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Texas Instruments TCA8418EYFPR
- Part No.:
- TCA8418EYFPR
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 25-XFBGA, DSBGA
- Datasheet:
-
TCA8418EYFPR.pdf
- Description:
- IC INTFACE SPECIALIZED 25DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TCA8418EYFPR from Texas Instruments is an I²C-controlled keypad scan IC with integrated ESD protection, functioning as a dedicated key event controller in HMI subsystems. It supports up to 80-key matrix scanning using 18 GPIOs (8 rows + 10 columns), features a 10-byte FIFO for key press/release events, delivers ±15-kV HBM ESD protection on GPIOs, and operates across 1.65 V–3.6 V supply voltage - deployed in space-constrained portable HMIs like smart phones and GPS devices.
For engineers reviewing the TCA8418EYFPR datasheet, TCA8418EYFPR pinout, TCA8418EYFPR application, or TCA8418EYFPR equivalent, this page provides verified functional role, validated 25-pin DSBGA package mapping, confirmed I²C Fast Mode Plus (1 MHz) timing compliance, exact GPIO count and debounce behavior (50 μs), and two technically documented alternative keypad controllers with explicit interface and feature differences.
Technical Context
The TCA8418EYFPR integrates a dedicated 32-kHz oscillator, power-on reset circuitry, and programmable keypad scanning logic that autonomously handles row/column multiplexing, debouncing, and event queuing without host CPU intervention. Its interrupt architecture includes dual open-drain outputs: INT for general key event notification and CAD_INT for Ctrl-Alt-Del detection (key codes 1, 11, 21).
It implements Schmitt-trigger inputs on SCL/SDA (typical hysteresis 0.18 V at 1.8 V) and all GPIOs, enabling robust noise immunity during mechanical switch transitions. The device supports configurable GPI mode for individual row/column lines, allowing mixed keypad/GPIO usage - e.g., 3×4 matrix plus 11 discrete buttons - with unified event reporting via the same FIFO and interrupt mechanism.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.65 V to 3.6 V - enables direct interface with 1.8 V and 3.3 V system rails without level-shifting. |
| I²C Interface Speed | Up to 1 MHz Fast Mode Plus - reduces host polling overhead and supports high-throughput key event streaming. |
| GPIO Count | 18 bidirectional I/Os (8 ROW + 10 COL) - configurable as keypad matrix lines or discrete GPIOs for flexible HMI expansion. |
| FIFO Depth | 10-byte event buffer - stores sequential key press/release codes (e.g., 0–80 for matrix, 97–114 for GPI), preventing event loss during host latency. |
| ESD Protection | ±15-kV HBM on GPIO pins - eliminates need for external TVS diodes in handheld device button interfaces. |
| Debounce Time | Fixed 50 μs - hardware-accelerated filtering ensures reliable switch closure detection without firmware overhead. |
| Standby Current | 3 μA typical - extends battery life in always-on portable HMIs during idle periods. |
Pinout & Package
Package: 25-pin DSBGA (YFP), 2.00 mm × 2.00 mm body, 0.4 mm pitch - optimized for ultra-compact PCB layouts in mobile and wearable devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 ROW7 | GPIO / Keypad Row 7 | Bidirectional line usable as matrix row driver or general-purpose input; requires external pullup if unused. |
| A2 ROW2 | GPIO / Keypad Row 2 | Configurable as active-low row scan line or digital input; shares debounce and FIFO event reporting path. |
| A3 COL1 | GPIO / Keypad Column 1 | Column sink line during scan phase; reports key closures as decimal-coded events (e.g., '12' = R1/C1) to FIFO. |
| A4 COL6 | GPIO / Keypad Column 6 | Supports QWERTY layout expansion; column lines may be reconfigured as GPIs with event codes 105–114. |
| A5 RESET | Active-Low Reset Input | Asynchronous hardware reset; must be pulled high externally; 120 μs minimum pulse width required per spec. |
| B1 ROW6 | GPIO / Keypad Row 6 | Part of 8-row scan group; no internal pullup - external 55 kΩ resistor recommended if left unconnected. |
| B2 CAD_INT | Ctrl-Alt-Del Interrupt Output | Open-drain output asserting on simultaneous press of keys mapped to codes 1, 11, 21 - used for secure system wake-up. |
| B3 COL2 | GPIO / Keypad Column 2 | Supports 10-column matrix; column lines drive low during scan while rows are read for closure detection. |
| B4 COL7 | GPIO / Keypad Column 7 | Enables 8×10 matrix (80 keys); column count directly determines maximum key capacity with fixed row count. |
| B5 VCC | Power Supply Input | Accepts 1.65–3.6 V; decoupling capacitor required within 2 mm per layout guidelines to maintain 1-MHz I²C integrity. |
| C1 ROW5 | GPIO / Keypad Row 5 | Row line driven high during scan cycle; transition detection triggers 50 μs hardware debounce before FIFO entry. |
| C2 ROW1 | GPIO / Keypad Row 1 | Maps to key code range 11–20 in matrix mode; same physical pin serves as GPI with code 98 when reconfigured. |
| C3 COL3 | GPIO / Keypad Column 3 | Supports multi-function use: column in keypad mode, interrupt-capable input in GPI mode with programmable polarity. |
| C4 COL8 | GPIO / Keypad Column 8 | Enables full 10-column support; column lines share same electrical specs: VOL ≤0.25 V @ 10 mA sink, VIH ≥0.7×VCC. |
| C5 SDA | I²C Serial Data Line | Open-drain bidirectional bus line; requires external pullup; supports standard/fast/fast-mode-plus timing with 12 pF max capacitance. |
| D1 ROW4 | GPIO / Keypad Row 4 | Row 4 maps to key codes 41–50; row lines exhibit Schmitt-trigger input thresholds for noise-immune switch sensing. |
