Renesas R5F100GJGNA#20

Overview

R5F100GJGNA#20 from Renesas is a 48-pin, 256 KB flash, 8 KB data flash, 20 KB RAM RL78/G13 16-bit microcontroller with ultra-low-power operation (66 μA/MHz active, 0.57 μA RTC+LVD), 1.6–5.5 V supply, and integrated peripherals including 16-bit timers, 10-bit ADC (26 channels), UART/LIN, I²C, CSI, and real-time clock. It targets battery-powered industrial sensors and smart metering endpoints.

For engineers reviewing the R5F100GJGNA#20 datasheet, R5F100GJGNA#20 pinout, R5F100GJGNA#20 application, or R5F100GJGNA#20 equivalent, key selection criteria include its HWQFN-48 package with 0.5-mm pitch, -40°C to +105°C industrial temperature grade (G suffix), on-chip debug support, and background data flash rewriting capability for firmware updates in field-deployed devices.

Technical Context

The R5F100GJGNA#20 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting instruction execution times from 0.03125 μs (32 MHz high-speed mode) to 30.5 μs (32.768 kHz ultra-low-speed mode). Its memory subsystem includes 256 KB code flash with 1 KB block erase, 8 KB data flash with 1M-cycle endurance, and 20 KB SRAM - all accessible via unified 1 MB address space.

Peripherals are tightly coupled to low-power operation: DMA controller (4 channels), 16-bit timer array (12 channels), 10-bit ADC with internal 1.45 V reference and temperature sensor, and dual UART/LIN interfaces with automatic baud rate detection. The device supports SNOOZE mode for interrupt-driven wake-up without full CPU restart.

Key Specifications

Pinout & Package

Package: HWQFN-48 (7 mm × 7 mm, 0.5 mm pitch, exposed thermal pad), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F100GJGNA#20, R5F101GJGNA#20 removes data flash but retains identical low-power behavior and peripheral set - ideal for cost-sensitive fixed-function designs; RA2A1EKB20FBC0 offers greater processing headroom at the expense of increased active current and loss of seamless in-field data updates.

Availability

R5F100GJGNA#20 is available at Aetrix Electronics and suitable for smart metering, industrial IoT edge nodes, home appliance control, and building automation systems requiring stable component supply across long product lifecycles.

Supply support for R5F100GJGNA#20 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, power, and SoC solutions for automotive, industrial, and enterprise markets.

The RL78/G13 family delivers true low-power performance for general-purpose embedded applications, targeting cost-sensitive, battery-operated, and thermally constrained industrial control systems.

FAQ

What is the maximum operating frequency and corresponding power consumption of the R5F100GJGNA#20?

The R5F100GJGNA#20 operates up to 32 MHz using its high-accuracy on-chip oscillator (±1.0% over -40°C to +85°C). At this speed, active current is 66 μA/MHz - meaning ~2.1 mA total at 32 MHz with typical peripheral enablement. In STOP mode with RTC and LVD active, it draws just 0.57 μA, enabling decade-long battery operation in intermittent-sensing applications.

Does the R5F100GJGNA#20 support in-system programming and secure firmware updates?

Yes, the R5F100GJGNA#20 supports full in-system programming via on-chip debug (SWD/JTAG) and self-programming of both code and data flash. It includes flash shield window protection and block erase prohibition to prevent unauthorized modification. Background operation (BGO) allows code execution from flash while rewriting data flash - essential for secure, zero-downtime firmware updates in deployed R5F100GJGNA#20 units.

What are the analog capabilities of the R5F100GJGNA#20, and how is the internal temperature sensor calibrated?

The R5F100GJGNA#20 integrates a 10-bit ADC with up to 26 analog input channels, selectable internal 1.45 V reference, and an on-die temperature sensor. The temperature sensor output is factory-calibrated and accessible via dedicated ADC channel ANI25; its linear response (typically -55°C to +125°C) requires only single-point offset compensation in most applications - no external calibration needed for R5F100GJGNA#20-based thermal monitoring.

Can the R5F100GJGNA#20 interface directly with 1.8 V or 2.5 V logic without level shifters?

Yes, the R5F100GJGNA#20 supports different-potential interface: selected I/O ports (P0x, P1x, P2x) can be configured with TTL input buffers and withstand voltages compatible with 1.8 V, 2.5 V, and 3.3 V systems. When powered from 3.3 V VDD, these pins accept 1.8 V logic-high signals safely - eliminating external level translators in mixed-voltage R5F100GJGNA#20 designs.

What packaging and thermal characteristics define the R5F100GJGNA#20's suitability for compact industrial PCBs?

The R5F100GJGNA#20 uses a 7 mm × 7 mm HWQFN-48 package with 0.5 mm pitch and exposed thermal pad - optimized for high-density layouts and efficient heat transfer. Its θ_JA is 42°C/W (JEDEC standard), enabling reliable operation at full 32 MHz in ambient temperatures up to +105°C when using two internal layers and 2 cm² copper pour. This makes the R5F100GJGNA#20 well-suited for space-constrained industrial controllers where thermal margin is critical.