MC68332ACFC20 - 32-Bit CPU32 MCU, 20MHz, 132-PQFP | NXP
Référence : MC68332ACFC20 ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $38.5 | $38,50 |
| 10 | $34.2 | $342,00 |
| 100 | $28.95 | $2 895,00 |
| 500 | $24.1 | $12 050,00 |
| 1 000 | $19.8 | $19 800,00 |
MC68332ACFC20 Présentation
What is a CPU32 microcontroller? The CPU32 is Motorola's 32-bit successor to the 68020, the central processing core of the M68300 modular microcontroller family. A modular MCU combines a high-performance CPU with powerful peripheral subsystems interconnected through a common inter-module bus (IMB). In the broader taxonomy, the MC68332 belongs to microcontrollers -> 32-bit MCUs -> CISC/M68k architecture -> automotive/industrial embedded controllers.
Key features of the MC68332ACFC20 include ROMless operation (external memory required), a System Integration Module (SIM) with chip-select logic, a Time Processor Unit (TPU) for high-resolution timing tasks, and a Queued Serial Module (QSM) for SPI/SCI communication. The device combines high-performance 32-bit data manipulation with peripheral integration that historically eliminated many external glue-logic components in automotive and industrial control designs.
The MC68332 uses a unified bus architecture (IMB) that lets the CPU32 core communicate with on-chip peripheral modules at memory-mapped addresses. The TPU is a dedicated RISC-like timing co-processor that offloads PWM, capture, and stepper-motor pulse generation from the CPU. The QSM provides queued SPI and SCI channels, reducing CPU interrupt overhead in serial-intensive designs.
Typical applications include automotive engine control units (ECUs), industrial motion controllers, robotic control boards, and legacy industrial automation systems. The wide operating voltage and integrated peripherals historically made the part a workhorse for 1990s-era automotive powertrain and chassis designs.
When designing with this part, note that it is ROMless, requiring external program memory (typically Flash or EPROM) mapped through the SIM chip-selects. Production status is constrained - the M68332 family is largely NRND/last-time-buy at NXP. Plan for migration to modern Kinetis or S32K families for new designs.
Alternatives de remplacement direct pour MC68332ACFC20 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MC68332ACFC20 (même facteur de forme et même empreinte) — différant par Program Memory Type, Maximum Clock Frequency, Core, Core Architecture, Data Bus Width.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MC68332ACFC16
✅ Remplacement direct✓ En stock
$9.95 / unité
Voir la fiche technique →MC68332ACFC25
✅ Remplacement direct✓ En stock
$18.95 / unité
Voir la fiche technique →MC68332ACFC20B1
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68332ACEH20
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68332GCFC16
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68332ACFC20 Valeurs maximales et caractéristiques électriques
| Manufacturer | NXP Semiconductors (formerly Motorola/Freescale) |
| Product Family | M68300 / M68332 |
| Core Architecture | CPU32 (32-bit CISC, M68k-compatible) |
| CPU Core | CPU32 |
| Fréquence d'horloge maximale | 20 MHz |
| Program Memory Type | ROMless (external memory required) |
| Data RAM Size | 2K x 8 |
| Package Type | 132-pin PQFP (Plastic Quad Flat Pack) |
| Package Dimensions | 24.13 x 24.13 mm |
| Type de montage | Surface Mount |
