Microchip MCP41050 Handleiding

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 2003 Microchip Technology Inc.DS11195C-page 1

MMCP41XXX/42XXX

Features

•256 taps for each potentiometer

•Potentiometer values for 10 kΩ, 50 kΩ and

100 kΩ

•Single and dual versions

•SPI™ serial interface (mode 0,0 and 1,1)

• ±1 LSB max INL & DNL

•Low power CMOS technology

•1 µA maximum supply current in static operation

•Multiple devices can be daisy-chained together

(MCP42XXX only)

•Shutdown feature open circuits of all resistors for

maximum power savings

•Hardware shutdown pin available on MCP42XXX

only

•Single supply operation (2.7V - 5.5V)

•Industrial temperature range: -40°C to +85°C

•Extended temperature range: -40°C to +125°C

Block Diagram

Description

The MCP41XXX and MCP42XXX devices are 256-

position, digital potentiometers available in 10kΩ,

50 kΩand 100 kΩ resistance versions. The

MCP41XXX is a single-channel device and is offered in

an 8-pin PDIP or SOIC package. The MCP42XXX con-

tains two independent channels in a 14-pin PDIP, SOIC

or TSSOP package. The wiper position of the

MCP41XXX/42XXX varies linearly and is controlled via

an industry-standard SPI interface. The devices con-

sume <1 µA during static operation. A software shut-

down feature is provided that disconnects the “A”

terminal from the resistor stack and simultaneously con-

nects the wiper to the “B” terminal. In addition, the dual

MCP42XXX has a SHDN pin that performs the same

function in hardware. During shutdown mode, the con-

tents of the wiper register can be changed and the

potentiometer returns from shutdown to the new value.

The wiper is reset to the mid-scale position (80h) upon

power-up. The RS (reset) pin implements a hardware

reset and also returns the wiper to mid-scale. The

MCP42XXX SPI interface includes both the SI and SO

pins, allowing daisy-chaining of multiple devices. Chan-

nel-to-channel resistance matching on the MCP42XXX

varies by less than 1%. These devices operate from a

single 2.7 - 5.5V supply and are specified over the

extended and industrial temperature ranges.

Package Types

16-Bit

Shift

VDD

VSS

SI

SCK

RS SHDN

PB1

PA1

PW1

Resistor

Array 1*

Wiper

Register

PB0

PW0

PA0

Resistor

Array 0

Wiper

Register

Register

S0

Control

Logic

CS

*Potentiometer P1 is only available on the dual

MCP42XXX version.

MCP42XXX

1

2

3

411

12

13

14

8

9

10

5

6

7

PDIP/SOIC/TSSOP

PB1

PA1

PW1

SHDN

SO

RS

PW0

PB0

CS

PA0

SCK

SI

VSS

VDD

MCP41XXX

1

2

3

45

6

7

8

PDIP/SOIC

PB0

PA0

VDD

PW0

VSS

CS

SCK

SI

Single/Dual Digital Potentiometer with SPI™ Interface

Product specificaties