Renesas M37546G4HP#U0

Overview

M37546G4HP#U0 from Renesas Electronics is a single-chip 8-bit CMOS microcomputer in the 7546 Group, featuring QzROM, built-in power-on reset and low-voltage detection circuits, and 8K-byte ROM with 512-byte RAM. It integrates dual 8-bit and dual 16-bit timers, 6-channel 10-bit ADC, UART/clock-synchronous serial interfaces, and programmable I/O ports for embedded control applications including industrial sensors and appliance motor control.

For engineers reviewing the M37546G4HP#U0 datasheet, M37546G4HP#U0 pinout, M37546G4HP#U0 application, or M37546G4HP#U0 equivalent, key selection considerations include its 36-pin WQFN package (PWQN0036KA-A), 1.8–5.5 V supply range supporting on-chip oscillator operation, and pin-compatibility with the 7542 Group for legacy design migration.

Technical Context

The M37546G4HP#U0 implements a 740-family CPU core with 71 basic instructions and minimum 0.25 µs instruction execution time at 8 MHz in double-speed mode. Its memory architecture includes user-accessible ROM (8192 bytes), RAM (512 bytes), and function set ROM for peripheral initialization post-reset.

Peripheral integration includes two 8-bit timers (Timer 1 and Timer X), two 16-bit timers (Timer A and Timer B), 4-channel output compare, 2-channel input capture, and dual 8-bit serial I/O modules configurable as UART or clock-synchronous interfaces - all managed via dedicated SFR registers in the zero page.

Key Specifications

Pinout & Package

Package: PWQN0036KA-A - 36-pin plastic molded WQFN (0.5 mm pitch, 6 × 6 mm body).

Key Features

Applications

Equivalent & Alternatives

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

Compared with M37546G4HP#U0, the SP variant offers through-hole mounting flexibility while the GP variant aligns with mainstream LQFP assembly infrastructure - all three share identical instruction set, memory map, and peripheral register layout, enabling firmware reuse across packages.

Availability

M37546G4HP#U0 is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance motor control, energy meter front-ends, and smart thermostat controllers requiring stable component supply across extended product lifecycles.

Supply support for M37546G4HP#U0 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, and power devices for industrial, automotive, and IoT applications.

The 7546 Group was designed as a cost-optimized, pin-compatible upgrade to the 7542 Group, adding power-on reset, low-voltage detection, and function set ROM to simplify embedded control system development.

FAQ

What is the maximum oscillation frequency supported by the M37546G4HP#U0?

The M37546G4HP#U0 supports up to 8 MHz oscillation frequency in double-speed mode, delivering a minimum instruction execution time of 0.25 µs. This timing applies when using an external ceramic resonator or quartz crystal at 8 MHz; lower frequencies (6.5 MHz, 2 MHz, 1 MHz) extend the usable supply voltage range down to 2.2 V, enabling low-power operation. The M37546G4HP#U0 also supports RC and on-chip oscillator modes for reduced external component count.

Does the M37546G4HP#U0 include built-in reset and voltage monitoring functions?

Yes, the M37546G4HP#U0 integrates both a power-on reset (POR) circuit and a low-voltage detection (LVD) circuit. The POR ensures reliable initialization at power-up, while the LVD monitors VCC and can generate either an interrupt or a reset when voltage falls below a user-selectable threshold. These features eliminate the need for external reset supervisors in most industrial and consumer applications, simplifying design and reducing bill-of-materials cost for the M37546G4HP#U0.

How many analog-to-digital converter channels does the M37546G4HP#U0 provide, and what is their resolution?

The M37546G4HP#U0 provides six 10-bit analog-to-digital converter channels (AN0–AN5) mapped to P20–P25 pins. Conversion uses an external reference voltage applied to the VREF pin, enabling ratiometric measurements that maintain accuracy across supply voltage variations. The ADC supports single-ended input only and is synchronized to the internal clock, with conversion time dependent on selected prescaler settings - a key parameter for real-time control loops in the M37546G4HP#U0.

What package type is used for the M37546G4HP#U0, and what are its key mechanical characteristics?

The M37546G4HP#U0 uses the PWQN0036KA-A package: a 36-pin plastic molded WQFN with 0.5 mm pitch, 6 mm × 6 mm body size, and exposed thermal pad. This fine-pitch, space-efficient package supports high-density PCB layouts and improved thermal performance over SDIP or LQFP variants. Its lead-free construction complies with RoHS directives, and the package is specifically assigned to the "HP" suffix in the 7546 Group naming convention - confirming the M37546G4HP#U0's physical and thermal identity.

Is the M37546G4HP#U0 pin-compatible with other members of the 7546 Group?

Yes, the M37546G4HP#U0 is pin-compatible within its package family: all 36-pin WQFN variants (e.g., M37546G2HP#U0, M37546G4HP#U0) share identical pin assignments and electrical characteristics. However, it is not pin-compatible with 32-pin variants (SP/SDIP or GP/LQFP), though the full 7546 Group maintains functional and software compatibility with the 7542 Group. Firmware developed for the M37546G4HP#U0 will run unchanged on other 7546 Group devices sharing the same ROM/RAM configuration.