E981.03 Datasheet, PDF (14/51 Pages) ELMOS Semiconductor AG – Autonomous MAC and individual physical address

KNX/ EIB TRANSCEIVER
PRODUCTION DATA - JAN 15, 2015
E981.03
Table 1. Recommended Components
Component Recommended value
Remarks
U1
model: SMAJ43CA, SMBJ43CA
D1
model: BYG21
C_ST
C_CST
C₂₀
L_SPS
C_VCC
C_CVCC
C_CVIO
D_SPS
C_33I
R_TX
C_REC
Q
R 1)
SET
R 1)
VCC
D 1)
VIO
R_TXL
330 µF / 35 V
ESR < 1 Ω
ceramic 100 nF / 35 V
±20%
22 μF / 35 V
ESR < 1 Ohm
330 µH, R_LSPS,typ = 3 Ω,R_LSPS,max = 10 Ω, I_sat,SPS = 160 mA, T_amb < 85 °C ±20%
47 µF / 6 V
0.2 Ω < ESR < 0.8 Ω
ceramic 100 nF / 8V
±20%
ceramic 100 nF / 8V
±20%
40 V, 200 mA, t_rr < 15 ns
ceramic 100 nF
e.g. BAT64
±20%
47 Ω
±5 % / 1 W
Ceramic 56 nF
f = 7.3728 MHz, tolerance 50 ppm
1 kΩ
±10 %
Do not use external capaci-
tors or crystals with internal
capacitors.
1 kΩ
6.2 V, 500 mW
10 kΩ
±1%
1) Only necessary in case of the E981.03 being connected to a separate application module. These components only ensuring to
meet the absolute maximum rating in case of connecting and disconnecting the application module. If the connector guarantees
to connect GND potential first, the ESD protection is not needed.
5 Interfaces Description
5.1 KNX/ EIB – Interface
The KNX/ EIB - Interface is a full compatible KNX TP1
transceiver with autonomous Medium Access Control
and individual physical Address. The telegram on KNX
bus is analyzed and dependent on its contents and
communication mode, the data will be processed.
In Analog Mode, the signals SEND and REC are directly
bypassed to the host UART interface pins RXD and TXD.
5.2 UART – Interface
The E981.03 has a full duplex UART interface to trans-
mit and receive bytes asynchronously. The protocol be-
tween E981.03 and host controller is a two-wire proto-
col with software handshake.
The UART host interface consists of the following three
parts
• UART physical layer realizes media access and bit
decoding / encoding or output driver for KNX by-
pass in Analog Mode
• UART logical layer provides byte framing capabili-
ties
• UART service layer defines control and data access
sequences
To secure UART communication, a CRC calculation for
receive and transmit path can be activated separately.
Elmos Semiconductor AG reserves the right to change the detail specifications as may be required to permit improvements in the design of its products.
Elmos Semiconductor AG
Data Sheet
QM-No.: 25DS0046E.03
14/51