MC9S08AC32MPUE - 32KB Flash 8-bit MCU 40MHz LQFP-64 | NXP
MPN: MC9S08AC32MPUE ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.85 | $78.50 |
| 100 | $6.94 | $694.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.42 | $5,420.00 |
MC9S08AC32MPUE Overview
Background: An 8-bit microcontroller (MCU) is a single-chip processor integrating CPU core, program memory (Flash/ROM), data RAM, and peripherals optimized for embedded control. The HCS08 family is NXP's (formerly Freescale) enhanced 8-bit architecture, succeeding the HC08 with improved instruction set, lower power, and faster Flash programming. Within the broader taxonomy, 8-bit MCUs belong to microcontrollers -> embedded processors -> semiconductors. They remain the workhorse for cost-sensitive, deterministic real-time tasks in appliances, sensor interfaces, and automotive body electronics where 32-bit overhead is unjustified.
Key features of the MC9S08AC32MPUE include 32KB Flash (with security), 2KB RAM, multiple timers (TPM, RTC), 10-bit ADC, SCI/SPI/I2C communication modules, internal oscillator, and on-chip voltage regulator with brown-out detection. A JTAG/BDM debug interface supports in-circuit programming and development.
Typical applications for the MC9S08AC32MPUE span automotive body controllers, industrial sensor nodes, HVAC control boards, small appliance controllers, and lighting modules. Its pin-compatibility with other Flexis AC family members enables upward migration to 32-bit ColdFire devices on the same PCB layout.
When designing with this part, allocate sufficient decoupling (100nF + bulk) near the supply pins and follow NXP AN2143 for EMC best practices, as the AC family targets harsh automotive environments where ESD and conducted immunity compliance is mandatory.
Drop-in alternatives for MC9S08AC32MPUE — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MC9S08AC32MPUE (same form factor and footprint) — differing in Mounting Type, Package, RAM, ADC Resolution, Debug Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S08AC60CPUE
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View Datasheet →MC9S08AW32CPUE
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$6.1 / Unit
View Datasheet →SCS8AC60EACFUE
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View Datasheet →MC9S08AC32MPUE Maximum Ratings & Electrical Characteristics
| Core Architecture | HCS08 (S08 core, 8-bit CISC) |
| CPU Clock Speed | 40 MHz (up to 40 MIPS) |
| Program Memory (Flash) | 32 KB |
| RAM | 2 KB |
| Supply Voltage Range | 2.7 V to 5.5 V |
| I/O Pins | 38 |
| Package | 64-LQFP (10x10 mm) |
| Operating Temperature Range | -40C to +85C (industrial) |
| ADC | 10-bit, multi-channel |
| Communication Interfaces | I2C, SCI (UART), SPI |
| Timers/PWM | TPM modules with PWM |
| Debug Interface | Background Debug Mode (BDM) |
| Internal Oscillator | Yes |
| Mounting Type | Surface Mount (LQFP) |
| RoHS Compliance | RoHS Compliant |
MC9S08AC32MPUE Pin Configuration
| Pin 1 | PTA0/KBIP0/ADP0 — General I/O, keyboard interrupt, ADC input |
| Pin 2 | PTA1/KBIP1/ADP1 — General I/O, keyboard interrupt, ADC input |
| Pin 3 | PTA2/KBIP2/ADP2 — General I/O, keyboard interrupt, ADC input |
| Pin 4 | PTA3/KBIP3/ADP3 — General I/O, keyboard interrupt, ADC input |
| Pin 5 | PTA4/KBIP4/ADP4 — General I/O, keyboard interrupt, ADC input |
| Pin 6 | PTA5/KBIP5/ADP5 — General I/O, keyboard interrupt, ADC input |
| Pin 7 | PTA6/KBIP6/ADP6 — General I/O, keyboard interrupt, ADC input |
