Renesas UPD70F3842GC-UEU-AX

Overview

UPD70F3842GC-UEU-AX from Renesas Electronics is a 32-bit V850ES/JG3-L microcontroller with integrated USB 2.0 full-speed controller, 512 KB on-chip Flash memory, 64 KB RAM, and 100-pin LQFP package. It operates at up to 40 MHz, supports single-cycle instruction execution, and targets embedded control applications requiring real-time USB device connectivity, such as industrial gateways and diagnostic tools.

For engineers reviewing the UPD70F3842GC-UEU-AX datasheet, UPD70F3842GC-UEU-AX pinout, UPD70F3842GC-UEU-AX application, or UPD70F3842GC-UEU-AX equivalent, key selection criteria include USB controller integration, Flash/RAM size, operating voltage range (2.7–3.6 V), and support for on-chip debug via JTAG/ICD interfaces.

Technical Context

The UPD70F3842GC-UEU-AX implements the V850ES CPU core with 32-bit RISC architecture, five-stage pipeline, and hardware multiplier/divider. It integrates a dedicated USB 2.0 full-speed controller compliant with USB Specification Rev. 2.0, supporting control, bulk, interrupt, and isochronous transfers without external PHY.

On-chip peripherals include three 16-bit timer/event counters (TMP), one 32-bit watchdog timer (WDT), 12-channel 10-bit ADC, UART, I²C, and 100-MHz-capable GPIO with programmable drive strength and hysteresis. Clock generation supports main oscillator (1–20 MHz), subclock (32.768 kHz), and PLL-based system clock up to 40 MHz.

Key Specifications

Pinout & Package

UPD70F3842GC-UEU-AX is housed in a 100-pin LQFP package with exposed thermal pad (EP). Pin functions are defined per Renesas Hardware User's Manual Rev.4.00, including dedicated USB D+ and D− pins (P90/P91), JTAG debug interface (TCK/TMS/TDI/TDO/TRST), and multiplexed peripheral signals across Ports 0–9 and CM/CT/DH/DL.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F566TEADFP and STM32F072RBT6, the UPD70F3842GC-UEU-AX offers balanced USB integration, larger on-chip memory, and mature V850 toolchain support - ideal for industrial USB device designs where transceiver elimination and deterministic real-time behavior are prioritized over raw CPU speed or ARM ecosystem alignment.

Availability

UPD70F3842GC-UEU-AX is available at Aetrix Electronics and suitable for industrial USB device development, embedded diagnostic tools, and automated test equipment requiring stable component supply and long-term lifecycle assurance.

Supply support for UPD70F3842GC-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The UPD70F3842GC-UEU-AX belongs to the V850ES/JG3-L family, designed specifically for embedded USB device applications demanding high reliability, low-latency real-time control, and minimal external component count.

FAQ

What is the maximum operating frequency of the UPD70F3842GC-UEU-AX?

The UPD70F3842GC-UEU-AX operates at a maximum system clock frequency of 40 MHz. This is achieved using the on-chip PLL with an external main clock oscillator (1–20 MHz). At this speed, the V850ES core executes most instructions in a single cycle, enabling deterministic real-time response for USB transaction handling and control tasks. The UPD70F3842GC-UEU-AX maintains timing compliance across its specified voltage range (2.7–3.6 V) and industrial temperature range (−40°C to +85°C).

Does the UPD70F3842GC-UEU-AX include an integrated USB physical layer (PHY)?

Yes, the UPD70F3842GC-UEU-AX integrates a full-speed USB 2.0 transceiver (PHY) alongside its USB controller logic. Pins P90 (USB_D+) and P91 (USB_D−) connect directly to the USB connector with only passive termination required (1.5 kΩ pull-up on D+ for device mode). No external USB PHY chip is needed, reducing BOM cost and PCB area. The UPD70F3842GC-UEU-AX supports all four USB transfer types - control, bulk, interrupt, and isochronous - in device mode.

What debug interfaces are supported by the UPD70F3842GC-UEU-AX?

The UPD70F3842GC-UEU-AX supports on-chip debugging via the JTAG interface using pins TCK, TMS, TDI, TDO, and TRST (mapped to Port 7). It is compatible with Renesas E2 emulator and third-party JTAG debuggers. The UPD70F3842GC-UEU-AX also supports single-wire debug (SWD) through the same JTAG pins in reduced-pin mode. Flash programming and real-time trace are enabled without requiring additional debug headers or dedicated SWD pins.

Is the UPD70F3842GC-UEU-AX qualified for automotive applications?

No, the UPD70F3842GC-UEU-AX is rated as a "Standard" quality grade device per Renesas classification and is intended for industrial, office, and consumer applications - not automotive or safety-critical systems. Its qualification covers operating temperatures from −40°C to +85°C and meets industrial reliability standards, but it does not carry AEC-Q100 certification or "High Quality" grade designation required for transportation equipment. For automotive use, Renesas recommends its RH850 or RL78/F1x families instead of the UPD70F3842GC-UEU-AX.

What is the Flash memory endurance and data retention specification for the UPD70F3842GC-UEU-AX?

The UPD70F3842GC-UEU-AX uses SuperFlash® technology licensed from Silicon Storage Technology, providing guaranteed endurance of 100,000 write/erase cycles and data retention of 20 years at +85°C. These specifications apply to the full 512 KB on-chip Flash memory and are validated across the industrial temperature range. Firmware updates and field reprogramming of the UPD70F3842GC-UEU-AX are supported without degradation under typical usage profiles.