Renesas R5F102A9ASP#10

Overview

R5F102A9ASP#10 from Renesas Electronics is a 30-pin LSSOP packaged RL78/G12 16-bit microcontroller designed for ultra-low-power embedded control in consumer-grade applications (–40°C to +85°C). It integrates 16 KB code flash, 2 KB data flash, 2 KB RAM, an 8-channel 10-bit A/D converter, and dual UART/CSI/I²C serial interfaces - enabling compact sensor node and appliance control designs with on-chip debug and self-programming capability.

For engineers reviewing the R5F102A9ASP#10 datasheet, R5F102A9ASP#10 pinout, R5F102A9ASP#10 application, or R5F102A9ASP#10 equivalent, key selection criteria include its 2 KB data flash retention, 30-pin LSSOP package with REGC regulator capacitor support, 16 MHz max main clock operation at 1.8 V, and integrated CRC/SFR guard safety features unique to R5F102-series devices.

Technical Context

The R5F102A9ASP#10 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting instruction execution times from 0.04167 µs (24 MHz on-chip oscillator) to 1 µs (1 MHz), and 1 MB address space. Its peripheral set includes TAU0 timer with 8 channels (7 PWM-capable), SAU0 with 4 CSI/I²C/UART channels, and DMA controller with 2 channels - all operating under true low-power HALT/STOP/SNOOZE modes.

It features dual voltage domains: high-accuracy ±1.0% high-speed on-chip oscillator (1–24 MHz, –20°C to +85°C), and dedicated 15 kHz low-speed oscillator for watchdog and interval timing. The analog subsystem includes AVREFP/AVREFM references, internal temperature sensor, and 8-channel A/D with 1.45 V internal reference - all functional across the full 1.8–5.5 V supply range.

Key Specifications

Pinout & Package

Package: 30-pin plastic LSSOP (7.62 mm, 0.65-mm pitch), RoHS-compliant, thermal pad not present. Requires 0.47–1 µF capacitor between REGC and VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F103A9ASP#10, the R5F102A9ASP#10 provides essential data retention and safety features for field-upgradable devices; compared with R5F102AAASP#10, it offers full in-system programmability - critical for prototyping, certification testing, and post-deployment firmware patches.

Availability

R5F102A9ASP#10 is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, and consumer IoT gateways requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for R5F102A9ASP#10 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 delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT applications.

The RL78/G12 product line targets ultra-low-power general-purpose control applications - balancing energy efficiency, integration density, and development simplicity for cost-sensitive, battery-operated, and consumer-grade electronics.

FAQ

What is the maximum operating frequency of the R5F102A9ASP#10 with its internal oscillator?

The R5F102A9ASP#10 supports a high-speed on-chip oscillator up to 24 MHz with ±1.0% accuracy (–20°C to +85°C). At 24 MHz, minimum instruction execution time is 0.04167 µs. For main system clock operation, the external crystal oscillator supports up to 20 MHz (VDD ≥ 2.7 V) or 8 MHz (VDD ≥ 1.8 V).

Does the R5F102A9ASP#10 support in-system programming of its data flash memory?

Yes, the R5F102A9ASP#10 supports background operation (BGO) for its 2 KB data flash memory, allowing program execution from code flash while simultaneously rewriting data flash. This is enabled via the RL78 Family Data Flash Library Type04 and requires proper configuration of the flash shield window.

What is the purpose of the REGC pin on the R5F102A9ASP#10, and how must it be connected?

The REGC pin on the R5F102A9ASP#10 connects to the internal voltage regulator's stabilization capacitor. It must be connected to VSS via a 0.47 µF to 1 µF ceramic capacitor - failure to do so risks unstable operation or failure to enter low-power modes. This requirement is specific to the 30-pin LSSOP variant and is documented in the RL78/G12 datasheet Section 1.4.3.

How many PWM outputs does the R5F102A9ASP#10 provide, and which timer module generates them?

The R5F102A9ASP#10 provides up to 7 hardware PWM outputs generated by the TAU0 timer array (8-channel 16-bit timer). PWM functionality is configurable per channel using master/slave relationships defined in the PIOR and TAU registers - enabling synchronized dimming, motor phase control, or audio tone generation without CPU overhead.

Is the R5F102A9ASP#10 pin-compatible with other RL78/G12 30-pin variants like R5F102AAASP#10?

Yes, the R5F102A9ASP#10 is pin-compatible with all RL78/G12 30-pin LSSOP variants including R5F102AAASP#10, R5F102A8ASP#10, and R5F102A7ASP#10. All share identical pin count, pitch, mechanical footprint (PLSP0030JB-B), and pin functions - differing only in memory configuration and flash/OTP type, not I/O mapping or electrical behavior.