Siemens KNX EIB TP-UART 2-IC, Руководство пользователя

Страница: 10 / 42

GAMMA instabus
Release: February 2012
KNX EIB TP-UART 2-IC
Technical Manual pages 42 Siemens AG
Infrastructure and Cities Sector,
Building Technologies
page 10 © Siemens AG 2012 Control Products and Systems
Subject to change without further notice. P. O. Box 10 09 53,
D-93009 Regensburg
(7) For R
th
≤ 28k/W
(8) Valid susceptibility against humidity is described by JEDEC JESD22 A112, table 1, level 5
(9) Max. 5V
2.2.3 Bus Pins VB+ and VB-
Via these pins the ASIC is connected to the bus lines. External diode to prevent reverse bias of ASIC
and external suppressor diode to limit the burst pulses are required.
Symbol Parameter Min Max Unit Note
V
VB+
positive line voltage -0.3 45 V 1)
I
analog
current consumption in analog mode (without
external clock) 1 mA 2) 4)
I
normal
current consumption in normal mode (with external
clock) 1.8 mA 3) 4)
I
analog
current consumption in analog mode (without
external clock) 1 mA 2) 5)
I
normal
current consumption in normal mode (with external
clock) 1.8 mA 3) 5)
1) DC voltage of bus is 20V to 30V. During surge impulse: -20 V for 2 µs and 65 V for 150 µs
2) no load at all (VCC, V20, I/O-pins)
3) 4.915MHz external clock running
4) SVCC connected to VCC (nominal VCC = 5V)
5) SVCC connected to VB- (nominal VCC = 3.3V)
Table 5 Bus Pins VB+ and VB-
2.2.4 CCS stabilisation Pin BYP
The BYP pin drives the control node of the controlled current source (CCS) via a capacitor connected
to the VB+ bus line. This drive is used to ensure that the capacitive loading on the EIB, by the ASIC, is
below a specific value.
Symbol Parameter Min Max Unit Note
V
BYP
Bypass voltage range -0.3 45 V 1)
C
BYP
external coupling capacitance 44.5 49.5 nF typ. 47 nF
1) DC voltage of bus is 20V to 30V. During surge impulse: -20 V for 2 µs and 65 V for 150 µs
Table 6 CCS stabilisation pin BYP
2.2.5 Buffer Voltage Pin VSP
The ASIC delivers a supply voltage of 3.3 or 5 volts to external loads. In order to prevent a rapid
change of bus current in the case of a rapid change of external load an external capacitor at the pin
VSP is used for energy storage. The static voltage at VSP is adjusted to V
VB+
- V
VDIF
. V
VSP
is connected
by a short circuit to pin VDDH externally in the application. VDDH is used as the input for the VCC DC-
DC converter and the VSSH regulator. VSP is used as the input for V20 linear regulator and VDP linear
regulator.