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AS7221 bảng dữ liệu(PDF) 20 Page - ams AG

tên linh kiện AS7221
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AS7221 bảng dữ liệu(HTML) 20 Page - ams AG

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[v1-01] 2016-Dec-08
AS7221 − Detailed Description
I²C Write Access
Byte Write and Page Write formats are used to write data to the
slave.
Figure 23:
I²C Byte Write
Figure 24:
I²C Page Write
The transmission begins with the START condition, which is
generated by the master when the bus is in IDLE state (the bus
is free). The device-write address is followed by the word
address. After the word address any number of data bytes can
be sent to the slave. The word address is incremented internally,
in order to write subsequent data bytes on subsequent address
locations.
For reading data from the slave device, the master has to change
the transfer direction. This can be done either with a repeated
START condition followed by the device-read address, or simply
with a new transmission START followed by the device-read
address, when the bus is in IDLE state. The device-read address
is always followed by the 1st register byte transmitted from the
slave. In Read Mode any number of subsequent register bytes
can be read from the slave. The word address is incremented
internally.
S
SW
A
WA
Data
A P
A
Write WA++
S
SW
A
WA
Data 1
A P
A
Write WA++
……..
A
Data n
A
Write WA++
Write WA++



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