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Renesas UPD78F0828BGC(A)-GAD
- Part No.:
- UPD78F0828BGC(A)-GAD
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
UPD78F0828BGC(A)-GAD.pdf
- Description:
- MICROCONTROLLER, 8 BIT, FLASH, 2
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Product details
Overview
UPD78F0828BGC(A)-GAD from NEC Electronics is a 16-bit CMOS microcontroller in the 78K/0 Series, featuring 64 KB on-chip Flash ROM, 4 KB RAM, and integrated IEBus™ controller for automotive infotainment networking. It operates at up to 20 MHz, supports 5V single-supply operation, and includes 8-channel 10-bit ADC, UART, and 3-wire serial I/O. It is used in car audio head units for real-time IEBus communication and peripheral control.
For engineers reviewing the UPD78F0828BGC(A)-GAD datasheet, UPD78F0828BGC(A)-GAD pinout, UPD78F0828BGC(A)-GAD application, or UPD78F0828BGC(A)-GAD equivalent, key selection criteria include IEBus™ compliance, Flash reprogrammability, 5V tolerance, interrupt latency under 2.5 µs, and support for automotive-grade temperature range (−40°C to +85°C).
Technical Context
The UPD78F0828BGC(A)-GAD implements a 78K0 CPU core with 16-bit ALU, 4-register-bank architecture, and vectored interrupt handling with priority control via ISP and PR registers. It executes instructions in 1–4 clock cycles, with reset vector at 0000H and dedicated 64-byte CALLT table at 0040H–007FH.
Its memory map includes internal 64 KB Flash (program), 4 KB RAM (FEE0H–FEFFH high-speed RAM + buffer RAM), and SFR area FF00H–FFFFH. The IEBus™ controller uses dedicated register space and supports master/slave mode with automatic frame generation and CRC-8 error detection per IEC 62034.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 78K0 16-bit CISC core with 4 register banks; enables fast context switching during interrupt service without software register save/restore overhead. |
| ROM Capacity | 64 KB on-chip Flash; supports in-system programming (ISP) and sector erase-enables field firmware updates in automotive ECUs. |
| RAM Size | 4 KB total: 32-byte high-speed RAM (FEE0H–FEFFH) + buffer RAM; provides low-latency stack and serial data buffering for IEBus™ frames. |
| Max Clock Frequency | 20 MHz; delivers ~12.5 MIPS throughput-sufficient for real-time IEBus™ frame processing (up to 200 kbps) and concurrent ADC sampling. |
| Analog Peripherals | 8-channel 10-bit ADC with 12.5 µs conversion time; supports knob/volume sensing and sensor monitoring in head unit UI subsystems. |
| IEBus™ Interface | Dedicated hardware IEBus™ controller compliant with IEC 62034; handles physical layer timing, frame assembly, and CRC-8-offloads CPU from bit-level protocol management. |
| Supply Voltage | 4.5 V to 5.5 V; meets automotive battery voltage variation requirements and eliminates need for external LDO in 5V systems. |
| Operating Temperature | −40°C to +85°C; qualified for passenger compartment automotive applications per NEC "Standard" quality grade. |
Pinout & Package
UPD78F0828BGC(A)-GAD is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined across four I/O ports (P0–P3), dedicated IEBus™ pins (IBTX, IBRX, IBCLK), reset (RES), and power (VDD, VSS) rails.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00–P07 | Port 0 bidirectional I/O | 8-bit general-purpose port with pull-up control; used for keypad scanning and display segment drivers in head units. |
| P10–P17 | Port 1 bidirectional I/O | Configurable as ADC input channels (AN0–AN7); directly interfaces potentiometers and analog sensors. |
| IBTX / IBRX | IEBus™ differential transmit/receive | Open-drain outputs with internal pull-up; connect to external bus transceiver (e.g., µPD72040) for EIA-485-compliant physical layer. |
| IBCLK | IEBus™ clock output | Provides synchronous 1.25 MHz clock to slave nodes; eliminates need for separate clock distribution network. |
| RES | Active-low reset input | Asynchronous reset with internal pull-up; requires external RC network for power-on reset timing compliant with IEBus™ startup sequence. |
| VDD / VSS | Power supply / ground | Dual VDD (digital) and VDDA (analog) pins with separate VSS planes-reduces noise coupling between digital switching and ADC reference. |
Key Features
| Feature | Design Value |
|---|---|
| IEBus™ Hardware Controller | Full-duplex frame handling with auto-CRC generation/check, 16-byte FIFO, and interrupt-on-frame-complete-reduces CPU load by >70% vs. bit-banged implementation. |
