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GAMMA instabus
Release: February 2012
KNX EIB TP-UART 2-IC
Symbol
Parameter
V
voltage range for input low level
IL
V
voltage range for input high level
IH
V
hysteresis for switching level
hyst
R
value of internal pull-down resistor
PullDown
1) switching level approx. VIF/2, i.e. VIF/2 ± V
2.2.17 Interface Pin TxD
The UART interface output pin TxD transmits the information to host electronic. The high output level
is derived from external supply voltage VIF.
In normal mode: LOW pulse at EIB bus
In analog mode: LOW pulse at EIB bus
Symbol
Parameter
V
output voltage high
OH
V
output voltage low
OL
t
t
rise time, fall time (10 % ↔ 90 %)
r,
f
2.2.18 Switching Pin STxO
The switching pin STxO is an open drain output with an external pull-up resistance. It is driven to
provide a high output level during transmission. In all modes where the digital part is active an internal
signal generated by the digital part and used to control the switching of STxO. It switches from LOW to
HIGH before (typ. 500 µs) the first transmit signal. In all modes where the digital part is not active Table
19 Switching Pin STxO applies. The control for the switching of STx0 is derived from the send pulse
width limitation implemented within the analog part. The high output level is derived from an external
supply voltage.
Symbol
Parameter
V
External supply voltage for STx0
STx0
V
output voltage high
OH
V
output voltage low
OL
t
delay time from active RxD to STxO L/H (50%
DELAY
↔ 50%)
t
delay time from inactive RxD to STxO H/L (50%
SENDMAX
↔ 50%)
t
rise time (10 % → 90 %)
r
t
fall time (90 % → 10 %) for V
f
fall time (90 % → 10 %) for V
1) When the digital part is not active the STxO L/H is triggered / retriggered by an active RxD signal.
2) In normal mode the Digital part controls the STxO transitions with regard to the RxD signal.
3) When the digital part is not active.
4) during surge impulse: -20 V for 2 µsec and +65 V for 150 µsec
5) I
and t
are set be external pull-up resistance.
OH
r
Technical Manual
page 16
/2
hyst
Table 17 Interface Pin RxD
TxD3 = HIGH
TxD3 = HIGH
Table 18 Interface Pin TxD
=30V
STx0
=5.25V
STx0
Table 19 Switching Pin STxO
pages 42
© Siemens AG 2012
Subject to change without further notice.
Min
Max
0.3 * VIF
0.7 * VIF
0.1 * VIF
0.4 * VIF
150
450
TxD = LOW
TxD = HIGH
Min
Max
VIF - 0.5
0.4
100
Min
Max
VIF
50
50
0.4
300
1.5
2
900
100
Infrastructure and Cities Sector,
Building Technologies
Control Products and Systems
D-93009 Regensburg
Unit
Note
1)
kΩ
Unit
Note
V
I
= -5 mA
OH
V
I
= 5 mA
OL
ns
C
= 150 pF
L
Unit
Note
V
4)
V
4) 5)
V
I
= 5 mA
OL
ns
1) 2)
ms
3)
ns
5)
ns
C
= 150 pF
L
ns
C
= 150 pF
L
Siemens AG
P. O. Box 10 09 53,
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