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| 型号： | MCP3421A3T-E/CH |
| 厂商： | Microchip Technology |
| 文件页数： | 24/42页 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT 3.75SPS 1CH SOT23-6 |
| 产品培训模块： | MCP3901 Analog Front End |
| 标准包装： | 1 |
| 位数： | 18 |
| 采样率（每秒）： | 3.75 |
| 数据接口： | I²C，串行 |
| 转换器数目： | 1 |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 标准包装 |
| 输入数目和类型： | 2 个单端，双极；1 个差分，单极 |
| 产品目录页面： | 672 (CN2011-ZH PDF) |
| 其它名称： | MCP3421A3T-E/CHDKR |
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MCP3421
DS22003E-page 30
2009 Microchip Technology Inc.
6.2.3
PRESSURE MEASUREMENT
Figure 6-7 shows an example of measuring the
pressure
using
NPP301
(manufactured
by
GE NovaSensor). No external signal conditioning
circuit is needed by utilizing its internal PGA. The
pressure sensor output is 20 mV/V. This gives 100 mV
of full scale output for VDD of 5V (sensor excitation
voltage). Equation 6-1 shows an example of calculat-
ing the number of output code for the full scale output
of the NPP301.
FIGURE 6-7:
Example of Pressure
Measurement.
EQUATION 6-1:
EXPECTED NUMBER OF
OUTPUT CODE FOR
NPP301 PRESSURE
SENSOR
6.2.4
WHEATSTONE BRIDGE TYPE
SENSORS WITH SIGNAL
CONDITIONING
Wheatstone bridge is one of the most common
configurations in the sensor applications. Strain
gauges and pressure sensors are the common
examples. When the sensor output signal is small and
the common mode noise level is large, it needs a signal
conditioning circuit between the sensor and the
MCP3421. Figure 6-8 and Figure 6-9 show examples
of using the MCP6V01 (high precision auto-zeroed
Op Amp) for the sensor signal conditioning. Figure 6-8
shows the interface circuit with a minimum of compo-
nents between the sensor and the MCP3421, but it is
not symmetric, and therefore, the ADC input becomes
a single ended. On the other hand, the Figure 6-9 has
a symmetric and differential output, but requires more
components.
FIGURE 6-8:
Simple Signal Conditioning
Design with Asymmetric Circuit.
FIGURE 6-9:
High Performance Signal
Conditioning Design with Symmetric Circuit.
NPP301
MCP3421
VIN+
VIN-
VDD
VSS
1
2
3
4
5
6
SCL
SDL
10 F
0.1 F
R
VDD
TO MCU
(MASTER)
VDD
Expected
log
2
100 mV
15.625
μV
PGA
------------------------
Number of Output Code =
Where:
1 LSB
=
15.625 V with 18 Bit configuration.
= 12.64 bits for PGA
=1
= 13.64 bits for PGA
=2
= 14.64 bits for PGA
=4
= 15.64 bits for PGA
=8
VDD
RR
100R
C
MCP6V01
VDD
0.2R
3k
Ω
MCP3421
20 k
Ω
1F
20 k
Ω
1F
VDD
1/2 MCP6V02
200
Ω
200
Ω
3k
Ω
3k
Ω
1F
RR
VDD
10 nF
200
Ω
200
Ω
MCP3421
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相关代理商/技术参数 |
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| MCP3421A5T-E/CH | 制造商:Microchip Technology 功能描述:18-BIT DELTA-SIGMA ADC, SINGLE 制造商:Microchip Technology Inc 功能描述:18-BIT DELTA-SIGMA ADC, SINGLE CHANNEL, 4SPS - Tape and Reel 制造商:Microchip Technology Inc 功能描述:IC ADC 18BIT I2C 4SPS SOT23-6 |
| MCP3421A5T-E/OT | 功能描述:IC ADC 18BIT 3.75SPS SOT23-6 RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| MCP3421A6T-E/CH | 制造商:Microchip Technology 功能描述:18-BIT DELTA-SIGMA ADC, SINGLE 制造商:Microchip Technology Inc 功能描述:18-BIT DELTA-SIGMA ADC, SINGLE CHANNEL, 4SPS - Tape and Reel 制造商:Microchip Technology Inc 功能描述:IC ADC 18BIT I2C 4SPS SOT23-6 |
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