DS1669S-100+ datasheet, PDF - EEWORLD Datasheet

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DS1669S-100+: DescriptionIC rheostat dallastat 100k 8soic; CategoryAnalog mixed-signal IC converter; File Size170KB，11 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html; Environmental Compliance

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DS1669S-100+ Overview

IC rheostat dallastat 100k 8soic

DS1669S-100+ Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	Maxim
Parts packaging code	SOIC
package instruction	0.208 INCH, ROHS COMPLIANT, SOIC-8
Contacts	8
Reach Compliance Code	unknown
ECCN code	EAR99
Other features	THE VOLTAGE APPLIED TO ANY TERMINAL MUST NOT EXCEED THE -V OR BY 0.5 VOLTS
Nominal bandwidth	0.1 kHz
control interface	PUSH-BUTTON
Converter type	DIGITAL POTENTIOMETER
JESD-30 code	R-PDSO-G8
JESD-609 code	e3
length	5.31 mm
Humidity sensitivity level	1
Number of functions	1
Number of positions	64
Number of terminals	8
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP8,.3
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	260
power supply	+-4.5/+-8 V
Certification status	Not Qualified
resistance law	LINEAR
Maximum resistor tolerance	20%
Maximum seat height	2.13 mm
surface mount	YES
Nominal temperature coefficient	750 ppm/°C
Temperature level	INDUSTRIAL
Terminal surface	Matte Tin (Sn)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	30
Nominal total resistance	100000 Ω
width	5.285 mm

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DS1669

Dallastat Electronic Digital Rheostat

www.maxim-ic.com

FEATURES

Replaces mechanical variable resistors

Electronic interface provided for digital as

well as manual control

Wide differential input voltage range

between 4.5 and 8V

Wiper position is maintained in the absence

of power

Low-cost alternative to mechanical controls

Applications include volume, tone, contrast,

brightness, and dimmer control

Available in 8-pin SOIC and 8-pin DIP

packages

Standard resistance values for Dallastat:

DS1669-10 ~ 10 kΩ

DS1669-50 ~ 50 kΩ

DS1669-100 ~ 100 kΩ

Operating Temperature Range

Industrial: -40°C to +85°C

PIN ASSIGNMENT DS1669

)

V-

8-Pin SOIC (208-mil)

See Mech. Drawings Section

)

-V

8-Pin DIP (300-mil)

See Mech. Drawings Section

PIN DESCRIPTION DS1669

-V, +V

- High Terminal of Potentiometer

- Wiper Terminal of Potentiometer

- Low Terminal of Potentiometer

- Voltage Inputs

- Up Contact Input

- Digital Input

- Down Contact Input

DESCRIPTION

The DS1669 Dallastat is a digital rheostat or potentiometer. This device provides 64 possible uniform tap

points over the entire resistive range. The standard resistive ranges are 10 kW, 50 kW, and 100 kW. The

Dallastat can be controlled by either a switch contact closure input or a digital source input such as a

CPU. Wiper position is maintained in the absence of power through the use of a EEPROM memory cell

array. The EEPROM cell array will withstand more than 50,000 writes.

The DS1669 is offered in two standard IC packages which include an 8-pin 300-mil DIP and an 8-pin

208-mil SOIC. The DS1669 can be configured to operate using a single pushbutton, dual pushbutton or

digital source input by varying power-on conditions. This is illustrated in Figures 1 and 2. The DS1669

pinouts allow access to both ends of the potentiometer R

, R

, and the wiper, R

. Control inputs include

1 of 10

011806

DS1669

the digital source input, D, the up contact input, UC, and the down contact input, DC. Other pins include

the positive, +V, and negative, -V, supply inputs. The DS1669 is specified to operate from -40°C to

+85°C.

OPERATION

The DS1669 can be configured to operate from a single contact closure, dual contact closure, or a digital

source input. Figures 1 and 2 illustrate both contact closure configurations. Contact closure is defined as a

transition from a high level to a low level on the up contact (UC) or down contact (DC) inputs. All three

control inputs are active when in a low state and are inactive when in a high state.

The DS1669 interprets input pulse widths as the means of controlling wiper movement. A single pulse

input on the UC, DC, or D input terminals will cause the wiper position to move 1/64

of the total

resistance. A transition from a high to low on these inputs is considered the beginning of pulse activity or

contact closure. A single pulse must be greater than 1 ms but lasting no longer than 1 second. Pulse

timings are shown in Figure 5.

