Renesas R5F11W68DSM#70

Overview

R5F11W68DSM#70 from Renesas Electronics is an 8-bit RL78/G1M microcontroller with 8 KB flash memory, 1 KB RAM, and ultra-low-power operation (0.61 µA in STOP mode). It features a 20-pin TSSOP package, 8-channel 8/10-bit ADC, UART/CSI serial interfaces, four 16-bit timers, and operates across –40°C to +85°C for industrial sensor and control applications.

For engineers reviewing the R5F11W68DSM#70 datasheet, R5F11W68DSM#70 pinout, R5F11W68DSM#70 application, or R5F11W68DSM#70 equivalent, this page delivers verified technical context, real-world design meaning for each specification, validated pin functions, and two confirmed alternative parts for industrial-grade embedded control designs requiring low power, compact footprint, and integrated analog peripherals.

Technical Context

The R5F11W68DSM#70 implements the RL78-S1 CPU core with a 3-stage pipeline, supporting instruction execution times from 0.05 µs (20 MHz) to 0.8 µs (1 MHz). Its memory subsystem includes 8 KB on-chip flash with on-chip debug, 1 KB RAM, and selectable power-on-reset (SPOR) with four detection thresholds (2.25 V–4.45 V).

Peripherals include a 12-bit interval timer, watchdog timer, programmable clock/buzzer output (PCLBUZ0), key interrupt support (KR0–KR7), and real-time output capability (8 channels). All I/O pins support N-ch open-drain configuration with on-chip pull-up resistors (10–100 kΩ), and analog inputs (ANI0–ANI7) operate at VDD = 2.4–5.5 V.

Key Specifications

Pinout & Package

Package: 20-pin plastic TSSOP (4.4 × 6.5 mm, 0.65 mm pitch), industrial-grade moisture sensitivity level (MSL) 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F11W67DSM#70, the R5F11W68DSM#70 offers double flash/RAM for complex control algorithms and field upgrades; versus R5F11Y68DSM#70, it retains full RTIO and real-time output capability at lower I/O drive strength-making it optimal for timing-critical, resource-constrained industrial controllers.

Availability

R5F11W68DSM#70 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart thermostats, programmable power monitors, and motorized valve actuators requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature operation.

Supply support for R5F11W68DSM#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 global semiconductor leader headquartered in Tokyo, Japan, specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The RL78/G1M product line is designed for cost-sensitive, ultra-low-power industrial control applications where deterministic real-time response, integrated analog peripherals, and extended temperature operation are essential-exemplified by the R5F11W68DSM#70's 8 KB flash, RTIO, and 0.61 µA STOP mode.

FAQ

What is the maximum operating frequency of the R5F11W68DSM#70?

The R5F11W68DSM#70 supports a maximum high-speed on-chip oscillator frequency of 20 MHz, enabling a minimum instruction execution time of 0.05 µs. This frequency is selectable via option byte bits 0–2 and remains stable across its full operating voltage range (2.25–5.5 V) and temperature range (–40°C to +85°C). The R5F11W68DSM#70 does not require an external crystal for full-speed operation.

Does the R5F11W68DSM#70 support hardware debugging during development?

Yes, the R5F11W68DSM#70 includes an on-chip debug function compatible with Renesas E2 emulator and CS+ IDE. It supports breakpoints, watchpoints, and flash programming via the TOOL0 pin. However, Renesas explicitly cautions against using this debug function in mass-produced units due to potential flash endurance limitations-production firmware should disable debug interfaces before final programming.

Can the R5F11W68DSM#70 drive LEDs directly without external transistors?

Yes, the R5F11W68DSM#70 can drive LEDs directly using its N-ch open-drain I/O pins (e.g., P00–P05) with on-chip pull-up resistors (10–100 kΩ). Each pin supports up to 40 mA sink current, and the total sink current across all pins is rated at 160 mA. For higher brightness or multi-LED arrays, external current-limiting resistors must be used to stay within absolute maximum ratings.

What ADC reference voltage does the R5F11W68DSM#70 use?

The R5F11W68DSM#70 uses VDD as the ADC reference voltage (VREF+) and VSS as VREF–, supporting analog input ranges from 0 V to VDD (2.4–5.5 V). It does not include an internal voltage reference or external VREF pin. Resolution is selectable between 8-bit (256 steps) and 10-bit (1024 steps), with typical INL of ±1 LSB-sufficient for temperature sensing with ±0.5°C accuracy using a 10 kΩ NTC thermistor.

Is the R5F11W68DSM#70 pin-compatible with other RL78/G1M devices?

Yes, the R5F11W68DSM#70 shares the same 20-pin TSSOP package and pinout with all RL78/G1M 20-pin variants (e.g., R5F11W67DSM#70, R5F11Y68DSM#70), including identical VDD/VSS placement, RESET, and peripheral pin assignments. However, functional differences exist: R5F11Y68DSM#70 replaces RTIO pins with high-current P-ch outputs, so firmware and schematic validation is required before substitution.