MCP3422A1-E/MS Microchip Technology, MCP3422A1-E/MS Datasheet - Page 32

• Manufacturer Part Number: MCP3422A1-E/MS
• Description: 18-Bit, Multi-Channel Delta-Sigma ADC w/ I2C Interface and On-Board Reference ; 8L MSOP 3x3mm
• Manufacturer: Microchip Technology

MCP3422/3/4
6.1.4
The user can test the presence of the MCP3422/3/4 on
the I
version. 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
FIGURE 6-3:
DS22088B-page 32
SDA
SCL
2
a. Set the R/W bit “HIGH” in the address byte.
b. Check the ACK pulse after sending the
If the device acknowledges (ACK = 0), then the
device is connected, otherwise it is not
connected.
c. Send STOP or START bit.
C bus line without performing an input data con-
Figure
address byte.
Start
Bit
DEVICE CONNECTION TEST
6-3:
1
1
Device bits
2
1 0
3
I
2
Address Byte
C Bus Connection Test.
4
1 A2 A1 A0 1
Address bits
5
6
7
8
R/W
9
MCP342x
Response
Stop
Bit
6.1.5
Figure 6-4
ferential and single-ended inputs. Differential input sig-
nals 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
Characteristics”.
FIGURE 6-4:
Single-Ended Input Connections.
Excitation
Excitation
(b) Single-ended Input Signal Connection:
(a) Differential Input Signal Connection:
Sensor
shows typical connection examples for dif-
DIFFERENTIAL AND
SINGLE-ENDED CONFIGURATION
R
R
Sensor
1
2
Differential and
Input Signal
Input Signal
© 2008 Microchip Technology Inc.
CHn-
CHn-
CHn+
CHn+
MCP342x
MCP342x