Renesas DF2437FV

Overview

DF2437FV from Renesas Electronics is a 16-bit single-chip microcontroller based on the H8S/2600 CPU core, featuring 256 KB on-chip flash memory (F-ZTAT™), 16 KB RAM, and integrated peripherals including dual PWM timers (PWM/PWMX), FRT, TMR, TPU, WDT, SCI, I²C bus interface (IIC3), and 10-bit A/D converter. It operates at up to 33 MHz with 3.3 V or 5 V supply support and targets industrial control and embedded instrumentation.

For engineers reviewing the DF2437FV datasheet, DF2437FV pinout, DF2437FV application, or DF2437FV equivalent, key selection criteria include its 144-pin LQFP package, H8S/2600 instruction set compatibility with H8/300H, on-chip flash reprogrammability, and integrated analog-to-digital conversion capability for sensor interfacing in real-time control systems.

Technical Context

The DF2437FV implements the H8S/2600 CPU core with a 32-bit internal architecture, sixteen 16-bit general-purpose registers, and linear 16-Mbyte address space. Its instruction set maintains object-level upward compatibility with H8/300 and H8/300H CPUs, enabling legacy code migration.

On-chip peripherals include a 16-bit free-running timer (FRT) with input capture/compare, an 8-bit timer (TMR), a 16-bit timer pulse unit (TPU) supporting pulse-width modulation and phase counting, and a serial communication interface (SCI) with transmit/receive data register empty (TDRE) and full (RDRF) status flags managed via SSR register bits.

Key Specifications

Pinout & Package

DF2437FV is housed in a 144-pin LQFP (20 mm × 20 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined across multiple operating modes including normal, advanced, and debug modes, with dedicated pins for reset, clock input (EXTAL/XTAL), and external bus interface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DF2437FV, HD64F2437FV offers identical hardware behavior under NEC branding, while R5F2437FV provides continuity under Renesas' updated nomenclature - both preserve full pin, code, and peripheral compatibility without layout or firmware changes.

Availability

DF2437FV is available at Aetrix Electronics and suitable for industrial PLC I/O modules, motor drive controllers, energy metering terminals, and factory automation sensor hubs requiring stable component supply and long-lifecycle support.

Supply support for DF2437FV 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 leader formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions for industrial and automotive markets.

The H8S/2437 Group was designed as a high-performance, cost-optimized 16-bit MCU platform for real-time embedded control applications requiring integrated analog interfaces, deterministic timing, and field-upgradable flash memory.

FAQ

What is the maximum operating frequency of the DF2437FV?

The DF2437FV supports a maximum system clock frequency of 33 MHz. This is achieved using an external crystal (up to 20 MHz) with internal PLL multiplication or direct external clock input. The H8S/2600 CPU core sustains this speed with zero-wait-state access to on-chip F-ZTAT™ flash memory, enabling consistent instruction throughput for time-critical control loops in applications such as motor drives and PLCs where the DF2437FV serves as the primary real-time controller.

Does the DF2437FV support in-system programming of its flash memory?

Yes, the DF2437FV supports in-system programming (ISP) of its 256 KB on-chip flash memory via the on-chip debug interface (OCDS) or serial programming mode using the SCI peripheral. This allows firmware updates without removing the device from the target board. The DF2437FV's F-ZTAT™ flash architecture enables byte- and word-level writes with built-in erase verification, making it suitable for field-upgradable industrial equipment where the DF2437FV manages critical control logic and calibration data.

What are the power supply requirements for the DF2437FV?

The DF2437FV operates from two independent supply domains: VCC1/VSS1 for the core logic (3.3 V ±0.3 V) and VCC2/VSS2 for I/O ports (3.3 V ±0.3 V or 5.0 V ±10 %). This dual-voltage design allows mixed-signal interfacing while maintaining low-power core operation. The DF2437FV includes internal voltage regulators and power-on reset circuitry, ensuring robust startup behavior across both supply configurations - essential for reliable deployment of the DF2437FV in industrial environments with varying bus voltage tolerances.

How many analog input channels does the DF2437FV's A/D converter support?

The DF2437FV integrates a 10-bit successive-approximation A/D converter with 8 analog input channels (AN0–AN7), each selectable via software-controlled channel register. It supports programmable sample-and-hold timing, continuous scan mode, and external trigger inputs for synchronized acquisition. In sensor-rich applications like factory automation hubs, the DF2437FV uses these 8 channels to concurrently monitor temperature, pressure, and current signals without external multiplexers - reducing bill-of-materials cost and board space while preserving timing accuracy.

Is the DF2437FV pin-compatible with other members of the H8S/2437 Group?

Yes, the DF2437FV shares identical pin assignment, package (144-pin LQFP), and peripheral register mapping with all variants in the H8S/2437 Group, including HD64F2437FV and R5F2437FV. Differences between variants are limited to mask ROM vs. flash memory configuration and minor electrical specifications - not pin function or layout. This ensures drop-in compatibility across the group, allowing designers to migrate firmware and hardware designs seamlessly when selecting the DF2437FV for new projects or replacing legacy stock.