| Pin 8 | PTA7/KBIP7/ADP7 — General I/O, keyboard interrupt, ADC input |
| Pin 9 | PTB0/TPM1CH0/SS — PWM channel, SPI slave select |
| Pin 10 | PTB1/TPM1CH1/MISO — PWM channel, SPI MISO |
| Pin 11 | PTB2/TPM1CH2/MOSI — PWM channel, SPI MOSI |
| Pin 12 | PTB3/TPM1CH3/SPSCK — PWM channel, SPI clock |
| Pin 13 | VSS — Ground |
| Pin 14 | VDD — Supply voltage (2.7V to 5.5V) |
| Pin 15 | PTC0/TxD1 — UART transmit / GPIO |
| Pin 16 | PTC1/RxD1 — UART receive / GPIO |
| Pin 17 | PTC2/SDA1 — I2C SDA / GPIO |
| Pin 18 | PTC3/SCL1 — I2C SCL / GPIO |
| Pin 19 | PTC4 — GPIO |
| Pin 20 | PTC5 — GPIO |
| Pin 21 | PTC6 — GPIO |
| Pin 22 | PTC7 — GPIO |
| Pin 23 | PTD0 — GPIO |
| Pin 24 | PTD1 — GPIO |
| Pin 25 | PTD2 — GPIO |
| Pin 26 | PTD3 — GPIO |
| Pin 27 | PTD4/TPM2CH0 — GPIO / PWM channel |
| Pin 28 | PTD5/TPM2CH1 — GPIO / PWM channel |
| Pin 29 | PTD6 — GPIO |
| Pin 30 | PTD7 — GPIO |
| Pin 31 | PTE0/TxD2/CANTx — UART2 Tx / CAN Tx |
| Pin 32 | PTE1/RxD2/CANRx — UART2 Rx / CAN Rx |
| Pin 33 | PTE2 — GPIO |
| Pin 34 | PTE3 — GPIO |
| Pin 35 | PTE4 — GPIO |
| Pin 36 | PTE5 — GPIO |
| Pin 37 | PTE6 — GPIO |
| Pin 38 | PTE7 — GPIO |
| Pin 39 | PTF0 — GPIO |
| Pin 40 | PTF1 — GPIO |
| Pin 41 | PTF2 — GPIO |
| Pin 42 | PTF3 — GPIO |
| Pin 43 | PTF4 — GPIO |
| Pin 44 | PTF5 — GPIO |
| Pin 45 | PTF6 — GPIO |
| Pin 46 | PTF7 — GPIO |
| Pin 47 | PTG0 — GPIO |
| Pin 48 | PTG1 — GPIO |
| Pin 49 | PTG2 — GPIO |
| Pin 50 | PTG3 — GPIO |
| Pin 51 | VSS — Ground |
| Pin 52 | VDD — Supply voltage (2.7V to 5.5V) |
| Pin 53 | IRQ/TCLK/RESET — External IRQ, timer clock, or reset |
| Pin 54 | XIRQ — Non-maskable IRQ |
| Pin 55 | BKGD/MS — Background Debug Mode / Mode Select |
| Pin 56 | RESET — Reset input (active low) |
| Pin 57 | EXTAL — External oscillator / clock input |
| Pin 58 | XTAL — External crystal oscillator output |
| Pin 59 | PTH0 — GPIO |
| Pin 60 | PTH1 — GPIO |
| Pin 61 | PTH2 — GPIO |
| Pin 62 | PTH3 — GPIO |
| Pin 63 | TCLK — Timer clock input |
| Pin 64 | NC — Not connected (per datasheet) |
Typical Applications
MC9S08AC32MPUE is suitable for 6 applications: Automotive Body Control Module, Industrial Sensor Node Controller, HVAC Climate Control Board, Small Appliance Controller, LED Lighting Module, Home Security Sensor Hub.
Automotive Body Control Module
The MC9S08AC32MPUE fits automotive body controllers thanks to its integrated MSCAN 2.0A/2.0B interface (up to 1Mbps), 40MHz HCS08 throughput, and 38 I/O pins for driving relays, motors, and switches. The 32KB Flash supports multi-feature body control code with NXP's integrated BDM enabling fast field firmware updates via OBD. The wide 2.7-5.5V supply tolerates automotive cranking transients when paired with load-dump TVS protection per NXP AN1743. The 64-LQFP footprint stays compact under 10x10 mm, ideal for body-domain ECUs.
Recommended
Industrial Sensor Node Controller
In industrial 4-20mA sensor nodes, the MC9S08AC32MPUE delivers deterministic HCS08 instruction timing for accurate ADC sampling at 10-bit resolution with multiple input channels. Its low-power HCS08 core plus wide voltage range lets designers build loop-powered 3.3V or 5V transmitters. The integrated I2C/SPI interface connects external EEPROM or DAC chips, while SCI adds RS-485 UART communication. Industrial operating range of -40C to +85C and automotive-grade EMC robustness suit factory floor deployment in PLC backplanes and process instrumentation.
