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AS3955 データシート(PDF) 68 Page - ams AG

部品番号 AS3955
部品情報  NFC Forum Compliant Dynamic Tag
PDF  111 Pages
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メーカー  AMSCO [ams AG]
ホームページ  http://www.ams.com
Logo AMSCO - ams AG

AS3955 データシート(HTML) 68 Page - ams AG

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Page 68
ams Datasheet
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[v1-01] 2015-Apr-29
AS3955 − Detailed Description
EEPROM Write
In order to program an EEPROM block, seven bytes shall be sent
(slave address, mode byte, block address byte and 4 bytes of
data, all of them MSB first). Actual EEPROM programming is
started with rising edge of ACK of the last byte.
Figure 75:
Writing Register Data with Auto-incrementing Address over I²C
EEPROM Read
In order to read data from EEPROM, first a slave address and
mode byte is sent, followed by the block address byte (MSB
first). Then one or more blocks of data with address
auto-incrementing (packets of 4 bytes) are transferred via SDA
line, also MSB first. SDA is sampled at the SCL falling edge. In
case the block on defined address does not exist, all 0 data is
sent via SDA line.
Figure 76:
Reading a EEPROM Block over I²C
A
6
A
5
A
4
A
3
A
2
A
1
A
0
10 0 0 0 0
A
C
K
0
P
S
Data
Slave address
W
A
6
W
A
5
W
A
4
W
A
3
W
A
2
W
A
1
0
A
C
K
W
A
0
x
D
3
D
2
D
1
D
0
A
C
K
D
5
D
4
D
7
D
6
EEPROM page
address
Mode Byte
SCL
SDA
A
C
K
0
A
6
A
5
A
4
A
3
A
2
A
1
A
0
01 1 1 1 1 1
A
C
K
0
S
Slave address
W
A
6
W
A
5
W
A
4
W
A
3
W
A
2
W
A
1
1
A
C
K
W
A
0
x
EEPROM page
address
Mode Byte
SCL
SDA
A
C
K
P
Slave address
A
2
A
1
A
0
1
A
C
K
A
4
A
3
A
6
A
5
S
Data
D
3
D
2
D
1
D
0
N
A
K
D
5
D
4
D
7
D
6



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