Renesas R5F1211CASP#70

Overview

R5F1211CASP#70 from Renesas Electronics is a 10-pin LSSOP 8-bit RL78/G16 microcontroller with 32 KB flash, 2 KB RAM, and integrated capacitive touch sensing (15-channel CTSU), designed for ultra-low-power consumer and industrial control applications operating from 2.4–5.5 V. It features an RL78 CPU core (3-stage pipeline), 16-bit timer array (8 channels), 8/10-bit ADC (4 analog inputs), and real-time clock with calendar function.

For engineers reviewing the R5F1211CASP#70 datasheet, R5F1211CASP#70 pinout, R5F1211CASP#70 application, or R5F1211CASP#70 equivalent, key selection criteria include its 10-pin LSSOP package, 32 KB code flash with self-programming, 15-channel touch interface, and support for STOP/HALT low-power modes down to −40°C to +85°C operation.

Technical Context

The R5F1211CASP#70 implements the RL78 CPU core with CISC architecture and configurable instruction timing (0.0625 μs min @ 16 MHz high-speed oscillator or 30.5 μs @ 32.768 kHz subsystem clock). Its memory subsystem includes 32 KB code flash (1 KB blocks, erase-before-write) and 1 KB data flash (512 B blocks, 1M rewrite cycles).

Peripheral integration includes simplified SPI (1 channel), UART (1 channel), simplified I²C (1 channel), 16-bit timer array (8 channels), watchdog timer, RTC2 with 99-year calendar, and a dedicated capacitive touch sensing unit supporting both self- and mutual-capacitance configurations across 15 pins.

Key Specifications

Pinout & Package

10-pin plastic LSSOP (4.4 × 3.6 mm, 0.65-mm pitch) with exposed pad not electrically connected. Pin 1 is marked by index notch; pin numbering follows standard counter-clockwise top-view convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F1211AASP#70, the R5F1211CASP#70 provides double the code flash for complex UI or OTA update support; compared with R5F1214CASP#70, it trades pin count and peripheral expansion for minimal board area in space-constrained consumer HMI designs.

Availability

R5F1211CASP#70 is available at Aetrix Electronics and suitable for home appliance control panels, industrial sensor nodes, smart thermostats, and consumer IoT remotes requiring stable component supply and long-term production continuity.

Supply support for R5F1211CASP#70 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 Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and enterprise markets.

The RL78/G16 product line delivers ultra-low-power 8-bit MCUs optimized for cost-sensitive, battery-operated, and touch-enabled consumer and industrial control applications with integrated analog and timing peripherals.

FAQ

What is the maximum operating frequency of the R5F1211CASP#70 CPU core?

The R5F1211CASP#70 RL78 CPU core achieves a minimum instruction execution time of 0.0625 μs when running at 16 MHz using the high-speed on-chip oscillator. This corresponds to a maximum sustained operating frequency of 16 MHz under specified VDD (2.4–5.5 V) and temperature (−40°C to +85°C) conditions. The core supports dynamic clock switching to lower frequencies including 32.768 kHz for ultra-low-power RTC operation.

Does the R5F1211CASP#70 support in-circuit debugging and flash programming?

Yes, the R5F1211CASP#70 includes an on-chip debug interface accessible via P40 (TOOL0), P00 (TOOLTxD), and P01 (TOOLRxD) pins. It supports full in-circuit debugging, flash programming, and self-programming of code flash memory without requiring external boot ROM or swap mechanisms. Flash shield window functionality is implemented to prevent unauthorized read-out of protected firmware sections.

How many capacitive touch channels does the R5F1211CASP#70 support, and what configuration options are available?

The R5F1211CASP#70 integrates a dedicated Capacitive Touch Sensing Unit (CTSU) supporting up to 15 independent touch channels. It operates in self-capacitance mode (one pin per key, up to 15 keys) or mutual-capacitance mode (matrix configuration using selected transmit/receive pins from the 15 available, supporting up to 16 keys). No external RC components are required, and touch processing is handled entirely in hardware with background scanning capability.

What are the analog input capabilities of the R5F1211CASP#70, including resolution and reference options?

The R5F1211CASP#70 features an 8/10-bit successive approximation ADC with four analog input channels (ANI0–ANI3). It supports multiple reference voltage sources: external reference (VREF+ and VREF−), internal reference (0.815 V typical), and AVDD/AVSS. The ADC operates across the full VDD range (2.4–5.5 V) and includes built-in temperature sensor and touch voltage (TSCAP) measurement capability, enabling system-level calibration without external components.

Is the R5F1211CASP#70 qualified for industrial temperature operation?

No, the R5F1211CASP#70 is an A-grade part qualified for consumer applications with an operating ambient temperature range of −40°C to +85°C. For industrial applications requiring −40°C to +105°C (G-grade) or −40°C to +125°C (M-grade), Renesas offers functionally identical variants such as R5F1211CGSP#70 and R5F1211CMSP#70, which share the same 10-pin LSSOP package and feature set but are tested and guaranteed across extended temperature ranges.