E981.03 Datasheet, PDF (15/51 Pages) ELMOS Semiconductor AG – Autonomous MAC and individual physical address

KNX/ EIB TRANSCEIVER
PRODUCTION DATA - JAN 15, 2015
Table 2. Baud rate configuration
BS1
GND
GND
VIO
VIO
BS0
VIO
GND
GND
VIO
Description
9.6 k baud
19.2 k baud
115.2 k baud
Analog Mode
CRC check useable Remark
No
8 bit, even parity, 1 stop-bit
Yes
8 bit, even parity, 1 stop-bit
Yes
9 bit, even parity, 1 stop-bit
No
E981.03
ST D0 D1 D2 D3 D4 D5 D6 D7 D8 P Sp
ST D0 D1 D2 D3 D4 D5 D6 D7 P Sp
104µs •11Bit = 1,042ms 9.600 Baud
52µs •11Bit = 0,521ms 19.200 Baud
8,7µs •12Bit = 0,104ms 115.200 Baud
ST
D0..D8
P
Sp
Figure 4. UART Bit
Start Bit
Data Bits
Parity Bit
Stop Bit
Low
LSB first
even
High
The bit D8 in 9-bit UART has the following meaning:
0: data byte
1: service byte
5.3 SPI compatible – Interface
E981.03 has a slave SPI compatible - interface to trans-
mit and receive data. The interface can be used alterna-
tively for E981.03 configuration and KNX communica-
tion. In analog mode the interface is the only possibility
to configure parameters like bus current.
To secure SPI compatible communication, a CRC calcula-
tion can also be activated.
The user could switch off the SPI compatible - Interface
by setting ON0 and ON1 to zero (Register SPI_CTRL ). In
this case 4 GPIOS could be used trough the UART – Inter-
face. The GPIOs have VIO related I/O levels.
The pins MOSI and MISO are useable as general purpose
inputs or outputs. The pins SCS and SCK can be used as
input pins. For read and write
5.4 Telegram Transmission
After successful upload of the frame E981.03 sends the
frame on KNX bus after the KNX specified bus
idle time detected.
The repeat flag of the frame transmitted is handled by
the E981.03.
• In first transmission the repeat flag is set to 1.
• In repeated frames the repeat bit is cleared to 0.
The acknowledge frame sent by the receivers of the
frame is checked and
• In case of BUSY acknowledged frames E981.03
waits for at least 150 bit times after the BUSY ac-
knowledge before starting a new transmission at-
tempt. These 150 bit times refer to the end of the
BUSY acknowledged frame independent from other
communication on the EIB bus. In case of bus com-
munication between the two (BUSY) repetitions the
time between the interposed frame and the BUSY
repetition is 50 bit times.
• In case of NACK acknowledged frames E981.03
starts a new transmission attempt.
• No acknowledge and corrupted acknowledge will
be handled as NACK.
• BUSY and NACK acknowledge will be handled as
BUSY.
If the repeat flag in the uploaded frame is not set,
E981.03 will send the frame only once even in case of
not ACK acknowledgment.
The maximum number of repetitions is defined in the
register MAX_RST_CNT and can be modified e.g.
by a host UART service or SPI.
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
15/51