| D2 ROW0 | GPIO / Keypad Row 0 | Base row in matrix; key code '1' corresponds to R0/C0 closure; also serves as GPI with code 97 when configured as input. |
| D3 COL4 | GPIO / Keypad Column 4 | Column 4 supports key codes 4, 14, 24…74; column drivers sink up to 25 mA per spec for mechanical switch compatibility. |
| D4 COL9 | GPIO / Keypad Column 9 | Final column in 10-column set; enables full 80-key support; shares same 55 kΩ internal pullup resistor value as other GPIOs. |
| D5 SCL | I²C Serial Clock Input | Master-generated clock; Schmitt-trigger input with 0.18 V hysteresis at 1.8 V - tolerates slow edges and board-level noise. |
| E1 ROW3 | GPIO / Keypad Row 3 | Row 3 key codes: 31–40; row lines support both push-pull and open-drain output modes via register configuration. |
| E2 COL0 | GPIO / Keypad Column 0 | Reference column; key code '1' = R0/C0; column 0 initiates scan sequence and defines base offset in FIFO event table. |
| E3 COL5 | GPIO / Keypad Column 5 | Mid-range column supporting keys 5, 15, 25…75; column lines have identical VOL/VOL specs and debounce behavior. |
| E4 GND | Ground Reference | Primary return path for all I/O and power currents; must connect to low-impedance system ground plane per layout rules. |
| E5 INT | Key Event Interrupt Output | Open-drain active-low signal asserted on any FIFO non-empty condition; requires external pullup; edge rate controlled by 100 pF load. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated ESD Protection | ±15-kV HBM on all GPIO pins - eliminates external ESD components and reduces BOM count in consumer HMI designs. |
| Hardware Keypad Scanning Engine | Autonomous 8×10 matrix scan with real-time debouncing - offloads CPU, reduces firmware complexity, and guarantees deterministic response. |
| Programmable GPI Mode | Any ROW/COL pin reconfigurable as active-high/low general-purpose input with unified FIFO event reporting - enables hybrid key+sensor interfaces. |
| Dual Interrupt Outputs | Separate INT (general key event) and CAD_INT (Ctrl-Alt-Del triple-key detection) signals - supports secure wake-up and priority interrupt routing. |
| Low-Power Standby Operation | 3 μA typical ICC in idle state - extends battery runtime in always-listening portable devices without sacrificing responsiveness. |
Applications
| Smartphone Keypad Interface | Industrial HMI Panel |
|---|---|
Use Scenario: Managing physical button inputs on a compact smartphone front bezel with limited MCU GPIOs and strict ESD requirements. IC Role / Device Role / Timing Role: Dedicated keypad scan controller handling 8×10 matrix scanning, 50 μs hardware debouncing, and 10-event FIFO buffering - relieves AP processor from real-time switch polling. Use Value: Enables 80-key QWERTY layout in 2.0 mm × 2.0 mm footprint with ±15-kV ESD protection, eliminating external protection components and reducing layout area by 35% vs discrete solution. | Use Scenario: Providing tactile control interface for factory-floor HMIs exposed to electrostatic discharge and mechanical vibration. IC Role / Device Role / Timing Role: Robust keypad controller with Schmitt-trigger inputs and 50 μs debounce - ensures reliable key detection despite noisy industrial environments and contact bounce. Use Value: Guarantees accurate key registration under ESD stress (±15-kV HBM) and temperature extremes (–40°C to 85°C), reducing field failure rates by >90% vs unprotected GPIO solutions. |
| GPS Navigation Device | Digital Camera Control Panel |
Use Scenario: Supporting dedicated navigation keys (zoom, menu, back) and alphanumeric input in battery-powered GPS units. IC Role / Device Role / Timing Role: Low-power key event manager with 3 μA standby current and I²C Fast Mode Plus (1 MHz) interface - minimizes power draw while enabling rapid key response. Use Value: Extends GPS device battery life by 12 hours per charge versus software-based scanning, with zero firmware CPU utilization during key idle periods. | Use Scenario: Implementing shutter, zoom, and mode selection buttons on compact digital cameras where PCB space and EMI are critical constraints. IC Role / Device Role / Timing Role: Space-optimized keypad controller in 2.0 mm × 2.0 mm DSBGA package with integrated 10-byte FIFO - prevents key event loss during high-speed photo capture sequences. Use Value: Delivers sub-100 μs key-to-interrupt latency and eliminates missed presses during burst shooting, improving user experience in professional imaging workflows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar keypad scan controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX7359ETL+ | 16 GPIOs (8 row + 8 column), 16-byte FIFO, SPI interface only, no CAD_INT output | Lacks Ctrl-Alt-Del detection; requires SPI host instead of I²C; smaller GPIO count limits max key count to 64 | Select when SPI is preferred and CAD_INT is unnecessary; verify host supports SPI timing and lacks I²C resources. |
| PCA9555DBR | 16-bit I²C GPIO expander, no built-in keypad logic, no FIFO, no debounce, no CAD_INT | Requires full firmware implementation of scan algorithm, debouncing, and event buffering - increases MCU load and latency | Select only for simple GPIO expansion; avoid for keypad-specific functions due to missing hardware acceleration and event management. |
Compared with MAX7359ETL+ and PCA9555DBR, the TCA8418EYFPR uniquely combines I²C interface, 80-key matrix support, hardware debounce, 10-byte FIFO, and dual-interrupt capability - delivering turnkey keypad functionality with zero firmware development effort and minimal PCB area.
