Texas Instruments TCA8418RTWR
| Parameters | |
|---|---|
| Series | - |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) |
| RoHS Status | ROHS3 Compliant |
| Package / Case | 24-WFQFN Exposed Pad |
| Interface | I²C, 2-Wire Serial |
| Mfr | Texas Instruments |
| Mounting Type | Surface Mount |
| Applications | PDA's, Portable Audio/Video, Smartphones |
| Supplier Device Package | 24-WQFN (4x4) |
| Voltage - Supply | 1.65V ~ 3.6V |
| Package | Tape & Reel (TR) |
| Product Status | Active |
| Base Product Number | TCA8418 |
| REACH Status | REACH Unaffected |
| Standard Package | 3,000 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
TCA8418RTWR I²C GPIO expander, keyboard scanner IC
The TCA8418RTWR is a low-power, I²C-interfaced 18-bit GPIO expander with integrated keypad scanning engine from Texas Instruments, designed for human-machine interface (HMI) applications in consumer electronics, industrial control panels, and automotive systems. This advanced IC combines 18 programmable GPIO pins with built-in keypad decoding logic capable of scanning up to 8×10 matrix keyboards (80 keys), significantly reducing host processor overhead in button-intensive designs. Operating from 1.65V to 3.6V supply voltage, the device features ultra-low standby current (1μA typical) and supports interrupt-driven operation with programmable edge detection, making it ideal for battery-powered touch panels and smart appliances. The integrated debounce circuitry (adjustable from 0ms to 64ms) ensures reliable key detection even with mechanical switch bounce, while the auto-sleep/wake functionality further optimizes power consumption in intermittently used interfaces.
Texas Instruments provides complete development support including evaluation modules, configuration software, and reference designs for common keyboard layouts. The device's 2kV ESD protection (HBM) on all pins enhances reliability in electrically noisy environments, and its schmitt-trigger inputs ensure noise immunity for stable operation. Unique features like key release detection, two-key rollover reporting, and programmable key repeat function make the TCA8418RTWR particularly suitable for gaming peripherals, POS terminals, and home automation control panels where responsive and reliable user input is critical.
Alternative Models & Key Features:
● TCA6408ARGTR: 8-bit I²C GPIO expander with interrupt output (no keypad scanning)
● PCA9538PW: NXP alternative with 8 I/O ports and lower 400kHz I²C speed
● MAX7313AUG+: Maxim's 16-bit GPIO with interrupt and LED driver capability
● MCP23018-E/SS: Microchip's 16-bit expander with SPI interface and mirror mode
● CY8C9520A-24PVXI: Cypress PSoC-based 20-port expander with capacitive sensing
