FIGURE 6-3: Example of Multiple Device Connection on I
參數(shù)資料
型號： MCP3421A5T-E/OT
廠商： Microchip Technology
文件頁數(shù)： 15/30頁
文件大?。?/td> 0K
描述： IC ADC 18BIT 3.75SPS SOT23-6
標(biāo)準(zhǔn)包裝： 1
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： SOT-23-6
供應(yīng)商設(shè)備封裝： SOT-23-6
包裝： 標(biāo)準(zhǔn)包裝
輸入數(shù)目和類型： 2 個(gè)單端，雙極；1 個(gè)差分，單極
配用： MCP3421EV-ND - BOARD EVAL FOR MCP3421 SOT23-6
其它名稱： MCP3421A5T-E/OTDKR
MCP3421
DS22003B-page 22
2006 Microchip Technology Inc.
FIGURE 6-3:
Example of Multiple Device
Connection on I2C Bus.
6.2
Device Connection Test
The user can test the presence of the MCP3421 on the
I2C bus line without performing an input data conver-
sion. This test can be achieved by checking an
acknowledge response from the MCP3421 after send-
ing a read or write command. Here is an example using
(a) Set the R/W bit “HIGH” in the address byte.
(b) The MCP3421 will then acknowledge by pulling
SDA bus LOW during the ACK clock and then release
the bus back to the I2C Master.
(c) A STOP or repeated START bit can then be issued
from the Master and I2C communication can continue.
FIGURE 6-4:
I2C Bus Connection Test.
6.3
Application Examples
The MCP3421 device can be used in a broad range of
sensor and data acquisition applications. Figure 6-5,
shows an example of interfacing with a bridge sensor
for pressure measurement.
FIGURE 6-5:
Example of Pressure
Measurement.
In this circuit example, the sensor full scale range is
±7.5 mV with a common mode input voltage of VDD / 2.
This configuration will provide a full 14-bit resolution
across the sensor output range. The alternative circuit
for this amount of accuracy would involve an analog
gain stage prior to a 16-bit ADC.
Figure 6-6 shows an example of temperature measure-
ment using a thermistor. This example can achieve a
linear response over a 50
°C temperature range. This
can be implemented using a standard resistor with 1%
tolerance in series with the thermistor. The value of the
resistor is selected to be equal to the thermistor value
at the mid-point of the desired temperature range.
FIGURE 6-6:
Example of Temperature
Measurement.
SDA SCL
(24LC01)
Microcontroller
EEPROM
MCP3421
(TC74)
Temperature
Sensor
(PIC16F876)
1 2 34
5 6 78
9
SCL
SDA
1 1 0
1A2 A1 A0 1
Start
Bit
Address Byte
Address bits
Device bits
R/W
Start
Bit
MCP3421
ACK
Response
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
10 k
Ω
Resistor
10 k
Ω
Thermistor
MCP3421
VIN+
VIN-
VDD
VSS
1
2
3
4
5
6
SCL
SDL
10 F
0.1 F
R
VDD
TO MCU
(MASTER)
VDD
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