MCP3421EV Microchip Technology, MCP3421EV Datasheet - Page 28

• Manufacturer Part Number: MCP3421EV
• Description: BOARD EVAL FOR MCP3421 SOT23-6
• Manufacturer: Microchip Technology

Specifications of MCP3421EV

• Design Resources: MCP3421EV Gerber Files
• Number Of Adc's: 1
• Number Of Bits: 18
• Sampling Rate (per Second): 4
• Data Interface: Serial
• Inputs Per Adc: 1 Single Ended
• Input Range: ±2.5 V
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Utilized Ic / Part: MCP3421
• Silicon Manufacturer: Microchip
• Application Sub Type: ADC
• Kit Application Type: Data Converter
• Silicon Core Number: MCP3421
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Not applicable / Not applicable

MCP3421
6.1.3
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:
Test.
6.1.4
Figure 6-4
differential and single-ended inputs. Differential input
signals are connected to the V
For the single-ended input, the input signal is applied to
one of the input pins (typically connected to the V
pin) while the other input pin (typically V
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 4.9 “Digital
Output Codes and Conversion to Real Values”.
DS22003E-page 28
SDA
SCL
a)
b)
If the device acknowledges (ACK = 0), then the
device is connected, otherwise it is not
connected.
c)
Figure
Start
Set the R/W bit “LOW” in the address byte.
Check the ACK pulse after sending the
Send a STOP bit.
address byte.
Bit
DEVICE COMMUNICATION TEST
DIFFERENTIAL AND SINGLE-
ENDED CONFIGURATION
shows typical connection examples for
6-3:
Device Code
ADC Section
1
1
2
1 0
3
I
Address Byte
2
C Bus Communications
4
1 A2 A1 A0 0
Address bits
5
IN
6
+ and V
7
8
MCP3421
Response
IN
R/W
- input pins.
9
IN
- pin) is
Stop
Bit
IN
+
FIGURE 6-4:
Ended Input Connections.
Sensor
Excitation
Excitation
(b) Single-ended Input Signal Connection:
(a) Differential Input Signal Connection:
C
C
1
2
: 0.1
: 10
R
R
µF
1
2
Input Signal
Sensor
µF
Input Signal
, Tantalum Capacitor
, Ceramic Capacitor
Differential and Single-
© 2009 Microchip Technology Inc.
V
V
V
V
IN
IN
IN
IN
+
-
+
-
MCP3421
MCP3421
V
V
DD
DD
C
C
1
1
C
C
2
2