NXP Semiconductors MC908EY16ACFJE

Overview

MC908EY16ACFJE from Freescale Semiconductor is a 8-bit M68HC08 core microcontroller with 16 KB on-chip FLASH, 512 B RAM, and integrated peripherals including ADC10 (10-bit, 8-channel), BEMF counter, ESCI, SPI, dual TIMA/TIMB timers, and ICG clock generator. It operates from 2.7–5.5 V, supports -40°C to +125°C industrial temperature range, and targets motor control, appliance timing, and embedded sensor interface applications.

For engineers reviewing the MC908EY16ACFJE datasheet, MC908EY16ACFJE pinout, MC908EY16ACFJE application, or MC908EY16ACFJE equivalent, key selection factors include its FLASH security byte validation logic ($FFF6–$FFFD), trimmed internal oscillator accuracy (±2% over temperature), 10-bit ADC with programmable sample time, and dedicated BEMF counter for brushless DC motor commutation.

Technical Context

The MC908EY16ACFJE implements the M68HC08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing modes. Its Internal Clock Generator (ICG) integrates a digitally controlled oscillator (DCO), modulo-N divider, frequency comparator, and digital loop filter to achieve stable internal clock operation without external crystal in many configurations.

Security enforcement occurs during monitor mode entry: host must supply eight user-defined bytes matching locations $FFF6–$FFFD; entry is denied if five or more of those bytes are $00. The device includes dedicated hardware modules - BEMF counter for back-EMF zero-crossing detection, ESCI for asynchronous serial communication, and dual 16-bit timer interfaces (TIMA/TIMB) with input capture and output compare capability.

Key Specifications

Pinout & Package

MC908EY16ACFJE is housed in a 64-pin QFP (Quad Flat Package) with 0.5 mm pitch, JEDEC MS-026 compliant footprint. Thermal pad exposed on underside for enhanced heat dissipation in high-duty-cycle motor control use cases.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908EY16AFJE and MC908EY8ACFJE, the MC908EY16ACFJE uniquely delivers extended temperature operation plus dedicated BEMF hardware - enabling robust sensorless motor control in thermally demanding environments without added components or firmware overhead.

Availability

MC908EY16ACFJE is available at Aetrix Electronics and suitable for motor control systems, industrial appliance controllers, automotive body electronics, and sensor interface hubs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC908EY16ACFJE 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

Freescale Semiconductor (now part of NXP Semiconductors) designed high-reliability microcontrollers for automotive, industrial, and consumer applications before its 2015 acquisition.

The MC68HC908EY16A product line was engineered specifically for cost-sensitive, thermally demanding embedded control tasks - emphasizing integrated analog peripherals, FLASH security, and robust clocking for motor and appliance applications.

FAQ

What is the maximum operating temperature specification for the MC908EY16ACFJE?

The MC908EY16ACFJE is rated for continuous operation from -40°C to +125°C ambient temperature. This extended range is confirmed in Revision 2 of the datasheet (September 2010), where the maximum temperature specification was updated from 135°C to 125°C across all electrical characteristics tables, including DC parameters, oscillator behavior, and memory retention.

Does the MC908EY16ACFJE include hardware support for brushless DC motor commutation?

Yes, the MC908EY16ACFJE integrates a dedicated BEMF Counter Module (BEMF) that detects back-EMF zero-crossing events in real time. This hardware accelerator eliminates the need for external comparators and RC networks, enabling reliable sensorless commutation in BLDC motors - a key feature distinguishing it from lower-tier variants like the MC908EY8ACFJE.

How does FLASH security work on the MC908EY16ACFJE during monitor mode entry?

The MC908EY16ACFJE enforces FLASH security by requiring the host to transmit eight bytes matching the user-defined values stored at memory locations $FFF6–$FFFD. Monitor mode entry is denied if five or more of those bytes equal $00 - an improvement introduced in the May 2012 Addendum to prevent blank-security bypass attempts.

What oscillator options does the MC908EY16ACFJE support?

The MC908EY16ACFJE supports three clock sources: (1) internal digitally controlled oscillator (DCO) with factory-trimmed accuracy, (2) external crystal/resonator (1–8 MHz) connected to PTC4/OSC1 and PTC3/OSC2, and (3) external CMOS clock input applied to PTC3/OSC2 when EXTCLKEN is set. All sources are selectable via the ICG control register.

Is the MC908EY16ACFJE pin-compatible with other members of the 908EY family?

Yes, the MC908EY16ACFJE shares the same 64-pin QFP package and pin assignment with MC908EY16AFJE and MC908EY8ACFJE. Pin functions - including ADC inputs (PTB7–PTB0), tachometer inputs (PTD1/PTD0), and BEMF-capable pins - are identical across these variants, enabling drop-in replacement where FLASH size and temperature grade permit.