MCP40D17 datasheet(30/66 Pages) MICROCHIP

30 / 66 page

MCP40D17/18/19

DS22152B-page 30

3.1

Positive Power Supply Input (VDD)

The VDD pin is the device’s positive power supply input.

The input power supply is relative to VSS and can range

from 1.8V to 5.5V. A de-coupling capacitor on VDD

(to VSS) is recommended to achieve maximum

performance.

While the device’s voltage is in the range of

1.8V

≤ V

DD < 2.7V, the Resistor Network’s electrical

performance of the device may not meet the data sheet

specifications.

3.2

Ground (VSS)

The VSS pin is the device ground reference.

3.3

I2C Serial Clock (SCL)

The SCL pin is the serial clock pin of the I2C interface.

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 - I2C Module” for more details of I2C

Serial Interface communication.

3.4

I2C Serial Data (SDA)

The SDA pin is the serial data pin of the I2C interface.

The SDA pin has a Schmitt trigger input and an

open-drain output. Refer to Section 5.0 “Serial

Interface - I2C Module” for more details of I2C Serial

Interface communication.

3.5

Potentiometer Terminal B

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 VSS and VDD.

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

VSS.

3.6

Potentiometer Wiper (W) Terminal

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 VSS and

VDD.

3.7

Potentiometer Terminal A

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 VSS and VDD.

The terminal A pin is not available on the MCP40D17

and MCP40D19 devices. For these devices, the

potentiometer’s terminal A is internally floating.

MCP40D17 Datasheet(PDF) 30 Page - Microchip Technology

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