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| 型号： | MCP3421DM-WS |
| 厂商： | Microchip Technology |
| 文件页数： | 20/42页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO MCP3421 WEIGHT SCALE |
| 标准包装： | 1 |
| 主要目的： | 参考设计，称量台 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | MCP3421，MCP6V07，PIC18F4550 |
| 主要属性： | 2Kg测压元件，灵敏度为1 mV/V |
| 已供物品： | 板，线缆，CD，电源 |
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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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