Renesas DF2145BFA20IV

Overview

DF2145BFA20IV from Renesas Electronics is a 16-bit H8S/2145B microcontroller featuring a 32-bit internal architecture, 256 KB on-chip Flash ROM (F-ZTAT™), 8 KB RAM, and integrated peripherals including 10-bit ADC, 8-bit DAC, SCI, I²C, PWM timers (8-bit and 14-bit), FRT, WDT, DTC, and X-bus/LPC host interfaces - deployed in industrial control and embedded instrumentation systems.

For engineers reviewing the DF2145BFA20IV datasheet, DF2145BFA20IV pinout, DF2145BFA20IV application, or DF2145BFA20IV equivalent, key selection criteria include its 256 KB reprogrammable Flash memory, 8 KB RAM, 100-pin LQFP package with X-bus interface support, and qualification for Standard-grade applications including office equipment and test & measurement instruments.

Technical Context

The DF2145BFA20IV implements the H8S/2000 CPU core with sixteen 16-bit general-purpose registers and a 16-Mbyte linear address space. It executes instructions at up to 20 MHz (max) with bus clock derived from internal PLL or external crystal.

Its peripheral set includes dual PWM modules (8-bit PWM and 14-bit PWMX), a 16-bit free-running timer (FRT), 8-bit timer (TMR), watchdog timer (WDT), serial communication interface (SCI), I²C bus interface, keyboard buffer controller, and high-functionality bus controller supporting DRAM interfacing via X-bus - all accessible through dedicated on-chip registers and interrupt vectors.

Key Specifications

Pinout & Package

DF2145BFA20IV is housed in a 100-pin LQFP (14.0 mm × 14.0 mm, 0.5 mm pitch) package. Pin functions are defined across multiple operating modes (single-chip, expanded bus, etc.), with dedicated pins for X-bus control (e.g., AS#, CS#, RD#, WR#), I/O ports (P0–P11), analog inputs (AD0–AD7), DAC output (DA0), and clock/reset signals (CLK, RESET#).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F2140BV and HD64F2141BV, DF2145BFA20IV delivers double the RAM (8 KB), 4× Flash capacity (256 KB), integrated DAC output, and enhanced PWM resolution - making it optimal for applications requiring local analog actuation, complex data buffering, or field-upgradable firmware.

Availability

DF2145BFA20IV is available at Aetrix Electronics and suitable for industrial PLC I/O modules, test & measurement front-ends, office equipment motor control, and embedded data loggers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for DF2145BFA20IV 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 specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and consumer markets.

The H8S/2145B belongs to the H8S/2140B Group - a family of 16-bit MCUs designed for cost-sensitive, performance-balanced embedded applications requiring integrated analog, communication, and memory resources without automotive or safety certification overhead.

FAQ

What is the maximum operating frequency of the DF2145BFA20IV?

The DF2145BFA20IV supports a maximum system clock frequency of 20 MHz. Its internal PLL allows multiplication of lower-frequency external crystals (e.g., 4 MHz or 8 MHz) to achieve this bus speed. The actual achievable frequency depends on supply voltage stability, PCB layout, and thermal conditions - full 20 MHz operation requires VCC = 4.5–5.5 V and ambient temperature ≤85°C per Renesas Electrical Characteristics specifications.

Does the DF2145BFA20IV support the LPC interface?

No, the DF2145BFA20IV does not support the LPC interface. According to the H8S/2140B Group Hardware Manual Rev. 3.00, the LPC function and associated pins (e.g., P83/LPCPD, P82/CLKRUN, P80/PME) are explicitly excluded from the H8S/2145B variant - including DF2145BFA20IV. Only X-bus host interface functionality is available for external memory expansion.

What analog peripherals are integrated into the DF2145BFA20IV?

The DF2145BFA20IV integrates an 8-channel 10-bit successive-approximation ADC and a single-channel 8-bit voltage-output DAC. The ADC supports software/start-triggered conversion with configurable sample-and-hold timing; the DAC provides rail-to-rail output referenced to AVCC/AVSS and is accessible via the DA0 pin. No external reference or op-amp is required for basic operation.

Is the DF2145BFA20IV pin-compatible with other H8S/2140B Group devices?

Yes, the DF2145BFA20IV shares the same 100-pin LQFP package and pinout with other members of the H8S/2140B Group, including HD64F2140BV and HD64F2141BV. However, functional differences exist: DF2145BFA20IV enables DAC output (DA0) and 14-bit PWMX, while some pins reserved on smaller variants (e.g., P107–P100 for AD0–AD7) are fully implemented here per the pin configuration table in Section 5.1 of the Hardware Manual.

What quality grade is assigned to the DF2145BFA20IV?

The DF2145BFA20IV is classified as a "Standard" quality grade device per Renesas documentation. It is intended for applications including computers, office equipment, communications equipment, test and measurement instruments, audio/video gear, home appliances, machine tools, personal electronics, and industrial robots - but not for transportation, medical life-support, aerospace, or nuclear systems without explicit written consent from Renesas Electronics.