A 4×3 Membrane Switch Matrix Keypad is commonly used in various applications such as calculators, telephones, and embedded systems for entering numeric data.
specifications:
Electrical Characteristics:
Operating Voltage: 3.3V to 5V DC
Operating Current: Less than 20 mA (depending on the pull-up resistors used)
Contact Resistance: Typically less than 500 Ω
Insulation Resistance: More than 100 MΩ at 250V DC
Dielectric Strength: Can withstand up to 250V AC for 1 minute
Key Matrix Configuration:
Rows: 4
Columns: 3
Total Keys: 12 keys (usually labeled 0-9, *, #)
Connection Type: 7 pins (4 for rows and 3 for columns)
Mechanical Characteristics:
Actuation Force: Typically around 150-200 grams
Environmental Characteristics:
Operating Temperature: -40°C to +80°C
Storage Temperature: -40°C to +85°C
Humidity: Up to 95% RH, non-condensing
Pin Configuration:
Pin 1-4: Correspond to Rows 1-4
Pin 5-7: Correspond to Columns 1-3
Wiring and Interface:
Connection: Often through a flexible ribbon cable with a standard connector or direct soldering onto a PCB.
Compatibility: Generally compatible with microcontrollers like Arduino, PIC, or AVR for interfacing through GPIO pins.
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