Renesas UPD178F098GF-3BA-A

Overview

UPD178F098GF-3BA-A from NEC Electronics is an 8-bit single-chip microcontroller in the µPD178F098 subseries, featuring 128 KB on-chip flash memory, 8 KB RAM, and integrated IEBus controller for automotive network communication. It operates at up to 20 MHz CPU clock (via PLL), supports 16-bit timer/event counters, 8-channel 10-bit A/D converter, and 4-channel PWM output. It targets embedded control in automotive body electronics requiring real-time IEBus protocol handling.

For engineers reviewing the UPD178F098GF-3BA-A datasheet, UPD178F098GF-3BA-A pinout, UPD178F098GF-3BA-A application, or UPD178F098GF-3BA-A equivalent, key selection criteria include IEBus master/slave capability, flash reprogrammability via VPP pin, 10-bit A/D resolution with ANI0–ANI7 inputs, and support for 78K/0 Series instruction set compatibility.

Technical Context

This microcontroller implements the 78K/0 CPU core with Harvard architecture, supporting 131 instructions including bit manipulation and multiply/divide operations. It integrates a programmable PLL frequency synthesizer generating system clocks from 1–20 MHz, and features dual power domains (VDDCPU/VDDPORT) for low-power peripheral operation.

The IEBus controller complies with NEC's proprietary Industrial Ethernet Bus standard (IEBus v2.0), supporting both master and slave modes with automatic arbitration, broadcast addressing, and error detection per bit period. The A/D converter includes sample-and-hold and noise countermeasures for automotive sensor interfacing.

Key Specifications

Pinout & Package

UPD178F098GF-3BA-A 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 14 I/O ports (P0–P7, P10, P12, P13), dedicated IEBus pins (EO0, EO1), PLL analog supply pins (VCOL/VCOH), and programming voltage input (VPP).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F0732GC-GAD-AX and R5F10PLG, the UPD178F098GF-3BA-A uniquely delivers hardware-accelerated IEBus v2.0 compliance with minimal CPU overhead, making it irreplaceable in existing NEC-based automotive body networks where protocol timing and error handling must meet OEM IEBus specifications.

Availability

UPD178F098GF-3BA-A is available at Aetrix Electronics and suitable for automotive body control units, climate control systems, and steering column interface modules requiring stable component supply and long-term lifecycle support.

Supply support for UPD178F098GF-3BA-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

NEC Electronics Corporation (now Renesas Electronics) was a leading Japanese semiconductor manufacturer specializing in microcontrollers, analog ICs, and system-on-chip solutions for automotive and industrial markets.

The µPD178F098 series was designed specifically for automotive body electronics requiring robust IEBus communication, flash-based firmware updates, and operation under harsh electrical conditions typical of 12 V vehicle systems.

FAQ

What is the maximum operating frequency of the UPD178F098GF-3BA-A?

The UPD178F098GF-3BA-A achieves a maximum CPU clock frequency of 20 MHz using its internal PLL frequency synthesizer. This is derived from an external 1–8 MHz crystal connected to X1/X2, with PLL multiplication configured via the PRM0 register. The 20 MHz operation is fully supported across the specified 4.5–5.5 V supply range and industrial temperature grade (–40°C to +85°C), as confirmed in Chapter 25 Electrical Specifications of the U12790EJ2V0UD manual.

Does the UPD178F098GF-3BA-A support in-system programming?

Yes, the UPD178F098GF-3BA-A supports in-system programming via its dedicated VPP pin, which accepts 12.5 V to enable flash memory write and erase operations without removing the device from the target board. This capability is explicitly documented in Section 2.2.26 of the user's manual and is unique to the µPD178F098 variant-mask ROM versions lack this pin and function. The PG-FP3 and PG-FP4 programmers from NEC are qualified for this process.

What interfaces does the UPD178F098GF-3BA-A provide for automotive networking?

The UPD178F098GF-3BA-A integrates a dedicated hardware IEBus controller compliant with NEC's IEBus v2.0 specification, supporting both master and slave roles at 100 kbps. It does not include CAN, LIN, or FlexRay controllers. The EO0 and EO1 pins drive the differential IEBus physical layer directly, with built-in timing error detection and automatic broadcast flag handling-eliminating software overhead for protocol-level tasks in automotive body networks.

How many analog input channels does the UPD178F098GF-3BA-A have, and what is their resolution?

The UPD178F098GF-3BA-A includes eight analog input channels (ANI0 through ANI7), each supporting 10-bit resolution via a successive-approximation A/D converter. The converter features sample-and-hold circuitry and configurable noise countermeasures, as detailed in Section 11.5 of the user's manual. Input voltage range is 0 V to AVDD (typically 5 V), with absolute maximum ratings specifying AVSS = GND and AVDD ≤ VDD + 0.3 V.

Is the UPD178F098GF-3BA-A pin-compatible with other members of the µPD178098A subseries?

No, the UPD178F098GF-3BA-A is not pin-compatible with mask ROM variants like µPD178098A due to the presence of the VPP pin-a dedicated programming voltage input absent in ROM versions. While both share the same 100-pin LQFP package outline and core peripheral set, the VPP pin occupies a unique location (Pin 98) and alters the pin function mapping. Engineers must verify pin assignments against Figure 1-4 (Pin Configuration) and Table 2-1 in the U12790EJ2V0UD manual before board reuse.