DS1806S-010+ datasheet, PDF - EEWORLD Datasheet

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DS1806S-010+: Descriptiondigital potentiometer ics digital sextet; Categorysemiconductor Other integrated circuit (IC); File Size281KB，8 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html; Environmental Compliance

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DS1806S-010+ Overview

digital potentiometer ics digital sextet

DS1806S-010+ Parametric

Parameter Name	Attribute value
Manufacture	Maxim Integrated
Product Category	Digital Potentiometer ICs
RoHS	Yes
Resistance	10 kOhms
Number of POTs	Hextuple
Taps per POT	64
Wiper Memory	Volatile
Digital Interface	Serial (3-Wire)
Operating Supply Voltage	3 V, 5 V
Supply Curre	2 mA
Maximum Operating Temperature	+ 85 C
Mounting Style	SMD/SMT
Package / Case	SOIC-20 Wide
Packaging	Tube
Minimum Operating Temperature	- 40 C
Factory Pack Quantity	37
Supply Voltage - Max	5.5 V
Supply Voltage - Mi	2.7 V

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DS1806

Digital Sextet Potentiometer

www.dalsemi.com

FEATURES

Six digitally controlled 64-position

potentiometers

3-wire serial port provides for reading and

setting each potentiometer

Devices can be cascaded for single processor

multi-device control

Standard resistance values:

- DS1806-010

10 kΩ

- DS1806-050

50 kΩ

- DS1806-100

100 kΩ

Operating Temperature Range:

- Industrial temperature: -40° to +85°

PIN ASSIGNMENT

L1-3

L4-6

RST

CLK

GND

OUT

PIN DESCIPTION

RST

CLK

OUT

H1 - H6

W1 - W6

GND

L1-3

L4-6

3V or 5V Supply

Serial Port Reset Input

Serial Port Data Input

Serial Port Clock Input

Cascade Data Output

High End terminal of Pot

Wiper Terminal of Pot

Ground

Low Terminal Pots 1 through 3

Low Terminal Pots 4 through 6

DS1806 20-Pin DIP (300-mil)

DS1806S 20-Pin SOIC (300-mil)

DS1806E 20-Pin TSSOP (173-mil)

See Mech. Drawings Section

DESCRIPTION

The DS1806 Digital Sextet Potentiometer is a six-channel, digitally controlled, solid-state linear

potentiometer. Each potentiometer is comprised of 63 equiresistive sections as illustrated in the block

diagram of Figure 1. Each potentiometer has three terminals accessible to the user. These include the high

side terminals, H

, the wiper terminals, W

, and the low-end terminals, L1-3 and L4-6. Potentiometers 1

through 3 share the same low-end terminal L1-3; likewise, potentiometers 4 through 6 share the low-end

terminal L4-6.

Each wiper’ position is selected via an 8-bit register value. Communication and control of the device is

accomplished via a 3-wire serial port interface. This interface in conjunction with a cascade output allows

the value of the device wiper settings to be read.

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DS1806

For multiple device and single processor environments, the DS1806 can be cascaded or daisy-chained.

This feature allows a single processor to control multiple devices.

The DS1806 is available in 10, 50 and 100-kohm versions and is specified over the industrial temperature

range. Packages for the device include 20-lead DIPs, SOICs, and TSSOPs.

OPERATION

A block diagram of the device is provided in Figure 1. As shown, the DS1806 contains six 64-position

potentiometers whose wiper positions are set by an 8-bit value. The DS1806 contains a 48-bit I/O shift

Each potentiometer has three terminals accessible to the user. These include the high side terminals, H

the wiper terminals, W

, and the low-end terminals, L1-3 and L4-6. Potentiometers 1 through 3 share the

same low-end terminal L1-3. And likewise, potentiometers 4 through 6 share the low-end terminal L4-6.

Control of the DS1806 is accomplished via a 3-wire serial communication interface which allows the user

to set the wiper position value for each potentiometer. The 3-wire serial interface consists of the control

signals

RST

, D

, and CLK. On power-up, the wiper positions of each potentiometer are set to the low-

end terminal L

(00000000).

