MCP40D17 Microchip Technology Inc., MCP40D17 Datasheet - Page 30

• Manufacturer Part Number: MCP40D17
• Description: 7-bit Single I 2 C? With Command Code Digital Pot With Volatile Memory In Sc70
• Manufacturer: Microchip Technology Inc.

MCP40D17/18/19
3.1
The V
The input power supply is relative to V
from 1.8V to 5.5V. A de-coupling capacitor on V
(to V
performance.
While the device’s voltage is in the range of
1.8V ≤ V
performance of the device may not meet the data sheet
specifications.
3.2
The V
3.3
The SCL pin is the serial clock pin of the I
The MCP40D17/18/19 acts only as a slave and the
SCL pin accepts only external serial clocks. The SCL
pin is an open-drain output. Refer to Section 5.0
“Serial Interface - I
Serial Interface communication.
3.4
The SDA pin is the serial data pin of the I
The SDA pin has a Schmitt trigger input and an
open-drain output. Refer to Section 5.0 “Serial
Interface - I
Interface communication.
3.5
The terminal B pin (available on some devices) is
connected to the internal potentiometer’s terminal B.
The potentiometer’s terminal B is the fixed connection
to the Zero Scale (0x00 tap) wiper value of the digital
potentiometer.
The terminal B pin is available on the MCP40D17
device. The terminal B pin does not have a polarity
relative to the terminal W pin. The terminal B pin can
support both positive and negative current. The voltage
on terminal B must be between V
The terminal B pin is not available on the MCP40D18
and MCP40D19 devices. For these devices, the
potentiometer’s terminal B is internally connected to
V
DS22152B-page 30
SS
.
SS
DD
SS
) is recommended to achieve maximum
DD
Positive Power Supply Input (V
pin is the device’s positive power supply input.
Ground (V
pin is the device ground reference.
I
I
Potentiometer Terminal B
2
2
C Serial Clock (SCL)
C Serial Data (SDA)
< 2.7V, the Resistor Network’s electrical
2
C Module” for more details of I
2
C Module” for more details of I
SS
)
SS
and V
SS
and can range
2
2
DD
C interface.
C interface.
.
2
C Serial
DD
DD
2
C
)
3.6
The terminal W pin is connected to the internal
potentiometer’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
V
3.7
The terminal A pin (available on some devices) is
connected to the internal potentiometer’s terminal A.
The potentiometer’s terminal A is the fixed connection
to the Full Scale (0x7F tap) wiper value of the digital
potentiometer.
The terminal A pin is available on the MCP40D18
devices. The terminal A pin does not have a polarity
relative to the terminal W pin. The terminal A pin can
support both positive and negative current. The voltage
on terminal A must be between V
The terminal A pin is not available on the MCP40D17
and MCP40D19 devices. For these devices, the
potentiometer’s terminal A is internally floating.
DD
.
Potentiometer Wiper (W) Terminal
Potentiometer Terminal A
© 2009 Microchip Technology Inc.
SS
and V
DD
.
SS
and