E981.03 Datasheet, PDF (24/51 Pages) ELMOS Semiconductor AG – Autonomous MAC and individual physical address

KNX/ EIB TRANSCEIVER
PRODUCTION DATA - JAN 15, 2015
E981.03
6.12 Save Mode
To enlarge the V_VCC operation time during low bus voltage supply the E981.03 switches some power devices off.
Properties
• KNX/ EIB transmitter is switched off
• The SAVE pin is active low
• KNX/ EIB receiver, UART host and SPI host
interfaces remain active
• V20 is switched off to allow longer VCC active times
7 Data Communication
The general communication between E981.03 and host is realized by using UART services. Furthermore the IC can
be configured via SPI interface.
7.1 UART-Service Host -> UART
Any service sent from host to E981.03 consists of one or more bytes. The first byte is the UART control field which
identifies the type of the requested service. The E981.03 can handle the following service requests:
Table 4. UART Service - Host to E981.03
Service Name
UART control field
Hex Bin
Remarks / Description
followed by n bytes
76543210
U_Reset.request
U_State.request
U_ActivateBusmon
U_AckInformation
U_ProductID.request
U_ActivateBusyMode
U_ResetBusyMode
U_MxRstCnt
U_ActivateCRC
0x01
0x02
0x05
0x10
...
0x17
0x20
0x21
0x22
0x24
0x25
0000 0001
0000 0010
0000 0101
0001 0nba
0010 0000
0010 0001
0010 0010
After receiving a U_Reset.
request the IC transits to
its soft reset state.
The IC answers an U_State.
request service by sending
its communication state
using State.response
service.
n: NACK
b: BUSY
a: ADDRESSED
0: inactive
1: active
The service activates the
KNX Busy Mode in the
E981.03
The host shall synchronize
its receiver before sending
the U_ResetBusyMode.
number of busy and nack
0010 0100 counts (in one byte)
- 0..7 times
0010 0101
Only with baud rates
19.200 or 115.200
B2 B1 B0 0 0 N2 N1 N0
Busy
00
Nack
KNX control field
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
24/51