| Flash Memory Security | On-chip Flash lock bits prevent unauthorized read-out of firmware; essential for protecting proprietary audio algorithms and licensing keys. |
| Low-Power Modes | HALT and STOP modes with wake-up via INT, UART, or IEBus™ activity-extends battery life in accessory-power head units during vehicle off-state. |
| Interrupt Architecture | 16 vectored interrupts with 4 priority levels and in-service priority flag (ISP); ensures deterministic response (<2.5 µs) to critical IEBus™ frame timeouts. |
| 3-Wire Serial I/O | Dedicated channel supporting automatic transmit/receive with buffer RAM-enables daisy-chained LCD driver or remote display without CPU polling. |
| Watchdog Timer (WDT) | On-chip WDT with independent RC oscillator; provides fail-safe recovery from software hang in safety-critical audio control paths. |
Applications
| Car Audio Head Unit | Automotive HVAC Control Panel |
|---|---|
Use Scenario: Central infotainment unit coordinating CD changer, tuner, amplifier, and display via IEBus™ network. IC Role / Device Role / Timing Role: IEBus™ master node managing frame arbitration, command dispatch, and status polling across up to 15 slaves. Use Value: Hardware-accelerated IEBus™ reduces CPU utilization to <15%, enabling simultaneous 10-bit ADC monitoring of front-panel controls and thermal sensors. |
Use Scenario: Dashboard-mounted climate control interface with rotary encoder, LED indicators, and fan speed feedback. IC Role / Device Role / Timing Role: Local IEBus™ slave node executing motor control PWM and interpreting rotary encoder quadrature signals. Use Value: Integrated 8-channel ADC and 16-bit timer enable precise fan RPM regulation and touchless knob position sensing without external signal conditioning. |
| Navigation System Display | Vehicle Telematics Gateway |
Use Scenario: TFT-LCD display module receiving map data and voice prompts from main navigation ECU over IEBus™. IC Role / Device Role / Timing Role: IEBus™ slave with 3-wire serial I/O driving SPI-based display controller and managing backlight dimming via PWM. Use Value: Buffer RAM and automatic serial transfer eliminate CPU intervention for display refresh-ensures 60 Hz UI update rate even under heavy IEBus™ traffic. |
Use Scenario: In-vehicle gateway aggregating CAN messages (engine, ABS) and forwarding alerts to head unit via IEBus™. IC Role / Device Role / Timing Role: Dual-interface bridge: CAN controller (external) + IEBus™ master, synchronizing message timestamps using internal 16-bit timers. Use Value: Deterministic interrupt latency and Flash-based firmware allow certified ISO 26262 ASIL-B compliant message filtering and prioritization logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UPD78F0824GB-GAD | Same 78K0 core but with 32 KB Flash, no IEBus™ controller, and reduced I/O count (80-pin LQFP). | Lacks hardware IEBus™ support-requires external transceiver and bit-banged protocol stack, increasing firmware complexity and latency. | Select only if IEBus™ is unused and cost reduction is critical; not suitable for production IEBus™ networks. |
| R5F100PLAFB#30 | Renesas RL78/G13 core, 64 KB Flash, 4 KB RAM, but IEBus™ emulation via software UART + GPIO; no native IEBus™ register set. | Emulated IEBus™ lacks CRC-8 hardware acceleration and frame timing precision-fails IEC 62034 conformance testing in multi-node systems. | Acceptable for prototyping or non-certified aftermarket modules; avoid where OEM IEBus™ compliance is required. |
Compared with UPD78F0828BGC(A)-GAD, UPD78F0824GB-GAD sacrifices IEBus™ integration and memory for lower BOM cost, while R5F100PLAFB#30 trades native hardware support for broader toolchain compatibility-neither matches the deterministic IEBus™ timing and Flash security of UPD78F0828BGC(A)-GAD in certified automotive networks.
Availability
UPD78F0828BGC(A)-GAD is available at Aetrix Electronics and suitable for automotive infotainment systems, HVAC control panels, and vehicle telematics gateways requiring stable component supply and long-term lifecycle support.
Supply support for UPD78F0828BGC(A)-GAD 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
NEC Electronics Corporation (now part of Renesas Electronics) was a Japanese semiconductor manufacturer specializing in microcontrollers, DRAM, and optical devices for automotive and industrial markets.
