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KNX EIB TP-UART 2-IC
Symbol
Parameter
V
energy buffer voltage
VSP
V
voltage difference between V
VDIF
C
external storage capacitance
VSP
ESR
ESR of external storage capacitance evaluated @
VSP1
120Hz
ESR
ESR of external storage capacitance evaluated @
VSP2
100kz
1) DC voltage of bus is 20V to 30V.
2) recommended 330 µF; must be larger than the capacitor at VCC
6) It is highly recommended, but not mandatory, that an additional capacitor C
application configuration where capacitors C
placed as close as possible to pin VDDH.
2.2.6 Supply Pin VCC
Pin VCC delivers the internally generated supply voltage to external loads. The supply is generated by
a switched mode power supply (with an internal oscillator, softstart function), current source and shunt
regulator. The voltage of VCC depends on the level of pin SVCC. Internal input voltage for VCC
(switched mode power supply) is VDDH. VCC supply generation is disabled during softstart.
The I
maximum current can be greater than 30mA if the maximum I
VCC
Siemens AG
Infrastructure and Cities Sector,
Building Technologies
Control Products and Systems
P. O. Box 10 09 53,
D-93009 Regensburg
and V
VB+
VSP
is present. When present it is recommended that C
VSP
Table 7 Buffer Voltage Pin VSP
Figure 2 VCC supply external connections
pages 42
© Siemens AG 2012
Subject to change without further notice.
GAMMA instabus
Release: February 2012
Min
Max
V
- V
45
VB+
VDIF
0.5
2
264
0.70
0.20
is included in any
VDDH
current is reduced.
V20
Technical Manual
Unit
Note
V
1)
V
µF
2) 6)
be
VDDH
page 11
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