Renesas R5F1211AASP#10

Overview

R5F1211AASP#10 from Renesas Electronics is a 10-pin, low-power RL78/G16 microcontroller with 16 KB code flash, 2 KB RAM, and integrated capacitive touch sensing (15-channel CTSU). It operates from 2.4–5.5 V, supports HALT/STOP modes, and delivers ultra-low-speed operation at 32.768 kHz (30.5 μs instruction time) for battery-powered human interface applications.

For engineers reviewing the R5F1211AASP#10 datasheet, R5F1211AASP#10 pinout, R5F1211AASP#10 application, or R5F1211AASP#10 equivalent, key selection considerations include its 10-pin LSSOP package, consumer-grade temperature range (−40 to +85°C), 8/10-bit ADC with 4 analog inputs, and dual serial interfaces (UART + simplified I²C) in minimal footprint.

Technical Context

The R5F1211AASP#10 implements the RL78 CPU core with a 3-stage pipeline CISC architecture, enabling configurable instruction timing from 0.0625 μs (16 MHz high-speed on-chip oscillator) to 30.5 μs (32.768 kHz subsystem clock). It integrates a 12-bit interval timer, watchdog timer, and real-time clock with 99-year calendar support.

Its peripheral set includes an 8/10-bit A/D converter (4 channels, internal 0.815 V reference), two comparator channels, and a dedicated capacitive touch sensing unit supporting self- and mutual-capacitance configurations - all managed via hardware-accelerated CTSU logic without CPU intervention during scanning.

Key Specifications

Pinout & Package

Package: 10-pin plastic LSSOP (4.4 × 3.6 mm, 0.65-mm pitch), surface-mount, consumer-grade (A).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with R5F1211CASP#10 and RL78/G14 R5F104BAASP#10, the R5F1211AASP#10 uniquely balances minimal 10-pin footprint, integrated CTSU, and consumer-grade cost - making it optimal for space-constrained touch UIs where flash headroom is secondary to bill-of-materials simplification.

Availability

R5F1211AASP#10 is available at Aetrix Electronics and suitable for home appliance control panels, smart thermostats, and wireless remote controls requiring stable component supply across production ramp and long-term maintenance cycles.

Supply support for R5F1211AASP#10 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

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, and power management ICs for automotive, industrial, and IoT markets.

The RL78/G16 product line targets ultra-low-power embedded applications demanding integrated human-machine interface capabilities - especially capacitive touch, precise timing, and robust operation across extended temperature ranges.

FAQ

What is the maximum operating frequency of the R5F1211AASP#10?

The R5F1211AASP#10 supports up to 16 MHz operation using its high-speed on-chip oscillator. Instruction execution time scales accordingly: minimum 0.0625 μs at 16 MHz, extending to 30.5 μs at 32.768 kHz for ultra-low-power modes. The oscillator's ±1.0% accuracy over −20 to +85°C eliminates need for external crystals in most consumer applications.

Does the R5F1211AASP#10 support in-system programming?

Yes, the R5F1211AASP#10 supports self-programming of both code and data flash memory without requiring a boot swap function. It includes flash shield window protection to prevent unauthorized read-out of code memory, and erase/write operations are performed in 1 KB (code) or 512 B (data) blocks with guaranteed 1,000,000 write cycles for data flash.

How many capacitive touch channels does the R5F1211AASP#10 support?

The R5F1211AASP#10 integrates a dedicated Capacitive Touch Sensing Unit (CTSU) supporting up to 15 channels in self-capacitance mode (one key per pin) or up to 16 keys in mutual-capacitance matrix configuration using transmit/receive pin selection from the same 15-pin pool - all handled in hardware without CPU load during scan.

What communication interfaces are available on the R5F1211AASP#10?

The R5F1211AASP#10 provides one UART channel, one simplified I²C (SI²C) channel, and one simplified SPI (CSI) channel - all multiplexed on shared pins. It does not include full I²C or standard SPI peripherals. UART supports asynchronous communication; SI²C supports slave-only operation with fixed addressing; CSI supports master-only mode with configurable clock polarity and phase.

Is the R5F1211AASP#10 pin-compatible with other RL78/G16 variants in 10-pin LSSOP?

Yes, all RL78/G16 10-pin LSSOP variants - including R5F1211AASP#10, R5F1211CASP#10, R5F1211AGSP#10, and R5F1211AMSP#10 - share identical pinout, electrical characteristics, and mechanical footprint. Only flash size (16 KB vs. 32 KB) and temperature grade (A/G/M) differ between these part numbers.