Repetitive pulsed inputs can be used to step through each resistive position of the device in a relatively

fast manner (see Figure 5b). The requirement for repetitive pulsed inputs is that pulses must be separated

by a minimum time of 1 ms. If the input is not allowed to be inactive (high) for at least 1 ms, the DS1669

will interpret repetitive pulses as a single pulse.

Pulse inputs lasting longer than 1 second will cause the wiper to move one position every 100 ms

following the initial 1-second hold time. The total time to transcend the entire potentiometer using a

continuous input pulse is given by the formula below:

»1

second + 63 X 100 ms = 7.3 (seconds)

Single contact closure operation allows the user to control wiper movement in either direction from a

single pushbutton input. Figure 1 presents a typical single pushbutton configuration. The UC input is used

to increment and decrement wiper position for single pushbutton mode of operation. The DC input

provides no functionality in this mode but must be connected to the positive supply voltage (V

). The

digital source input (D) can be allowed to float.

On device power-up, the configuration shown in Figure 1 must exist in order to enter the single contact

closure mode of operation¾especially and specifically, the (DC) input’s direct connection to the positive

supply voltage (V

The initial direction of wiper movement in single pushbutton operation is determined by prior activity.

The initial direction of wiper movement will be opposite to that of the previous activity. Changing the

direction of wiper movement in single pushbutton mode is accomplished by allowing a period of

inactivity on the UC input of (greater than) 1 second, or by moving the wiper to the end of the

potentiometer range. This will occur regardless of whether the input is a continuous pulse, a sequence of

repetitive pulses or a single pulse.

The digital source input, D, was designed for microprocessor or controlled applications. This control

input manipulates the device in the same manner as the single pushbutton configuration, controlling

movement of the wiper position in both upward and downward directions. One added feature over the

single pushbutton configuration is the ability to increment or decrement wiper position at a faster rate.

Digital source input control is available regardless of the type of pushbutton configuration.

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DS1669

DS1669 DUAL PUSHBUTTON CONFIGURATION (TYPICAL APPLICATION)

Figure 2B

The DS1669 is provided with two supply inputs -V and +V. The maximum voltage difference between

the two supply inputs is +8.0 volts. The minimum voltage difference is +4.5 volts. All input levels are

referenced to the negative supply input, -V. The voltage applied to any Dallastat terminal must not exceed

the negative supply voltage (-V ) by -0.5 or the positive supply voltage (+V) by +0.5 volts. The minimum

logic high level must be +2.4 volts with reference to the -V supply voltage input for +V=5V. A logic low

level with reference to the -V supply voltage has a maximum value of +0.8 volts. Dallastats exhibit a

typical wiper resistance of 400 ohms with a maximum wiper resistance of 1000 ohms. The maximum

wiper current allowed through the Dallastat is specified at 1 milliamps (see DC Electrical

Characteristics).

NONVOLATILE WIPER SETTINGS

Dallastats maintain the position of the wiper in the absence of power. This feature is provided through the

use of EEPROM type memory cell arrays. During normal operation the position of the wiper is

determined by the input multiplexer. Periodically, the multiplexer will update the EEPROM memory

cells. The manner in which an update occurs has been optimized for reliability, durability, and

performance. Additionally, the update operation is totally transparent to the user.

When power is applied to the Dallastat, the wiper setting will be the last recorded in the EEPROM

memory cells. If the Dallastat setting is changed after power is applied, the new value will be stored after

a delay of 2 seconds. The initial storage of a new value after power-up occurs when the first change is

made, regardless of when this change is made.

After the initial change on power-up, subsequent changes in the Dallastat EEPROM memory cells will

occur only if the wiper position of the part is moved greater than 12.5% of the total resistance range. Any

wiper movement after initial power-up which is less than 12.5% will not be recorded in the EEPROM

memory cells. Since the Dallastat contains a 64-to-1 multiplexer, a change of greater than 12.5%

corresponds to a change of the fourth LSB.

Changes or storage to the EEPROM memory cells must allow for a 2-second delay to guarantee that

updates will occur. The EEPROM memory cells are specified to accept greater than 80,000 writes before

a wear-out condition. If the EEPROM memory cells do reach a wear-out condition, the Dallastat will still

function properly while power is applied. However, on power-up the device’s wiper position will be that

of the position last recorded before memory cell wear-out.

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DS1669S-100+ Related Products

	DS1669S-100+	DS1669-50+	DS1669S-10/T&R	DS1669-100+	DS1669S-10/T&R;	DS1669S-10+T&R;	DS1669S-100+T&R;	DS1669S-50+T&R;
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