STMicroelectronics STMPE2403TBR

Overview

STMPE2403TBR from STMicroelectronics is a 24-bit I²C GPIO port expander with integrated keypad controller (8×12 matrix), three 8-bit PWM outputs for LED brightness/blink control, interrupt output, and ultra-low standby current (15–40 µA). It serves as a system-level peripheral interface IC in mobile multimedia platforms to extend host ASIC GPIO resources while enabling key scanning, backlight dimming, and rotator decoding.

For engineers reviewing the STMPE2403TBR datasheet, STMPE2403TBR pinout, STMPE2403TBR application, or STMPE2403TBR equivalent, this device is selected for low-power portable systems requiring concurrent keypad scanning, programmable PWM timing, and configurable hotkey wake-up on individual GPIOs - all within a 3.6×3.6 mm TFBGA36 package.

Technical Context

The STMPE2403TBR implements a hierarchical register-mapped architecture with dedicated modules: Keypad Controller (supports 96-key scan, ghost key handling, and wake-from-hibernate), PWM Controller (three independent 8-bit channels with programmable duty cycle and frequency), and GPIO Controller (24 pins individually configurable as input/output/alternate function with Schmitt-trigger inputs and 5–35 Ω MUX-on resistance).

Its I²C interface complies with Philips I²C v2.1, supports Standard (100 kbps) and Fast (400 kbps) modes, and allows up to four devices on one bus via ADDR0/ADDR1 pin-programmed slave addresses (0x84–0x8A). Power management includes autosleep, hibernate mode, and per-GPIO wake-up capability triggered by configurable pulse width detection.

Key Specifications

Pinout & Package

STMPE2403TBR uses a 36-ball TFBGA package (3.6×3.6 mm, 0.5 mm pitch), optimized for space-constrained mobile PCB layouts. Ball assignment follows JEDEC MO-220 standard with defined mechanical and thermal characteristics (R_thJA = 100 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar GPIO expansion and keypad interface applications.

Compared with TCA6424A and PCA9555, the STMPE2403TBR uniquely integrates keypad scan logic, three PWM generators, and rotator decoding - eliminating host CPU overhead and external components required by those alternatives for equivalent functionality.

Availability

STMPE2403TBR is available at Aetrix Electronics and suitable for smartphone keypad interfaces, portable media player backlight control, game console D-pad systems, and industrial handheld terminal input subsystems requiring stable component supply and long-term lifecycle support.

Supply support for STMPE2403TBR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in microcontrollers, power management, analog, and MEMS technologies for automotive, industrial, and consumer markets.

The STMPE series targets portable electronics peripheral expansion, designed specifically to reduce host processor load and power consumption in battery-powered devices with complex human-interface requirements.

FAQ

What is the maximum keypad matrix size supported by the STMPE2403TBR?

The STMPE2403TBR supports up to an 8×12 matrix (96 keys) using its dedicated hardware keypad controller. KP_X0–KP_X7 serve as column inputs, and KP_Y0–KP_Y11 serve as row outputs. The controller handles scan sequencing, ghost key detection, and priority-based key reporting without host CPU involvement.

Can the PWM outputs drive LEDs directly, and what is their current capability?

Yes, the three PWM outputs (PWM1–PWM3) can drive LEDs directly with a sink current capability of 16 mA per channel. Output voltage specifications are V_OH ≥ 1.35 V and V_OL ≤ 0.45 V at 1.8 V supply, ensuring reliable logic-level compatibility with common LED driver configurations.

How does the STMPE2403TBR manage power in battery-operated devices?

The device offers three low-power states: active (1.2–1.6 mA), sleep (55–120 µA), and hibernate (15–40 µA). Each GPIO supports configurable hotkey wake-up, and the keypad controller can detect presses while in hibernate mode - enabling instant responsiveness with minimal battery drain.

Is the STMPE2403TBR pin-compatible with other ST port expanders like the STMPE2401?

Yes, the STMPE2403TBR shares identical pinout and package with the STMPE2401, including TFBGA36 footprint and ball mapping. Register-level differences exist (e.g., enhanced keypad features), but hardware layout and PCB design are fully interchangeable for drop-in replacement or migration.