MCP3422EV Microchip Technology, MCP3422EV Datasheet - Page 32
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MCP3422EV
Manufacturer Part Number
MCP3422EV
Description
BOARD EVAL MCP3422 PICKIT SERIAL
Manufacturer
Microchip Technology
Series
PICkit™r
Specifications of MCP3422EV
Number Of Adc's
2
Number Of Bits
18
Sampling Rate (per Second)
3.75
Data Interface
Serial
Inputs Per Adc
1 Differential
Input Range
±2.048 V
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 125°C
Utilized Ic / Part
MCP3422
Silicon Manufacturer
Microchip
Application Sub Type
ADC
Kit Application Type
Data Converter
Silicon Core Number
MCP3422
Kit Contents
Board, Software
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
MCP3422/3/4
6.1.4
The user can test the presence of the MCP3422/3/4 on
the I
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
using
a.
b.
c.
FIGURE 6-3:
DS22088C-page 32
SDA
SCL
Set the R/W bit “HIGH” in the address byte.
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.
Send STOP or START bit.
2
Figure
C bus line without performing an input data
Start
Bit
DEVICE CONNECTION TEST
6-3:
1
1
Device bits
2
1 0
3
Address Byte
I
2
4
1 A2 A1 A0 1
C Bus Connection Test.
Address bits
5
6
7
8
R/W
MCP342X
9
Response
Stop
Bit
6.1.5
Figure 6-4
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
half scale. Refer to Section 1.0 “Electrical Character-
istics”.
FIGURE 6-4:
Ended Input Connections.
Excitation
Excitation
(b) Single-ended Input Signal Connection:
(a) Differential Input Signal Connection:
Sensor
DIFFERENTIAL AND SINGLE-
ENDED CONFIGURATION
shows typical connection examples for
R
R
Sensor
1
2
Differential and Single-
Input Signal
Input Signal
© 2009 Microchip Technology Inc.
CHn-
CHn-
CHn+
CHn+
MCP342X
MCP342X