DS1809U-100- datasheet, PDF - EEWORLD Datasheet

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DS1809U-100-: DescriptionDigital Potentiometer ICs Dallastat; Categorysemiconductor Other integrated circuit (IC); File Size128KB，10 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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Digital Potentiometer ICs Dallastat

DS1809U-100- Parametric

Parameter Name	Attribute value
Product Attribute	Attribute Value
Manufacturer	Maxim
Product Category	Digital Potentiometer ICs
RoHS	Details
Resistance	100 kOhms
Temperature Coefficient	750 PPM / C
Tolerance	20 %
Number of POTs	Dual
Taps per POT	64
Wiper Memory	Non Volatile
Operating Supply Voltage	4.5 V, 5.5 V
Operating Supply Current	1000 uA
Maximum Operating Temperature	+ 85 C
Mounting Style	SMD/SMT
Package / Case	uSOP-8
Taper	Linear
Packaging	Tube
Description/Function	Dallastat
Factory Pack Quantity	50
Supply Voltage - Max	5.5 V
Supply Voltage - Min	4.5 V

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DS1809

Dallastat

FEATURES



64-Position Linear Taper

Two Nonvolatile Wiper Storage Options

Operates from +4.5V to +5.5V Supplies

Operating Temperature Range:

- Industrial: -40°C to +85°C

Electronic Interface Provides Either Digital

or Pushbutton Control

Low-Cost Alternative to Mechanical

Solutions

Standard Resistance Values

- DS1809-010

10kΩ

- DS1809-050

50kΩ

- DS1809-100

100kΩ

PIN ASSIGNMENT

STR

GND

PDIP (300 mils)

SO (150 mils)

μSOP (118 mils)

PIN DESCRIPTION

STR

GND

Supply Voltage

High End of Resistor

Low End of Resistor

Wiper Terminal

Up Control Input

Down Control Input

Storage Enable Input

Ground

DESCRIPTION

The DS1809 Dallastat is a nonvolatile digitally controlled potentiometer that provides 64 uniform wiper

positions over the entire resistor range; including the high-end and low-end terminals of the device. The

DS1809 is a low-power device capable of operating from power supplies of +4.5V to +5.5V. The device

is ideal for low-power, portable, or battery powered applications.

Wiper position is maintained in the absence of power. This is accomplished via the use of an EEPROM

cell array. The device provides for two storage methods, which include an autostore capability and a

command-initiated storage function. The EEPROM cell array is specified to accept greater than 50k

writes. Storage of the wiper position is discussed in the

Wiper Storage

section of this data sheet.

Wiper positioning is controlled via a dual pushbutton (or contact closure) interface. For simple

pushbutton-controlled applications or CPU-generated control signals, external debounce circuitry is not

needed. The control interface will support both repetitive pulse inputs and continuous pulse (“push-and-

hold”) inputs. Repetitive pulse and continuous pulse control as well as timing diagrams are discussed in

the

Operation.

The DS1809 is available in standard 10 kΩ, 50 kΩ, and 100 kΩ resistor versions. The DS1809 is

provided as an industrial temperature grade part only. Available packaging for the DS1809 include an 8-

lead (300-mil) PDIP, an 8-lead (150-mil) SO, and an 8-lead (118-mil)

µSOP.

1 of 10

19-7387; Rev 4/14

DS1809

BLOCK DIAGRAM

Figure 1

OPERATION

The DS1809 Dallastat is a digitally controlled, nonvolatile potentiometer. A block diagram of the

DS1809 is shown in Figure 1. The DS1809 is a linear potentiometer providing 64-uniform wiper

positions over the entire resistor range including the end-terminals. All three potentiometer terminals of

the device are accessible. These terminals include R

, R

, and R

. R

and R

are the end-terminals of the

potentiometer. These terminals will have a constant resistance between them as defined by the

potentiometer value chosen: 10kΩ, 50kΩ, or the 100kΩ version. Functionally, R

and R

are

interchangeable. The wiper terminal, R

, is the multiplexed terminal and can be set to one of the 64 total

positions that exist on the resistor ladder including the R

and R

terminals.

Control of the wiper (R

) position setting is accomplished via the two inputs UC and DC. The UC and

DC control inputs, when active, determine the direction on the resistor array that the wiper position will

move. The UC (up control) control input is used to move the wiper position towards the R

terminal. The

DC (down control) control input is used to move wiper position towards the R

terminal.

The control inputs UC and DC are active low inputs that interpret input pulse widths as the means of

controlling wiper movement. Internally, these inputs are pulled up to V

via a 100kΩ resistance. A

transition from a high-to-low on these inputs is considered the beginning of pulse input activity.

A single pulse on the UC or DC input is defined as being greater than 1 millisecond but lasting no longer

that ½ second. This type pulse input will cause the wiper position of the Dallastat to move one position.

Multiple pulse inputs (repetitive pulse inputs) can be used to step through each wiper position of the

device. The requirement for a repetitive pulse train on the UC or DC inputs is that pulses must be

separated by a minimum high time of 1ms. If this is not the case the Dallastat will ignore that pulse input.

A continuous pulse input (“push and hold”) is defined as lasting longer that one-half second. A

continuous pulse input will cause the wiper position to move one position every 100 milliseconds

following the initial one-half-second hold time. The total time to transcend the entire potentiometer given

a continuous pulse input is provided by the equation:

2 of 10

DS1809

1/2(second) + 62 x 100ms = 6.7 (seconds)

If the wiper position of the DS1809 is incremented to an end-position, it will stay at that position until the

device receives an opposite direction input pulse command over the UC or DC inputs. For example, if the

wiper position is incremented to the R

terminal using the UC input control, it will stay at that position

until UC is first deactivated, and then the DC input is activated to move the wiper position towards the R

terminal.

