NXP Semiconductors MC9S08QE64CFT

Overview

MC9S08QE64CFT from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 64 KB flash, 4 KB RAM, 48-pin QFN package, and integrated 24-channel 12-bit ADC - designed for automotive body control modules requiring low-power operation, LIN communication, and real-time sensor interfacing.

For engineers reviewing the MC9S08QE64CFT datasheet, MC9S08QE64CFT pinout, MC9S08QE64CFT application, or MC9S08QE64CFT equivalent, key selection criteria include its 48-QFN thermal performance (θJA = 26°C/W on 4-layer board), stop-mode wake-up time (6 μs), dual SCI/LIN support, and 1.8–3.6 V operating range with LVD thresholds at 1.82 V (low) and 2.16 V (high).

Technical Context

The MC9S08QE64CFT implements the HCS08 CPU core with BGND instruction support and up to 32 interrupt/reset sources. Its internal clock source (ICS) uses FLL control with factory-trimmed internal reference (±2% deviation, 0.2% resolution), enabling CPU frequencies from 2 MHz to 50.33 MHz depending on supply voltage and temperature.

System-level timing relies on multiple synchronized peripherals: a 6-channel TPM3 module plus two 3-channel TPMs (TPM1/TPM2), RTC with 1 kHz low-power oscillator, and dual IIC/SPI/SCI interfaces - all operable in stop3 mode with selective clock gating and external oscillator support.

Key Specifications

Pinout & Package

MC9S08QE64CFT is housed in a 48-pin QFN package (Case 1314, 7 mm²) with exposed thermal pad, compliant with JEDEC MO-220, and migrated to copper wire bonding per Freescale document 98ASA00466D.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S9KEAZN64ACLH and MC9S08AC60CFUE, the MC9S08QE64CFT delivers native LIN compliance, integrated RTC, and superior analog integration (24-channel ADC + dual ACMP) in a thermally optimized 48-QFN package - making it optimal for automotive body electronics where mixed-signal precision and protocol offload are critical.

Availability

MC9S08QE64CFT is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor nodes, smart lighting systems, and home appliance UI panels requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for MC9S08QE64CFT 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.

The MC9S08QE64CFT belongs to the HCS08-based QE series, engineered specifically for energy-efficient automotive body electronics with integrated LIN, robust analog front-ends, and ultra-low-power stop modes.

FAQ

What is the maximum CPU frequency supported by the MC9S08QE64CFT at 1.8 V?

The MC9S08QE64CFT supports up to 20 MHz CPU frequency when operating at 1.8 V across the full temperature range (–40°C to +85°C). This is specified in the MC9S08QE128 Series Data Sheet Rev. 7, Section "8-Bit HCS08 Central Processor Unit (CPU)". The frequency scales with supply voltage: 40 MHz above 2.1 V and 50.33 MHz above 2.4 V. The MC9S08QE64CFT maintains full functionality including ADC, TPM, and SCI at all supported frequencies.

Does the MC9S08QE64CFT support LIN 2.x communication natively?

Yes, the MC9S08QE64CFT supports LIN 2.0 and LIN 2.1 natively through its dual SCI modules. Each SCI provides LIN master extended break generation and LIN slave extended break detection, enabling direct implementation of LIN network nodes without external protocol assist hardware. The MC9S08QE64CFT's SCI modules also support wake-up on active edge and automatic baud rate detection - essential features for automotive LIN compliance. These capabilities are documented in the MC9S08QE128 Series Data Sheet Rev. 7.

What is the thermal resistance (θJA) of the MC9S08QE64CFT in its 48-pin QFN package?

The MC9S08QE64CFT in its 48-pin QFN package (Case 1314) has a junction-to-ambient thermal resistance (θJA) of 26°C/W when mounted on a four-layer PCB, and 81°C/W on a single-layer board, per Freescale Semiconductor's MC9S08QE128 Series Data Sheet Rev. 7, Table 5. This low θJA on multilayer boards enables reliable operation at full CPU speed (50.33 MHz) even in compact automotive enclosures. The exposed pad design and copper wire bonding (98ASA00466D) further enhance thermal performance.

Can the MC9S08QE64CFT operate in stop mode while maintaining RTC and ADC functionality?

Yes, the MC9S08QE64CFT supports full RTC operation and ADC conversions in stop3 mode. The RTC runs continuously using either the internal 1 kHz low-power oscillator or an external clock source, enabling precise time-of-day tracking and cyclic wake-up without external components. The ADC remains fully functional in stop3 mode with 2.5 μs conversion time and automatic compare capability. This capability is confirmed in the MC9S08QE128 Series Data Sheet Rev. 7 under "Power-Saving Modes" and "ADC" sections - and applies identically to the MC9S08QE64CFT as a derivative of the same series.

How many analog comparator channels does the MC9S08QE64CFT include, and what are their key features?

The MC9S08QE64CFT includes two analog comparators (ACMP1 and ACMP2). Each supports selectable interrupt on rising, falling, or both edges of the output; comparison against a fixed internal bandgap reference (1.17 V); and optional routing of outputs to TPM modules for event-triggered actions. Both comparators remain operational in stop3 mode. These features are detailed in the MC9S08QE128 Series Data Sheet Rev. 7 and apply to all derivatives including the MC9S08QE64CFT, as confirmed in the "MC9S08QE128 Series Comparison" table.