Microchip Technology CEC1712H-S2-I/SX

Overview

CEC1712H-S2-I/SX from Microchip Technology is a cryptographic embedded controller featuring an ARM® Cortex-M4 core running up to 48 MHz, 256 KB SRAM (224 KB code + 32 KB data), dual-voltage I/O (1.8 V/3.3 V), and hardware-accelerated crypto engines for AES-256, ECDSA P-384, SHA-384, RSA up to 4096-bit, and TRNG. It serves as a secure, low-power EC in PC platform power management and firmware integrity enforcement.

For engineers reviewing the CEC1712H-S2-I/SX datasheet, CEC1712H-S2-I/SX pinout, CEC1712H-S2-I/SX application, or CEC1712H-S2-I/SX equivalent, key selection criteria include secure boot with immutable ROM, battery-backed RTC and timers, 5 SMBus/I²C controllers, 6 PWM outputs, and 84-pin WFBGA packaging compatible with ACPI-compliant system management.

Technical Context

The CEC1712H-S2-I/SX integrates a fixed-point ARM Cortex-M4 processor with tightly coupled memory, nested vectored interrupt controller (NVIC) supporting 8 priority levels, and EC interrupt aggregator to consolidate external wake sources. Its clock architecture includes a 48 MHz internal PLL and dual 32 kHz sources (internal oscillator + external crystal).

Security is implemented at silicon level via Boot ROM Secure Boot Loader using ECDSA P-384 and SHA-384, AES-256 encrypted SPI Flash support, DICE-compliant attestation, and lockable 288-byte OTP for keys. All cryptographic operations are offloaded to dedicated hardware engines - AES, public-key (RSA/ECC), hash (SHA-1 to SHA-512), and TRNG - enabling runtime API access without CPU overhead.

Key Specifications

Pinout & Package

CEC1712H-S2-I/SX is housed in an 84-pin Wafer-Level Fine-Pitch Ball Grid Array (WFBGA) package measuring 5.0 mm × 5.0 mm with 0.5 mm ball pitch. The package supports both 1.8 V and 3.3 V I/O rails, with dedicated VTR1/VTR2, VBAT, and analog power domains. All GPIO pins feature glitch protection, under-voltage protection, and over-voltage tolerance (up to 3.63 V on 1.8 V pads, 5.5 V on 3.3 V pads).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CEC1712H-S2-I/SX, the CEC1702-I/SX offers identical security primitives but omits critical platform-timing peripherals, while the STM32L562VEY6Q provides broader MCU flexibility at the expense of integrated EC functionality - making CEC1712H-S2-I/SX the only option supporting full ACPI compliance, VBAT-powered subsystems, and native SMBus host control in a single die.

Availability

CEC1712H-S2-I/SX is available at Aetrix Electronics and suitable for laptop power management, desktop platform control, server baseboard management, and industrial thin client applications requiring stable component supply, long-term lifecycle support, and cryptographic assurance.

Supply support for CEC1712H-S2-I/SX 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 leading provider of microcontrollers, analog components, FPGAs, and security ICs, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.

The CEC1712H-S2-I/SX belongs to Microchip's Cryptographic Embedded Controller product line, engineered specifically for secure, low-power system management in PC, server, and industrial platforms requiring hardware-enforced firmware integrity and ACPI-compliant power orchestration.

FAQ

What is the primary function of the CEC1712H-S2-I/SX in a computing platform?

The CEC1712H-S2-I/SX serves as a cryptographic embedded controller responsible for secure boot, platform power management, thermal monitoring, and peripheral control in laptops, desktops, and servers. Its ARM Cortex-M4 core executes EC firmware validated by hardware-accelerated ECDSA P-384 and SHA-384, while its VBAT-powered RTC, hibernation timers, and SMBus controllers enable full ACPI compliance. The CEC1712H-S2-I/SX is designed to replace legacy ECs with enhanced security and lower power consumption.

Does the CEC1712H-S2-I/SX support both 1.8 V and 3.3 V I/O interfaces simultaneously?

Yes, the CEC1712H-S2-I/SX features two separate configurable I/O voltage regions - one for 1.8 V operation and another for 3.3 V - allowing simultaneous interfacing with modern platform controller hubs and legacy peripherals without external level shifters. Each region supports programmable drive strength (2 mA to 12 mA), automatic pull-up/pull-down disable during output drive, and over-voltage tolerance (3.63 V on 1.8 V pads, 5.5 V on 3.3 V pads). This dual-voltage capability is confirmed in the DS00003416A datasheet Section 1.0.

How does the secure boot process work on the CEC1712H-S2-I/SX?

The CEC1712H-S2-I/SX implements secure boot via its Boot ROM, which authenticates the primary SPI Flash image using ECDSA P-384 signatures and SHA-384 hashes before loading into SRAM. It supports fallback image validation, AES-256 decryption of encrypted firmware, key revocation, rollback protection, and DICE-compliant attestation. Private keys are stored in lockable OTP (288 bytes), and the JTAG interface is disabled by default. This entire flow is enforced in hardware, ensuring immutable code execution from power-on reset - a core requirement verified in DS00003416A Sections 1.0 and 30.0.

What peripheral interfaces are available on the CEC1712H-S2-I/SX for sensor and actuator control?

The CEC1712H-S2-I/SX provides 5 SMBus/I²C controllers (with 10 configurable ports via crossbar), 3 NS16C550A-compatible UARTs, 6 PWM outputs, 2 tachometer inputs, 5-channel 10/12-bit ADC, and 68 GPIOs - including 8 over-voltage tolerant pins and 2 breathing LED drivers. These interfaces enable direct connection to thermal sensors (via ADC or SMBus), fans (PWM + TACH), buttons (GPIO with edge-detect wake), and status LEDs (breathing PWM). All are operational in standby power mode, as documented in DS00003416A Sections 11.0, 21.0, and 22.0.

Is the CEC1712H-S2-I/SX pin-compatible with other members of the CEC17xx family?

No, the CEC1712H-S2-I/SX is not pin-compatible with other CEC17xx variants such as CEC1702-I/SX, which uses a 64-pin WFBGA package. The CEC1712H-S2-I/SX exclusively uses an 84-pin WFBGA (5.0 × 5.0 mm) with a unique ball map defined in DS00003416A Table 2-1. While functional overlap exists in CPU architecture and crypto engines, differences in GPIO count, peripheral mapping (e.g., hibernation timer presence), and power rail assignments prevent mechanical or electrical drop-in replacement. Pin compatibility must be verified per datasheet package drawings.