参数资料
型号: MCP3422A0-E/MS
厂商: Microchip Technology
文件页数: 26/58页
文件大小: 0K
描述: IC ADC 18BIT 3.75SPS 2CH 8-MSOP
产品培训模块: MCP3901 Analog Front End
标准包装: 100
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: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
供应商设备封装: 8-MSOP
包装: 管件
输入数目和类型: 4 个单端,双极;2 个差分,双极
产品目录页面: 672 (CN2011-ZH PDF)
配用: MCP3422EV-ND - BOARD EVAL MCP3422 PICKIT SERIAL
MCP3422/3/4
DS22088C-page 32
2009 Microchip Technology Inc.
6.1.4
DEVICE CONNECTION TEST
The user can test the presence of the MCP3422/3/4 on
the I2C bus line without performing an input data
conversion. This test can be achieved by checking an
acknowledge response from the MCP3422/3/4 after
sending a read or write command. Here is an example
a.
Set the R/W bit “HIGH” 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 STOP or START bit.
FIGURE 6-3:
I2C Bus Connection Test.
6.1.5
DIFFERENTIAL AND SINGLE-
ENDED CONFIGURATION
Figure 6-4 shows typical connection examples for
differential and single-ended inputs. Differential input
signals can be connected to the CHn+ and CHn- input
pins, where n = the channel number (1, 2, 3, or 4). For
the single-ended input, the input signal is applied to one
of the input pins (typically connected to the CHn+ pin)
while the other input pin (typically CHn- 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
FIGURE 6-4:
Differential and Single-
Ended Input Connections.
12
3
4
5
6
7
8
9
SCL
SDA
1
0
1A2 A1 A0 1
Start
Bit
Address Byte
Address bits
Device bits
R/W
Stop
Bit
ACK
Response
MCP342X
(a) Differential Input Signal Connection:
CHn+
CHn-
Input Signal
(b) Single-ended Input Signal Connection:
CHn+
CHn-
Input Signal
Sensor
Excitation
R1
R2
MCP342X
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