User Manual
GAMMA instabus
Release: February 2012
KNX EIB TP-UART 2-IC
Siemens AG pages 42 Technical Manual
Infrastructure and Cities Sector,
Building Technologies
Control Products and Systems © Siemens AG 2012 page 17
P. O. Box 10 09 53, Subject to change without further notice.
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2.2.19 Reset Pin RESn
This pin is an I/O pin with internal pullup resistor to VIF. In reset case the reset pin delivers an active
LOW signal to external host electronic. The output driver is realized as open drain. The reset state
RESn = LOW can be caused by an internal or by an external RESET due to forcing an active LOW to
the pin RESn. The switching levels are derived from external supply VIF.
Symbol
Parameter Min Max Unit Note
R
PullUp
value of internal pull-up resistor to VIF 10 25
kΩ
V
RESmax
maximum voltage at RES pin VIF + 0.5 V
V
IL
voltage range for input low level 0 0.3 * VIF
V
IH
voltage range for input high level 0.7 * VIF 1.0 * VIF
V
hyst
hysteresis for switching level 0.1 * VIF 0.4 * VIF 1)
V
OL
output low voltage 0.2 V 2)
t
f
fall time (90 % → 10 %) for VIF = 5.25V
100 ns C
L
=
150 pF
3)
1) switching level approx. VIF/2, i.e. VIF/2 ±V
hyst
/2
2) I
OL
of 1mA when VIF=1V; I
OL
of 5mA when VIF ≥ 3V
3) Rise time determined by R
PullUp
, C
L
and VIF
Table 20 Reset Pin RESn
2.2.20 Mode Control Pins MODE0, MODE1, MODE2, MODE3 TESTMODE and
CTM
These input pins are used to control the mode of the ASIC by connecting them to VB-(0) or VDP(1).
The normal operating mode is reached with MODE0 =1, MODE1 =1, MODE2=0, MODE3=0,
TESTMODE =0 and CTM=0. Section 1.2 “Selection of Different Modes of Operation” shows the
different modes selected by the MODE<0:2> and TESTMODE pins and the usage of the other pins in
these modes.
Symbol Parameter Min Max Unit Note
V
IL
voltage range for input low level 0 0.3 * VDP V
V
IH
voltage range for input high level 0.7 * VDP 1.0 * VDP V
Table 21 Mode Control Pins MODE0, MODE1, MODE2, MODE3, TESTMODE & CTM
2.2.21 Pin TSTIN_BDS
In normal mode it is used as input pin to select the baud rate of the UART interface to the host
electronic.
Symbol Parameter Min Max Unit Note
V
IL
input low level (UART baud rate 19.2 kBaud) 0 0.3 *
VDP
V
IH
input high level (UART baud rate 9.6 kBaud) 0.7 * VDP 1.0 *
VDP
Table 22 Pin TSTIN_BDS