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dallas-ds1267-100-dual-digital-potentiometer

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Important Note

This entire repo was AI created - including all of the data within. The intent was to A) help me with my personal electronics inventory; and B) see how I could use AI to make that process a bit easier. DO NOT TRUST!

Dallas DS1267-100 Dual Digital Potentiometer

Details

  • Location: Cabinet-3, Bin 33, Section D
  • Category: Digital Potentiometer
  • Quantity: 1
  • Status: Available
  • Package: 14-pin DIP (Dual In-line Package)
  • Datasheet: DS1267 Datasheet

Description

The DS1267-100 is a dual digital potentiometer from Dallas Semiconductor featuring two independent 100kΩ potentiometers with 256 wiper positions each. Communication and control is accomplished via a 3-wire serial port interface, making it ideal for microcontroller-based applications requiring precise resistance control.

Key Features

  • Dual Independent Potentiometers: Two separate 100kΩ potentiometers
  • 256 Wiper Positions: 8-bit resolution for fine control
  • 3-Wire Serial Interface: Simple SPI-compatible communication
  • Non-Volatile Memory: Wiper positions stored in EEPROM
  • Wide Supply Range: +4.5V to +5.5V operation
  • Low Power: Minimal current consumption
  • Temperature Stable: Reliable operation across temperature range
  • End-to-End Resistance: 100kΩ ±20% tolerance

Technical Specifications

  • Package: 14-pin DIP (0.3” width)
  • Technology: CMOS with EEPROM
  • Resistance Value: 100kΩ (±20%)
  • Resolution: 8-bit (256 positions)
  • Wiper Resistance: Typically 300Ω
  • Supply Voltage: +4.5V to +5.5V
  • Supply Current: 3mA maximum (active), 100μA (standby)
  • Operating Temperature: -40°C to +85°C
  • Interface: 3-wire serial (SPI compatible)

Typical Pinout (DIP-14)

    DS1267-100
    ┌─────────────┐
VCC │1          14│ GND
CLK │2          13│ DQ
RST │3          12│ POT1_H
POT0_H│4        11│ POT1_W
POT0_W│5        10│ POT1_L
POT0_L│6         9│ NC
NC  │7           8│ NC
    └─────────────┘

Pin Descriptions

  • VCC (Pin 1): Power supply (+4.5V to +5.5V)
  • CLK (Pin 2): Serial clock input
  • RST (Pin 3): Reset input (active low)
  • POT0_H (Pin 4): Potentiometer 0 high terminal
  • POT0_W (Pin 5): Potentiometer 0 wiper
  • POT0_L (Pin 6): Potentiometer 0 low terminal
  • NC (Pins 7, 8, 9): No connection
  • POT1_L (Pin 10): Potentiometer 1 low terminal
  • POT1_W (Pin 11): Potentiometer 1 wiper
  • POT1_H (Pin 12): Potentiometer 1 high terminal
  • DQ (Pin 13): Serial data input/output
  • GND (Pin 14): Ground

Serial Interface

Communication Protocol

  • 3-Wire Interface: Clock (CLK), Data (DQ), Reset (RST)
  • Data Format: 8-bit commands and data
  • Clock Rate: Up to 5MHz
  • Bidirectional Data: Single DQ line for input/output

Command Structure

  • Write Potentiometer: Set wiper position (0-255)
  • Read Potentiometer: Read current wiper position
  • Write Control Register: Configure device operation
  • Read Control Register: Read device status

Applications

  • Audio Volume Control: Stereo volume and balance adjustment
  • Bias Voltage Control: Setting reference voltages in circuits
  • Gain Control: Adjustable amplifier gain stages
  • Filter Tuning: Active filter frequency adjustment
  • Calibration: Precision trimming of analog circuits
  • LCD Contrast Control: Display contrast adjustment
  • Motor Speed Control: PWM duty cycle adjustment
  • Sensor Calibration: Offset and span adjustment

Circuit Examples

Basic Volume Control

  • Connect POT0_H to signal input, POT0_L to ground
  • POT0_W provides variable output for volume control
  • Use POT1 for balance control in stereo applications

Voltage Divider

  • Connect POT_H to positive reference, POT_L to ground
  • POT_W provides programmable voltage output
  • Resolution: Vref × (wiper_position / 255)

Advantages

  • Digital Control: Precise, repeatable settings
  • Non-Volatile: Settings retained without power
  • Dual Channel: Two independent potentiometers
  • Microcontroller Friendly: Simple serial interface
  • No Mechanical Wear: Solid-state operation
  • Remote Control: Can be located away from control circuit

Programming Notes

  • Wiper Position: 0 = minimum resistance, 255 = maximum resistance
  • Power-On State: Wiper positions restored from EEPROM
  • Write Cycles: EEPROM rated for 50,000 write cycles
  • Interface Timing: Observe setup and hold times for reliable operation

Tags

digital-potentiometer, dual-channel, 100k-ohm, serial-interface, dallas, dip-14, vintage cabinet-3 bin-33 section-d status-available

Notes

This is a vintage digital potentiometer from Dallas Semiconductor (now part of Maxim Integrated/Analog Devices). While discontinued, it remains useful for:

  • Vintage audio equipment restoration
  • Educational projects demonstrating digital potentiometer concepts
  • Legacy system maintenance
  • Hobbyist projects requiring dual-channel resistance control

Modern equivalents include:

  • MCP4131/4132: Microchip 7/8-bit digital potentiometers
  • AD5204: Analog Devices quad digital potentiometer
  • MAX5160: Maxim 256-tap digital potentiometer
  • DS1803: Dallas/Maxim dual digital potentiometer (newer)

The DS1267-100 is particularly valued for its non-volatile memory feature, which maintains wiper positions through power cycles. This makes it ideal for applications where settings need to be preserved.

Graph View

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