Renesas M34286G2GP#V2

Overview

M34286G2GP#V2 from Renesas Electronics is a 4-bit single-chip CMOS microcomputer designed for infrared remote control transmitters, featuring 2048 words × 9-bit mask ROM, 64 words × 4-bit RAM, dual 8-bit timers (Timer 1 with auto-control carrier output, Timer 2 with dual reload registers), and 16 I/O terminals including dedicated CARR output for IR carrier generation.

For engineers reviewing the M34286G2GP#V2 datasheet, M34286G2GP#V2 pinout, M34286G2GP#V2 application, or M34286G2GP#V2 equivalent, key selection considerations include its ceramic-resonator-based system clock (XIN/XOUT), 1.8–3.6 V supply range, key-on wakeup capability across 15 pins (D0–D7, E0–E2, G0–G3), RAM back-up mode (0.1 µA), and integrated voltage drop detection (1.5 V reset threshold).

Technical Context

The M34286G2GP#V2 implements a 72-instruction 4-bit CPU core with 4-level subroutine nesting and ALU-based arithmetic logic. Its dual-timer architecture enables precise IR carrier waveform generation: Timer 1 provides automatic carrier wave output control via CARR pin using its reload register, while Timer 2 generates the base carrier signal with two independent reload registers for flexible duty-cycle tuning.

System timing is derived from an external ceramic resonator connected to XIN/XOUT, with selectable instruction clocks (f(XIN)/4, f(XIN)/8, f(XIN)/16) and system clocks (f(XIN)/8, f(XIN), f(XIN)/2, f(XIN)/4). The device integrates power management features including power-on reset, watchdog timer (14-bit), and voltage drop detection circuit with programmable thresholds.

Key Specifications

Pinout & Package

Package: 20-pin plastic molded LSSOP (PLSP0020JB-A / 20P2F-A), 0.65 mm pitch, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit remote control microcontroller applications.

Compared with M34286G2GP#V2, the M34286G2GP#U offers identical functionality in a through-hole package for manual assembly or legacy systems, while the uPD78F0503GC-FAA-AX provides flash-based flexibility and modern toolchain support at higher cost and power - making M34286G2GP#V2 optimal for high-volume, cost-sensitive, fixed-function IR remotes.

Availability

M34286G2GP#V2 is available at Aetrix Electronics and suitable for infrared remote control transmitters, universal remote controllers, and smart home IR hubs requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for M34286G2GP#V2 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 automotive, industrial, and consumer markets.

The 4286 Group - including M34286G2GP#V2 - was engineered specifically for low-cost, low-power infrared remote control transmitters, emphasizing minimal external components, battery longevity, and hardware-accelerated IR timing functions.

FAQ

What is the maximum operating frequency supported by the M34286G2GP#V2 oscillator circuit?

The M34286G2GP#V2 supports a ceramic resonator up to 4.0 MHz on the XIN/XOUT pins, yielding a minimum instruction execution time of 2.0 µs when system clock is set to f(XIN)/2. Higher frequencies are not supported per the datasheet; exceeding 4.0 MHz may cause timing violations or oscillator instability in the M34286G2GP#V2.

Does the M34286G2GP#V2 support in-circuit programming or firmware updates?

No, the M34286G2GP#V2 uses mask ROM for program storage, meaning firmware is permanently programmed during wafer fabrication and cannot be modified post-manufacture. This design ensures cost efficiency and reliability for fixed-function remote control applications where M34286G2GP#V2 is deployed.

How does the key-on wakeup function work on the M34286G2GP#V2 I/O ports?

The M34286G2GP#V2 supports key-on wakeup on D0–D7, E0–E2, and G0–G3 (15 total pins) using internal pull-down transistors and H-level sensing. When the device is in RAM back-up mode, any transition from low to high on these pins triggers hardware wakeup - allowing M34286G2GP#V2 to resume operation within microseconds without polling.

Can the CARR pin of the M34286G2GP#V2 drive an IR LED directly?

No, the CARR pin of the M34286G2GP#V2 provides a CMOS-level logic output (not a high-current driver) and must interface with an external transistor or driver IC (e.g., NPN switch) to source sufficient current for standard IR LEDs. Direct connection risks insufficient radiant intensity and potential damage to the M34286G2GP#V2 output stage.

What is the purpose of the dual reload registers in Timer 2 of the M34286G2GP#V2?

Timer 2 in the M34286G2GP#V2 uses two independent 8-bit reload registers (R2H and R2L) to separately define high- and low-time intervals of the IR carrier waveform. This enables precise control of duty cycle (e.g., 25% or 33%) without software intervention - a critical feature for protocol compliance in M34286G2GP#V2-based remote transmitters.