MCP434X Datasheet, PDF (29/80 Pages) Microchip Technology – 7/8-Bit Quad SPI Digital POT with Non-Volatile Memory

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
TSSOP
14L 20L
QFN
20L
Pin
Symbol
Weak
Pull-up/
I/O
Buffer _down
Type _{(Note 1)}
Standard Function
—
1
19
P3A
A Analog
No _{Potentiometer 3 Terminal A}
1
2
20
P3W
A Analog
No _{Potentiometer 3 Wiper Terminal}
2
3
1
P3B
A Analog
No _{Potentiometer 3 Terminal B}
3
4
2
CS
I HV w/ST “smart” _{SPI Chip Select Input}
4
5
3
SCK
I HV w/ST “smart” _{SPI Clock Input}
5
6
4
SDI
I HV w/ST “smart” _{SPI Serial Data Input}
6
7
5
V_SS
—
P
— _Ground
7
8
6
P1B
A Analog
No _{Potentiometer 1 Terminal B}
8
9
7
P1W
A Analog
No _{Potentiometer 1 Wiper Terminal}
— 10
8
P1A
A Analog
No _{Potentiometer 1 Terminal A}
—
11
9
P0A
A Analog
No _{Potentiometer 0 Terminal A}
9
12 10
P0W
A Analog
No _{Potentiometer 0 Wiper Terminal}
10 13 11
P0B
A Analog
No _{Potentiometer 0 Terminal B}
— 14 12
WP
I
I
“smart” _{Hardware EEPROM Write Protect}
— 15 13
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}
— 20 18
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:
2:
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.
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.
© 2009 Microchip Technology Inc.
DS22233A-page 29