Renesas M37534E8FP#U1

Overview

M37534E8FP#U1 from Renesas Electronics (formerly Mitsubishi Electric) is an 8-bit CMOS microcomputer based on the 740-family core, featuring integrated USB 1.1 Low-Speed interface, 10-bit 8-channel A/D converter, three 8-bit timers, and 16 KB ROM/384 B RAM in a 36-pin SOP package. It targets USB-connected PC peripheral input devices such as keyboards, mice, and game controllers requiring embedded USB device functionality with analog sensing and LED drive capability.

For engineers reviewing the M37534E8FP#U1 datasheet, M37534E8FP#U1 pinout, M37534E8FP#U1 application, or M37534E8FP#U1 equivalent, this page delivers verified technical context, exact pin functions for the 36P2R-A package, USB timing and voltage compliance details, real-world use cases in HID-class peripherals, and two validated alternative parts with documented functional and packaging differences.

Technical Context

The M37534E8FP#U1 implements a fixed-function USB 1.1 Low-Speed transceiver with integrated 3.3 V regulator and USBVREFOUT pin for D- line pull-up, supporting only host-initiated enumeration and IN/OUT/SETUP token handling - no USB host mode or high-speed operation. Its clock system combines an on-chip oscillator for reset startup and external ceramic resonator (XIN/XOUT) for stable 6 MHz operation, with programmable CPU clock division (1×, 2×, or 8×).

Interrupt handling supports 14 sources across 8 vectors, including USB-specific tokens (IN, SETUP/OUT, Reset/Suspend/Resume), dual external interrupts (INT0/INT1), timer underflows, A/D conversion completion, and key-on wake-up via P0 pins. The A/D converter operates at 10-bit resolution with selectable reference (VREF or Vcc) and supports sequential scanning of up to 8 channels without CPU intervention.

Key Specifications

Pinout & Package

Package: 36P2R-A - 36-pin plastic molded SOP with 0.8 mm pitch, JEDEC MS-012AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M37534E8FP#U1, the R5F57534M4FP#U0 offers identical footprint and USB functionality but halves usable ROM, while the HD64F3687FPV trades integration for scalability and Flash flexibility - making M37534E8FP#U1 optimal for cost-constrained, space-limited USB HID designs needing guaranteed 16 KB code space.

Availability

M37534E8FP#U1 is available at Aetrix Electronics and suitable for USB human interface device (HID) controllers, industrial keypad interfaces, and embedded sensor hubs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for M37534E8FP#U1 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, formed from the merger of NEC Electronics and Renesas Technology, is a global semiconductor leader specializing in microcontrollers, analog, and power solutions for automotive, industrial, and IoT markets.

The 7534 Group was designed specifically for low-cost, single-chip USB peripheral controllers targeting PC input devices - integrating USB transceiver, A/D, timers, and LED drive into one 36-pin package to replace multi-chip legacy solutions.

FAQ

What USB specification does the M37534E8FP#U1 support?

The M37534E8FP#U1 supports USB Specification Rev. 1.1 Low-Speed mode only (1.5 Mbps). It implements a fixed-function USB device controller with built-in transceiver and 3.3 V regulator, but does not support Full-Speed (12 Mbps), USB host mode, or USB On-The-Go. Enumeration relies on the USBVREFOUT pin driving an external 1.5 kΩ pull-up resistor on D-.

Does the M37534E8FP#U1 require an external crystal or can it run from its internal oscillator?

The M37534E8FP#U1 starts operation using its internal oscillator after reset, but must switch to an external 6 MHz ceramic resonator (connected between XIN and XOUT) for stable USB timing compliance. The internal oscillator alone does not meet USB Low-Speed jitter requirements; the datasheet mandates external resonator use during USB operation.

How many analog input channels does the M37534E8FP#U1 support, and what is their resolution?

The M37534E8FP#U1 supports eight analog input channels (AN0 through AN7) mapped to pins P20–P27, with a resolution of 10 bits. Conversion is software- or timer-triggered, and the reference voltage can be selected between the external VREF pin or Vcc via the A/D control register (ADCON).

Can the M37534E8FP#U1 drive LEDs directly, and which pins support this function?

Yes, the M37534E8FP#U1 can drive LEDs directly using pins P30 through P35, which are designated as high-current sink outputs capable of ≥10 mA per pin. These pins are configured as outputs via the P3 direction register (P3D) and support common-anode LED connections without external driver transistors.

What is the maximum operating frequency and instruction execution speed of the M37534E8FP#U1?

The M37534E8FP#U1 operates at a maximum external clock frequency of 6 MHz (XIN), yielding a CPU clock of 6 MHz in double-speed mode. Its shortest instruction executes in 0.34 µs - corresponding to 2.94 million instructions per second (MIPS) - confirmed for the 6 MHz oscillation condition specified in the datasheet.