The

RST

control signal is used to enable 3-wire serial port operation. The

RST

signal (3-wire serial port)

is active when in a high state. Any communication intended to change wiper settings must begin with the

transition of the

RST

from the low state to the high state.

The CLK signal input is used to provide timing synchronization for data input and output. Wiper position

data is loaded into the DS1806 through the D

input terminal. This data is shifted one bit at a time into

the 48-bit I/O shift register of the part, LSB first. Figure 3 provides an illustration of the 48-bit shift

Figure 4 provides 3-wire serial port protocol and timing diagrams. As shown, the 3-wire port is inactive

when the

RST

signal input is low. Once

RST

has transitioned from the low to the high state, the serial

port becomes active. When active, data is loaded into the I/O shift register on the low-to-high transition of

the CLK.

Data is transmitted in order of LSB first. Potentiometers are designated from 1 through 6 and the value

for potentiometer-1 will be the first data entered into the shift register, followed by that of potentiometer-

2 and so forth.

Each wiper has an 8-bit register which is used for setting the position of the wiper on the resistor array.

Because the DS1806 is a 64-position potentiometer, only six bits of information are needed to set wiper

position. The remaining two bits of information are used to provide a “don’ change” feature. Wiper

position is controlled by bit positions 0 through 5 of each register. The “don’ change” feature is

controlled by bits 6 and 7 of each register. When bits 6 and 7 have value “11 xxxxxx,” wiper position will

not change regardless of the states of bits 0 through 5. If bits 6 and 7 are set to any other value, bits 0

through 5 will be used as the new wiper position. The “don’ change” feature allows the user to change

the value of any potentiometer of the DS1806 without affecting or having to remember the remaining

positions of the potentiometer wipers. Figure 2 provides the format for a wiper’ register.

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DS1806

3-WIRE SERIAL PORT TIMING

Figure 4

CASCADE OPERATION

A feature of the DS1806 is the ability to control multiple devices from a single processor. Multiple

DS1806s can be linked or daisy chained as shown in Figure 5. As a data bit is entered into the I/O shift

OUT

terminal before a maximum delay of 50 nanoseconds.

The LSB of potentiometer-1 will always be the first out of the part at the beginning of a transaction.

Additionally, the C

OUT

terminal is always active regardless of the state

RST

. However, D

and CLK

inputs are ignored when

RST

is in the low state.

The C

OUT

output of the DS1806 can be used to drive the D

input of another DS1806. When cascading

multiple devices, the total number of bits transmitted is always 48 multiplied by the total number of

DS1806s being cascaded.

An optional feedback resistor can be placed between the C

OUT

terminal of the last device and the first

DS1806 D

input, which allows the controlling processor to read as well as write data or circularly clock

data through the daisy chain. The value of the feedback or isolation resistor should be in the range from 1

kΩ to 10 kΩ .

To read data, the reading device configures itself as an input and monitors the state of the D

line, which

is driven by C

OUT

through the isolation resistor. When

RST

is driven high, bit 48 is present on the C

OUT

pin, which is fed back to the input D

pin through the isolation resistor. When the CLK input transitions

low to high, bit 48 is loaded into the first position of the I/O shift register and bit 47 becomes present on

OUT

and D

of the next device. After 48 bits (or 48 times the number of the DS1806s in the daisy

chain), the data has shifted completely around and back to its original position. When

RST

transitions to

the low state to end data transfer, the value (the same as before the read occurred) is loaded in the shift

ABSOLUTE AND RELATIVE LINEARITY

Absolute linearity is defined as the difference between the actual measured output voltage and the

expected output voltage. Absolute linearity is given in terms of a minimum increment or expected output

when the wiper is moved one position. The DS1806 is specified to have an absolute linearity of

±0.50

LSB.

Relative linearity is a measure of error between two adjacent wiper position points. The DS1806 is

specified to have a relative linearity of

±0.25

LSB.

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102199

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