Renesas UPD70F3841GC-UEU-AX

Overview

UPD70F3841GC-UEU-AX from Renesas Electronics is a 32-bit V850ES/JG3-L microcontroller with on-chip USB 2.0 full-speed controller, 512 KB Flash memory, and 64 KB RAM. It operates at up to 40 MHz, supports 5V I/O tolerance, and targets embedded control in industrial automation and USB-connected peripherals.

For engineers reviewing the UPD70F3841GC-UEU-AX datasheet, UPD70F3841GC-UEU-AX pinout, UPD70F3841GC-UEU-AX application, or UPD70F3841GC-UEU-AX equivalent, key selection criteria include USB controller integration, Flash endurance (100K write/erase cycles), operating voltage range (2.7–5.5 V), and industrial-grade temperature support (−40°C to +85°C).

Technical Context

The UPD70F3841GC-UEU-AX implements the V850ES CPU core with 5-stage pipeline, supporting Thumb-compatible instruction set extensions and hardware multiply/divide. It integrates a USB 2.0 full-speed controller compliant with USB Specification Rev. 2.0, including endpoint buffers, serial interface engine (SIE), and USB PHY.

On-chip peripherals include 16-bit timer/event counters (TMP), watchdog timer (WDT), UART (SCI), I²C-compatible serial interface (RIIC), and 10-bit ADC with 16 channels. Clock generation includes PLL for internal high-frequency operation and dual oscillators (main and subclock) for real-time clock and low-power modes.

Key Specifications

Pinout & Package

UPD70F3841GC-UEU-AX is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions include dedicated USB D+/D− lines, multiple SCI/RIIC channels, 16-channel 10-bit ADC inputs, and programmable I/O with pull-up/pull-down control.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller-with-integrated-USB applications.

Compared with UPD70F3841GC-UEU-AX, R5F566TEADFP offers higher clock speed and enhanced DSP capabilities but lacks 5V I/O tolerance, while UPD70F3378GC-UEU-AX provides pin-for-pin compatibility with reduced memory-making it suitable for scaled-down firmware deployments without hardware redesign.

Availability

UPD70F3841GC-UEU-AX is available at Aetrix Electronics and suitable for industrial automation gateways, USB-connected sensor nodes, and embedded test equipment requiring stable component supply across extended production lifecycles.

Supply support for UPD70F3841GC-UEU-AX 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 manufacturer headquartered in Japan, specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The UPD70F3841GC-UEU-AX belongs to the V850ES/JG3-L microcontroller family, designed specifically for cost-effective, USB-enabled embedded control in industrial and consumer equipment where reliability, integrated peripherals, and long-term supply stability are critical.

FAQ

What USB device classes does the UPD70F3841GC-UEU-AX natively support?

The UPD70F3841GC-UEU-AX includes a hardware USB 2.0 full-speed controller that supports standard device classes including HID, CDC ACM (virtual COM port), and MSC (mass storage) through firmware implementation. Its endpoint buffer architecture and descriptor-handling registers enable flexible class configuration, though class-specific firmware must be developed or licensed separately. The UPD70F3841GC-UEU-AX itself does not embed pre-certified class stacks.

Does the UPD70F3841GC-UEU-AX require an external crystal for USB operation?

Yes-the UPD70F3841GC-UEU-AX requires a 12 MHz ±0.25% crystal connected to XT1/XT2 for accurate USB frame timing. The internal PLL locks to this reference to generate the 48 MHz USB clock. Using a lower-precision resonator or RC oscillator violates USB specification timing tolerances and will cause enumeration failure or data corruption during transfers.

What is the maximum allowed operating junction temperature for UPD70F3841GC-UEU-AX?

The UPD70F3841GC-UEU-AX has a maximum junction temperature (T_J) rating of +125°C, consistent with its industrial −40°C to +85°C ambient operating range. Thermal design must ensure junction temperature remains below this limit under worst-case power dissipation (e.g., 40 MHz operation with all peripherals active). The UPD70F3841GC-UEU-AX includes thermal shutdown detection in its on-chip reset circuitry.

Can UPD70F3841GC-UEU-AX operate from a 3.3 V supply while maintaining 5V-tolerant I/O?

Yes-the UPD70F3841GC-UEU-AX supports 3.3 V core and I/O operation (VDD = 3.3 V) while retaining 5V-tolerant inputs on all general-purpose pins except USB_DP/DM and analog inputs. This allows direct interfacing with 5V logic signals without external level shifters, simplifying integration into mixed-voltage systems. Output drive strength remains specified at 20 mA sink/source under these conditions.

Is there on-chip debug support for UPD70F3841GC-UEU-AX, and what tools are compatible?

Yes-the UPD70F3841GC-UEU-AX supports on-chip debugging via the JTAG interface using Renesas E2 emulator or compatible third-party tools such as Segger J-Link. Debug features include hardware breakpoints, real-time trace, and memory/register inspection. The UPD70F3841GC-UEU-AX also supports single-wire debug (SWD) mode for reduced pin count, and its flash programming is supported by PG-FP5 and Renesas Flash Programmer software.