Siemens KNX EIB TP-UART 2-IC Manual page 14

GAMMA instabus
Release: February 2012
KNX EIB TP-UART 2-IC
2.2.10 Pin IND, SMPS-output
The pin IND is the output of the switched mode power supply. Internally the node is clamped to VB-.
The voltages and currents depend on the switched mode power supply concept.
2.2.11 Pin SVCC
This input pin controls the value of VCC. It is possible to switch between 3.3 V and 5 V. If pin SVCC is
connected to VB-, VCC-voltage is 3.3 V. If pin SVCC is connected to VCC, VCC-voltage is 5 V. In any
case it is necessary to connect SVCC to a defined level.
2.2.12 Receive Pin RxIN
The Receive Pin RxIN is coupled to the EIB bus by an external capacitor.
Symbol Parameter
C external coupling capacitance
REC
1) AC coupled by external capacitor 47 nF± 5%
Technical Manual
page 14
Figure 3 V20 Fallback Characteristic
Table 13 Receive Pin RxIN
pages 42
© Siemens AG 2012
Subject to change without further notice.
Min Max Unit
44.5 49.5 nF
Siemens AG
Infrastructure and Cities Sector,
Building Technologies
Control Products and Systems
P. O. Box 10 09 53,
D-93009 Regensburg
Note
typ. 47 nF