the oscillator pins, have high voltage capabilities and partly
Schmitt-Trigger and Pull-Up features. For more details see chapter 3.4 Digital Inputs - DC
Characteristics.
All digital output stages, except of the oscillator pins, have high voltage capabilities and
are implemented as NMOS open drain buffers. Each pin can sink up to 10mA of current.
Master Mode Flag
0
1
1
0
Repeater Mode Flag
0
0
1
1
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