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| 型号： | MCP3421A1T-E/CH |
| 厂商： | Microchip Technology |
| 文件页数： | 21/42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： | MCP3421A1T-E/CHDKR |
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MCP3421
DS22003E-page 28
2009 Microchip Technology Inc.
6.1.3
DEVICE COMMUNICATION TEST
The user can test the communication between the
Master (MCU) and the MCP3421 by simply checking
an acknowledge response from the MCP3421 after
sending a read or write command. Here is an example
using Figure 6-3:
a)
Set the R/W bit “LOW” in the address byte.
b)
Check the ACK pulse after sending the
address byte.
If the device acknowledges (ACK = 0), then the
device
is
connected,
otherwise
it
is
not
connected.
c)
Send a STOP bit.
FIGURE 6-3:
I2C Bus Communications
Test.
6.1.4
DIFFERENTIAL AND SINGLE-
ENDED CONFIGURATION
Figure 6-4 shows typical connection examples for
differential and single-ended inputs. Differential input
signals are connected to the VIN+ and VIN- input pins.
For the single-ended input, the input signal is applied to
one of the input pins (typically connected to the VIN+
pin) while the other input pin (typically VIN- pin) is
grounded. All device characteristics hold for the single-
ended configuration, but this configuration loses one bit
resolution because the input can only stand in
positive half scale. Refer to
FIGURE 6-4:
Differential and Single-
Ended Input Connections.
1
2
34
5
6
78
9
SCL
SDA
11
0
1A2 A1 A0 0
Start
Bit
Address Byte
Address bits
ADC Section
R/W
Stop
Bit
AC
K
Response
Device Code
MCP3421
(a) Differential Input Signal Connection:
Input Signal
(b) Single-ended Input Signal Connection:
Input Signal
Sensor
Excitation
R1
R2
VIN+
VIN-
VDD
VIN+
VIN-
VDD
C1
C2
C1
C2
C1 : 0.1 F, Ceramic Capacitor
C2 : 10 F, Tantalum Capacitor
MCP3421
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