Renesas UPD78F1831GBA-GAH-G

Overview

UPD78F1831GBA-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 integrated peripherals including 12-bit ADC (16 channels), 8-bit D/A converter, UART, CSI, I²C, and timer modules. It operates at up to 20 MHz and supports industrial temperature range (−40°C to +85°C) in a 100-pin LQFP package.

For engineers reviewing the UPD78F1831GBA-GAH-G datasheet, UPD78F1831GBA-GAH-G pinout, UPD78F1831GBA-GAH-G application, or UPD78F1831GBA-GAH-G equivalent, key selection considerations include Flash endurance (100,000 write/erase cycles), on-chip debug support via JTAG, low-power modes (HALT, STOP, SNOOZE), and compliance with IEC 61508 SIL2 functional safety requirements for embedded control systems.

Technical Context

The UPD78F1831GBA-GAH-G implements the 78K0R CPU core with 16-bit architecture, Harvard memory organization, and 3-stage pipeline execution. It integrates a 12-bit successive-approximation ADC with sample-and-hold and hardware-triggered conversion sequencing across 16 input channels.

Peripheral subsystems include three 16-bit timer arrays (TAU) supporting PWM generation, input capture, and interval timing; two serial interfaces (CSI and UART) with clock synchronization and framing error detection; and an I²C-compatible interface supporting standard/fast-mode operation up to 400 kbps.

Key Specifications

Pinout & Package

UPD78F1831GBA-GAH-G is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions follow the 78K0R/FE3 standard layout: Port 0–15 provide general-purpose I/O with alternate peripheral functions; AVREF/AVSS enable precise analog reference; RESET supports both external reset and internal voltage-detect reset; REGC configures internal regulator output voltage.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F10PLGDFB#30, UPD78F1831GBA-GAH-G provides superior analog integration and deterministic low-power operation; versus MB9BF516RPMC-G-S2, it offers smaller footprint, lower system BOM cost, and simpler power sequencing - making it optimal for resource-constrained industrial controllers where mixed-signal precision and reliability outweigh raw compute throughput.

Availability

UPD78F1831GBA-GAH-G is available at Aetrix Electronics and suitable for industrial motor control, building automation, energy metering, and human-machine interface applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for UPD78F1831GBA-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, and power devices for industrial, automotive, and infrastructure markets.

The 78K0R/Fx3 product line delivers high-integration 16-bit MCUs optimized for deterministic real-time control, robust analog signal acquisition, and functional safety compliance in industrial equipment and factory automation systems.

FAQ

What is the maximum operating frequency of the UPD78F1831GBA-GAH-G?

The UPD78F1831GBA-GAH-G operates at a maximum CPU clock frequency of 20 MHz. This is achieved using the on-chip high-speed oscillator (HOCO) or an external crystal/resonator up to 20 MHz. The 78K0R CPU core executes most instructions in one or two clock cycles, enabling deterministic real-time response critical for motor control and industrial timing applications. The UPD78F1831GBA-GAH-G maintains full specification compliance-including ADC accuracy and peripheral timing-at this maximum frequency.

Does the UPD78F1831GBA-GAH-G support in-circuit debugging without external hardware?

Yes, the UPD78F1831GBA-GAH-G includes a built-in JTAG-compliant on-chip debug interface that enables full in-circuit debugging, flash programming, and real-time trace without requiring an external emulator. Engineers can perform breakpoint setting, register inspection, and memory read/write directly through the JTAG port using standard tools like Renesas CS+ or e² studio. This capability is fully integrated into the UPD78F1831GBA-GAH-G silicon and requires only four dedicated pins (TCK, TMS, TDI, TDO) and proper pull-up/pull-down biasing.

What analog peripherals are integrated into the UPD78F1831GBA-GAH-G?

UPD78F1831GBA-GAH-G integrates a 12-bit successive-approximation ADC with 16 input channels, a sample-and-hold circuit, and hardware-triggered conversion sequencing; plus an 8-bit D/A converter with two independent output channels. Both peripherals share dedicated analog power domains (AVDD/AVSS) and reference inputs (AVREF), supporting simultaneous high-precision acquisition and analog output generation. These features are confirmed in the 78K0R/Fx3 Hardware User's Manual Rev.6.00 and are physically implemented in the UPD78F1831GBA-GAH-G die.

Is the UPD78F1831GBA-GAH-G qualified for industrial temperature operation?

Yes, the UPD78F1831GBA-GAH-G is rated for industrial temperature operation from −40°C to +85°C. This qualification is specified in Renesas' official ordering information and verified across all electrical parameters in the device's datasheet. The "G" suffix in the part number denotes industrial-grade qualification, and the "A2" grade variant (as indicated in the 78K0R/Fx3 family documentation) confirms extended temperature testing and screening per industrial reliability standards.

How does the UPD78F1831GBA-GAH-G handle power supply regulation for mixed-signal operation?

The UPD78F1831GBA-GAH-G uses an internal LDO regulator controlled by the REGC pin to generate separate analog (AVDD) and digital (EVDD) supply voltages from a single external VDD source. When REGC is pulled high, the LDO outputs 3.3 V; when pulled low, it outputs 5.0 V - allowing flexible system-level power architecture. This dual-domain design isolates noise-sensitive analog circuits (ADC, DAC) from digital switching transients, ensuring stable 12-bit ADC performance even under heavy I/O activity. The UPD78F1831GBA-GAH-G datasheet specifies AVDD/EVDD ripple rejection and load regulation limits confirming this architecture.