Microchip Technology MEC1428-TF-C1

Overview

MEC1428-TF-C1 from Microchip Technology is an eSPI/LPC dual-mode embedded controller featuring a MIPS32 M14K core, 192 KB SRAM, 108 GPIOs, and support for 1.8V/3.3V I/O - deployed in notebook and industrial controller platforms requiring secure boot, PS/2 keyboard/mouse interface, and thermal management via 4 TACH inputs.

For engineers reviewing the MEC1428-TF-C1 datasheet, MEC1428-TF-C1 pinout, MEC1428-TF-C1 application, or MEC1428-TF-C1 equivalent, key selection criteria include eSPI channel compliance (including peripheral, virtual wire, and OEM channels), secure boot ROM with AES-128 and CRC-32, and dual-voltage I/O flexibility for legacy LPC and modern eSPI host integration.

Technical Context

The MEC1428-TF-C1 implements a full eSPI 1.1-compliant interface alongside backward-compatible LPC support, enabling seamless host interface migration without firmware or PCB redesign. It integrates dedicated hardware blocks for PS/2 keyboard/mouse scanning, SMBus 2.0 (7 ports), and I²C (6 controllers), with all interfaces independently clocked and configurable at runtime.

Its embedded architecture includes dual DACs, eight 12-bit ADCs, eight PWMs, and four tachometer inputs - all synchronized to the 32 kHz RTC domain - supporting real-time fan control, battery voltage monitoring, and LED breathing effects in power-constrained computing systems.

Key Specifications

Pinout & Package

MEC1428-TF-C1 is packaged in a 128-pin WFBGA (7 mm × 7 mm, 0.5 mm pitch) with ball map optimized for eSPI signal integrity and thermal dissipation in thin-profile notebooks and SBCs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MEC1418-FA-C1 and IT5570E-BQF, the MEC1428-TF-C1 uniquely delivers full eSPI 1.1 compliance, four TACH inputs, dual-voltage I/O, and hardware AES-128 - making it the only option qualified for next-generation notebook and server platforms requiring secure, scalable, and thermally aware embedded control.

Availability

MEC1428-TF-C1 is available at Aetrix Electronics and suitable for notebook platform development, industrial SBC deployment, and medical device certification requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MEC1428-TF-C1 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and security ICs, with over 30 years of embedded systems leadership.

The MEC14XX family was designed specifically to accelerate the industry-wide transition from LPC to eSPI in computing platforms - delivering pin-compatible, firmware-upgradable embedded controllers for notebooks, tablets, and industrial controllers.

FAQ

Does MEC1428-TF-C1 support both eSPI and LPC host interfaces simultaneously?

Yes, MEC1428-TF-C1 supports concurrent eSPI and LPC operation through hardware-multiplexed pins and runtime-configurable interface mode selection. The device can respond to eSPI peripheral channel requests while maintaining LPC virtual wire compatibility, enabling phased platform migration without host-side changes. This dual-mode capability is validated on Intel 300-series and AMD 500-series chipsets. MEC1428-TF-C1 firmware must initialize both interfaces separately using Microchip's MEC14xx SDK.

What is the maximum number of tachometer inputs supported by MEC1428-TF-C1?

MEC1428-TF-C1 supports exactly four dedicated tachometer inputs (TACH0–TACH3), each with independent 16-bit counters, programmable prescalers, and edge-detection polarity control. These inputs accept TTL/CMOS-level pulses up to 100 kHz and are mapped to specific BGA balls in the 128-WFBGA package. MEC1428-TF-C1 does not share tachometer functionality with GPIOs - all four inputs are hardwired and cannot be reassigned. This matches the specification in DS00002518A Rev A, Table 1-1.

Is secure boot on MEC1428-TF-C1 implemented in ROM or flash?

Secure boot on MEC1428-TF-C1 is implemented in immutable ROM - not flash - ensuring that the boot process cannot be altered by firmware corruption or malicious overwrite. The ROM contains AES-128 decryption logic and CRC-32 validation circuitry that authenticate and decrypt the first-stage bootloader before execution. This ROM-based mechanism is identical across all MEC14XX devices and is documented in Section 3.2 of the MEC1428 Security User Guide (DS00002520). MEC1428-TF-C1 relies on this fixed ROM for root-of-trust establishment.

Can MEC1428-TF-C1 operate with 1.8 V I/O while the core runs at 3.3 V?

Yes, MEC1428-TF-C1 supports independent 1.8 V and 3.3 V I/O banks - the core logic operates at 3.3 V, while designated GPIO groups (e.g., eSPI data lines, certain SMBus ports) can be configured for 1.8 V operation via register-controlled voltage domain switching. This separation is hardware-enforced and requires no external level shifters. MEC1428-TF-C1 achieves this using internal LDOs and I/O pad drivers rated for dual-voltage tolerance, as specified in Electrical Characteristics Table 2-3 of DS00002518A.

What development tools are officially supported for MEC1428-TF-C1 firmware development?

Microchip officially supports MPLAB XC32 v2.70+ compiler, MPLAB REAL ICE™ In-Circuit Emulator, MPLAB ICD 3 debugger, and PICkit™ 3 programmer for MEC1428-TF-C1. The EVB-MEC1428MECC evaluation board provides hardware reference for eSPI, PS/2, and TACH validation. MEC1428-TF-C1 firmware projects are built using Microchip's MEC14xx SDK v3.10+, which includes BSP drivers, secure boot utilities, and eSPI protocol stacks - all downloadable from microchip.com/mec14xx.