參數(shù)資料
型號(hào)： AD7746ARUZ-REEL
廠商： Analog Devices, Inc.
元件分類： 溫度/濕度傳感器
英文描述： 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
中文描述： 24位的電容數(shù)字轉(zhuǎn)換器的溫度傳感器
文件頁數(shù)： 13/28頁
文件大?。?/td> 391K
代理商： AD7746ARUZ-REEL
AD7745/AD7746
If a repeated start condition is encountered after the address
pointer byte, all peripherals connected to the bus respond
exactly as outlined above for a start condition, that is, a repeated
start condition is treated the same as a start condition. When a
master device issues a stop condition, it relinquishes control of
the bus, allowing another master device to take control of the
bus. Hence, a master wanting to retain control of the bus issues
successive start conditions known as repeated start conditions.
AD7745/AD7746 RESET
To reset the AD7745/AD7746 without having to reset the entire
I
2
C bus, an explicit reset command is provided. This uses a
particular address pointer word as a command word to reset the
part and upload all default settings. The AD7745/AD7746 do
not respond to the I
2
C bus commands (do not acknowledge)
during the default values upload for approximately 150 μs
(max 200 μs).
The reset command address word is 0xBF.
Rev. 0| Page 13 of 28
GENERAL CALL
When a master issues a slave address consisting of seven 0s with
the eighth bit (R/W bit) set to 0, this is known as the general call
address. The general call address is for addressing every device
connected to the I
2
C bus. The AD7745/AD7746 acknowledge
this address and read in the following data byte.
If the second byte is 0x06, the AD7745/AD7746 are reset,
completely uploading all default values. The AD7745/AD7746
do not respond to the I
2
C bus commands (do not acknowledge)
during the default values upload for approximately 150 μs (max
200 μs).
The AD7745/AD7746 do not acknowledge any other general
call commands.
1–7
8
9
1
–7
8
9
1–7
8
9
P
S
START ADDR R/W ACK SUBADDRESS ACK
DATA
ACK
STOP
SDATA
SCLOCK
0
Figure 24. Bus Data Transfer
DATA
A(S)
S
SLAVE ADDR
A(S)
SUB ADDR
A(S)
LSB = 0
LSB = 1
DATA
P
S
SLAVE ADDR
A(S)
SUB ADDR
A(S) S
SLAVE ADDR
A(S)
DATA
A(M)
DATA
P
WRITE
SEQUENCE
READ
SEQUENCE
A(S) = NO-ACKNOWLEDGE BY SLAVE
A(M) = NO-ACKNOWLEDGE BY MASTER
A(S) = ACKNOWLEDGE BY SLAVE
A(M) = ACKNOWLEDGE BY MASTER
S = START BIT
P = STOP BIT
A(S)
A(M)
0
Figure 25. Write and Read Sequences
相關(guān)PDF資料
PDF描述
AD7745 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
AD7745ARUZ 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
AD7745ARUZ-REEL 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
AD7745ARUZ-REEL7 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
AD7746ARUZ 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
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