
MCP3426/7/8
DS22226A-page 2
2009 Microchip Technology Inc.
The I2C address bits for the MCP3427 and MCP3428
are selected by using two external I2C address
selection pins (Adr0 and Adr1). The user can configure
the device to one of eight available addresses by
connecting these two address selection pins to VDD,
VSS or float. The I
2C address bits of the MCP3426 are
programmed at the factory during production.
The MCP3426 is available in 8-pin SOIC, DFN, and
MSOP packages. The MCP3427 is available in 10-pin
DFN, and MSOP packages. The MCP3428 is available
in 14-pin SOIC and TSSOP packages.
Package Types
MCP3426 Functional Block Diagram
4
5
6
9
CH2-
VSS
CH3+
Adr1
Adr0
3
12
CH2+
CH3-
2
13
CH1-
CH4+
1
14
CH1+
CH4-
7
8
SDA
SCL
VDD
MCP3428
11
10
SOIC, TSSOP
2
3
4
7
8
9
CH1-
VDD
SDA
Adr0
VSS
SCL
1
10
CH1+
Adr1
5
6
CH2-
CH2+
MCP342
7
2
3
4
5
6
7
CH1-
VDD
SDA
CH2+
VSS
SCL
1
8
CH1+
CH2-
MC
P
3
426
MSOP, SOIC
MSOP
MCP3426
2x3 DFN *
VDD
CH1-
SDA
CH2+
VSS
1
2
3
4
8
7
6
5 SCL
CH2-
CH1+
* Includes Exposed Thermal Pad (EP); see
Table 3-1.
EP
9
MCP3427
3x3 DFN *
VSS
CH1-
CH2+
Adr0
SCL
1
2
3
4
10
9
8
7 SDA
Adr1
CH1+
EP
11
CH2-
5
6 VDD
VSS
VDD
PGA
SCL
SDA
MU
X
I2C
Interface
Gain = 1, 2, 4, or 8
Voltage Reference
Clock
(2.048V)
VREF
ΔΣ ADC
Converter
Oscillator
MCP3426
CH1+
CH1-
CH2+
CH2-