DS2890V Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated

Número de pieza

componentes Descripción

Fabricante

DS2890V

1-Wire® Digital Potentiometer

Dallas Semiconductor -> Maxim Integrated 

Figure 3. 1-WIRE POTENTIOMETER FEATURE REGISTER

DS2890

Feature Register Bit Encoding

b7 b6

b5

b4

PR

NWP

b3

b2

b1

b0

NP

WSV

PC

Feature Register Bit Definitions

Feature Description

Bit(s) Definition

PC: potentiometer characteristic

If 0: logarithmic potentiometer element(s)

b0

If 1: linear potentiometer element(s)

WSV: wiper setting volatility

If 0: wiper setting(s) are non-volatile

b1

If 1: wiper setting(s) are volatile

NP: number of potentiometers

b3..b2 2 bit binary value representing number of potentiometers:

If 00b: 1 potentiometer

If 01b: 2 potentiometers

If 10b: 3 potentiometers

If 11b: 4 potentiometers

NWP: number of wiper positions

b5..b4

2 bit binary value representing number of wiper positions

for each potentiometer:

If 00b: 32 positions

If 01b: 64 positions

If 10b: 128 positions

If 11b: 256 positions

PR: potentiometer resistance

b7..b6 2 bit binary value representing potentiometer resistance:

If 00b: 5 kΩ

If 01b: 10 kΩ

If 10b: 50 kΩ

If 11b: 100 kΩ

DS2890 feature values are highlighted: value

The DS2890 will respond with a feature register value of F3h when a READ CONTROL

REGISTER command is executed, see section “POTENTIOMETER FUNCTION COMMANDS”.

POTENTIOMETER CONTROL REGISTER

The potentiometer control register is used to turn on/off the DS2890 charge pump (see section

“POTENTIOMETER WIPER RESISTANCE AND CHARGE PUMP CONSIDERATIONS” for a

discussion of the charge pump) and has control capabilities for future 1-Wire potentiometers that could

contain multiple resistor elements. The format of the control register is shown in Figure 4.

5 of 27

Share Link: