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| 型号： | MCP3421EV |
| 厂商： | Microchip Technology |
| 文件页数： | 20/42页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR MCP3421 SOT23-6 |
| 产品培训模块： | MCP3901 Analog Front End |
| 设计资源： | MCP3421EV Gerber Files |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 18 |
| 采样率（每秒）： | 4 |
| 数据接口： | 串行 |
| 输入范围： | ±2.5 V |
| 工作温度： | -40°C ~ 125°C |
| 已用 IC / 零件： | MCP3421 |
| 已供物品： | 2 板，CD |
| 产品目录页面： | 672 (CN2011-ZH PDF) |
| 相关产品： | MCP3421A5T-E/OTDKR-ND - IC ADC 18BIT 3.75SPS SOT23-6 MCP3421A3T-E/CHTR-ND - IC ADC 18BIT 3.75SPS 1CH SOT23-6 MCP3421A2T-E/CHTR-ND - IC ADC 18BIT 3.75SPS 1CH SOT23-6 MCP3421A1T-E/CHTR-ND - IC ADC 18BIT 3.75SPS 1CH SOT23-6 MCP3421A0T-E/CHTR-ND - IC ADC 18BIT 3.75SPS 1CH SOT23-6 MCP3421A0T-E/OTDKR-ND - IC ADC 18BIT 3.75SPS 1CH SOT23-6 MCP3421A0T-E/OTCT-ND - IC ADC 18BIT 3.75SPS 1CH SOT23-6 MCP3421A0T-E/OTTR-ND - IC ADC 18BIT 3.75SPS 1CH SOT23-6 MCP3421A5T-E/OTCT-ND - IC ADC 18BIT 3.75SPS SOT23-6 MCP3421A5T-E/OTTR-ND - IC ADC 18BIT 3.75SPS SOT23-6 |
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2009 Microchip Technology Inc.
DS22003E-page 27
MCP3421
6.0
BASIC APPLICATION
CONFIGURATION
The MCP3421 can be used for various precision
analog-to-digital converter applications. The device
operates
with
very
simple
connections
to
the
application circuit. The following sections discuss the
examples of the device connections and applications.
6.1
Connecting to the Application
Circuits
6.1.1
BYPASS CAPACITORS ON VDD PIN
For an accurate measurement, the application circuit
needs a clean supply voltage and must block any noise
signal to the MCP3421 device. Figure 6-1 shows an
example of using two bypass capacitors (a 10 F
tantalum capacitor and a 0.1 F ceramic capacitor) on
the VDD line of the MCP3421. These capacitors are
helpful to filter out any high frequency noises on the
VDD line and also provide the momentary bursts of
extra currents when the device needs from the supply.
These capacitors should be placed as close to the VDD
pin as possible (within one inch). If the application
circuit has separate digital and analog power supplies,
the VDD and VSS of the MCP3421 device should reside
on the analog plane.
6.1.2
CONNECTING TO I2C BUS USING
PULL-UP RESISTORS
The SCL and SDA pins of the MCP3421 are open-drain
configurations. These pins require a pull-up resistor as
shown in Figure 6-1. The value of these pull-up
resistors depends on the operating speed and loading
capacitance of the I2C bus line. Higher value of pull-up
resistor consumes less power, but increases the signal
transition time (higher RC time constant) on the bus.
Therefore, it can limit the bus operating speed. The
lower value of resistor, on the other hand, consumes
higher power, but allows higher operating speed. If the
bus line has higher capacitance due to long bus line or
high number of devices connected to the bus, a smaller
pull-up resistor is needed to compensate the long RC
time constant. The pull-up resistor is typically chosen
between 5 k
Ω and 10 kΩ ranges for standard and fast
modes.
FIGURE 6-1:
Typical Connection
Example.
The number of devices connected to the bus is limited
only by the maximum bus capacitance of 400 pF. The
bus loading capacitance affects on the bus operating
speed. Figure 6-2 shows an example of multiple device
connections.
FIGURE 6-2:
Example of Multiple Device
Connection on I2C Bus.
VIN+
VIN-
VDD
VSS
1
2
3
4
5
6
SCL
SDL
Rp
Input Signals
VDD
TO MCU
(MASTER)
RP is the pull-up resistor:
5k
Ω - 10 kΩ for f
SCL
= 100 kHz to 400 kHz
C1: 0.1 F, Ceramic capacitor
C2: 10 F, Tantalum capacitor
Rp
C1
C2
MCP3421
SDA
SCL
Microcontroller
Temperature
(PIC16F876)
MCP4725
Sensor
(
MCP9804)
MCP3421
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|---|---|
| MCP3422 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:18-Bit, Multi-Channel ???￡ Analog-to-Digital Converter with I2Ca?￠ Interface and On-Board Reference |
| MCP3422A0-E/MC | 功能描述:模数转换器 - ADC 18B delta-sigma ADC dual Ch 4sps RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MCP3422A0-E/MF | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:18-Bit, Multi-Channel ???￡ Analog-to-Digital Converter with I2Ca?￠ Interface and On-Board Reference |
| MCP3422A0-E/MS | 功能描述:模数转换器 - ADC 18B delta-sigma ADC dual Ch 4sps RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MCP3422A0-E/SL | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:18-Bit, Multi-Channel ???￡ Analog-to-Digital Converter with I2Ca?￠ Interface and On-Board Reference |
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