Renesas R5F1051AGSP#10

Overview

R5F1051AGSP#10 from Renesas Electronics is a 10-pin, ultra-low-power RL78/G11 16-bit microcontroller designed for cost-sensitive consumer and industrial embedded control. It integrates 16 KB code flash, 2 KB data flash, 1.5 KB RAM, 10-bit A/D converter (3 channels), 8-bit D/A converter (1 channel), 2 comparators, and a 12-bit interval timer - all operating from 1.6 V to 5.5 V supply. Its primary role is system-level sensor interfacing and low-duty-cycle control in battery-powered home appliances.

For engineers reviewing the R5F1051AGSP#10 datasheet, R5F1051AGSP#10 pinout, R5F1051AGSP#10 application, or R5F1051AGSP#10 equivalent, key selection criteria include its 10-pin LSSOP package, 58.3 μA/MHz active current, STOP mode power consumption of 0.64 μA, and integrated voltage detector with 14-level LVD interrupt/reset capability.

Technical Context

The R5F1051AGSP#10 implements the RL78 CPU core with CISC architecture and 3-stage pipeline, supporting instruction execution times from 0.04167 μs (24 MHz high-speed on-chip oscillator) to 66.6 μs (15 kHz low-speed oscillator). It uses a single-regulator architecture with REGC capacitor filtering and supports clock switching between high-speed (up to 24 MHz), middle-speed (4 MHz), and low-speed (15 kHz) on-chip oscillators.

Peripheral integration includes one simplified SPI (CSI), one UART, two I²C-compatible interfaces, event link controller (ELC) with 11 input events, data transfer controller (DTC) with 13 activation sources, and programmable clock/buzzer output (PCLBUZ0). All analog functions - A/D, D/A, comparators, and PGA - share common reference inputs (AVREFP/AVREFM) and operate across the full 1.6–5.5 V VDD range.

Key Specifications

Pinout & Package

Package: 10-pin plastic LSSOP (4.4 × 3.6 mm, 0.65-mm pitch), lead-free, RoHS compliant. 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 R5F1054AGSP#10 and R5F1056AGSP#30, the R5F1051AGSP#10 delivers minimal footprint and lowest BOM cost for single-sensor, single-serial-interface control tasks - trading I/O and peripheral count for PCB area and power savings.

Availability

R5F1051AGSP#10 is available at Aetrix Electronics and suitable for smart thermostat sensor nodes, low-power industrial monitors, compact appliance control boards, and energy-efficient HVAC fan controllers requiring stable component supply and long-term industrial qualification.

Supply support for R5F1051AGSP#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/G11 product line targets cost-optimized, ultra-low-power general-purpose microcontrollers for consumer and industrial equipment where small footprint, robust analog integration, and extended temperature operation are essential.

FAQ

What is the maximum operating frequency of the R5F1051AGSP#10?

The R5F1051AGSP#10 supports a maximum system clock frequency of 24 MHz using the high-speed on-chip oscillator. When driven by an external crystal (X1), the maximum frequency is 20 MHz at VDD ≥ 2.7 V, scaling down to 4 MHz at VDD = 1.6 V. Instruction execution time ranges from 0.04167 μs (24 MHz) to 66.6 μs (15 kHz), enabling flexible trade-offs between performance and power.

Does the R5F1051AGSP#10 support in-system programming?

Yes, the R5F1051AGSP#10 supports full in-system programming via its on-chip debug interface and boot swap function. Code flash and data flash can be rewritten while the device operates, with background operation (BGO) allowing program execution during data flash updates. The flash library uses RAM starting at address FF900H, and data flash endurance is rated at 1,000,000 write cycles.

How many analog input channels does the R5F1051AGSP#10 have?

The R5F1051AGSP#10 features three external analog input channels (ANI0, ANI1, ANI2) and one internal channel (temperature sensor). All analog inputs operate across the full 1.6–5.5 V VDD range and share the same reference structure: AVREFP (+) and AVREFM (−), with internal 1.45 V reference available for A/D conversion.

What is the purpose of the REGC pin on the R5F1051AGSP#10?

The REGC pin on the R5F1051AGSP#10 connects to the internal voltage regulator's stabilization capacitor. It must be tied to VSS through a 0.47–1 μF ceramic capacitor to ensure stable core voltage regulation. Failure to connect REGC properly results in undefined operation, including potential failure of the on-chip oscillator and flash programming functions.

Can the R5F1051AGSP#10 generate audible tones?

Yes, the R5F1051AGSP#10 includes a programmable clock/buzzer output (PCLBUZ0) capable of generating precise audio frequencies from 117 Hz to 15 kHz using the low-speed on-chip oscillator (15 kHz), and from 2.44 kHz to 10 MHz using the main system clock. This eliminates the need for external tone generators in applications like appliance status alerts and thermostat feedback.