STMicroelectronics STM8TL53C4U6

Overview

STM8TL53C4U6 from STMicroelectronics is an 8-bit ultra-low-power touch-sensing microcontroller featuring 16 Kbyte Flash, ProxSense™ capacitive proximity acquisition, 16 MHz STM8 core, and integrated peripherals including USART, SPI, I²C, two 16-bit timers, and beeper timer. It operates from 1.65 V to 3.6 V across –40 °C to +85 °C and targets battery-powered human-interface applications such as touch-enabled remote controls and smart appliance panels.

For engineers reviewing the STM8TL53C4U6 datasheet, STM8TL53C4U6 pinout, STM8TL53C4U6 application, or STM8TL53C4U6 equivalent, key selection criteria include ProxSense™ channel count (up to 300), ultra-low Halt-mode current (0.4 µA), 23 I/Os with programmable pull-ups, SWIM debug interface, and UFQFPN28 package compatibility for space-constrained designs.

Technical Context

The STM8TL53C4U6 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its dual-voltage regulator architecture separates main logic (VDD) from ProxSense™ analog circuitry (VDD_PXS), enabling independent optimization of noise immunity and power efficiency during capacitive sensing.

ProxSense™ employs patented transmitter/receiver channel pairing-supporting up to 20 TX/RX and 15 TX-only channels-to implement projected capacitive proximity detection without external components. The peripheral set includes dedicated hardware for auto-wakeup (AWU), independent/window watchdogs, and fractional-baud-rate USART for robust serial communication in low-power systems.

Key Specifications

Pinout & Package

The STM8TL53C4U6 is housed in a 28-pin UFQFPN (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are validated per Figure 3 ("STM8TL53G4U6 28-pin UFQFPN package pinout") in DocID022344 Rev 7.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power touch-sensing microcontroller applications.

Compared with STM8L152C6U6, the STM8TL53C4U6 delivers hardware-accelerated proximity with 30× lower active-halt current; versus STM32L053R8T6, it offers turnkey capacitive sensing at half the active power and simpler firmware stack, ideal for cost- and battery-sensitive HMI endpoints.

Availability

STM8TL53C4U6 is available at Aetrix Electronics and suitable for smart remote controls, appliance touch panels, interactive kiosks, and medical device interfaces requiring stable component supply, long-lifecycle support, and guaranteed traceability for industrial and consumer OEM programs.

Supply support for STM8TL53C4U6 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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog devices for automotive, industrial, and consumer markets.

The STM8TL5xxx series was developed specifically for ultra-low-power human-machine interface applications, integrating ProxSense™ capacitive sensing technology to eliminate mechanical buttons and enable robust, sealed, gesture-capable user interfaces.

FAQ

What is the maximum operating frequency and core performance of the STM8TL53C4U6?

The STM8TL53C4U6 features an STM8 8-bit core with a maximum clock frequency of 16 MHz and delivers 16 CISC MIPS peak performance. Its Harvard architecture with 3-stage pipeline ensures deterministic instruction execution, making it suitable for real-time touch firmware with sub-millisecond response requirements.

How does the ProxSense™ technology differ from standard capacitive touch implementations?

ProxSense™ is a patented hardware-accelerated acquisition engine supporting up to 300 virtual touch channels using dedicated TX/RX pin pairs. Unlike software-based charge-transfer methods, it integrates analog front-end filtering, automatic baseline tracking, and noise suppression - reducing CPU load and enabling reliable proximity detection through thick overlays without external components.

What package and pin count does the STM8TL53C4U6 use, and are thermal pads supported?

The STM8TL53C4U6 uses a 28-pin UFQFPN package (7 × 7 mm, 0.5 mm pitch) with an exposed thermal pad on the underside. This pad must be soldered to a PCB thermal plane for optimal thermal dissipation and noise immunity, especially during ProxSense™ operation where analog stability is critical.

Can the STM8TL53C4U6 operate from a single power supply, or are separate supplies required?

The STM8TL53C4U6 requires two independent power domains: VDD/VSS for digital logic and VDD_PXS/VSS_PXS for the ProxSense™ analog circuitry. These must be supplied separately - even if derived from the same source - with dedicated decoupling and routing to prevent noise coupling that would degrade proximity sensitivity and increase active-halt current.