參數(shù)資料
型號： AD7746
廠商： ANALOG DEVICES INC
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 24BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT
封裝： MO-153AB, TSSOP-16
文件頁數(shù)： 17/17頁
文件大?。?/td> 232K
代理商： AD7746
Preliminary Technical Data
AD7745/AD7746
Rev. PrF | Page 9 of 17
GENERAL CALL
When a master issues a slave address consisting of seven zeros
with the eighth bit (R/W bit) set to zero, this is known as the
general call address. The general call address is for addressing
every device connected to the I2C bus. The AD7745/AD7746
will acknowledge this address and read in the following data
byte.
If the second byte is 0x06, the AD7745/AD7746 will reset com-
pletely uploading all default values. The AD7745/AD7746 will
not acknowledge any other general call commands.
AD7745/AD7746 RESET
In order that the AD7745/AD7746 can be reset without having
to reset the entire I2C bus, an explicit reset command is pro-
vided. This uses a particular address pointer word as a
command word to reset the part and upload all default settings.
The reset command address word is 0xBF.
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
02980-
A-
034
Figure 6. 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)
02980-
A-
035
Figure 7. Write and Read Sequences
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