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GAMMA instabus
Release: February 2012
KNX EIB TP-UART 2-IC
V
input voltage
IN
V
supply voltage (generated by the ASIC)
VCC[5]
V
supply voltage (generated by the ASIC)
VCC[3]
C
VCC
L
External Inductance
VCC
L
External Inductor
VCC
C
ESR of external storage and load capacitance to
VCCESR
achieve V
ripple1
I
external load at VCC
VCC
with reduced I
1) SVCC connected to VCC
2) SVCC connected to VB-
3) Such as EPCOS SIMID B824432C part No. B824321224K000
4) If series loss resistance
Pin VDP delivers an internally generated supply voltage to internal loads only. The supply is generated
by a series regulator. Internal input voltage for VDP is VDDH. Supply VDP is the positive supply for the
mode control pins and DIV and TSTIN_BDS pins.
V
input voltage
IN
V
Internal supply voltage
C
external storage capacitance
I
external load at VDP
VDP
1) Low ESR < 0.1 Ohms
2) In the application there should be no external load on VDP.
2.2.8 Supply Pins VDDH and VSSH
Pin VDDH and VSSH deliver an internally generated supply voltage to internal loads only. The VDDH
supply is connected to the VSP externally by a short circuit. The VSSH supply is generated by a series
regulator to provide a voltage to control the DC-DC converter. Internal input voltage for VSSH is VDDH
which is supplied from the external voltage VSP.
V
Internal supply voltage
VDDH
V
Internal supply voltage
SSH
C
external storage capacitance
VSSH
I
external load at VSSH
VSSH
I
external load at VDDH
VDDH
1) Low ESR < 0.1 Ohms
page 12
V20
1
an efficiency of typical 80 % will be reached
Table 8 Supply Pin VCC
Table 9 Supply Pin VDP
Table 10 Supply Pins VDDH & VSSH
© Siemens AG 2012
Subject to change without further notice.
6.25
5.0-5%
3.3-5%
8
Series loss resistance
0.3
0
4.75
3.0
176
6.25
V
-3.6
VDDH
176
33
V
5.0+5%
V
3.3+5%
V
18
µF
220
µH
7.5
0.7
30
mA
50
mA
V
V
VSP
3.6
V
264
nF
0
mA
V
V
VSP
V
-3.0
V
VDDH
264
nF
0
mA
0
mA
Control Products and Systems
P. O. Box 10 09 53,
D-93009 Regensburg
1)
2)
3)4)
Note
1)
2)
Note
1)
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