Renesas UPD78F1831AGBA2-GAH-G

Overview

UPD78F1831AGBA2-GAH-G from Renesas Electronics is a 16-bit single-chip microcontroller in the 78K0R/FE3 family, featuring 256 KB Flash memory, 16 KB RAM, and a maximum CPU clock of 20 MHz. It integrates 12-bit ADC (16 channels), 8-bit D/A converter, 32-bit timer, watchdog timer, and UART/SPI/I²C interfaces. Designed for industrial control and sensor-based embedded systems requiring deterministic real-time response.

For engineers reviewing the UPD78F1831AGBA2-GAH-G datasheet, UPD78F1831AGBA2-GAH-G pinout, UPD78F1831AGBA2-GAH-G application, or UPD78F1831AGBA2-GAH-G equivalent, key selection criteria include Flash endurance (100k write/erase cycles), operating voltage range (2.7–5.5 V), -40°C to +85°C industrial temperature grade, and support for on-chip debug via FINE interface.

Technical Context

The UPD78F1831AGBA2-GAH-G implements the 78K0R CPU core with 16-bit architecture, Harvard memory organization, and instruction set compatible with earlier 78K0 devices. It supports multiple low-power modes including HALT, STOP, and SNOOZE, with wake-up capability from external interrupts or peripheral events.

On-chip peripherals include a 12-bit successive-approximation ADC with sample-and-hold, programmable gain amplifier input option, and hardware-triggered conversion sequencing. The MCU also features a 32-bit real-time counter with calendar function, two 16-bit reload timers, and four 8-bit PWM output channels with dead-time insertion.

Key Specifications

Pinout & Package

UPD78F1831AGBA2-GAH-G is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions include 80 general-purpose I/O lines, 16 analog inputs, 4 dedicated PWM outputs, and dual supply domains (VDD/EVDD, VSS/EVSS) for noise isolation between digital and analog sections.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F10PLGDFB#30 and STM32F072RBT6, the UPD78F1831AGBA2-GAH-G delivers higher analog integration (12-bit ADC + DAC + PGA + calendar RTC) in a single chip, reducing system-level component count and PCB area - especially valuable in space-constrained industrial modules where mixed-signal precision and deterministic timing are critical.

Availability

UPD78F1831AGBA2-GAH-G is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and power supply monitoring requiring stable component supply across extended product lifecycles.

Supply support for UPD78F1831AGBA2-GAH-G 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The 78K0R/Fx3 product line - including UPD78F1831AGBA2-GAH-G - was designed for cost-sensitive, high-reliability industrial embedded applications requiring rich analog integration, deterministic real-time performance, and long-term supply assurance.

FAQ

What is the maximum operating frequency of the UPD78F1831AGBA2-GAH-G?

The UPD78F1831AGBA2-GAH-G operates at a maximum CPU clock frequency of 20 MHz across its full specified voltage range (2.7 V to 5.5 V). This frequency is achievable without external PLL multiplication, relying on the on-chip high-speed oscillator (HOCO) or external crystal input. At 20 MHz, the device executes instructions with predictable timing - critical for servo control loops and real-time communication stacks. The UPD78F1831AGBA2-GAH-G maintains this performance over the full industrial temperature range (-40°C to +85°C).

Does the UPD78F1831AGBA2-GAH-G support in-system programming (ISP)?

Yes, the UPD78F1831AGBA2-GAH-G supports in-application programming (IAP) via its on-chip Flash memory controller. Firmware updates can be performed while the device is running, using a user-defined bootloader that resides in protected Flash sectors. Programming is executed through the FINE debug interface or via UART using Renesas' Flash Development Toolkit (FDT). The UPD78F1831AGBA2-GAH-G guarantees 100,000 write/erase cycles and data retention for 20 years at 85°C - validated per JEDEC JESD22-A117.

What analog peripherals are integrated into the UPD78F1831AGBA2-GAH-G?

The UPD78F1831AGBA2-GAH-G integrates a 12-bit successive-approximation ADC with 16 input channels, an 8-bit D/A converter with 2 output channels, a programmable gain amplifier (PGA) supporting gains from 1× to 64×, and a 2.5 V internal reference voltage (±1% tolerance). These peripherals share dedicated analog supply pins (EVDD/EVSS) and include hardware-triggered conversion sequencing, making the UPD78F1831AGBA2-GAH-G suitable for sensor signal conditioning without external op-amps or references.

Is the UPD78F1831AGBA2-GAH-G pin-compatible with other 78K0R/FE3 devices?

No, the UPD78F1831AGBA2-GAH-G is not pin-compatible with other 78K0R/FE3 devices such as UPD78F1822 or UPD78F1835. While all FE3 devices use the same 100-pin LQFP package, pin assignments for peripheral functions (e.g., UART, SPI, ADC inputs) differ significantly across variants due to differing peripheral configurations and I/O multiplexing schemes. Migration requires PCB layout revision and firmware adaptation. The UPD78F1831AGBA2-GAH-G pinout is fixed per Renesas document R01UH0007EJ0600, Section 1.5.3.

What debug interface does the UPD78F1831AGBA2-GAH-G use?

The UPD78F1831AGBA2-GAH-G uses the FINE (Fast In-circuit NEtwork) interface for on-chip debugging. FINE operates over a 2-wire physical layer (clock + data) and supports non-intrusive real-time tracing, breakpoint setting, register inspection, and memory read/write without halting CPU execution. It replaces traditional ICE hardware and is supported by Renesas' CS+ IDE and E2 studio. The UPD78F1831AGBA2-GAH-G does not require external debug probes beyond a standard FINE adapter cable.