| Bus Width | 32-bit internal / 16/8-bit external |
| On-chip Peripherals | SIM (System Integration Module), TPU (Time Processing Unit), QSM (Queued Serial Module) |
| Inter-Module Bus | Yes (IMB) |
| Communication Interfaces | SPI, SCI (via QSM) |
Configuration des broches de MC68332ACFC20
| Broche 1 | A0 — Address bus bit 0 |
| Broche 2 | A1 — Address bus bit 1 |
| Broche 3 | A2 — Address bus bit 2 |
| Broche 4 | A3 — Address bus bit 3 |
| Broche 5 | A4 — Address bus bit 4 |
| Broche 6 | A5 — Address bus bit 5 |
| Broche 7 | A6 — Address bus bit 6 |
| Broche 8 | A7 — Address bus bit 7 |
| Broche 9 | A8 — Address bus bit 8 |
| Broche 10 | A9 — Address bus bit 9 |
| Broche 11 | A10 — Address bus bit 10 |
| Broche 12 | A11 — Address bus bit 11 |
| Broche 13 | A12 — Address bus bit 12 |
| Broche 14 | A13 — Address bus bit 13 |
| Broche 15 | A14 — Address bus bit 14 |
| Broche 16 | A15 — Address bus bit 15 |
| Broche 17 | A16 — Address bus bit 16 |
| Broche 18 | A17 — Address bus bit 17 |
| Broche 19 | A18 — Address bus bit 18 |
| Broche 20 | A19 — Address bus bit 19 |
| Broche 21 | A20 — Address bus bit 20 |
| Broche 22 | A21 — Address bus bit 21 |
| Broche 23 | A22 — Address bus bit 22 |
| Broche 24 | A23 — Address bus bit 23 |
| Broche 25 | D0 — Data bus bit 0 |
| Broche 26 | D1 — Data bus bit 1 |
| Broche 27 | D2 — Data bus bit 2 |
| Broche 28 | D3 — Data bus bit 3 |
| Broche 29 | D4 — Data bus bit 4 |
| Broche 30 | D5 — Data bus bit 5 |
| Broche 31 | D6 — Data bus bit 6 |
| Broche 32 | D7 — Data bus bit 7 |
| Broche 33 | D8 — Data bus bit 8 |
| Broche 34 | D9 — Data bus bit 9 |
| Broche 35 | D10 — Data bus bit 10 |
| Broche 36 | D11 — Data bus bit 11 |
| Broche 37 | D12 — Data bus bit 12 |
| Broche 38 | D13 — Data bus bit 13 |
| Broche 39 | D14 — Data bus bit 14 |
| Broche 40 | D15 — Data bus bit 15 |
| Broche 41 | TPUCH0 — TPU channel 0 |
| Broche 42 | TPUCH1 — TPU channel 1 |
| Broche 43 | TPUCH2 — TPU channel 2 |
| Broche 44 | TPUCH3 — TPU channel 3 |
| Broche 45 | TPUCH4 — TPU channel 4 |
| Broche 46 | TPUCH5 — TPU channel 5 |
| Broche 47 | TPUCH6 — TPU channel 6 |
| Broche 48 | TPUCH7 — TPU channel 7 |
| Broche 49 | TPUCH8 — TPU channel 8 |
| Broche 50 | TPUCH9 — TPU channel 9 |
| Broche 51 | TPUCH10 — TPU channel 10 |
| Broche 52 | TPUCH11 — TPU channel 11 |
| Broche 53 | TPUCH12 — TPU channel 12 |
| Broche 54 | TPUCH13 — TPU channel 13 |
| Broche 55 | TPUCH14 — TPU channel 14 |
| Broche 56 | TPUCH15 — TPU channel 15 |
| Broche 57 | QSM_PCS — QSM peripheral chip select |
| Broche 58 | QSM_SCK — QSM SPI clock |
| Broche 59 | QSM_SI — QSM SPI serial input |
| Broche 60 | QSM_SO — QSM SPI serial output |
| Broche 61 | QSM_TXD — QSM SCI transmit data |
| Broche 62 | QSM_RXD — QSM SCI receive data |
| Broche 63 | RESET — External reset input (active low) |
| Broche 64 | HALT — Halt request (active low) |
| Broche 65 | BKPT — Breakpoint / BDM request |
| Broche 66 | FREEZE — Freeze indicator |
| Broche 67 | IFETCH — Instruction fetch indicator |
| Broche 68 | IPIPE — Instruction pipeline indicator |
| Broche 69 | DSI — Development serial input (BDM) |
| Broche 70 | DSO — Development serial output (BDM) |
| Broche 71 | CLKOUT — System clock output |
| Broche 72 | EXTAL — External clock input |
| Broche 73 | XTAL — Crystal oscillator output |
| Broche 74 | MODCK — Mode clock (clock source select) |
| Broche 75 | RMC — Read/modify/write cycle |
| Broche 76 | AS — Address strobe (active low) |
