SAP51C-B-G1-T ZMDI, SAP51C-B-G1-T Datasheet - Page 29

• Manufacturer Part Number: SAP51C-B-G1-T
• Description: Interface - Specialized ASI
• Manufacturer: ZMDI

Specifications of SAP51C-B-G1-T

• Rohs: yes
• Product Type: Actuator Sensor Interface IC
• Operating Supply Voltage: 16 V to 34 V
• Supply Current: 6 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOP-16
• Minimum Operating Temperature: - 25 C

4
4.1. 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 CDC.
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 (Table 2 at page 10). 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 LTGN pin defines the ground reference voltage for both UOUT and U5R.
4.1.1.
Table 12: Properties of voltage output pins UOUT and U5R
1
2
3
Data Sheet
October 20, 2011
Ptot = V
Symbol Parameter
V
V
V
V
t
V
I
I
I
C
C
The actual voltage drop increases with increasing load current at Uout
C
Parameter copied from
UOUTp
UOUT
5V
o
SAP5S / SAP51
Universal Actuator-Sensor Interface IC
UIN
DROP
UOUT
UOUTp
U5R
BUOUT
B5V
UOUT
= 10µF, output current switches from 0 to I
Detailed Functional Description
Voltage Output Pins UOUT and U5R
Drop
Positive supply voltage for IC
operation
Voltage drop from pin LTGP 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
Blocking capacitance at UOUT
Blocking capacitance at U5R
* (I
UOUT
© 2011 Zentrum Mikroelektronik Dresden AG — Rev. 3.0
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.
+ I
5V
) + (V
Table 2
UOUT
UOUT
at page
-5V) * I
+ I
5V
10
5V
UOUTmax
V
UIN
- V
4.75
100
Min
16
5.2
10
0
0
and vice versa
DROPmax
V
UIN
- V
5.25
Max
470
1.5
55
34
7.8
60
2
4
DROPmin
Unit
mA
mA
mA
ms
µF
nF
V
V
V
V
V
V
Uin>24V
UIN
I
I
UOUTmax
U5R
Note
> 22V
1
2
3
3
29 of 63
= 0