Microchip Technology MEC1521H-B0-I/2MW

Overview

MEC1521H-B0-I/2MW from Microchip Technology is a low-power ARM® Cortex-M4 embedded controller for notebook PC ACPI-compliant embedded control, featuring 256 KB SRAM (224 KB code + 32 KB data), eSPI host interface compliant with Intel eSPI Spec v1.0.MEC152x, and support for all five ACPI power states (S0–S5) with light/heavy sleep modes. It operates at 3.3 V or 1.8 V across –40 °C to +85 °C.

For engineers reviewing the MEC1521H-B0-I/2MW datasheet, MEC1521H-B0-I/2MW pinout, MEC1521H-B0-I/2MW application, or MEC1521H-B0-I/2MW equivalent, key selection criteria include eSPI slave compatibility, secure boot via ECDSA p-384/SHA-384, RTC/week timer wake capability, and 128-pin VTQFP/WFBGA package constraints in space-constrained laptop EC designs.

Technical Context

The MEC1521H-B0-I/2MW implements an ARM Cortex-M4 core running up to 48 MHz with NVIC supporting 8 priority levels and hardware interrupt aggregation. Its eSPI interface supports all four channels-Peripheral, Virtual Wires, OOB Tunneled Message, and Run-time Flash Access-at up to 66 MHz, with Master Attached Flash Sharing (MAFS) and Slave Attached Flash Sharing (SAFS) security enforcement.

It integrates dual 32-bit auto-reloading timers, six 32-bit input capture registers, nine PWM outputs, four fan tachometer inputs, and a battery-backed RTC with week timer and hibernation timer-all operational in heavy sleep mode. The device uses two separate IO voltage domains (1.8 V/3.3 V) and includes 5 SMBus/I²C controllers with 15 configurable ports and full crossbar routing.

Key Specifications

Pinout & Package

MEC1521H-B0-I/2MW is available in a 128-pin VTQFP package (7 mm × 7 mm, 0.4 mm pitch) and a 128-pin WFBGA package (6 mm × 6 mm, 0.4 mm pitch). Pin functions are defined per DS00003427F, Table 2-1 (Pin Configuration).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MEC1521H-B0-I/2MW, MEC1521H-B0-I/SZ offers identical functionality with alternate factory configuration, while IT5570E-128 provides reduced security and power management capability - making MEC1521H-B0-I/2MW the only option supporting hardware-enforced flash region locking and S0ix wake responsiveness in modern thin-and-light notebooks.

Availability

MEC1521H-B0-I/2MW is available at Aetrix Electronics and suitable for notebook PC thermal management, ACPI power state control, and embedded keyboard controller applications requiring stable component supply, long-term lifecycle assurance, and secure boot validation.

Supply support for MEC1521H-B0-I/2MW 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

Microchip Technology Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and security ICs for industrial, automotive, and computing markets.

The MEC152x product line delivers highly configurable, low-power embedded controllers optimized for Windows- and Linux-based notebook platforms requiring Intel eSPI compliance, ACPI power governance, and hardware-rooted firmware security.

FAQ

What is the maximum operating frequency of the ARM Cortex-M4 core in the MEC1521H-B0-I/2MW?

The MEC1521H-B0-I/2MW integrates an ARM Cortex-M4 processor core with a programmable clock frequency up to 48 MHz. This maximum frequency is achieved using the internal 48 MHz PLL and is fully supported across the specified operating temperature range of –40 °C to +85 °C. The MEC1521H-B0-I/2MW core executes fixed-point instructions within a single 4 GB addressing space and includes a nested vectored interrupt controller (NVIC) with eight priority levels.

Does the MEC1521H-B0-I/2MW support Intel eSPI Slave Attached Flash Sharing (SAFS)?

Yes, the MEC1521H-B0-I/2MW supports Slave Attached Flash Sharing (SAFS) via dedicated hardware logic that enforces region-based protection and locking. This SAFS bridge restricts access to designated SPI flash memory regions based on master identity (e.g., BIOS, ME, or MEC1521H-B0-I/2MW itself), ensuring secure firmware partitioning. SAFS operation is defined in Intel eSPI Compatibility Spec #562633 Rev 0.6 and is fully implemented in the MEC1521H-B0-I/2MW silicon.

What package options are available for the MEC1521H-B0-I/2MW?

The MEC1521H-B0-I/2MW is offered in two package variants: a 128-pin VTQFP (7 mm × 7 mm, 0.4 mm pitch) and a 128-pin WFBGA (6 mm × 6 mm, 0.4 mm pitch). Both packages share identical pinout and electrical characteristics per DS00003427F, Table 2-1. The "2MW" suffix denotes a specific factory configuration and traceability marking applied to these 128-pin variants, distinguishing them from other MEC1521 family members like the 144-pin WFBGA versions.

How does the MEC1521H-B0-I/2MW implement secure boot?

The MEC1521H-B0-I/2MW implements secure boot using a hardware root of trust (RoT) anchored in its Boot ROM. During power-on, the secure boot loader authenticates the external SPI flash firmware image using ECDSA p-384 signatures and SHA-384 hashes, optionally decrypts it with AES-256, and enforces rollback protection across up to 128 firmware revisions. Keys are stored in lockable OTP, and the MEC1521H-B0-I/2MW supports dual-image redundancy with automatic fallback on signature failure.

Can the MEC1521H-B0-I/2MW operate in connected standby (S0ix) mode?

Yes, the MEC1521H-B0-I/2MW is explicitly designed to support connected standby (S0ix) operation. Its light sleep and heavy sleep modes maintain full functionality of the RTC, week timer, hibernation timer, GPIO wake detection, and eSPI virtual wire monitoring - enabling sub-100 µs wake latency from any eSPI command or configured event. This capability is verified across the full –40 °C to +85 °C operating range and is integral to the MEC1521H-B0-I/2MW's role in modern Windows-based ultrabook platforms.