ASI4UC-G1-SR-7 ZMDI, ASI4UC-G1-SR-7 Datasheet - Page 27

• 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
3.1. AS-i Receiver
The receiver detects (telegram) signals at the AS-i line, converts them to digital pulses and forwards them to
the UART for further processing. The receiver is internally connected between the ASIP and ASIN pins. It
supports floating (ground free) input signals within the voltage limits of ASIP and ASIN given in Table 2 at
page 11.
Functional, the receiver removes the DC value of the input signal, band-pass filters the AC signal and extracts
the digital output signals from the sin
pulse determines the threshold level for all following pulses. This amplitude is digitally filtered to guarantee
stable conditions and to suppress burst spikes. This approach combines a fast adaptation to changing signal
amplitudes with a high detection safety. The comparators are reset after every detection of a telegram pause
at the AS-i line. When the receiver is turned on, the transmitter is turned off to reduce the power consumption.
Table 8: Receiver Parameters
3.2. AS-i Transmitter
The transmitter draws a modulated current between ASIP and ASIN to generate the communication signals.
The shape of the current corresponds to the integral of a sin
DAC and a high current driver. The driver requires a small bias current to flow. The bias current is ramped up
slowly a certain time before the transmission starts so that any false voltage pulses on the AS-i line are
avoided.
designed to allow input voltages different from IC ground at the ASIN pin. The limits given in Table 2 at page
11 apply. When the transmitter is turned on, the receiver is turned off to reduce the power consumption.
Table 9: Transmitter Current Amplitude
Symbol Parameter
I
Data Sheet
January 30, 2012
To support high symmetry extended power applications as shown in Figure 21 at page 58, the transmitter is
Symbol
V
V
SIG
ASI4U / ASI4U-E
Spec. 3.0 Com
SIG
LSIGon
Detailed Functional Description
The IC determines the
amplitude of the first
negative pulse of the
AS-i telegram. This
amplitude is asserted
to be V
Modulated transmitter peak current swing (between ASIP and
ASIN)
Parameter
AC signal peak-peak amplitude (between ASIP and ASIN)
Receiver comparator threshold level (refer to Figure 7)
SIG
DC level
/ 2.
© 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
Figure 7: Receiver comparator threshold set-up in principle
2
-shaped input pulses by a set of comparators. The amplitude of the first
AS-i telegram
First negative
pulse of the
V
LSIGon
2
-function. The transmitter comprises a current
V
LSIGon
= (0.45 ... 0.55) * V
Min
3
45
Min
55
V
SIG
Max
8
55
/ 2
Max
68
Unit
V
%
PP
Unit
mA
SIG
Note
Related
pulse amplitude
P
/ 2
Note
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