Renesas UPD70F3840GB(R)-GAH-AX

Overview

UPD70F3840GB(R)-GAH-AX from Renesas Electronics is a 32-bit V850ES/JG3-L microcontroller with on-chip USB 2.0 controller, 512 KB Flash memory, and 64 KB RAM, operating at up to 40 MHz. It integrates UART, I²C, SPI, 16-bit timers, and ADC for embedded control in industrial automation and USB-connected peripherals.

For engineers reviewing the UPD70F3840GB(R)-GAH-AX datasheet, UPD70F3840GB(R)-GAH-AX pinout, UPD70F3840GB(R)-GAH-AX application, or UPD70F3840GB(R)-GAH-AX equivalent, key selection criteria include USB controller integration, Flash endurance (100K write/erase cycles), 10-bit 16-channel ADC resolution, and support for single-cycle instruction execution in V850ES architecture.

Technical Context

The UPD70F3840GB(R)-GAH-AX implements the V850ES CPU core with five-stage pipeline, supporting both little-endian and big-endian data access. It features an on-chip PLL for clock multiplication from 1–20 MHz external crystal input to internal 40 MHz system clock.

Its USB controller complies with USB 2.0 Full-Speed (12 Mbps) specification and supports control, interrupt, bulk, and isochronous transfer types. The device includes dedicated USB PHY, transceiver, and endpoint FIFOs - all managed without external components.

Key Specifications

Pinout & Package

UPD70F3840GB(R)-GAH-AX is housed in a 144-pin LQFP package (20 mm × 20 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions include dedicated USB_DP/USB_DM differential pair, 16 general-purpose I/O ports (P0–P9, PC, CT, DH, DL), reset (DRST), clock inputs (XIN/XOUT, SUBXIN/SUBXOUT), and power domains (VDD, VSS, AVDD, AVSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R7F0C004M2DFB, UPD70F3840GB(R)-GAH-AX delivers higher throughput and lower system-level BOM cost via integrated USB PHY; compared with UPD70F3796GC-UEU-AX, it provides double Flash/RAM capacity for complex USB class drivers and multi-sensor fusion firmware.

Availability

UPD70F3840GB(R)-GAH-AX is available at Aetrix Electronics and suitable for industrial automation gateways, PLC I/O modules, medical diagnostic peripherals, and test & measurement equipment requiring stable component supply across long production lifecycles.

Supply support for UPD70F3840GB(R)-GAH-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 enterprise applications.

The V850ES/JG3-L product line was designed for high-reliability embedded systems requiring integrated USB connectivity, deterministic real-time performance, and long-term supply stability in industrial and medical equipment.

FAQ

What USB speed and device classes does the UPD70F3840GB(R)-GAH-AX support?

The UPD70F3840GB(R)-GAH-AX integrates a full-speed USB 2.0 controller compliant with USB Specification Revision 2.0, supporting up to 12 Mbps. It natively implements control, interrupt, bulk, and isochronous transfer types - enabling CDC, HID, MSC, and custom class implementations without external PHY. The UPD70F3840GB(R)-GAH-AX USB engine includes 512-byte endpoint FIFOs and descriptor-based enumeration logic.

Does the UPD70F3840GB(R)-GAH-AX require an external crystal for USB operation?

Yes - the UPD70F3840GB(R)-GAH-AX requires a 12 MHz ±0.25% fundamental-mode crystal connected to XIN/XOUT pins for accurate USB timing. The on-chip PLL locks to this reference to generate the 48 MHz USB clock and 40 MHz system clock. Using an inaccurate or unstable crystal may cause USB enumeration failure or packet corruption. The UPD70F3840GB(R)-GAH-AX does not support USB operation from internal RC oscillators.

What is the Flash endurance and data retention specification for the UPD70F3840GB(R)-GAH-AX?

The UPD70F3840GB(R)-GAH-AX uses SuperFlash® technology with guaranteed 100,000 write/erase cycles per sector and 20-year data retention at 85°C. Each Flash sector can be erased independently, enabling robust firmware update schemes with dual-bank or A/B swapping. The UPD70F3840GB(R)-GAH-AX supports secure boot and Flash lock bits to prevent unauthorized code reads or modifications.

How is analog and digital power isolation implemented on the UPD70F3840GB(R)-GAH-AX?

The UPD70F3840GB(R)-GAH-AX separates analog and digital domains using dedicated AVDD/AVSS pins physically isolated from VDD/VSS. Internal voltage regulators and noise-suppression circuitry isolate the ADC and USB PHY analog sections. Designers must use separate PCB planes, ferrite beads, and 10 µF + 0.1 µF decoupling on AVDD, and route AVSS directly to analog ground plane - as specified in Renesas Hardware User's Manual Rev.4.00. This isolation is critical for achieving ±1 LSB INL in the 10-bit ADC and stable USB signal integrity.

Can the UPD70F3840GB(R)-GAH-AX operate in low-power modes while maintaining USB suspend/resume capability?

Yes - the UPD70F3840GB(R)-GAH-AX supports USB-aware low-power modes. In STOP mode, the CPU and most peripherals halt while the USB controller remains active and monitors bus resume signaling. Upon detection of a resume event, it wakes the CPU within 10 µs. The UPD70F3840GB(R)-GAH-AX meets USB 2.0 suspend current requirements (<500 µA) and supports remote wakeup via USB control transfers - essential for energy-efficient peripheral designs.