參數(shù)資料
型號(hào)： MCP3424T-E/SL
廠商： Microchip Technology
文件頁(yè)數(shù)： 25/58頁(yè)
文件大?。?/td> 0K
描述： IC ADC 18BIT 3.75SPS 4CH 14-SOIC
產(chǎn)品培訓(xùn)模塊： MCP3901 Analog Front End
標(biāo)準(zhǔn)包裝： 2,600
位數(shù)： 18
采樣率（每秒）： 3.75
數(shù)據(jù)接口： I²C，串行
轉(zhuǎn)換器數(shù)目： 1
電壓電源： 單電源
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 14-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 14-SOIC
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 8 個(gè)單端，雙極；4 個(gè)差分，雙極
配用： MCP3424EV-ND - EVALUATION BOARD FOR MCP3424
其它名稱： MCP3424T-E/SLTR
2009 Microchip Technology Inc.
DS22088C-page 31
MCP3422/3/4
6.0
BASIC APPLICATION
CONFIGURATION
The MCP3422/3/4 devices can be used for various
precision
analog-to-digital
converter
applications.
These devices operate 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 MCP3422/3/4 devices. 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 MCP3424. 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 MCP3422/3/4 devices should
reside on the analog plane.
6.1.2
CONNECTING TO I2C BUS USING
PULL-UP RESISTORS
The SCL and SDA pins of the MCP3422/3/4 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
(standard,
fast,
and
high
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, and less than 1 k
Ω for high speed mode
depending on the presence of bus loading capacitance.
6.1.3
I2C ADDRESS SELECTION PINS
(MCP3423 AND MCP3424)
The user can tie the Adr0 and Adr1 pins to VSS, VDD,
or left floating. See more details in Section 5.3.2
FIGURE 6-1:
Typical Connection.
Figure 6-2 shows an example of multiple device
connections.
The
I2C
bus
loading
capacitance
increases as the number of device connected to the I2C
bus line increases. The bus loading capacitance affects
on the bus operating speed. For example, the highest
bus operating speed for the 400 pF bus capacitance is
1.7 MHz, and 3.4 MHz for 100 pF. Therefore, the user
needs to consider the relationship between the
maximum operation speed versus. the number of I2C
devices that are connected to the I2C bus line.
FIGURE 6-2:
Example of Multiple Device
Connection on I2C Bus.
RP
VDD
4
5
6
9
CH2-
VSS
CH3+
Adr1
Adr0
3
12
CH2+
CH3-
2
13
CH1-
CH4+
1
14
CH1+
CH4-
7
8
SDA
SCL
VDD
11
10
C1
C2
Input
Signal 2
Signal 1
Input
Signal 4
Signal 3
TO MCU
(MASTER)
RP
I2C Address
Selection
Pins
Rp is the pull-up resistor:
5k
Ω - 10 kΩ for f
SCL
= 100 kHz to 400 kHz
~700
Ω for f
SCL
= 3.45 MHz
C1: 0.1 F, Ceramic capacitor
C2: 10 F, Tantalum capacitor
MCP3424
SDA SCL
Microcontroller
(PIC16F876)
MCP4725
MCP3422
MCP3423
MCP3424
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