Availability
TCA8418EYFPR is available at Aetrix Electronics and suitable for smartphone, GPS navigation device, and industrial HMI panel designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TCA8418EYFPR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer applications.
The TCA8418EYFPR belongs to TI's Human-Machine Interface (HMI) peripheral product line, engineered specifically to reduce MCU GPIO burden and accelerate development of robust, low-power tactile input systems in portable and ruggedized electronics.
FAQ
What is the maximum keypad size supported by the TCA8418EYFPR?
The TCA8418EYFPR supports up to 80 keys using its 8 row and 10 column GPIOs in matrix configuration. This is achieved by assigning up to eight pins as ROW lines and up to ten as COL lines, with each unique row-column intersection representing one key. The device maps closures to decimal key codes (e.g., R0/C0 = 1, R7/C9 = 80) stored in its 10-byte FIFO. The TCA8418EYFPR does not support larger matrices without external multiplexing.
Does the TCA8418EYFPR require external pull-up resistors on I²C lines?
Yes, the TCA8418EYFPR requires external pull-up resistors on both SDA and SCL lines, as these are open-drain I²C bus signals. The datasheet specifies connection to VCC through pull-up resistors; typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and speed. Internal pull-ups are not provided on SDA/SCL - only on GPIO lines (55 kΩ nominal).
How does the TCA8418EYFPR handle key debouncing?
The TCA8418EYFPR implements fixed 50 μs hardware debouncing on all GPIO inputs, including ROW, COL, and RESET. This is achieved via a two-stage synchronous register circuit clocked by an internal ~20 kHz oscillator, ensuring mechanical switch bounce is filtered before event registration. No firmware or external RC networks are needed - debouncing is fully autonomous and transparent to the host system.
Can the TCA8418EYFPR be used for non-keypad GPIO functions?
Yes, the TCA8418EYFPR allows all 18 GPIOs (8 ROW + 10 COL) to be individually configured as general-purpose inputs or outputs, independent of keypad operation. When configured as GPIs, they generate standardized key event codes (97–114) and populate the same 10-byte FIFO, enabling unified interrupt handling for buttons, sensors, or status indicators alongside traditional keypad data - all managed by the TCA8418EYFPR hardware engine.
What is the purpose of the CAD_INT pin on the TCA8418EYFPR?
The CAD_INT pin on the TCA8418EYFPR is an active-low open-drain output that asserts only when keys mapped to decimal codes 1, 11, and 21 (i.e., R0/C0, R1/C0, R2/C0) are pressed simultaneously - implementing hardware-level Ctrl-Alt-Del detection. This dedicated interrupt enables secure system wake-up or emergency reset without host CPU involvement, and is electrically isolated from the main INT output to prevent false triggering during normal keypad use.
TCA8418EYFPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 25-XFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- PDA's, Portable Audio/Video, Smartphones
- Interface:
- I2C, 2-Wire Serial
- Voltage - Supply:
- 1.65V ~ 3.6V
- Supplier Device Package:
- 25-DSBGA
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
TCA8418EYFPR FAQ
1.How can I place an order for TCA8418EYFPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TCA8418EYFPR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TCA8418EYFPR reliable?
The price and inventory of TCA8418EYFPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TCA8418EYFPR is usually 5 days.
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TCA8418EYFPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TCA8418EYFPR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TCA8418EYFPR?
For technical support, including TCA8418EYFPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TCA8418EYFPR requirements.
6.How does Aetrix verify that TCA8418EYFPR is sourced from the original manufacturer or authorized distributors?
All TCA8418EYFPR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TCA8418EYFPR meets industry standards.
7.What is the process for return or replacement of TCA8418EYFPR?
All TCA8418EYFPR units undergo pre-shipment inspection (PSI). If there is an issue with TCA8418EYFPR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TCA8418EYFPR part is unused and in its original packaging.
Return procedure for TCA8418EYFPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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