Recommended
HVAC Climate Control Board
The MC9S08AC32MPUE powers HVAC climate control boards using its TPM PWM modules for motor/solenoid control and 10-bit ADC for thermistor inputs. The 32KB Flash accommodates multiple temperature-setpoint profiles, scheduling routines, and display driving code. Its SCI/UART links to indoor unit displays, while I2C connects to remote temperature sensors. Operating reliably from 2.7V to 5.5V at -40C to +85C, it tolerates the temperature swings of furnace rooms and outdoor compressor units common in residential HVAC systems.
Recommended
Small Appliance Controller
The MC9S08AC32MPUE drives small appliances such as coffee makers, blenders, and rice cookers with its PWM-controlled relay outputs and ADC inputs for temperature/level sensing. Its 40MHz processing headroom handles real-time PID control loops, while 32KB Flash stores menu presets, fault logs, and display drivers. The integrated BDM debug port accelerates mass production calibration. Operating at 3.3V or 5V with internal voltage regulator, it eliminates external LDOs and reduces BOM cost in cost-sensitive consumer appliances targeting sub-$50 retail prices.
Recommended
LED Lighting Module
The MC9S08AC32MPUE controls LED lighting modules via its TPM PWM channels for dimming and color mixing using standard DMX512 or DALI protocols via SCI/UART. The HCS08 core's fast interrupt response ensures flicker-free PWM output across dimming ranges. Its 32KB Flash stores lighting scene definitions, fade tables, and bootloader code for field firmware updates via BDM. Operating at 3.3V with internal voltage regulator, it integrates cleanly into LED driver circuits; the 64-LQFP's -40C to +85C operation tolerates enclosed fixture temperatures up to 75C.
Recommended
Home Security Sensor Hub
The MC9S08AC32MPUE acts as a sensor hub for home security panels, aggregating PIR motion, door/window contact, and glass-break sensor inputs via its ADC and GPIO. The HCS08 core processes multiple interrupt-driven event handlers with deterministic timing. Its 32KB Flash and 2KB RAM fit Z-Wave or Zigbee interface code, while SCI/UART connects to the panel's main control board. Wide 2.7-5.5V supply supports battery-backup operation with brown-out reset for clean shutdown.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08AC32MPUE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08AC60CPUE | MC9S08AW32CPUE | SCS8AC60EACFUE |
|---|---|---|---|---|
| Package | 64-LQFP (10x10 mm) | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Flash Memory | 32 KB | 60 KB | 32 KB | 60 KB |
| RAM | 2 KB | 2 KB | 2 KB | 2 KB |
| CPU Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Core | HCS08 | HCS08 | HCS08 | HCS08 |
| MSCAN (CAN Interface) | Yes | Yes | No | Yes |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
Key Differentiators
- CAN interface integrated (vs MC9S08AW32CPUE)
- Pin-compatible upgrade path (vs MC9S08AC60CPUE)
- Industry-standard NXP S08 ecosystem (vs Legacy HC08 parts (MC908AB32MFUE))
Design Notes
Place a 100nF X7R ceramic decoupling capacitor within 5mm of each VDD pin (pins 14 and 52) with a short ground return. Add a 4.7uF to 10uF bulk capacitor at the regulator output. The MC9S08AC32MPUE has two VDD pins per its 64-LQFP layout - both must be decoupled. For automotive load-dump protection (ISO 7637-2 pulse 5a), use a bidirectional TVS diode rated 24V working voltage at the supply input per NXP AN1743.
The BKGD/MS pin (pin 55) is used for BDM debug and must be accessible on a test pad. Failure to provide BDM access on the PCB makes field firmware updates and factory programming impossible, often requiring board respins. The RESET pin (56) is bidirectional; a pull-up to VDD with a value 10k-100k and a 100nF capacitor to ground ensures clean power-on reset per NXP AN2143.
Estimated: at maximum CPU clock (40MHz) and full I/O switching, the MC9S08AC32MPUE dissipates approximately 0.5W internally. The 64-LQFP package has theta-JA around 65 C/W in still air, producing a 32C junction temperature rise above ambient. Well within operating limits. For closed enclosures above 60C ambient, place thermal vias under the exposed pad to spread heat. The internal HCS08 core supports low-power modes (STOP3, WAIT) reducing quiescent current to microamps.
Compliance Information
RoHS compliant per DigiKey distributor listing. Industrial temperature grade, not AEC-Q100 qualified; for AEC-Q100 see sister automotive AC family members. Lead-free terminations confirmed.