Renesas UPD78F0397DGC-8EA-A

Overview

UPD78F0397DGC-8EA-A from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0/LE2 family, featuring 32 KB Flash memory, 1 KB RAM, 10-bit A/D converter (5 channels), LCD controller/driver (20 segment × 4 common), and dual UART interfaces including LIN-bus-capable UART6. It operates across 1.8 V to 5.5 V and targets embedded control in industrial HMI and low-power instrumentation.

For engineers reviewing the UPD78F0397DGC-8EA-A datasheet, UPD78F0397DGC-8EA-A pinout, UPD78F0397DGC-8EA-A application, or UPD78F0397DGC-8EA-A equivalent, key selection criteria include its 64-pin QFP package, 20 MHz max system clock (at 4.0–5.5 V), on-chip debug support, self-programmable Flash, and integrated LCD drive capability with booster/ladder mode selection.

Technical Context

The UPD78F0397DGC-8EA-A implements the 78K0 CPU core - an 8-bit CISC architecture supporting minimum instruction cycles of 0.1 µs at 20 MHz (4.0–5.5 V), 0.2 µs at 10 MHz (2.7–5.5 V), and 0.4 µs at 5 MHz (1.8–5.5 V). It integrates three independent clock domains: high-speed Ring-OSC (8 MHz typ.), low-speed Ring-OSC (240 kHz typ. for WDT), and subsystem crystal oscillator (32.768 kHz).

Peripherals include a 16-bit timer (1 channel), four 8-bit timers, watchdog timer, UART0/CSI1, UART6 with LIN physical layer support, I²C interface, and analog features such as AVREF-referenced A/D conversion and dedicated LVI/POC circuits. The device supports single-voltage Flash programming and on-chip debug via dedicated pins (e.g., P60/P61 for I²C, RESET_B for reset control).

Key Specifications

Pinout & Package

UPD78F0397DGC-8EA-A is housed in a 64-pin QFP package (12 mm × 12 mm, 0.65 mm pitch), RoHS-compliant and rated for industrial temperature range (−40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with R5F100PLAFB#30 and UPD78F0537GK-GAJ-AX, the UPD78F0397DGC-8EA-A uniquely balances integrated LCD drive, LIN-ready UART6, and compact 32 KB Flash - making it optimal for cost-sensitive, display-centric industrial controls where external drivers or CAN are not required.

Availability

UPD78F0397DGC-8EA-A is available at Aetrix Electronics and suitable for industrial panel meters, home appliance control panels, portable test equipment, and building automation sensors requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for UPD78F0397DGC-8EA-A 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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions for industrial, automotive, and IoT markets.

The UPD78F0397DGC-8EA-A belongs to the 78K0/LE2 product line - designed specifically for cost-effective, low-power embedded control applications with integrated human-machine interface (HMI) peripherals including LCD drivers and LIN-capable serial interfaces.

FAQ

What is the maximum operating frequency of the UPD78F0397DGC-8EA-A?

The UPD78F0397DGC-8EA-A supports a maximum system clock frequency of 20 MHz when operating at 4.0–5.5 V supply voltage, delivering a minimum instruction cycle time of 0.1 µs. At 2.7–4.0 V, the max frequency drops to 10 MHz (0.2 µs cycle), and at 1.8–2.7 V, it is limited to 5 MHz (0.4 µs cycle). These ratings are confirmed in the AC Characteristics section of the official Renesas documentation for UPD78F0397DGC-8EA-A.

Does the UPD78F0397DGC-8EA-A support LIN bus communication?

Yes, the UPD78F0397DGC-8EA-A includes UART6, which is explicitly designed to meet LIN 2.2 physical layer requirements per Renesas' functional description. UART6 supports standard LIN frame formatting, automatic sync-break detection, and configurable baud rates up to 20 kbps - enabling direct connection to LIN transceivers without protocol translation. This capability is documented in the "Peripherals" section of the UPD78F0397DGC-8EA-A datasheet.

What LCD configuration options does the UPD78F0397DGC-8EA-A support?

The UPD78F0397DGC-8EA-A supports up to 20 segment and 4 common LCD outputs, with programmable voltage generation via VLC0–VLC2 pins. Users can select either booster-type (charge-pump) or ladder-type (resistor-divider) bias circuitry in software, allowing optimization for different LCD glass types and supply voltages. This flexibility is detailed in the "LCD C/D" feature list and pin function table for UPD78F0397DGC-8EA-A.

Is on-chip debug functionality available on the UPD78F0397DGC-8EA-A?

Yes, the UPD78F0397DGC-8EA-A includes on-chip debug support, accessible via dedicated pins (e.g., P60/P61 for I²C-based debugging). This allows real-time program execution control, register inspection, and Flash programming without external emulators. The feature is explicitly noted in the "Features" section and confirmed in the "On-chip debug function*" footnote referencing uPD78F0363D - a member of the same 78K0/LE2 family sharing identical debug architecture with UPD78F0397DGC-8EA-A.

What are the power supply requirements for the A/D converter in the UPD78F0397DGC-8EA-A?

The A/D converter in the UPD78F0397DGC-8EA-A requires separate analog supply connections: AVREF (analog reference voltage) and AVSS (analog ground). AVREF may be tied to VDD or driven externally; AVSS must be connected to the same ground plane as VSS but routed separately to minimize digital noise coupling. These requirements are specified in the Pin Function table and DC Characteristics section for UPD78F0397DGC-8EA-A, ensuring accurate 10-bit conversion across all 5 channels.