Renesas DF2128FA20V

Overview

DF2128FA20V from Renesas Electronics is a 32-bit H8S/2000 CPU-based microcontroller with on-chip F-ZTAT™ flash memory (512 KB), 32 KB RAM, and integrated peripherals including dual SCI, dual I²C (optional), 16-bit FRT, four 8-bit TMRs, two 14-bit PWMX timers, eight-channel 10-bit ADC, and DTC for CPU-free data transfer - designed for PC monitor control and embedded system management.

For engineers reviewing the DF2128FA20V datasheet, DF2128FA20V pinout, DF2128FA20V application, or DF2128FA20V equivalent, key selection criteria include its 20 MHz max operating frequency, 100-pin QFP package, dual watchdog timers, I²C bus interface option, and F-ZTAT flash enabling field-programmable firmware updates without external programming hardware.

Technical Context

The DF2128FA20V implements the H8S/2000 CPU core with 16 internal 16-bit general-purpose registers in 32-bit configuration, executing basic instructions in one state and supporting a 16-Mbyte linear address space. It integrates a data transfer controller (DTC) that enables autonomous memory-to-peripheral transfers without CPU intervention.

Its peripheral set includes two serial communication interfaces (SCI) with asynchronous and clock-synchronous modes, two I²C bus interfaces (available as factory option), and timer connection capability allowing cascaded or synchronized timing operations across multiple on-chip timers - critical for precise display timing and power sequencing in monitor applications.

Key Specifications

Pinout & Package

DF2128FA20V is housed in a 100-pin plastic quad flat package (QFP) with 0.5 mm pitch, designed for surface-mount assembly and thermal dissipation in compact monitor control boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DF2128FA20V, R5F21285SNFP offers reduced memory and peripheral flexibility, while HD64F2128FV trades field-upgradability for lower unit cost and guaranteed code integrity - making DF2128FA20V optimal for applications requiring both capacity and adaptability.

Availability

DF2128FA20V is available at Aetrix Electronics and suitable for PC monitor control units, industrial display management systems, and digital signage controllers requiring stable component supply, long-term lifecycle support, and field-programmable firmware capability.

Supply support for DF2128FA20V 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 automotive, industrial, and consumer markets.

The H8S/2128 Series was developed specifically for display subsystem control - integrating timing-critical peripherals, flash flexibility, and robust I/O to replace discrete logic in PC monitors and embedded displays.

FAQ

What is the maximum operating frequency of the DF2128FA20V?

The DF2128FA20V operates at a maximum frequency of 20 MHz when supplied with a 5 V VCC and using an external crystal oscillator connected to XTAL/EXTAL pins. This frequency determines instruction throughput and real-time peripheral response - for example, the 16-bit free-running timer (FRT) achieves 50 ns resolution at this clock rate. The DF2128FA20V does not include an internal RC oscillator; system clock must be provided externally or via crystal.

Does the DF2128FA20V support in-system programming of its flash memory?

Yes, the DF2128FA20V features F-ZTAT™ flash memory that supports full in-system programming (ISP) via its built-in boot ROM and SCI interface - no external programmer is needed. Firmware updates can be performed using standard UART commands sent to DF2128FA20V's SCI0 port, with checksum verification and sector-erase control handled internally. This capability is essential for remote monitor calibration and feature upgrades in deployed DF2128FA20V-based systems.

How many I²C interfaces does the DF2128FA20V include, and are they standard or optional?

The DF2128FA20V includes two I²C bus interfaces (IIC0 and IIC1), implemented as a factory-configurable option - meaning the specific DF2128FA20V unit may or may not have them enabled depending on ordering code and wafer mask configuration. When present, each supports standard-mode (100 kbps) and fast-mode (400 kbps), 7-bit addressing, and multi-master arbitration. Confirm I²C presence via the device's option byte or Renesas' part-specific datasheet before designing I²C-dependent circuits for DF2128FA20V.

What is the role of the Data Transfer Controller (DTC) in the DF2128FA20V?

The Data Transfer Controller (DTC) in the DF2128FA20V is a dedicated hardware DMA engine that performs memory-to-peripheral and peripheral-to-memory transfers without CPU involvement. It supports up to 64 transfer descriptors, auto-reload, and interrupt-on-transfer-complete - enabling continuous ADC data streaming to RAM or SCI transmission buffers while the CPU executes application code. In DF2128FA20V-based monitor controllers, the DTC reduces CPU load by >40% during active display data handling.

Can the DF2128FA20V operate with a single 5 V supply, and what are its power domain requirements?

Yes, the DF2128FA20V operates from a single 5 V ±10% supply applied to both VCC and AVCC pins; it does not require separate analog/digital rails. All I/O pins are 5 V-tolerant, and internal regulators provide stable core voltage. However, Renesas specifies strict decoupling: minimum 100 nF ceramic capacitor per VCC–VSS pair, plus bulk capacitance near the 100-pin QFP package. Power sequencing is not required, but RESET must be held low for ≥100 ms after VCC stabilizes to ensure reliable DF2128FA20V initialization.