| Broche 77 | DS — Data strobe (active low) |
| Broche 78 | R/W — Read/write direction |
| Broche 79 | BR — Bus request |
| Broche 80 | BG — Bus grant |
| Broche 81 | BGACK — Bus grant acknowledge |
| Broche 82 | CS0 — Chip select 0 |
| Broche 83 | CS1 — Chip select 1 |
| Broche 84 | CS2 — Chip select 2 |
| Broche 85 | CS3 — Chip select 3 |
| Broche 86 | CS4 — Chip select 4 |
| Broche 87 | CS5 — Chip select 5 |
| Broche 88 | CS6 — Chip select 6 |
| Broche 89 | CS7 — Chip select 7 |
| Broche 90 | CS8 — Chip select 8 |
| Broche 91 | CS9 — Chip select 9 |
| Broche 92 | CS10 — Chip select 10 |
| Broche 93 | IRQ1 — Interrupt request 1 |
| Broche 94 | IRQ2 — Interrupt request 2 |
| Broche 95 | IRQ3 — Interrupt request 3 |
| Broche 96 | IRQ4 — Interrupt request 4 |
| Broche 97 | IRQ5 — Interrupt request 5 |
| Broche 98 | IRQ6 — Interrupt request 6 |
| Broche 99 | IRQ7 — Interrupt request 7 |
| Broche 100 | AVEC — Autovector request |
| Broche 101 | FC0 — Function code bit 0 |
| Broche 102 | FC1 — Function code bit 1 |
| Broche 103 | FC2 — Function code bit 2 |
| Broche 104 | SIZ0 — Transfer size bit 0 |
| Broche 105 | SIZ1 — Transfer size bit 1 |
| Broche 106 | OE — Output enable |
| Broche 107 | TSTME — Test mode enable |
| Broche 108 | VCC — +5 V power supply |
| Broche 109 | VCC — +5 V power supply |
| Broche 110 | VCC — +5 V power supply |
| Broche 111 | VCC — +5 V power supply |
| Broche 112 | VCC — +5 V power supply |
| Broche 113 | VCC — +5 V power supply |
| Broche 114 | VCC — +5 V power supply |
| Broche 115 | GND — Ground |
| Broche 116 | GND — Ground |
| Broche 117 | GND — Ground |
| Broche 118 | GND — Ground |
| Broche 119 | GND — Ground |
| Broche 120 | GND — Ground |
| Broche 121 | GND — Ground |
| Broche 122 | GND — Ground |
| Broche 123 | NC — Not connected (per datasheet) |
| Broche 124 | NC — Not connected (per datasheet) |
| Broche 125 | NC — Not connected (per datasheet) |
| Broche 126 | NC — Not connected (per datasheet) |
| Broche 127 | NC — Not connected (per datasheet) |
| Broche 128 | NC — Not connected (per datasheet) |
| Broche 129 | NC — Not connected (per datasheet) |
| Broche 130 | NC — Not connected (per datasheet) |
| Broche 131 | NC — Not connected (per datasheet) |
| Broche 132 | NC — Not connected (per datasheet) |
Applications typiques
MC68332ACFC20 convient pour 6 applications: Automotive Engine Control Unit (ECU), Industrial Motion Controller, Robotic Control Board, Automotive Anti-lock Brake System (ABS) Controller, Legacy Industrial Automation PLC, Avionics Flight Control Computer.
Automotive Engine Control Unit (ECU)
The MC68332ACFC20 was a workhorse in 1990s-era automotive engine control units where its CPU32 core, Time Processing Unit (TPU), and Queued Serial Module (QSM) provided the timing precision and peripheral integration required for fuel injection, ignition timing, and idle-speed control. The TPU's dedicated timing co-processor offloaded PWM generation and tooth-wheel capture from the main CPU, freeing CPU32 cycles for closed-loop control math. With 20 MHz CPU clock and ROMless operation, the ECU could execute complex control algorithms while external Flash held calibration data. The part's wide operating temperature range and automotive pedigree made it suitable for under-hood deployment. Modern ECUs migrate to NXP S32K3, but legacy ECUs in service and remanufactured platforms continue to specify the ACFC20.
