ASI4UC-G1-SR-7 ZMDI, ASI4UC-G1-SR-7 Datasheet - Page 14

• 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

2
2.1. Functional Block Diagram
ASIP
ASIN
Following device functions are associated with the different blocks of the IC:
Data Sheet
January 30, 2012
CAP
RECEIVE
TRANSMIT
ASI4U / ASI4U-E
Spec. 3.0 Com
Basic Functional Description
ASI4U
PROTECTION
OVERLOAD
THERMAL /
© 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
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changes without notice.
pliant Universal AS-I IC
The receive block converts the analog telegram waveform from the AS-i bus to a digital
pulse coded signal that can be processed further by a digital UART circuit.
The RECEIVE block is directly connected to the AS-i line pins ASIP and ASIN. It converts
the differential AS-i telegram to a single ended signal and removes the DC offset by high
pass filtering. To adapt quickly on changing signal amplitudes in telegrams from different
network users, the amplitude of the first telegram pulse is measured by a 3 bit flash ADC
and the threshold of a positive and a negative comparator is set accordingly to about 50%
of the measured level. The comparators generate the P-Pulse and N-Pulse signals.
The transmit block transforms a digital response signal to a correctly shaped send current
signal which is applied to the AS-i bus. Due to the inductive network behavior of the
network the changing send current induces voltage pulses on the network line that overlay
the DC operating voltage. The voltage pulses shall have sin²-wave shapes. Hence, the
send current shape must follow the integral of the sin²-wave function.
AGND
0V
ELECTRONIC
INDUCTOR
TRANSMIT
RECEIVE
LGND
GND
U
IN
Figure 3 Functional Block Diagram
OVER-LOAD
OVER-HEAT
REC-RESET
P-PULSE
N-PULSE
SEND-SBY
SEND-D
U
OUT
STAGE
CMOS
INPUT
IRD
IRD_IN
Current
INPUT
AC
SUPPLY
POWER
DIGITAL
LOGIC
U5R
LED1 LED2
OUTPUT
STAGE
OSCILLATOR
DIG
OSC1/2
STAGE
INPUT
FID
ANA
DATA-STRB
PARAM
STRB
RESET
OUTPUT
OUTPUT
OUTPUT
STAGE
STAGE
STAGE
STAGE
STAGE
STAGE
INPUT
INPUT
I/O
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DI(3:0)
DSR
PST
P(3:0)