Datasheet
© 2009 Microchip Technology Inc. DS22233A-page 29
MCP434X/436X
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
Additional descriptions of the device pins follows.
TABLE 3-1: PINOUT DESCRIPTION FOR THE MCP434X/436X
Pin
Weak
Pull-up/
down
(Note 1)
Standard FunctionTSSOP QFN
Symbol I/O
Buffer
Type
14L 20L 20L
—119
P3A A Analog No
Potentiometer 3 Terminal A
1220
P3W A Analog No
Potentiometer 3 Wiper Terminal
231
P3B A Analog No
Potentiometer 3 Terminal B
342
CS
I HV w/ST “smart”
SPI Chip Select Input
453
SCK I HV w/ST “smart”
SPI Clock Input
564
SDI I HV w/ST “smart”
SPI Serial Data Input
675
V
SS
—P —
Ground
786
P1B A Analog No
Potentiometer 1 Terminal B
897
P1W A Analog No
Potentiometer 1 Wiper Terminal
—10 8
P1A A Analog No
Potentiometer 1 Terminal A
—119
P0A A Analog No
Potentiometer 0 Terminal A
91210
P0W A Analog No
Potentiometer 0 Wiper Terminal
10 13 11
P0B A Analog No
Potentiometer 0 Terminal B
—1412
WP I I “smart”
Hardware EEPROM Write Protect
—1513
RESET
I HV w/ST Yes
Hardware Reset Pin
11 16 14
SDO O O No
SPI Serial Data Output
12 17 15
V
DD
—P —
Positive Power Supply Input
13 18 16
P2B A Analog No
Potentiometer 2 Terminal B
14 19 17
P2W A Analog No
Potentiometer 2 Wiper Terminal
—2018
P2A A Analog No
Potentiometer 2 Terminal A
——21
EP — — —
Exposed Pad. (Note 2)
Legend: HV w/ST = High Voltage tolerant input (with Schmidtt trigger input)
A = Analog pins (Potentiometer terminals) I = digital input (high Z)
O = digital output I/O = Input / Output
P = Power
Note 1: The pin’s “smart” pull-up shuts off while the pin is forced low. This is done to reduce the standby and
shut-down current.
2: The QFN package has a contact on the bottom of the package. This contact is conductively connected to
the die substrate, and therefore should be unconnected or connected to the same ground as the device’s
V
SS
pin.