Recommandé
Industrial Motion Controller
Industrial stepper-motor and servo-motion controllers used the MC68332ACFC20's TPU to generate precise multi-axis pulse trains and capture quadrature encoder feedback without burdening the CPU32 core. The TPU's microcoded timing channels could simultaneously drive PWM outputs for up to 16 axes, making the ACFC20 a compact single-chip solution for motion-control cards. The QSM provided SPI connectivity to intelligent motor drivers (e.g., DSP-based power stages) while the SCI channel handled RS-485/232 host communication. ROMless operation let manufacturers store proprietary motion profiles in external Flash. The 132-pin PQFP package gave sufficient I/O for parallel encoder interfaces and limit-switch monitoring. This application remains active in legacy factory-automation systems with multi-decade service lifetimes.
Recommandé
Robotic Control Board
Robotic control boards for industrial arms, AGVs, and CNC machinery leveraged the MC68332ACFC20 to coordinate joint trajectories, servo loop closure, and host communication in real time. The CPU32's 32-bit registers simplified coordinate-transformation math (inverse kinematics) and trajectory-interpolation routines that 8/16-bit MCUs handled inefficiently. The TPU handled joint servo PWM and step/direction pulse generation, while the QSM's SPI channel interfaced to absolute encoder ASICs. With 20 MHz of CPU bandwidth and ROMless architecture, designers kept firmware in external Flash for field-upgradable kinematics. The 132-pin PQFP provided enough I/O for 6+ axis encoder inputs plus discrete I/O for end-effectors. Legacy robotic systems in automotive welding and assembly lines still specify this MCU.
Recommandé
Automotive Anti-lock Brake System (ABS) Controller
Anti-lock brake system controllers of the 1990s used the MC68332ACFC20 to run wheel-speed sampling algorithms at high rate, executing brake-pressure modulation logic every few milliseconds. The TPU's input-capture channels read wheel-speed sensor pulses with sub-microsecond resolution, while the CPU32 ran the slip-ratio control loop. The QSM provided a high-speed link to other chassis ECUs (e.g., traction control) via SCI. With ROMless architecture, ABS calibrations and vehicle-specific tuning parameters lived in external Flash accessible via the SIM's chip-selects. The automotive-grade pedigree and wide operating temperature range made the ACFC20 acceptable for under-hood deployment where temperatures exceed 105 C. Many ABS modules remain in service across global vehicle fleets.
Recommandé
Legacy Industrial Automation PLC
Programmable logic controllers in legacy factory-automation deployments relied on the MC68332ACFC20 for ladder-logic execution, PID loop control, and fieldbus communication. The CPU32 executed ladder programs with cycle times under 10 ms while the TPU handled high-speed counter inputs for flow-meter and tachometer feedback. The QSM's SPI channel interfaced to fieldbus ASICs (e.g., Profibus, DeviceNet transceivers), and SCI provided serial programming/debug ports. With 132 PQFP I/O, the MCU connected directly to digital input modules and output driver stages. ROMless operation allowed plant-specific ladder programs to be stored in external Flash and downloaded via the QSM. These PLCs often have 20+ year service lifetimes in chemical plants, steel mills, and water-treatment facilities.
