MCP433X datasheet(38/88 Pages) MICROCHIP

38 / 88 page

MCP433X/435X

DS22242A-page 38

 2010 Microchip Technology Inc.

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 Clock (SCK)

The SCK pin is the serial interface's Serial Clock pin.

This pin is connected to the host controllers SCK pin.

The MCP43XX is an SPI slave device, so it’s SCK pin

is an input only pin.

3.3

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.

3.4

Ground (VSS)

The VSS pin is the device ground reference.

3.5

Potentiometer Terminal B

The terminal B pin is connected to the internal

potentiometer’s terminal B.

The potentiometer’s terminal B is the fixed connection

to the zero scale wiper value of 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.

3.6

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.

MCP43XX devices have four terminal W pins, one for

each resistor network.

3.7

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

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 MCP43X2

devices, and the internally terminal A signal is floating.

MCP43X1 devices have four terminal A pins, one for

each resistor network.

3.8

Not Connected (NC)

The NC pin is not used.

3.9

Reset (RESET)

The RESET pin is used to force the device into the

POR/BOR 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 devices VDD is less than Vmin (2.7V), the

electrical performance of the device may not meet the

data sheet specifications.

3.12

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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