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參數(shù)資料
| 型號(hào)： | ADS7823EB250 |
| 英文描述： | 12-Bit, Sampling A/D Converter with I2C?? INTERFACE |
| 中文描述： | 12位，采樣A / D轉(zhuǎn)換器，帶有I2C？？接口 |
| 文件頁(yè)數(shù)： | 10/15頁(yè) |
| 文件大?。?/td> | 275K |
| 代理商： | ADS7823EB250 |
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ADS7823
SBAS180B
10
MSB
6
5
4
3
2
1
LSB
0
0
0
X
X
X
X
X
MSB
6
5
4
3
2
1
LSB
1
0
0
1
0
A1
A0
R/W
ADDRESS 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 ADS7823 deter-
mine these two bits of the device address for a particular
ADS7823. 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 V
DD
or digital
ground. The device address is set by the state of these pins
upon power-up of the ADS7823.
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 ADS7823 monitors the
SDA bus, checking the device type identifier being transmit-
ted. Upon receiving the 10010 code, the appropriate device
select bits, and the
bit, the slave device outputs an
acknowledge signal on the SDA line.
The ADS7823 operating mode is determined by a command
byte.
The ADS7823 command byte simply consists of three zeros
in the most significant bits, while the remaining 5 bits are
don
’
t cares.
INITIATING CONVERSION
Provided the master has write-addressed it, the ADS7823
turns on the A/D converter section and begins conversions
when it receives bit 5 of the command byte shown in the
Command Byte. If the command byte is correct, the ADS7823
will return an ACK condition.
The converter will ignore any wrong command byte (that is,
setting any of the top three MSBs to 1), remain in the A/D
converter power-down mode, and reset the internal 4-word
stack.
The ADS7823 will ignore a second valid command byte if two
valid commands are issued consecutively. The ADS7823 will
respond with a not-acknowledge, and will go to the A/D con-
verter power-down mode after the responded not-acknowledge.
COMMAND BYTE
FIGURE 3. Typical Read Sequence in F/S Mode.
NOTES: (A) Failure for master to send read-addressing byte
—
setting R/W flag to
“
1
”—
will result in internal clock remaining ON, increasing power consumption.
(B) Use repeated START to secure bus operation and loop back to the stage of write-addressing for next conversion.
Sr
1
0
0
1
0
A1
A0
R
A
0
0
0
0
D11D10D9
D8
A
D7D6 . . .D1D0
N
P
S
A1
1
0
0
1
0
A0
W
A
0
0
0
X
X
X
X
X
A
ADC Power-Down Mode
ADC Wake-Up Mode
Write-Addressing Byte
Command Byte
(See
Note B)
Read-Addressing Byte
(see Note A)
Max. 4
×
[2
×
(8 bits + ack/not-ack)]
From master to slave
From slave to master
ADC Power-Down Mode
A = acknowledge (SDA Low)
N = not-acknowledge (SDA High)
S = START Condition
P = STOP Condition
Sr = repeated START Condition
W = 0 (WRITE)
R = 1 (READ)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7823EB2K5 | 制造商:BB 制造商全稱:BB 功能描述:12-Bit, Sampling A/D Converter with I2C?? INTERFACE |
| ADS7824 | 制造商:BB 制造商全稱:BB 功能描述:4 Channel, 12-Bit Sampling CMOS A/D Converter |
| ADS7824P | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 4-Channel 12-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7824P | 制造商:BURR-BROWN 功能描述:IC 12BIT ADC 7824 DIP28 制造商:Texas Instruments 功能描述:IC 12BIT ADC 40KHZ 7824 DIP28 制造商:Texas Instruments 功能描述:IC, 12BIT ADC, 40KHZ, 7824, DIP28 |
| ADS7824PB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 4-Channel 12-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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