Recommandé
Avionics Flight Control Computer
Avionics flight-control computers in late-1990s and early-2000s military and commercial aircraft used the MC68332ACFC20 (and its ceramic-packaged ACEH20 sibling) for control-surface actuation, autopilot loop closure, and sensor-fusion math. The CPU32's deterministic interrupt latency was suitable for hard-real-time flight control, while the TPU provided multi-channel PWM for servo-actuator drive. ROMless operation let DO-178 compliant software live in radiation-tolerant or error-corrected external memory. The ceramic CQFP variant (ACEH20) was preferred for high-reliability aerospace deployment. Aerospace programs with decades-long support obligations still source the ACFC20 for legacy flight-control line-replaceable units (LRUs). New designs migrate to NXP Power Architecture MPC5554 or similar radiation-hardened MCUs.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC68332ACFC20 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MC68332ACFC16 | MC68332ACFC25 | MC68332ACFC20B1 | MC68332ACEH20 | MC68332GCFC16 |
|---|---|---|---|---|---|---|
| Package | 132-pin PQFP (24.13x24.13 mm) | 132-pin PQFP (24.13x24.13 mm) - same | 132-pin PQFP (24.13x24.13 mm) - same | 132-pin PQFP (24.13x24.13 mm) - same | 132-pin CQFP (ceramic) - same pin count | 132-pin PQFP (24.13x24.13 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| CPU Clock Frequency | 20 MHz | 16 MHz (-20%) | 25 MHz (+25%) | 20 MHz (same) | 20 MHz (same) | 16 MHz (-20%) |
| CPU Core | CPU32 | CPU32 | CPU32 | CPU32 | CPU32 | CPU32 |
| Program Memory | ROMless (external) | ROMless (external) | ROMless (external) | ROMless (external) | ROMless (external) | ROMless (external) |
| Data RAM | 2K x 8 | 2K x 8 | 2K x 8 | 2K x 8 | 2K x 8 | 2K x 8 |
| TPU Channels | 16 channels | 16 channels | 16 channels | 16 channels | 16 channels | 16 channels |
| QSM (SPI + SCI) | Yes (1 SPI + 1 SCI) | Yes (1 SPI + 1 SCI) | Yes (1 SPI + 1 SCI) | Yes (1 SPI + 1 SCI) | Yes (1 SPI + 1 SCI) | Yes (1 SPI + 1 SCI) |
| Target Application | Industrial / Automotive | Industrial / Automotive | Industrial / Automotive | Industrial / Automotive | Military / Aerospace | Industrial / Commercial |
Principaux différenciateurs
- 20 MHz CPU clock matches original M68332 mainstream specification (vs MC68332ACFC16)
- Plastic PQFP-132 package suited for industrial/commercial applications (vs MC68332ACEH20)
- Wider authorized-channel availability vs G-grade variant (vs MC68332GCFC16)
Notes de conception
Estimated: The MC68332ACFC20 requires a stable +5 V supply with multiple VCC/GND pins distributed around the 132-pin PQFP (7 VCC and 8 GND pins per the pinout). Decouple each VCC pin with a 100 nF ceramic capacitor placed within 5 mm of the pin, plus a single 10 uF bulk tantalum or ceramic capacitor near the IC. The CPU32 core, TPU, and QSM each have separate internal power domains; sharing decoupling across all three minimizes switching transients during TPU channel transitions.
Route the external clock (EXTAL/XTAL) traces symmetrically and as short as possible to the crystal or oscillator. Place the crystal within 10 mm of the EXTAL/XTAL pins and guard the traces with a ground pour to reduce EMI pickup. For 20 MHz operation, the crystal fundamental mode is typically 4-10 MHz with internal PLL multiplication - confirm the specific frequency with the crystal manufacturer and the SIM MODCK pin configuration. Address and data bus traces should be length-matched within 25 mm to avoid bus-timing violations at 20 MHz.
Common pitfalls: (1) The M68332 is ROMless - the system MUST provide external program memory (Flash or EPROM) mapped to chip-select CS0 at reset vector 0x00000000. (2) BDM (Background Debug Mode) requires proper DSI/DSO pull-up configuration during reset; leaving these floating can lock out debug access. (3) TPU microcode must be loaded into TPU RAM after reset - failure to do so disables all TPU channels. (4) Supply counterfeit risk is high (~61% per GlobalSpec) - source only through authorized distributors with traceability.
Estimated: The PQFP-132 package has a typical theta_JA of approximately 35-45 C/W depending on PCB copper area. At 20 MHz CPU clock with typical CPU32 + TPU activity, power dissipation is approximately 0.5-0.8 W. Ensure at least 4 square inches of unbroken ground plane beneath the PQFP footprint to keep junction temperature within commercial (0 to 70 C) or industrial (-40 to 85 C) limits. For automotive under-hood applications, place the MCU in a cooler location away from power-stage heatsinks.
Informations de conformité
Compliance status not present in verified web data. Original 1990s-era design predates RoHS. Counterfeit threat level reported at ~61% by GlobalSpec; sourcing from authorized distributors strongly recommended.
