Renesas UPD78F9222CS-CAC-A

Overview

UPD78F9222CS-CAC-A from Renesas Electronics is an 8-bit single-chip microcontroller in the 78K0S/KA1+ family, featuring 4 KB on-chip Flash memory, 256 bytes of high-speed RAM, a 10-bit 4-channel A/D converter, UART with LIN bus support, and four timer channels-including one 16-bit timer/event counter-designed for embedded control in automotive electronics and industrial equipment.

For engineers reviewing the UPD78F9222CS-CAC-A datasheet, UPD78F9222CS-CAC-A pinout, UPD78F9222CS-CAC-A application, or UPD78F9222CS-CAC-A equivalent, key selection considerations include its 20-pin SDIP package, 2.2–5.5 V supply range, −40 to +85°C operating temperature, LIN-capable UART interface, and self-programmable Flash architecture supporting in-system updates.

Technical Context

The UPD78F9222CS-CAC-A implements the 78K0S CPU core with selectable minimum instruction execution time (0.2–3.2 µs at 10 MHz X1 clock), dual internal oscillators (8 MHz high-speed and 240 kHz low-speed), and integrated power-on clear (POC) and low-voltage detector (LVI) circuits. Its peripheral set includes vectored interrupts (13 sources), reset control via RESET pin or internal events, and dedicated analog I/O with AVREF reference input.

It supports multiple clock sources: external crystal/ceramic resonator (2–10 MHz), external clock input, or internal oscillators-with system clock selection configured via option bytes. The A/D converter operates with AVREF as reference and shares VSS as analog ground, requiring stable grounding per design guidelines.

Key Specifications

Pinout & Package

UPD78F9222CS-CAC-A is housed in a 20-pin plastic SDIP (7.62 mm, 300 mil) package with gull-wing leads, lead-free per RoHS compliance (indicated by "-A" suffix). Pin functions are multiplexed across port I/O and peripheral signals including analog inputs, timer outputs, UART lines, and oscillator connections.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F9222CS-CAC-A, the RL78/G13 offers greater scalability but requires migration effort, while UPD78F9221CS-CAC-A provides seamless hardware compatibility at lower memory capacity-making it ideal for derivative designs or cost-optimized variants.

Availability

UPD78F9222CS-CAC-A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor nodes, and smart appliance controllers requiring stable component supply across extended product lifecycles.

Supply support for UPD78F9222CS-CAC-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 specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The UPD78F9222CS-CAC-A belongs to the 78K0S/KA1+ microcontroller line, designed specifically for cost-sensitive, low-power embedded control applications requiring LIN communication, analog sensing, and robust operation across industrial temperature ranges.

FAQ

What is the maximum operating frequency supported by the UPD78F9222CS-CAC-A?

The UPD78F9222CS-CAC-A supports a maximum system clock frequency of 10 MHz when using an external crystal or clock source (X1 input), delivering a minimum instruction execution time of 0.2 µs. With the internal high-speed oscillator, it operates up to 8 MHz (typical), and the low-speed oscillator runs at 240 kHz for watchdog and low-power modes. All frequencies are validated across the −40°C to +85°C temperature range and 2.2–5.5 V supply.

Does the UPD78F9222CS-CAC-A support LIN bus communication natively?

Yes, the UPD78F9222CS-CAC-A includes a UART module (UART6) explicitly designed to support Local Interconnect Network (LIN) bus communication per ISO 9141-2 and SAE J2602 timing requirements. Its RxD6 and TxD6 pins provide LIN-compliant receive and transmit functionality, enabling direct integration into automotive body electronics networks without external transceivers for basic slave-node implementations.

How much Flash memory does the UPD78F9222CS-CAC-A have, and is it reprogrammable in-circuit?

The UPD78F9222CS-CAC-A contains 4 KB of on-chip Flash memory that supports single-voltage self-programming. This allows full in-system programming (ISP) and in-application programming (IAP) without requiring external high-voltage signals-enabling firmware updates during development, manufacturing, or field deployment using standard UART or other interfaces.

What are the analog input capabilities of the UPD78F9222CS-CAC-A?

The UPD78F9222CS-CAC-A integrates a 10-bit successive-approximation A/D converter with four input channels (ANI0–ANI3 mapped to P20–P23). It uses AVREF as the reference voltage and shares VSS as the analog ground. Input voltage range is 0 to AVREF, with specified DC accuracy and sampling performance across the full operating temperature and supply range.

Is the UPD78F9222CS-CAC-A pin-compatible with any other devices in the same family?

Yes, the UPD78F9222CS-CAC-A is pin-compatible with the UPD78F9221CS-CAC-A, sharing identical 20-pin SDIP packaging, pin assignments, and peripheral mappings-including UART6, A/D inputs, timer outputs, and oscillator connections. Firmware and hardware designs can be reused between them, differing only in Flash (4 KB vs. 2 KB) and RAM (256 vs. 128 bytes) capacities.