Renesas R5F11Y67ASM#50

Overview

R5F11Y67ASM#50 from Renesas is an RL78/G1N-series 16-bit microcontroller in 20-pin TSSOP package, featuring 4 KB flash memory, 512 B RAM, 8-channel 8/10-bit ADC, UART/CSI serial interfaces, and ultra-low-power HALT/STOP modes. It operates from 2.0–5.5 V across –40°C to +85°C and targets battery-powered sensor nodes and consumer control panels.

For engineers reviewing the R5F11Y67ASM#50 datasheet, R5F11Y67ASM#50 pinout, R5F11Y67ASM#50 application, or R5F11Y67ASM#50 equivalent, key selection criteria include its 4 KB flash capacity, 20-pin TSSOP (0.65 mm pitch) footprint, 8-channel analog input support, high-current P-ch open-drain I/O capability, and compatibility with Renesas' RL78 development toolchain.

Technical Context

The R5F11Y67ASM#50 implements the RL78-S1 CPU core with 3-stage pipeline, supporting instruction execution times from 0.05 µs (20 MHz) to 0.8 µs (1 MHz). Its peripheral set includes a 4-channel 16-bit timer array (TAU), 12-bit interval timer, watchdog timer, and programmable clock/buzzer output (PCLBUZ0).

It integrates dual on-chip oscillators: a high-speed oscillator selectable from 1.25–20 MHz (±2% accuracy at –20°C to +85°C) and a 15 kHz low-speed oscillator (±15%). The device supports peripheral I/O redirection via PIOR register and features selectable power-on-reset (SPOR) with four detection voltage thresholds.

Key Specifications

Pinout & Package

Package: 20-pin plastic TSSOP (4.4 × 6.5 mm, 0.65 mm pitch), embossed tape packaging (#50 suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F11Y67ASM#50, R5F11Y68ASM#50 offers double flash/RAM for scalability without layout changes, while R5F11W67ASM#50 reduces cost by omitting RTIO and high-current I/O-making it viable only where those features are unused.

Availability

R5F11Y67ASM#50 is available at Aetrix Electronics and suitable for smart home sensor nodes, consumer appliance control panels, industrial remote I/O modules, and portable medical monitors requiring stable component supply and long-term production continuity.

Supply support for R5F11Y67ASM#50 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 specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The RL78/G1N product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated consumer and industrial control applications requiring integrated analog peripherals and flexible I/O.

FAQ

What is the maximum operating frequency and instruction execution time for the R5F11Y67ASM#50?

The R5F11Y67ASM#50 supports a maximum high-speed on-chip oscillator frequency of 20 MHz, enabling a minimum instruction execution time of 0.05 µs under 2.7–5.5 V supply conditions. At lower voltages (2.0–2.7 V), the minimum cycle time extends to 0.2 µs. The R5F11Y67ASM#50 achieves this performance using the RL78-S1 core's 3-stage pipeline architecture without external clock sources.

Does the R5F11Y67ASM#50 support hardware debugging during development?

Yes, the R5F11Y67ASM#50 includes an on-chip debug function accessible via the TOOL0 pin, enabling full emulation, breakpoint setting, and memory inspection using Renesas E2 studio and E2 Lite emulator. However, Renesas explicitly cautions against using the debug function in mass-produced units due to flash endurance limitations-production firmware should be verified and deployed without active debug circuitry enabled in the R5F11Y67ASM#50.

What are the key differences between the R5F11Y67ASM#50 and R5F11W67ASM#50?

The R5F11Y67ASM#50 belongs to the RL78/G1N group and includes P-ch open-drain outputs (up to 120 mA total sink), real-time output (RTIO) channels, and enhanced current drive for LEDs and buzzers. The R5F11W67ASM#50 is an RL78/G1M variant lacking both RTIO and P-ch open-drain capability. Both share identical 4 KB flash, 512 B RAM, 20-pin TSSOP package, and core peripherals-but the R5F11Y67ASM#50 is required for applications needing hardware-timed outputs or direct high-current drive.

Can the R5F11Y67ASM#50 operate from a single 3.3 V supply, and what are the implications for ADC accuracy?

Yes, the R5F11Y67ASM#50 operates reliably from 3.3 V (within its 2.0–5.5 V range). For the 8/10-bit ADC, the analog input voltage range is referenced to VDD, so at 3.3 V supply, full-scale conversion spans 0–3.3 V. The datasheet specifies ADC operation down to VDD = 2.4 V; at 3.3 V, typical INL is ±1 LSB and effective resolution remains ≥9.5 bits, making it suitable for precision sensor interfacing without external reference.

How does the selectable power-on-reset (SPOR) function work in the R5F11Y67ASM#50?

The R5F11Y67ASM#50 integrates a configurable SPOR circuit with four rising-edge detection thresholds: 2.25 V, 2.68 V, 3.02 V, and 4.45 V (max). Selection is controlled by option byte settings. This allows designers to align reset activation with system-level brown-out behavior-for example, choosing 2.68 V ensures reset before a 3.3 V LDO drops below regulation, preventing erratic MCU operation during power ramp-up or sag.