Microchip Technology CEC1712H-B2-I/SX

Overview

CEC1712H-B2-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-B2-I/SX datasheet, CEC1712H-B2-I/SX pinout, CEC1712H-B2-I/SX application, or CEC1712H-B2-I/SX equivalent, key selection criteria include secure boot with immutable ROM, battery-backed RTC and hibernation timers, 5 SMBus/I²C controllers with full crossbar, 6 PWM outputs, and 84-pin WFBGA packaging compatible with modern laptop and desktop motherboard layouts.

Technical Context

The CEC1712H-B2-I/SX implements a tightly coupled ARM Cortex-M4 subsystem with dedicated ITCM and DTCM memory regions, integrated EC interrupt aggregator supporting 5 ACPI power states, and hierarchical sleep architecture including Light/Heavy Sleep modes with sub-10 µA standby current. Its clock system combines a 48 MHz internal PLL with dual 32 kHz sources (internal oscillator + external crystal).

Security is enforced via Boot ROM–based secure loader that validates SPI Flash images using ECDSA P-384 signatures and SHA-384 hashes before execution, while hardware crypto engines offload symmetric (AES), asymmetric (RSA/ECC), and hashing (SHA-1 to SHA-512) operations - all accessible through runtime APIs in ROM. OTP (288 bytes) supports lockable key storage with 32-byte granularity.

Key Specifications

Pinout & Package

CEC1712H-B2-I/SX is housed in an 84-pin WFBGA package (5.0 × 5.0 mm, 0.5 mm pitch) with dual I/O voltage domains (1.8 V / 3.3 V), full glitch and under-voltage protection on all GPIOs, and 8 over-voltage tolerant pads rated for 3.63 V (1.8 V rail) or 5.5 V (3.3 V rail).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CEC1712H-B2-I/SX, the CEC1702H-B2-I/SX reduces memory and timer capability for lower cost, while the STM32L562VE trades EC-specific hardware (PWROK, VCI, SMBus host) for broader MCU flexibility - neither offers pin-compatible or functional drop-in replacement.

Availability

CEC1712H-B2-I/SX is available at Aetrix Electronics and suitable for laptop platform power management, desktop motherboard EC integration, and industrial HMI control requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for CEC1712H-B2-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, and security solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The CEC1712H-B2-I/SX belongs to Microchip's Cryptographic Embedded Controller product line, engineered specifically for secure, low-power platform management in PC-class and industrial systems requiring hardware-rooted trust and ACPI-compliant power orchestration.

FAQ

What is the primary function of the CEC1712H-B2-I/SX in a computing platform?

The CEC1712H-B2-I/SX functions as a cryptographic embedded controller responsible for secure boot validation, ACPI power-state coordination (S0–S5), platform power sequencing, and real-time peripheral management. Its ARM Cortex-M4 core executes firmware that authenticates SPI Flash images using ECDSA P-384 and SHA-384 before loading, ensuring only signed code runs - making CEC1712H-B2-I/SX essential for establishing hardware-rooted trust in laptops and desktops.

Does the CEC1712H-B2-I/SX support both 1.8 V and 3.3 V I/O interfaces simultaneously?

Yes, the CEC1712H-B2-I/SX features two separate, configurable I/O voltage domains - one for 1.8 V and another for 3.3 V operation - allowing simultaneous interfacing with modern low-voltage PCHs and legacy 3.3 V peripherals. Each domain supports programmable drive strength (2 mA to 12 mA), pull-up/down control, and glitch/under-voltage protection, and the CEC1712H-B2-I/SX maintains full functionality across both rails without external level shifters.

How does the secure boot process work on the CEC1712H-B2-I/SX?

Upon reset, the CEC1712H-B2-I/SX executes Boot ROM code that loads and verifies the primary firmware image from external SPI Flash. Verification uses hardware-accelerated ECDSA P-384 signatures and SHA-384 hashes stored in OTP or external storage. If validation passes, the image is loaded into SRAM and executed; if it fails, the CEC1712H-B2-I/SX attempts fallback image loading or halts. AES-256 encryption of SPI Flash contents is also supported, and key revocation and roll-back protection are enforced - all within the immutable Boot ROM of CEC1712H-B2-I/SX.

Can the CEC1712H-B2-I/SX operate independently during system hibernation?

Yes, the CEC1712H-B2-I/SX maintains full functionality during hibernation using its VBAT supply. The RTC, two hibernation timers, week timer, VCI inputs, and battery-backed 64 B SRAM remain active - enabling precise wake scheduling (down to 0.5 ms resolution) and power-event detection even when main VTR rails are off. This autonomous operation is central to the CEC1712H-B2-I/SX role in managing low-power states without host CPU involvement.

What debugging interfaces are available on the CEC1712H-B2-I/SX?

The CEC1712H-B2-I/SX provides three standardized debug interfaces: a 4-pin JTAG port for boundary scan and full-chip debug, a 2-pin Serial Wire Debug (SWD) interface for streamlined firmware development, and a Trace FIFO Debug Port (TFDP) supporting real-time instruction and data trace. All interfaces are accessible via dedicated pins (e.g., JTAG_TDI/TDO/TMS/TCK, SWDIO/SWCLK, TFDP_CLK/DATA), and JTAG is disabled by default - enhancing security unless explicitly enabled via OTP configuration in CEC1712H-B2-I/SX.