Renesas UPD70F3746GJ-GAE-AX

Overview

UPD70F3746GJ-GAE-AX from Renesas Electronics is a 32-bit V850ES/JG3 microcontroller with 512 KB on-chip Flash, 48 KB RAM, and integrated 16-bit timers (TMP/TMQ), UART, I²C, and CAN 2.0B controller. It operates at up to 32 MHz, supports single-cycle instruction execution for critical real-time tasks, and targets automotive body electronics and industrial control systems requiring deterministic timing and functional safety support.

For engineers reviewing the UPD70F3746GJ-GAE-AX datasheet, UPD70F3746GJ-GAE-AX pinout, UPD70F3746GJ-GAE-AX application, or UPD70F3746GJ-GAE-AX equivalent, key selection criteria include its CAN 2.0B interface compliance, 32 MHz max CPU clock, 512 KB Flash with ECC, 48 KB SRAM, and support for ISO 11898-1 physical layer signaling in automotive network nodes.

Technical Context

The UPD70F3746GJ-GAE-AX implements the V850ES core with 3-stage pipeline, 16-bit fixed-length instructions, and memory-mapped peripheral registers. It integrates a dedicated CAN controller supporting both standard and extended frames, programmable baud rates up to 1 Mbps, and automatic retransmission with error confinement.

Its clock system includes an on-chip PLL supporting 1–32 MHz operation from external crystal or ceramic resonator, plus independent clock domains for CPU, peripherals, and CAN bus. The device uses a 100-pin LQFP package with dedicated CANH/CANL pins routed to internal differential transceivers meeting ISO 11898-2 electrical requirements.

Key Specifications

Pinout & Package

UPD70F3746GJ-GAE-AX is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad for enhanced heat dissipation in automotive under-hood environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD70F3746GJ-GAE-AX, R5F572NNDSP#V0 offers Arm-based toolchain continuity and hardware FPU but lacks native V850 binary compatibility; UPD70F3739GJ-GAE-AX shares identical pinout and peripheral set except CAN, enabling reuse of PCB layout where networking is removed.

Availability

UPD70F3746GJ-GAE-AX is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and CAN-based building automation systems requiring stable component supply across multi-year production cycles.

Supply support for UPD70F3746GJ-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 Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for automotive, industrial, and IoT markets.

The UPD70F3746GJ-GAE-AX belongs to the V850ES/JG3 product line, designed specifically for cost-sensitive automotive body electronics requiring CAN connectivity, functional safety readiness, and long-term supply stability.

FAQ

What is the maximum operating frequency of the UPD70F3746GJ-GAE-AX?

The UPD70F3746GJ-GAE-AX operates at a maximum CPU clock frequency of 32 MHz. This is achieved using the on-chip PLL to multiply an external crystal or resonator input (1–20 MHz). At 32 MHz, the V850ES core delivers a 31.25 ns instruction cycle time, enabling deterministic real-time response for automotive control loops. The device maintains this frequency across its full operating voltage range of 3.0 V to 5.5 V.

Does the UPD70F3746GJ-GAE-AX include an integrated CAN transceiver?

No, the UPD70F3746GJ-GAE-AX integrates a CAN 2.0B protocol controller but not a physical-layer transceiver. It provides dedicated CANH and CANL pins that require connection to an external ISO 11898-2 compliant transceiver (e.g., TJA1042 or SN65HVD230) to drive the differential bus. This separation allows design flexibility in selecting transceivers optimized for specific EMI immunity, wake-up sensitivity, or fault protection requirements.

What memory protection features does the UPD70F3746GJ-GAE-AX offer?

The UPD70F3746GJ-GAE-AX includes ECC (Error Correction Code) protection for its 512 KB on-chip Flash memory, capable of correcting single-bit errors and detecting double-bit errors. It also supports memory protection units (MPU) through system register configuration, allowing segmentation of code, data, and peripheral address spaces with read/write/execute permissions. These features enhance reliability in automotive environments where radiation-induced bit flips or voltage transients could corrupt firmware or runtime data.

Is the UPD70F3746GJ-GAE-AX qualified for automotive applications?

Yes, the UPD70F3746GJ-GAE-AX is manufactured to Renesas' "High Quality" grade and is qualified for automotive applications including body electronics, chassis subsystems, and infotainment interfaces. It meets AEC-Q100 Grade 2 requirements (−40°C to +105°C ambient temperature), supports fail-safe reset behavior, and includes built-in self-test (BIST) capabilities for Flash and RAM. Its CAN 2.0B controller and 3.0–5.5 V operation align with ISO 11898 and automotive electrical system specifications.

What development tools support the UPD70F3746GJ-GAE-AX?

The UPD70F3746GJ-GAE-AX is supported by Renesas' legacy V850 toolchain, including the CA850 C compiler, PM+ project manager, and ID850QB integrated debugger. Hardware debug interfaces include QB-V850MINI and QB-MINI2 on-chip debug emulators. Renesas also provides the V850ES/JG3 Hardware User's Manual (Rev. 3.00) and Architecture Manual for complete register-level documentation. No official support exists for modern IDEs like e2 studio or CS+ for this legacy V850 part.