Renesas DF2138RFA20JV

Overview

DF2138RFA20JV from Renesas Electronics is a 16-bit single-chip microcomputer in the H8S/2138 Group, featuring a 32-bit H8S/2000 CPU core, 128 KB on-chip flash memory (F-ZTAT™), and integrated peripherals including dual 14-bit PWM timers (PWMX), 8-channel 10-bit ADC, dual D/A converters, three SCI interfaces, and an optional I²C bus interface. It operates at up to 25 MHz with 5 V supply and targets embedded control in PC peripherals and power management systems.

For engineers reviewing the DF2138RFA20JV datasheet, DF2138RFA20JV pinout, DF2138RFA20JV application, or DF2138RFA20JV equivalent, key selection considerations include its F-ZTAT™ flash architecture for field reprogrammability, NMOS push-pull output drivers on P52/P97, 100,000-cycle flash endurance, and support for subclock oscillator operation down to 32.768 kHz.

Technical Context

The DF2138RFA20JV implements the H8S/2000 CPU core with sixteen 16-bit general-purpose registers and a 16-Mbyte linear address space. It integrates a data transfer controller (DTC) for autonomous memory-to-peripheral transfers and supports timer connection for cascaded timing operations across multiple 8-bit TMR channels.

Its peripheral set includes dual 14-bit PWMX modules with independent duty-cycle control, three full-duplex SCI interfaces supporting IrDA, and dual 8-bit D/A converters with simultaneous update capability. The device uses NMOS push-pull outputs on pins P52/SCK0/SCL0 and P97/SDA0, requiring external pull-ups for high-level logic assertion under certain configurations.

Key Specifications

Pinout & Package

DF2138RFA20JV is housed in an 80-pin TFP-80C (thin fine-pitch plastic QFP) package with 0.5 mm lead pitch, compliant with JEDEC MO-220 standards. Thermal resistance θ_JA = 40°C/W enables operation up to +85°C ambient without forced airflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F2138AV and R5F21238SDFP, DF2138RFA20JV uniquely combines field-reprogrammable flash, dedicated keyboard scan hardware, and host interface logic - making it irreplaceable in legacy notebook keyboard and intelligent power supply designs requiring in-field firmware updates and minimal BOM count.

Availability

DF2138RFA20JV is available at Aetrix Electronics and suitable for notebook keyboard controllers, intelligent battery packs, PC monitor timing systems, and industrial power supply supervisors requiring stable component supply across multi-year production cycles.

Supply support for DF2138RFA20JV 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, and power devices for automotive, industrial, and consumer applications.

The H8S/2138 Group was designed specifically for cost-sensitive, high-integration embedded control in PC peripherals and power management systems - emphasizing fast startup, flexible firmware updates, and rich on-chip interface options.

FAQ

What is the maximum operating frequency of the DF2138RFA20JV?

The DF2138RFA20JV supports a maximum main clock frequency of 25 MHz. This timing is achievable with an external crystal or CMOS clock source connected to the CLK pin. Internal PLL or frequency multiplier circuits are not present - the CPU core runs synchronously with the input clock. DF2138RFA20JV maintains full specification compliance (including ADC accuracy and PWM resolution) across the entire 25 MHz range when powered at 4.5–5.5 V.

Does the DF2138RFA20JV support in-system programming of its flash memory?

Yes, the DF2138RFA20JV features F-ZTAT™ (Flexible-ZTAT) flash memory that supports full in-system programming via its on-chip serial interface or standard debug port. No external programmer or UV eraser is needed. DF2138RFA20JV guarantees 100,000 program/erase cycles and 10 years of data retention under specified operating conditions, enabling field firmware updates in deployed equipment such as battery packs and monitors.

Are pins P52 and P97 true open-drain outputs on the DF2138RFA20JV?

No - pins P52/SCK0/SCL0 and P97/SDA0 on the DF2138RFA20JV are NMOS push-pull outputs, not open-drain. They actively drive low but rely on external pull-up resistors to assert high logic levels. This differs from standard I²C-compliant open-drain behavior. DF2138RFA20JV requires external 4.7 kΩ pull-ups to VCC for reliable SCL0/SDA0 operation in I²C master mode.

What is the function of the DTC module in the DF2138RFA20JV?

The Data Transfer Controller (DTC) in DF2138RFA20JV performs autonomous data movement between memory and peripherals without CPU involvement - for example, transferring ADC conversion results directly into RAM buffers. DF2138RFA20JV's DTC reduces CPU loading by up to 70% in continuous acquisition tasks and eliminates interrupt latency jitter, improving determinism in real-time control loops like PWM-based power regulation.

Can the DF2138RFA20JV operate from a 3.3 V supply?

No - the DF2138RFA20JV is specified only for 4.5 V to 5.5 V operation. Its internal regulators, flash programming voltage generation, and NMOS output drivers are designed for 5 V logic levels. Attempting 3.3 V operation will result in undefined behavior, failed flash writes, and unreliable peripheral operation. DF2138RFA20JV does not support dual-supply or voltage-scaling modes.