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AS8228 Datasheet(PDF) 99 Page - ams AG

Part # AS8228
Description  Highly Integrated Single Phase 2 Current Energy Metering Integrated Circuits
PDF  123 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS8228 Datasheet(HTML) 99 Page - ams AG

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Data Sheet AS8218 / AS8228
Revision 3.0, 31-May-06
Page 99 of 123
Note: It would also be possible to write to the EEPROM via the UART2 and the MCU, but then a dedicated
MCU program is required to handle the data flow.
Transmission Protocol:
In order to make the data transfer easier for the system control a defined protocol is used for talking to the
UART1, where the length of the data to be written to the EEPROM is specified at the beginning of the
transmission. The protocol is as follows:
Write Command
(8 bits)
7
0
1
2
3
4
5
6
15
8
9
10
11
12
13
14
7
0
1
2
3
4
5
6
Start Address
(16 bits)
15
8
9
10
11
12
13
14
7
0
1
2
3
4
5
6
Block Length
(16 bits)
Data
7
0
1
2
3
4
5
6
...
Acknowledge
7
0
1
2
3
4
5
6
(TXD)
Notes:
1) When ‘enable_crc’ is set to 0 the UART1 only sends back the acknowledge word (FAh).
2) When ‘enable_crc’ is set to 1 a 16-bit checksum has to be transferred to the UART1 at the end of the data
stream. The SCT will calculate the checksum and depending on the result it will send back the
acknowledge word (FAh) or the not-acknowledge word (FBh).
Read from EEPROM
If it is required to read out the EEPROM data this can also be done using the UART1 interface. The following
diagram shows the main blocks involved:
UART1
SCT
SPI
EEPROM
RXD
S_N
SO
SC
SI
TXD
Again it would also be possible to do this using UART2 and MCU.
Transmission Protocol:
In order to make the data transfer easier for the system control a defined protocol is used for talking to the
UART1, where the length of the data to be read from the EEPROM is specified at the beginning of the
transmission. The protocol is as follows:
Data
7
0
1
2
3
4
5
6
...
Read Command
(8 bits)
7
0
1
2
3
4
5
6
15
8
9
10
11
12
13
14
7
0
1
2
3
4
5
6
Start Address
(16 bits)
15
8
9
10
11
12
13
14
7
0
1
2
3
4
5
6
Block Length
(16 bits)
(TXD)



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