Renesas R5F2138CSNFP#30

Overview

R5F2138CSNFP#30 from Renesas is a 16-bit R8C CPU core microcontroller with 128 KB flash program ROM, 10 KB RAM, and integrated touch sensor control unit (TSCU) supporting 36-channel electrostatic capacitive touch detection. It operates at up to 20 MHz (VCC = 2.7–5.5 V), features 75 CMOS I/O ports with high-current drive capability, and includes UART0 (2 channels), UART2 (1 channel with I²C mode), LIN hardware module, 10-bit × 20-channel ADC, and on-chip data flash with background operation (BGO) for seamless firmware updates in consumer appliance control systems.

For engineers reviewing the R5F2138CSNFP#30 datasheet, R5F2138CSNFP#30 pinout, R5F2138CSNFP#30 application, or R5F2138CSNFP#30 equivalent, key selection considerations include its N-version temperature range (−20°C to +85°C), 80-pin LQFP package (PLQP0080KB-A), integrated TSCU for button/slider UIs, and dual-clock domain support (XIN/XCIN oscillators + on-chip high/low-speed oscillators) enabling low-power wake-up and real-time clock functionality.

Technical Context

The R5F2138CSNFP#30 implements the R8C CPU core with 89 fundamental instructions, 1 Mbyte address space, and hardware multiplier (16×16→32 bits) plus multiply-accumulate capability. Its memory architecture separates program ROM (128 KB), data flash (4 × 1 KB blocks), and RAM (10 KB), all accessible via unified addressing with dedicated SFR regions for peripheral control.

Peripheral integration includes event link controller (ELC) for autonomous inter-peripheral triggering (30 sources × 10 operations), DTC for efficient data transfers without CPU intervention, and three timer families (RJ, RB2, RC) supporting PWM generation, input capture, pulse width measurement, and real-time clock mode via Timer RE2 - all synchronized to configurable clock domains including low-power XCIN (32 kHz).

Key Specifications

Pinout & Package

Package: 80-pin LQFP (PLQP0080KB-A), 0.5 mm pitch, 12 × 12 mm body size, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F2138ASDFP and R5F21388SNFP, the R5F2138CSNFP#30 provides maximum on-chip memory (128 KB/10 KB) and full TSCU channel count (36) within the N-temperature grade, making it optimal for feature-rich consumer UIs where code growth and touch complexity are design constraints.

Availability

R5F2138CSNFP#30 is available at Aetrix Electronics and suitable for home appliance control panels, office equipment keypads, and audio system remotes requiring stable component supply across long production lifecycles.

Supply support for R5F2138CSNFP#30 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 solutions for automotive, industrial, and consumer markets.

The R8C/38T-A Group targets cost-sensitive, low-power embedded applications requiring integrated touch sensing, robust serial connectivity (LIN/I²C/UART), and deterministic real-time control - optimized for white goods and human-interface devices.

FAQ

What is the maximum operating frequency of the R5F2138CSNFP#30 and under what voltage conditions?

The R5F2138CSNFP#30 achieves a maximum CPU clock of 20 MHz when powered at VCC = 2.7 V to 5.5 V. At lower voltages (1.8 V to 5.5 V), the maximum frequency is reduced to 5 MHz to ensure stable operation and meet electrical specifications across the full voltage range.

Does the R5F2138CSNFP#30 support hardware LIN communication, and which peripherals are involved?

Yes, the R5F2138CSNFP#30 integrates a dedicated HW-LIN_0 module compliant with LIN 2.1 and SAE J2602. It uses Timer RJ_0, UART0_0, or UART0_1 for physical layer signaling - eliminating software bit-banging and ensuring precise timing for automotive-grade diagnostics and control networks.

How many touch sensing channels does the R5F2138CSNFP#30 support, and are external components required?

The R5F2138CSNFP#30 supports 36 electrostatic capacitive touch sensing channels via its integrated Touch Sensor Control Unit (TSCU). No external RC networks or dedicated touch controller ICs are required - all signal conditioning and charge-transfer measurement is performed on-die.

What power-saving modes are available on the R5F2138CSNFP#30, and what are their typical current consumptions?

The R5F2138CSNFP#30 offers wait mode (4.0 µA at 3.0 V, 32 kHz XCIN clock) and stop mode (2.2 µA at 3.0 V). Both modes retain RAM content and allow wake-up via external interrupt or RTC alarm, enabling multi-year battery operation in portable consumer devices.

Is the R5F2138CSNFP#30 pin-compatible with other members of the R8C/38T-A Group, such as R5F21388SNFP or R5F2138ASDFP?

Yes, all R8C/38T-A Group MCUs, including R5F2138CSNFP#30, R5F21388SNFP, and R5F2138ASDFP, share identical 80-pin LQFP (PLQP0080KB-A) packaging and pinout - enabling hardware reuse across product variants with different memory configurations and temperature grades.