The UC and DC control inputs are designed to support simple pushbutton inputs or CPU generated

inputs. Figure 2 illustrates the requirements for pushbutton generated controls. For manual pushbutton

controls, all that is required are the desired pushbuttons to implement contact closure. No external

debounce or timing circuitry is needed to support the pushbutton operation.

Applications using CPU generated controls must power the UC and DC control pins in a high state to

avoid any inadvertent wiper position movement. To help prevent inadvertent wiper position movement

during a power-up, the DS1809 locks out the control port inputs for a minimum time of 10 ms.

WIPER STORAGE

As stated earlier, the DS1809 provides for two methods of nonvolatile wiper storage using internal

EEPROM memory cells. These two methods include an autostore configuration and a command initiated

storage operation, both of which utilize the STR input pin. The EEPROM cell array of the DS1809 is

designed to accept greater than 50k writes.

AUTOSTORAGE

The autostore configuration is designed to provide wiper position storage as the part powers down;

writing the current wiper position into memory. The configuration for initiating the automatic storage

capability of the DS1809 is shown in Figure 3. As shown in this configuration, two external devices are

required to insure proper wiper storage. This includes a Schottky diode and a 10-uf capacitor. The

automatic store configuration will cause the DS1809 to initiate storage of wiper position when power

) to the device is removed. The 10-uF capacitor and Schottky diode are used to provide supplemental

power for wiper storage.

COMMAND-INITIATED WIPER STORAGE

The DS1809 will also support a command-initiated wiper storage operation during powered conditions.

For command initiated storage the STR pin should be held in a low state on power-up; otherwise the part

will assume an autostore configuration. As shown in Figure 5, a low-to-high pulse lasting at least 1

µs

the STR input will cause the DS1809 to initiate the storage of the current wiper position into EEPROM

when V

is present.

3 of 10

DS1809U-100- Related Products

	DS1809U-100-	DS1809-100	DS1809U-010-TR	CC5-42701ABSANKTS	CC8-2230BDCSSNHWS	CH0402-196RFNPB	CMF1206370OHMS0.05%10PPMTAPE	DS1809-010+	CSC12A05271271JPO3
Description	Digital Potentiometer ICs Dallastat	Digital Potentiometer ICs Dallastat	Digital Potentiometer ICs Dallastat	Fixed Resistor, Thin Film, 0.4W, 42700ohm, 200V, 0.05% +/-Tol, -10,10ppm/Cel, 1010,	Fixed Resistor, Thin Film, 0.035W, 22.3ohm, 100V, 0.5% +/-Tol, -50,50ppm/Cel, 0202,	Fixed Resistor, Thin Film, 0.05W, 196ohm, 37V, 1% +/-Tol, 100ppm/Cel, Surface Mount, 0402, CHIP	Fixed Resistor, Thin Film, 0.25W, 370ohm, 300V, 0.05% +/-Tol, -10,10ppm/Cel, 1202,	Digital Potentiometer ICs Dallastat	Array/Network Resistor, Dual Terminator, Metal Glaze/thick Film, 0.2W, 270ohm, 100V, 5% +/-Tol, -100,100ppm/Cel,
Temperature Coefficient	750 PPM / C	-	-	10 ppm/°C	50 ppm/°C	100 ppm/°C	10 ppm/°C	-	100 ppm/°C
Tolerance	20 %	-	-	0.05%	0.5%	1%	0.05%	-	5%
Is it Rohs certified?	-	incompatible	-	conform to	-	conform to	conform to	conform to	incompatible
Reach Compliance Code	-	not_compliant	-	compliant	unknown	compliant	compliant	compliant	compliant
ECCN code	-	EAR99	-	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Number of terminals	-	8	-	2	2	2	2	8	12
Maximum operating temperature	-	85 °C	-	125 °C	125 °C	155 °C	125 °C	85 °C	125 °C
Minimum operating temperature	-	-40 °C	-	-55 °C	-55 °C	-55 °C	-55 °C	-40 °C	-55 °C
Package form	-	IN-LINE	-	SMT	SMT	SMT	SMT	IN-LINE	SIP
Terminal surface	-	Tin/Lead (Sn/Pb)	-	Aluminum (Al)	-	Tin/Silver (Sn/Ag) - with Nickel (Ni) barrier	-	Matte Tin (Sn)	Tin/Lead (Sn/Pb)
Objectid	-	-	-	279747340	991994425	230388530	849046230	-	700394679
YTEOL	-	-	-	8.25	8.5	8.25	10	-	7.25
structure	-	-	-	Chip	Chip	Rectangular	Rectangular	-	Conformal Coating
Package height	-	-	-	0.254 mm	0.25 mm	0.5 mm	1.6 mm	-	4.95 mm
Package length	-	-	-	2.54 mm	0.5 mm	1 mm	3.2 mm	-	30.23 mm
Package width	-	-	-	2.54 mm	0.5 mm	0.6 mm	0.55 mm	-	2.49 mm
method of packing	-	-	-	TR	Waffle Pack	TR, PAPER	Tape	-	Bulk
Rated power dissipation(P)	-	-	-	0.4 W	0.035 W	0.05 W	0.25 W	-	0.2 W
resistance	-	-	-	42700 Ω	22.3 Ω	196 Ω	370 Ω	-	270 Ω
Resistor type	-	-	-	FIXED RESISTOR	FIXED RESISTOR	FIXED RESISTOR	FIXED RESISTOR	-	ARRAY/NETWORK RESISTOR
technology	-	-	-	THIN FILM	THIN FILM	THIN FILM	THIN FILM	-	METAL GLAZE/THICK FILM
Operating Voltage	-	-	-	200 V	100 V	37 V	300 V	-	100 V

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