MCP4142T-104ESLASHMS datasheet(28/88 Pages) MICROCHIP

28 / 88 page

MCP414X/416X/424X/426X

DS22059B-page 28

3.1

Chip Select (CS)

The CS pin is the serial interface’s chip select input.

Forcing the CS pin to VIL enables the serial commands.

Forcing the CS pin to VIHH enables the high-voltage

serial commands.

3.2

Serial Data In (SDI)

The SDI pin is the serial interfaces Serial Data In pin.

This pin is connected to the Host Controllers SDO pin.

3.3

Serial Data In / Serial Data Out

(SDI/SDO)

On the MCP41X1 devices, pin-out limitations do not

allow for individual SDI and SDO pins. On these

devices, the SDI and SDO pins are multiplexed.

The MCP41X1 serial interface knows when the pin

needs to change from being an input (SDI) to being an

output (SDO). The Host Controller’s SDO pin must be

properly protected from a drive conflict.

3.4

Ground (VSS)

The VSS pin is the device ground reference.

3.5

Potentiometer Terminal B

The terminal B pin is connected to the internal potenti-

ometer’s terminal B.

The potentiometer’s terminal B is the fixed connection

to the Zero Scale wiper value of the digital potentiome-

ter. This corresponds to a wiper value of 0x00 for both

7-bit and 8-bit devices.

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 VSS and VDD.

MCP42XX devices have two terminal B pins, one for

each resistor network.

3.6

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 VSS and VDD.

MCP42XX devices have two terminal W pins, one for

each resistor network.

3.7

Potentiometer Terminal A

The terminal A pin is available on the MCP4XX1

devices, and is connected to the internal potentiome-

ter’s terminal A.

The potentiometer’s terminal A is the fixed connection

to the Full Scale wiper value of the digital

potentiometer. This corresponds to a wiper value of

0x100 for 8-bit devices or 0x80 for 7-bit 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 VSS and VDD.

The terminal A pin is not available on the MCP4XX2

devices, and the internally terminal A signal is floating.

MCP42X1 devices have two terminal A pins, one for

each resistor network.

3.8

Write Protect (WP)

The WP pin is used to force the non-volatile memory to

be write protected.

3.9

Shutdown (SHDN)

The SHDN pin is used to force the resistor network

terminals into the hardware shutdown state.

3.10

Serial Data Out (SDO)

The SDO pin is the serial interfaces Serial Data Out pin.

This pin is connected to the Host Controllers SDI pin.

This pin allows the Host Controller to read the digital

potentiometers registers, or monitor the state of the

command error bit.

3.11

Positive Power Supply Input (VDD)

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

The input power supply is relative to VSS.

While the device VDD < Vmin (2.7V), the electrical

performance of the device may not meet the data sheet

specifications.

3.12

No Connection (NC)

Those pins should be either connected to VDD or VSS.

3.13

Exposed Pad (EP)

This pad is conductively connected to the device's

substrate. This pad should be tied to the same potential

as the VSS pin (or left unconnected). This pad could be

used to assist as a heat sink for the device when

connected to a PCB heat sink.

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