ASI4UC-G1-MT ZMDI, ASI4UC-G1-MT Datasheet - Page 45

• 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

3.8. Fault Indication Input Pin FID
3.8.1.
The fault indication input FID is provided for sensing a periphery fault-messaging signal in Slave Mode. It
contains a high voltage high impedance input stage that influences the status bit S1 of an AS-i Slave directly.
DC properties of the pin are specified at Table 14: DC Characteristics of digital high voltage input pins.
If the FID_Invert flag (Firmware Area of the E²PROM) is not set, a periphery fault is signaled by logic HIGH at
the FID input. In this case S1 and FID are logically equivalent, which is the default state. In the opposite case,
when FID_Invert = ‘1’, the FID input value is inverted before any further processing. The FID_Invert feature
was added to provide special support for certain fault conditions.
Signal transitions at the FID pin become visible in S1 with a slight delay, because a clock synchronizing circuit
is in between.
3.8.2.
In Master- and Monitor Mode the FID input provides a voltage sense comparator for power fail detection. Its
threshold voltage is set to 2.00 V +/-3%.
A power fail event is recognized and displayed at the Parameter Pin P1 if the input voltage falls below the
reference voltage for more than 0.7...0.9 ms. No power fail signal is generated while the IC is performing its
initialization procedure.
Table 26: Power Fail Detection at FID (Master Mode and Monitor Mode)
Symbol Parameter
V
R
t
1
Data Sheet
January 30, 2012
Loff
for the measurement for the AS-I-voltage an external voltage divider is necessary, see Application Notes.
FID-PF
IN-FID
ASI4U / ASI4U-E
Spec. 3.0 Com
Slave Mode
Master- and Monitor Mode
FID reference voltage to detect power fail
Input resistance of FID input
Power supply break down time to generate a Power
Fail Signal
© 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
Min
1.94.
2 Meg
0.7
2.06
Max
0.9
V
Ohms
Unit
ms
Note
1
45 of 63