Datasheet

© 2006 Microchip Technology Inc. DS21978C-page 25
MCP4011/2/3/4
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
3.1 Positive Power Supply Input (V
DD
)
The V
DD
pin is the device’s positive power supply input.
The input power supply is relative to V
SS
and can range
from 1.8V to 5.5V. A decoupling capacitor on V
DD
(to
V
SS
) is recommended to achieve maximum
performance.
3.2 Ground (V
SS
)
The V
SS
pin is the device ground reference.
3.3 Potentiometer Terminal A
The terminal A pin is connected to the internal potenti-
ometer’s terminal A (available on some devices). The
potentiometer’s terminal A is the fixed connection to the
0x3F terminal of the digital potentiometer.
The terminal A pin is available on the MCP4011,
MCP4012 and MCP4013 devices. The terminal A pin
does not have a polarity relative to the terminal W or B
pins. The terminal A pin can support both positive and
negative current. The voltage on terminal A must be
between V
SS
and V
DD
.
The terminal A pin is not available on the MCP4014.
The potentiometer’s terminal A is internally floating.
3.4 Potentiometer Wiper (W) Terminal
The terminal W pin is connected to the internal potenti-
ometer’s terminal W (the wiper). The wiper terminal is
the adjustable terminal of the digital potentiometer. The
terminal W pin does not have a polarity relative to
terminals A or B pins. The terminal W pin can support
both positive and negative current. The voltage on
terminal W must be between V
SS
and V
DD
.
3.5 Potentiometer Terminal B
The terminal B pin is connected to the internal potenti-
ometer’s terminal B (available on some devices). The
potentiometer’s terminal B is the fixed connection to the
0x00 terminal of the digital potentiometer.
The terminal B pin is available on the MCP4011 device.
The terminal B pin does not have a polarity relative to
the terminal W or A pins. The terminal B pin can
support both positive and negative current. The voltage
on terminal B must be between V
SS
and V
DD
.
The terminal B pin is not available on the MCP4012,
MCP4013 and MCP4014 devices.
For the MCP4013 and MCP4014, the internal potenti-
ometer’s terminal B is internally connected to V
SS
.
Terminal B does not have a polarity relative to
terminals W or A. Terminal B can support both positive
and negative current.
For the MCP4012, terminal B is internally floating.
Pin Number
Symbol
Pin
Type
Buffer
Type
Function
MCP4011
(SOIC-8)
MCP4012
MCP4013
(SOT-23-6)
MCP4014
(SOT-23-5)
111V
DD
P — Positive Power Supply Input
222V
SS
P — Ground
3 6 — A I/O A Potentiometer Terminal A
4 5 5 W I/O A Potentiometer Wiper Terminal
544CS
I TTL Chip Select Input
6 — — B I/O A Potentiometer Terminal B
7 — — NC — — No Connection
833U/D
I TTL Increment/Decrement Input
Legend: TTL = TTL compatible input A = Analog input
I = Input O = Output
P = Power