ASI4UC-G1-SR-7 ZMDI, ASI4UC-G1-SR-7 Datasheet - Page 29

• 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

3.3.2.
The IRD input allows direct connection of a Photo-Diode (referencing to 0V) and senses the generated photo
current. A valid input signal has to have certain current amplitude (range) and must not exceed a certain offset
current value (Table 10 and Figure 8).
In contrast to A²SI versions, the IRD input of the ASI4U covers the entire input current range by a single
amplifying stage with continues (logarithmical) gain adaptation. Thus, the cyclical gain switching is avoided
and the IC can react more safely and without delay on different input signal amplitudes.
Table 10: IRD AC current input parameters
Figure 8: Addressing Channel Input (IRD), Photo-current Waveforms
Following photo-diode is suggested for optimal performance:
 TEMIC TEMD5000
3.3.3.
In addition to the AC current input mode, the IRD input can also operate in CMOS input mode. Mode switching
is only possible as long as the IC has not locked to the Addressing Channel by reception of a Magic Sequence
already. On principle, that input mode that lead to the activation of the Addressing Channel will remain locked
until the Addressing Channel is deactivated (by IC Reset).
The CMOS mode is entered if the IRD input voltage is above 2.5V (logic high) for more than 7.680 ms (-
6.66%). It is left, if the IRD input voltage is below 1.0V (logic low) for more than 7.680 ms (-6.66%). The initial
input mode after IC initialization is determined at the end of the initialization phase and depends on the value
of the IRD input signal at that time.
Data Sheet
January 30, 2012
Symbol Parameter
I
I
MIN
I
IRDA
IRDO
IRDA
IRD
input
current
ASI4U / ASI4U-E
Spec. 3.0 Com
4. The UART is constantly set to Synchronous Receive Mode. This is because the signal sequence that
is generated by the handheld programming device exhibits an additional signal transition in a time
frame of 3 bit times after the end of the transmitted master call.
AC Current Input Mode
CMOS Input Mode
Input current offset
Input current 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
MAX
I
IRDA
Min
25
Max
10
100
MAX
I
IRDO
time
Unit
µA
µA
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Note