MCP4341503ESLASHML datasheet(30/80 Pages) MICROCHIP

30 / 80 page

MCP434X/436X

DS22233A-page 30

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

Ground (VSS)

The VSS pin is the device ground reference.

3.4

Potentiometer Terminal B

The terminal B pin is connected to the internal

potentiometer’s terminal B.

The potentiometer’s terminal B is the fixed connection

the

Zero

Scale

wiper

value

the

digital

potentiometer. 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.

MCP43XX devices have four terminal B pins, one for

each resistor network.

3.5

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.

MCP43XX devices have four terminal W pins, one for

each resistor network.

3.6

Potentiometer Terminal A

The terminal A pin is available on the MCP43X1

devices,

and

connected

the

internal

potentiometer’s terminal A.

The potentiometer’s terminal A is the fixed connection

the

Full

Scale

wiper

value

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 MCP43X2

devices, and the internally terminal A signal is floating.

MCP43X1 devices have four terminal A pins, one for

each resistor network.

3.7

Write Protect (WP)

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

be write protected.

3.8

Reset (RESET)

The RESET pin is used to force the device into the

POR/BOR state.

3.9

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.

3.10

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.

3.11

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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