ASI4UC-G1-SR-7 ZMDI, ASI4UC-G1-SR-7 Datasheet - Page 52

• Manufacturer Part Number: ASI4UC-G1-SR-7
• Description: Interface - Specialized ASI
• Manufacturer: ZMDI

Specifications of ASI4UC-G1-SR-7

• 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

3.12.2.
The signal logic of the Addressing Channel follows the definition of a Manchester-II-coded AS-i signal. The
default state (inactive) is defined by a logic high value. Depending on the input mode of the IRD pin
(voltage/current) a logic HIGH is either represented by a voltage signal > 3.5V or an input current of
I
A valid communication is started on a falling edge of the input signal (middle of Start Bit) and ended on a
rising signal edge (middle of End Bit) and followed by the detection of a telegram pause. The information is
represented by falling (=’0’) or rising (=’1’) signal transitions in the middle of every bit time (see Figure 19)
Equivalent to the AS-i input channel, the signals received at the Addressing Channel input (IRD pin) are
checked for telegram transmission errors. The checking, however, is only performed in Slave Mode. In
Master-, Repeater- and Monitor Mode, the IRD signal is checked only for logical correctness. It is directly
forwarded to the AS-i line transmitter avoiding any additional logic delays.
Note: Because the telegram checking is disabled on the Addressing Channel in Master-, Repeater- and
Following telegram transmission errors are detected in Slave Mode:
Start_bit_error
No_information_error
Parity_error
End_bit_error
Length_error
Data Sheet
January 30, 2012
IRD_Offset
Information
Bit Stream
Transmitted
MAN-II-coded
Bit Stream
ASI4U / ASI4U-E
Spec. 3.0 Com
Figure 19: Manchester-II-Modulation principle
Monitor Mode, corresponding Receive Strobe signals are neither displayed at the Parameter Ports nor
generated for internal purposes.
The master control logic must care to deliver correctly timed MAN-signals, ensuring that the resulting
AS-i telegrams fulfill the specified timing limits.
+ I
Addressing Channel
IRD_Amplitude.
© 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 initial signal transition (after a pause) must be of falling edge. Violation of this
rule is detected as Start_bit_error.
Within a received telegram, signal transitions (of rising or falling edge) must occur in
periods of
of this rule is detected as No_information_error.
Note: The Addressing Channel input (IRD) only accepts master requests in Slave
Mode.
The sum of all information bits in master requests (excluding start and end bits,
including parity bit) must be even. Violation of this rule is detected as Parity_error.
The signal transition to be detected 13 * 6 s (78 s) after the initial falling start
transition, shall be of rising slope. Violation of this rule is detected as an
End_bit_error.
Note: This stop transition shall finish the master request.
If during the first bit time after the end bit of a master request (equivalent to the 15
Bit time) for synchronized slaves (during the first three bit times for not synchronized
slaves, equivalent to the Bit times 15 to 17) a signal different from a pause is
detected, a Length_error is detected.
0
(
n
*
6

s
0
)


. 2
. 1
000
000


s
s
after the initial falling slope, where n = 1 ... 13. Violation
1
0
1
Pause
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th