Renesas R5F21194DD#V0

Overview

R5F21194DD#V0 from Renesas Electronics is a 16-bit single-chip microcontroller in the R8C/19 Group, featuring an R8C/Tiny Series CPU core, 16 KB program flash ROM, 2 KB data flash (1 KB × 2 blocks), and 1 KB RAM. It operates at up to 20 MHz (50 ns min instruction time), supports -40°C to +85°C ambient temperature, and integrates UART, clock-synchronous serial I/O, three timers (8-bit ×2, 16-bit ×1), a 4-channel 1-bit comparator, and on-chip oscillators. It targets embedded control in industrial sensors and appliance subsystems.

For engineers reviewing the R5F21194DD#V0 datasheet, R5F21194DD#V0 pinout, R5F21194DD#V0 application, or R5F21194DD#V0 equivalent, this page provides verified technical context, package-validated pin functions, real-world use scenarios, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The R5F21194DD#V0 implements a 16-bit R8C/Tiny CPU with 89 fundamental instructions and a 20-bit program counter, enabling 1 Mbyte address space access. Its memory architecture separates 16 KB program ROM (0C000h–0FFFFh) from dedicated 2 KB data flash (02400h–02BFFh) and 1 KB RAM (00400h–007FFh), supporting in-system reprogramming with 10,000 write/erase cycles for data flash.

Peripheral integration includes dual UART/clock-sync serial interfaces, Timer X/Z (8-bit with 8-bit prescaler) and Timer C (16-bit with input capture/output compare), a 4-channel 1-bit comparator with analog inputs AN8–AN11, and dual clock sources: main crystal oscillator (XIN/XOUT) and adjustable high-speed/low-speed on-chip oscillators - all managed via on-chip voltage detection and power-on reset circuits.

Key Specifications

Pinout & Package

Package: 20-pin molded-plastic SDIP (PRDP0020BA-A), 7.62 mm × 12.7 mm body, 2.54 mm lead pitch, RoHS-compliant, D-grade (-40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with R5F21194SP#V0 and R5F21194NP#V0, the R5F21194DD#V0 delivers identical MCU functionality in a through-hole SDIP package optimized for mechanical robustness, serviceability, and legacy design reuse - making it ideal for industrial control panels and field-deployed equipment where vibration resistance and hand-soldering are priorities.

Availability

R5F21194DD#V0 is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control modules, and security system keypads requiring stable component supply across extended product lifecycles.

Supply support for R5F21194DD#V0 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 solutions for industrial, automotive, and infrastructure markets.

The R8C/19 Group - including R5F21194DD#V0 - was designed for cost-sensitive, low-power embedded control in appliances, sensors, and office equipment, emphasizing integrated analog peripherals, flash endurance, and industrial temperature resilience.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for R5F21194DD#V0?

The R5F21194DD#V0 achieves a maximum operating frequency of 20 MHz at a supply voltage of 3.0 V to 5.5 V. At lower frequencies (e.g., 10 MHz), it supports down to 2.7 V. This dual-voltage/frequency specification allows flexible power-source selection - such as 3.3 V regulated rails or 4.5–5.5 V battery packs - while maintaining deterministic timing for real-time tasks in the R5F21194DD#V0.

Does R5F21194DD#V0 include on-chip debug support, and what interface does it use?

Yes, the R5F21194DD#V0 supports on-chip debugging via the single-wire background debug mode (BDM) using the RESET pin as the debug communication channel. This eliminates the need for dedicated debug headers, reducing PCB footprint and enabling in-system firmware updates and breakpoint-based troubleshooting directly through the R5F21194DD#V0's existing RESET circuitry.

How is the data flash memory organized and accessed in R5F21194DD#V0?

The R5F21194DD#V0 contains 2 KB of data flash memory arranged as two independent 1 KB blocks (02400h–027FFh and 02800h–02BFFh), each rated for 10,000 write/erase cycles. Access is controlled via dedicated flash control registers (FSR, FCR) and requires specific unlock sequences - enabling safe storage of calibration coefficients, device configuration, or usage logs without wearing out program ROM in the R5F21194DD#V0.

What are the key differences between R5F21194DD#V0 and R5F21184DD#V0?

The R5F21194DD#V0 includes 2 KB of data flash (1 KB × 2 blocks) and supports 10,000 write/erase cycles, whereas the R5F21184DD#V0 has no data flash and only program flash (16 KB) rated for 1,000 cycles. All other peripherals, pinout, package, and CPU features are identical - making the R5F21194DD#V0 the appropriate choice when nonvolatile parameter storage is required in the same physical form factor.

Can R5F21194DD#V0 operate from a single 3.3 V supply, and what are the implications for analog functions?

Yes, the R5F21194DD#V0 operates fully at 3.3 V (within its 2.7–5.5 V range). For analog functions like the comparator, AVCC and AVSS must be decoupled independently with 0.1 µF capacitors; the internal voltage detection circuit remains active, and reference voltage (VREF) can be derived from AVCC or an external source - ensuring accurate threshold detection in the R5F21194DD#V0 even under nominal 3.3 V rail conditions.