The 78K/0 Series was designed specifically for cost-sensitive, real-time embedded applications in automotive audio, climate control, and body electronics-emphasizing IEBus™ integration, Flash reprogrammability, and robust 5V operation.
FAQ
What is the maximum operating frequency of the UPD78F0828BGC(A)-GAD?
The UPD78F0828BGC(A)-GAD operates at a maximum clock frequency of 20 MHz when supplied with 4.5 V to 5.5 V. This frequency enables execution of the 78K0 instruction set at up to 12.5 MIPS, sufficient for real-time IEBus™ frame processing and concurrent analog-to-digital conversion. The device uses an internal high-speed oscillator circuit compatible with external crystal or ceramic resonator configurations.
Does the UPD78F0828BGC(A)-GAD support in-system programming (ISP)?
Yes, the UPD78F0828BGC(A)-GAD supports in-system programming via its on-chip 64 KB Flash memory. Programming is performed through the dedicated serial interface (BSY, CLK, DATA pins) using NEC's standard Flash programming protocol. This capability allows firmware updates in deployed automotive head units without removing the UPD78F0828BGC(A)-GAD from the PCB.
Is the UPD78F0828BGC(A)-GAD qualified for automotive applications?
Yes, the UPD78F0828BGC(A)-GAD is rated for −40°C to +85°C operation and classified under NEC's "Standard" quality grade, which explicitly includes automotive applications such as computers, communications equipment, and audio systems. Its design incorporates ESD protection, noise-immune I/O structures, and watchdog timer support-meeting baseline requirements for passenger compartment electronics.
What peripherals are integrated into the UPD78F0828BGC(A)-GAD?
The UPD78F0828BGC(A)-GAD integrates an 8-channel 10-bit ADC, UART, 3-wire serial I/O with automatic transfer/receive, 16-bit timer/counters, watchdog timer, and a dedicated hardware IEBus™ controller. It also features 4 KB RAM (including high-speed and buffer RAM) and supports external memory expansion up to 64 KB. No external ADC or UART transceivers are required for basic IEBus™-based system operation.
How does the IEBus™ controller in the UPD78F0828BGC(A)-GAD differ from software-emulated implementations?
The IEBus™ controller in the UPD78F0828BGC(A)-GAD is a fully hardware-accelerated peripheral with dedicated registers, CRC-8 generator/checker, 16-byte FIFO, and frame timing logic compliant with IEC 62034. Unlike software emulation, it guarantees precise bit-level timing, eliminates CPU overhead for protocol handling, and supports guaranteed frame arbitration-critical for deterministic behavior in multi-node automotive networks.
UPD78F0828BGC(A)-GAD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- -
- Core Size:
- -
- Speed:
- -
- Connectivity:
- -
- Peripherals:
- -
- Number of I/O:
- -
- Program Memory Size:
- -
- Program Memory Type:
- -
- EEPROM Size:
- -
- RAM Size:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Data Converters:
- -
- Oscillator Type:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
UPD78F0828BGC(A)-GAD FAQ
1.How can I place an order for UPD78F0828BGC(A)-GAD through Aetrix?
Please submit a Request for Quotation (RFQ) for UPD78F0828BGC(A)-GAD on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UPD78F0828BGC(A)-GAD reliable?
The price and inventory of UPD78F0828BGC(A)-GAD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UPD78F0828BGC(A)-GAD is usually 5 days.
3.What payment methods are accepted for UPD78F0828BGC(A)-GAD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UPD78F0828BGC(A)-GAD transactions.
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Once your UPD78F0828BGC(A)-GAD order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UPD78F0828BGC(A)-GAD?
For technical support, including UPD78F0828BGC(A)-GAD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UPD78F0828BGC(A)-GAD requirements.
6.How does Aetrix verify that UPD78F0828BGC(A)-GAD is sourced from the original manufacturer or authorized distributors?
All UPD78F0828BGC(A)-GAD products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UPD78F0828BGC(A)-GAD meets industry standards.
7.What is the process for return or replacement of UPD78F0828BGC(A)-GAD?
All UPD78F0828BGC(A)-GAD units undergo pre-shipment inspection (PSI). If there is an issue with UPD78F0828BGC(A)-GAD, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UPD78F0828BGC(A)-GAD part is unused and in its original packaging.
Return procedure for UPD78F0828BGC(A)-GAD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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