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ADS7828 bảng dữ liệu(PDF) 11 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  12-Bit, 8-Channel Sampling ANALOG-TO-DIGITAL CONVERTER with I2C Interface
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ADS7828
11
SBAS181C
www.ti.com
ADDRESS BYTE
COMMAND BYTE
The address byte is the first byte received following the
START condition from the master device. The first five bits
(MSBs) of the slave address are factory pre-set to 10010.
The next two bits of the address byte are the device select
bits, A1 and A0. Input pins (A1-A0) on the ADS7828 deter-
mine these two bits of the device address for a particular
ADS7828. A maximum of four devices with the same pre-set
code can therefore be connected on the same bus at one
time.
The A1-A0 Address Inputs can be connected to VDD or digital
ground. The device address is set by the state of these pins
upon power-up of the ADS7828.
The last bit of the address byte (R/W) defines the operation
to be performed. When set to a ‘1’ a read operation is
selected; when set to a ‘0’ a write operation is selected.
Following the START condition the ADS7828 monitors the
SDA bus, checking the device type identifier being transmit-
ted. Upon receiving the 10010 code, the appropriate device
select bits, and the R/W bit, the slave device outputs an
acknowledge signal on the SDA line.
MSB
65
4321
LSB
SD
C2
C1
C0
PD1
PD0
X
X
The ADS7828 operating mode is determined by a command
byte which is illustrated above.
SD: Single-Ended/Differential Inputs
0: Differential Inputs
1: Single-Ended Inputs
C2 - C0: Channel Selections
PD1 - 0: Power-Down Selection
X: Unused
See Table I for a power-down selection summary.
See Table II for a channel selection control summary.
MSB
654321
LSB
10010
A1
A0
R/W
PD1
PD0
DESCRIPTION
0
0
Power Down Between A/D Converter Conversions
0
1
Internal Reference OFF and A/D Converter ON
1
0
Internal Reference ON and A/D Converter OFF
1
1
Internal Reference ON and A/D Converter ON
CHANNEL SELECTION CONTROL
SD
C2
C1
C0
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
00
0
0
+IN
–IN
——
——
00
0
1
——
+IN
–IN
——
——
00
1
0
———
+IN
–IN
——
00
1
1
———
+IN
–IN
01
0
0
–IN
+IN
——
——
01
0
1
——
–IN
+IN
——
——
01
1
0
———
–IN
+IN
——
01
1
1
———
–IN
+IN
10
0
0
+IN
——
——
–IN
10
0
1
——
+IN
——
–IN
10
1
0
———
+IN
——
–IN
10
1
1
———
+IN
—–IN
11
0
0
+IN
——
——
–IN
11
0
1
——
+IN
——
——
–IN
11
1
0
———
+IN
——
–IN
11
1
1
———
+IN
–IN
TABLE II. Channel Selection Control Addressed by Command Byte.
TABLE I. Power-Down Selection


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