Renesas UPD70F3785GJ-GAE-AX

Overview

UPD70F3785GJ-GAE-AX from Renesas is a 32-bit V850ES/JG3-E single-chip microcontroller with 256 KB on-chip Flash, 64 KB RAM (including 16 KB data RAM), 100-pin LQFP package, Ethernet controller, USB function controller, 10-bit A/D converter (10 channels), and CAN interface. It targets industrial networked devices requiring real-time control and wired connectivity.

For engineers reviewing the UPD70F3785GJ-GAE-AX datasheet, UPD70F3785GJ-GAE-AX pinout, UPD70F3785GJ-GAE-AX application, or UPD70F3785GJ-GAE-AX equivalent, key selection criteria include Ethernet PHY interface support, 100-pin LQFP footprint compatibility, V850ES/JG3-E instruction set features (saturation, bit manipulation), and integrated CAN/USB/Ethernet coexistence in a single chip.

Technical Context

The UPD70F3785GJ-GAE-AX implements the V850ES/JG3-E CPU core with 32-bit barrel shifter, hardware 16×16→32 multiplier, and one-clock-pitch instruction execution at up to 50 MHz (20 ns min. instruction time). It integrates a full Ethernet MAC+PHY interface (MII/RMII), USB 2.0 function controller, and CAN 2.0B controller - all operating concurrently via a 4-channel DMA controller.

Its peripheral set includes five 16-bit timer/event counters (TAA), one 16-bit timer/event counter (TAB), four 16-bit interval timers (TMM), one 16-bit encoder timer (TMT), real-time counter (RTC), watchdog timer (WDT), and 6-bit real-time output (RTO) function - all synchronized to a unified clock domain derived from PLL or subclock sources.

Key Specifications

Pinout & Package

Package: 100-pin plastic LQFP (fine pitch, 14 × 14 mm).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit industrial microcontroller applications.

Compared with RX65N-100FBC0 and STM32H743VI, the UPD70F3785GJ-GAE-AX delivers lower system-level cost and reduced PCB area through its integrated Ethernet PHY, while maintaining deterministic real-time response via the V850ES architecture - critical for time-sensitive industrial protocols.

Availability

UPD70F3785GJ-GAE-AX is available at Aetrix Electronics and suitable for industrial Ethernet gateways, networked printer controllers, smart building HVAC units, medical imaging peripherals, and factory automation I/O modules requiring stable component supply and long-term lifecycle support.

Supply support for UPD70F3785GJ-GAE-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 is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and infrastructure markets.

The V850ES/JG3-E product line was designed for deterministic real-time control in networked industrial equipment, integrating Ethernet, CAN, USB, and precision timing peripherals into a single low-power 32-bit MCU platform.

FAQ

What is the maximum operating frequency of the UPD70F3785GJ-GAE-AX?

The UPD70F3785GJ-GAE-AX operates at up to 50 MHz using its on-chip PLL, which multiplies an external 3–6.25 MHz crystal input. This yields a minimum instruction execution time of 20 ns. The core maintains one-clock-pitch execution for most instructions, enabling predictable real-time behavior essential for industrial control loops.

Does the UPD70F3785GJ-GAE-AX include an integrated Ethernet PHY?

Yes, the UPD70F3785GJ-GAE-AX integrates a full IEEE 802.3-compliant 10/100 Mbps Ethernet PHY with MII/RMII interface support. Pins P1RXD0–P1RXD3, P1TXD0–P1TXD3, P1RXDV, P1TXEN, P1MDIO, and P1MDC provide direct connection to magnetics and RJ-45, eliminating the need for an external PHY IC.

How much Flash and RAM does the UPD70F3785GJ-GAE-AX have?

UPD70F3785GJ-GAE-AX contains 256 KB of on-chip Flash memory and 64 KB of RAM, including 16 KB of dedicated data RAM. This configuration is confirmed for the V850ES/JG3-E variant with 100-pin LQFP packaging and supports complex protocol stacks and firmware updates in resource-constrained industrial designs.

Which communication interfaces are supported by the UPD70F3785GJ-GAE-AX?

The UPD70F3785GJ-GAE-AX supports Ethernet (MAC+PHY), USB 2.0 function controller, CAN 2.0B, four asynchronous serial interfaces (UARTC), five clocked serial interfaces (CSIF), and three I²C buses. All operate concurrently via a 4-channel DMA controller, enabling simultaneous high-bandwidth data movement across multiple peripherals.

What is the package type and pin count of the UPD70F3785GJ-GAE-AX?

The UPD70F3785GJ-GAE-AX uses a 100-pin plastic LQFP (fine pitch, 14 × 14 mm) package. This matches the V850ES/JG3-E family specification and provides 62 general-purpose I/O pins (35 of which are 5 V tolerant), along with dedicated pins for Ethernet, USB, CAN, A/D, and clock sources.