MCP3421 datasheet(28/42 Pages) MICROCHIP

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MCP3421

DS22003E-page 28

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:

Set the R/W bit “LOW” in the address byte.

Check the ACK pulse after sending the

address byte.

If the device acknowledges (ACK = 0), then the

device

connected,

otherwise

not

connected.

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

Section 4.9 “Digital

Output Codes and Conversion to Real Values”.

FIGURE 6-4:

Differential and Single-

Ended Input Connections.

SCL

SDA

1A2 A1 A0 0

Start

Bit

Address Byte

Address bits

ADC Section

R/W

Stop

Bit

Response

Device Code

MCP3421

(a) Differential Input Signal Connection:

Input Signal

(b) Single-ended Input Signal Connection:

Input Signal

Sensor

Excitation

VIN+

VIN-

VDD

VIN+

VIN-

VDD

C1 : 0.1 µF, Ceramic Capacitor

C2 : 10 µF, Tantalum Capacitor

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