User Manual

GAMMA instabus
Release: February 2012
KNX EIB TP-UART 2-IC
Technical Manual pages 42 Siemens AG
Infrastructure and Cities Sector,
Building Technologies
page 18 © Siemens AG 2012 Control Products and Systems
Subject to change without further notice. P. O. Box 10 09 53,
D-93009 Regensburg
2.2.22 Pin TSTOUT_TW
TW = HIGH means: chip temperature is higher than maximum allowed value and TxO is disabled.
Symbol Parameter Min Max Unit Note
V
OH
Output HIGH voltage VIF - 0.5 V I
OH
= -5 mA
V
OL
Output LOW voltage 0.4 V I
OL
= 5 mA
t
r,
t
f
rise time, fall time (10 % ↔ 90 %)
100 ns C
L
= 150 pF
Table 23 Pin TSTOUT_TW
2.2.23 Pin SAVE
This pin is an open drain output with internal pull-up resistor to VIF.
In case of break-down of the bus voltage for more than typ. 1.5 ms (save condition) this pin delivers an
active LOW signal to external host electronic.
Symbol Parameter Min Max Unit Note
R
PullUp
Value of internal pull-up resistor to VIF 10 25
kΩ
V
max
maximum voltage at SAVE pin VIF + 0.5 V
V
OL
output low voltage 0.2 V 1)
t
FRG2
Delay from VB+ break-down to SAVE= LOW
(= debounce time of internal signal FRG2)
0.7 3 ms Typ. 1.5 ms
t
f
fall time (90 % → 10 %)
100 ns C
L
= 150 pF 2)
1) I
OL
of 1mA when VIF=1V; I
OL
of 5mA when VIF ≥ 3V
2) Rise time determined by R
PullUp
, C
L
and VIF
Table 24 Pin SAVE
2.2.24 Pin DIV
This input pin activates an internal 2:1 clock divider. If a 4.9152 MHz clock is used (quartz or external
clock) then pin DIV must be connected to VDP. If an 2.4576 MHz clock is used (only external clock)
then this pin must be connected to VB-.
Symbol Parameter Min Max Unit Note
V
IL
voltage range for input low level 0 0.3 * VDP
V
IH
voltage range for input high level 0.7 * VDP 1.0 * VDP
Table 25 Pin DIV