Microchip MCP41050 Manual

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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 10 kΩ,

50 kΩ and 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

SCK

RS SHDN

PB1

PA1

PW1

Resistor

Array 1*

Wiper

PB0

PW0

PA0

Resistor

Array 0

Wiper

Control

Logic

*Potentiometer P1 is only available on the dual

MCP42XXX version.

MCP42XXX

411

PDIP/SOIC/TSSOP

PB1

PA1

PW1

SHDN

PW0

PB0

PA0

SCK

VSS

VDD

MCP41XXX

PDIP/SOIC

PB0

PA0

VDD

PW0

VSS

SCK

Single/Dual Digital Potentiometer with SPI™ Interface

MCP41XXX/42XXX

DS11195C-page 2  2003 Microchip Technology Inc.

1.0 ELECTRICAL CHARACTERISTICS

DC CHARACTERISTICS: 10 kΩ VERSION

Electrical Characteristics: Unless otherwise indicated, V DD = +2.7V to 5.5V, TA = -40°C to +85°C (TSSOP devices are only specified at +25°C and

+85°C). Typical specifications represent values for V DD = 5V, VSS = 0V, VB = 0V, TA = +25°C.

Parameters Sym Min Typ Max Units Conditions

Rheostat Mode

Nominal Resistance R 8 10 12 kΩTA = +25°C (Note 1)

Rheostat Differential Non Linearity R-DNL -1 ±1/4 +1 LSB Note 2

Rheostat Integral Non Linearity R-INL -1 ±1/4 +1 LSB Note 2

Rheostat Tempco ∆RAB/∆T — 800 — ppm/°C

Wiper Resistance RW— 52 100 ΩVDD = 5.5V, IW = 1 mA, code 00h

W— 73 125 ΩVDD = 2.7V, IW = 1 mA, code 00h

Wiper Current IW-1 — +1 mA

Nominal Resistance Match ∆R/R — 0.2 1 % MCP42010 only, P0 to P1; T A = +25°C

Potentiometer Divider

Resolution N 8 — — Bits

Monotonicity N 8 — — Bits

Differential Non-Linearity DNL -1 ±1/4 +1 LSB Note 3

Integral Non-Linearity INL -1 ±1/4 +1 LSB Note 3

Voltage Divider Tempco ∆VW/∆T — 1 — ppm/°C Code 80h

Full Scale Error VWFSE -2 -0.7 0 LSB Code FFh, V DD

= 5V, see Figure 2-25

VWFSE -2 -0.7 0 LSB Code FFh, V DD

= 3V, see Figure 2-25

Zero Scale Error VWZSE 0 +0.7 +2 LSB Code 00h, V DD = 5V, see Figure 2-25

VWZSE 0 +0.7 +2 LSB Code 00h, V DD = 3V, see Figure 2-25

Resistor Terminals

Voltage Range VA,B,W 0 — VDD Note 4

Capacitance (CA or CB) — 15 — pF f = 1 MHz, Code = 80h, see Figure 2-30

Capacitance CW— 5.6 — pF f = 1 MHz, Code = 80h, see Figure 2-30

Dynamic Characteristics (All dynamic characteristics use V DD = 5V)

Bandwidth -3dB BW — 1 — MHz VB = 0V, Measured at Code 80h,

Output Load = 30 PF

Settling Time tS— 2 — µS V

A = VDD,VB = 0V, ±1% Error Band, Transition

from Code 00h to Code 80h, Output Load = 30 pF

Resistor Noise Voltage e NWB — 9 — nV/√Hz V

A = Open, Code 80h, f =1 kHz

Crosstalk CT— -95 — dB VA = VDD, VB = 0V (Note 5)

Digital Inputs/Outputs (CS , SCK, SI, SO) See Figure 2-12 for RS and SHDN pin operation

Schmitt Trigger High-Level Input Voltage V IH 0.7VDD ——V

Schmitt Trigger Low-Level Input Voltage V IL — — 0.3VDD V

Hysteresis of Schmitt Trigger Inputs VHYS — 0.05VDD —

Low-Level Output Voltage VOL — — 0.40 V IOL = 2.1 mA, V

DD = 5V

High-Level Output Voltage V OH VDD

- 0.5 — — V IOH = -400 µA, VDD = 5V

Input Leakage Current ILI -1 — +1 µA CS = V DD, VIN = VSS or VDD, includes VA SHDN=0

Pin Capacitance (All inputs/outputs) C IN

, COUT — 10 — pF VDD = 5.0V, TA = +25°C, f c = 1 MHz

Power Requirements

Operating Voltage Range V DD 2.7 — 5.5 V

Supply Current, Active IDDA — 340 500 µA VDD = 5.5V, CS = VSS , fSCK = 10 MHz,

SO = Open, Code FFh (Note 6)

Supply Current, Static IDDS — 0.01 1 µA CS, SHDN, RS = V DD = 5.5V, SO = Open (Note 6)

Power Supply Sensitivity PSS — 0.0015 0.0035 %/% VDD = 4.5V - 5.5V, VA

= 4.5V, Code 80h

PSS — 0.0015 0.0035 %/% VDD = 2.7V - 3.3V, VA

= 2.7V, Code 80h

Note 1: VAB

= V

DD , no connection on wiper.

2: Rheostat position non-linearity R-INL is the deviation from an ideal value measured between the maximum resistance and the minimum

resistance wiper positions. R-DNL measures the relative step change from the ideal between successive tap positions. I W = 50 µA for

VDD = 3V and IW = 400 µA for VDD = 5V for 10 kΩ version. See Figure 2-26 for test circuit.

3: INL and DNL are measured at VW with the device configured in the voltage divider or potentiometer mode. V A = V

DD and VB = 0V. DNL

specification limits of ±1 LSB max are specified monotonic operating conditions. See Figure 2-25 for test circuit.

4: Resistor terminals A,B and W have no restrictions on polarity with respect to each other. Full-scale and zero-scale error were measured

using Figure 2-25.

5: Measured at VW pin where the voltage on the adjacent V W pin is swinging full-scale.

6: Supply current is independent of current through the potentiometers.

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MCP41050

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