Siemens KNX EIB TP-UART 2-IC - Layout Guidelines

GAMMA instabus
Release: February 2012
KNX EIB TP-UART 2-IC
Technical Manual pages 42 Siemens AG
Infrastructure and Cities Sector,
Building Technologies
page 40 © Siemens AG 2012 Control Products and Systems
Subject to change without further notice. P. O. Box 10 09 53,
D-93009 Regensburg
7.1.2 Mode of Operation – Analog
V20
C7
22u/ 35V
U2
SMAJ43CA
D1
BYG21M
A
B
C3
10u
C4
330u/35V
R1
68/1W
RESn
VCC
GND
TxD3
RxD3
C5
10n
C6
10n
SAVE
TW
C8
220n
C9
220n
1)
NC0 R20 V20
RxIN
10
11
IND
12
13
VB+
14
VB
15
TxO
16
VDP
34
33
32
31
30
29
28
STxO
17
18
35
36
TSTIN_ BDS
TESTMODE
MODE 0
MODE 1
MODE 2
MODE 3
CTM
DIV
NC3
+
+
+
1)
C1
47n/
50V
VIF
VB
CBYP
47n/
50V
BYP
2. recommended (close to Pins VDDH and VCC)
3. The maximum average power dissipation of the transmitting resistance R1 of 1 W is
valid for an active telegram rate of 50 %.
Figure 11 Mode of Operation – Analog
7.2 Layout Guidelines
The guidelines related to Figure 7 Mode of Operation – Normal.
Nr. Component Layout Guidelines Priority
1 C9 As close as possible to VDP and GND 1
2 C8 As close as possible to VSSH and VDDH 2
3 L1 As close as possible to IND and GND 2
4 C5 As close as possible to VCC and GND 2