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參數(shù)資料
| 型號： | ADS1000A0IDBVR |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | LOW POWER, 12-Bit ANALOG-TO-DIGITAL CONVERTER with I2C⑩ INTERFACE |
| 中文描述： | 低功耗，12位模擬數(shù)字轉(zhuǎn)換接口的I2C⑩ |
| 文件頁數(shù)： | 12/17頁 |
| 文件大?。?/td> | 240K |
| 代理商： | ADS1000A0IDBVR |
www.ti.com
CONNECTING MULTIPLE DEVICES
Connecting two ADS1000s to a single bus is almost
trivial. An example showing two ADS1000s and one
ADS1100 connected on a single bus is shown in
Figure 10
. Multiple devices can be connected to a
single
bus
(provided
that
different).
1
2
3
6
5
4
V
IN
-
V
IN+
SCL
GND
V
DD
SDA
ADS1000
V
DD
Microcontroller or
Microprocessor
with I C Port
SCL
SDA
NOTE: ADS1000 power
and input connections
omitted for clarity.
1
2
3
6
5
4
SDA
SCL
I C Pull-Up Resistors
1k
to 10k
W
(typ.)
W
V
DD
Microcontroller or
Microprocessor
with I C Port
V
IN
-
V
IN+
SCL
GND
V
DD
SDA
ADS1000A0
1
2
3
6
5
4
V
IN
-
V
IN+
SCL
GND
V
DD
SDA
ADS1000A1
1
2
3
6
5
4
V
IN
-
V
IN+
SCL
GND
V
DD
SDA
ADS1100A2
NOTE: ADS1000 power
and input connections
omitted for clarity.
USING GPIO PORTS FOR I
2
C
Most
microcontrollers
input/output pins that can be set in software to act as
inputs or outputs. If an I
2
C controller is not available,
the ADS1000 can be connected to GPIO pins, and
the I
2
C bus protocol simulated, or bit-banged, in
software. An example of this for a single ADS1000 is
shown in
Figure 11
.
SINGLE-ENDED INPUTS
Although the ADS1000 has a fully differential input, it
can easily measure single-ended signals. A simple
single-ended
connection
Figure
12
.
The
ADS1000
single-ended measurement by grounding either of its
ADS1000
SBAS357–SEPTEMBER 2006
their
addresses
are
Note that only one set of pull-up resistors is needed
per bus. A user might find that he or she needs to
lower
the
pull-up
resistor
compensate
for
the
additional
presented by multiple devices and increased line
length.
values
bus
slightly
capacitance
to
Figure 11. Using GPIO with a Single ADS1000
Bit-banging I
2
C with GPIO pins can be done by
setting the GPIO line to zero and toggling it between
input and output modes to apply the proper bus
states. To drive the line low, the pin is set to output a
'0'; to let the line go high, the pin is set to input.
When the pin is set to input, the state of the pin can
be read; if another device is pulling the line low, this
device will read as a '0' in the port input register.
Note that no pull-up resistor is shown on the SCL
line. In this simple case, the resistor is not needed;
the microcontroller can simply leave the line on
output, and set it to '1' or '0' as appropriate. It can do
this because the ADS1000 never drives its clock line
low. This technique can also be used with multiple
devices, and has the advantage of lower current
consumption
resulting
from
resistive pull-up.
the
absence
of
a
If there are any devices on the bus that may drive
their clock lines low, the above method should not be
used; the SCL line should be high-Z or zero and a
pull-up resistor provided as usual. Note also that this
cannot be done on the SDA line in any case,
because the ADS1000 does drive the SDA line low
from time to time, as all I
2
C devices do.
Figure 10. Connecting Multiple ADS1000s
Some microcontrollers have selectable strong pull-up
circuits built into the GPIO ports. In some cases,
these can be switched on and used in place of an
external pull-up resistor. Weak pull-ups are also
provided on some microcontrollers, but usually these
are too weak for I
2
C communication. If there is any
doubt about the matter, test the circuit before
committing it to production.
have
programmable
scheme
is
shown
in
is
configured
for
12
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS1000A0IDBVRG4 | LOW POWER, 12-Bit ANALOG-TO-DIGITAL CONVERTER with I2C⑩ INTERFACE |
| ADS1000A0IDBVT | LOW POWER, 12-Bit ANALOG-TO-DIGITAL CONVERTER with I2C⑩ INTERFACE |
| ADS1000A0IDBVTG4 | LOW POWER, 12-Bit ANALOG-TO-DIGITAL CONVERTER with I2C⑩ INTERFACE |
| ADSP-2100AJG | Circular Connector; No. of Contacts:66; Series:MS27473; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:18; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:18-35 RoHS Compliant: No |
| ADSP-2100AKG | Crimp Socket Contact Power Connection Type:Crimp Contact |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS1000A0IDBVRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low Power 12-Bit 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 |
| ADS1000A0IDBVT | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit ADC with I2C Interface 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 |
| ADS1000A0IDBVT | 制造商:Texas Instruments 功能描述:A/D Converter (A-D) IC |
| ADS1000A0IDBVTG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit ADC with I2C Interface 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 |
| ADS1000A0QDBVRQ1 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC AC Lo Cost 12B ADC 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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