ASI4UC-G1-MT ZMDI, ASI4UC-G1-MT Datasheet - Page 55

• 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

3.17. Power Supply
The power supply block provides a sensor supply, which is inductively decoupled from the AS-i bus voltage, at
pin UOUT. The decoupling is realized by an electronic inductor circuit, which basically consists of a current
source and a controlling low pass. The time constant of the low pass, that has influence to the resulting input
impedance at pin UIN, can be adjusted by an external capacitor at pin CAP.
The electronic inductor can be turned off if pin CAP is connected to 0V. This shuts down the current source
between UIN and UOUT requiring an external connection between UIN and UOUT for proper IC operation.
The possibility to turn off the electronic inductor is helpful to realize high symmetrical extended power
applications (i.e. AS-i connected actuators with large load currents).
Overloading the electronic inductor for more than 2 seconds by drawing too much current shuts down the
entire IC in order to avoid a deviation of the input impedance, which would have negative influence to the
communication of the remaining AS-i network clients. The fail-safe shutdown mode can only be left by power
cycling the AS-i supply voltage.
A second function of the power supply block is to generate a regulated 5V supply for operation of the internal
logic and some analog circuitry. The voltage is provided at pin U5R an can be used to supply external circuitry
as well, as long as the current requirements stay within in the specified limits. See Table 33 below. Because
the 5V supply is generated out of the decoupled sensor supply at UOUT, the current drawn at U5R has to be
subtracted from the total available load current at UOUT.
The power supply dissipates the major amount of power:
In total, the power dissipation shall not exceed the specified values of chapter 1.1.
To cope with fast internal and external load changes (spikes) external capacitors at UOUT and U5R are
required. The 0V pin defines the ground reference voltage for both UOUT and U5R.
3.17.1.
Table 33: Properties of voltage output pins UOUT and U5R
1
2
Data Sheet
January 30, 2012
Symbol Parameter
V
V
V
V
t
V
I
I
I
I
C
C
C
Parameter copied from Table 2: Operating Conditions
UOUTp
UOUT
5V
o
UOUTS
ASI4U / ASI4U-E
Spec. 3.0 Com
UIN
DROP
UOUT
UOUTp
U5R
BUOUT
B5V
UOUT
= 10µF, output current switches from 0 to I
Ptot = V
Voltage Output Pins UOUT and U5R
Positive supply voltage for IC operation
Voltage drop from pin UIN to pin UOUT
UOUT output supply voltage
UOUT output voltage pulse deviation
UOUT output voltage pulse deviation
width
5V supply voltage
UOUT output supply current
U5R output supply current
Total output current I
Short circuit output current
Blocking capacitance at UOUT
Blocking capacitance at U5R
Drop
© 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
* I
UOUT
+ (V
UOUT
UOUT
-5V) * I
+ I
5V
5V
UOUTmax
Min
16
5.5
V
4.5
0
0
50
10
1
UIN
2
- V
and vice versa
DROPmax
Max
33.1
6.7
V
1.5
2
5.5
55
4
55
470
UIN
2
2
- V
DROPmin
Unit
V
V
V
V
ms
V
mA
mA
mA
mA
µF
µF
Note
1
I
2
2
I
UOUTmax
U5R
V
UIN
= 0
> 22V
55 of 63
2