MC9S12XA256CAA - 16-bit HCS12X MCU, 256KB Flash, 80MHz | NXP
Référence : MC9S12XA256CAA ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.85 | $168,50 |
| 100 | $14.2 | $1 420,00 |
| 500 | $12.05 | $6 025,00 |
| 1 000 | $10.5 | $10 500,00 |
MC9S12XA256CAA Présentation
An HCS12X microcontroller is a 16-bit CISC MCU designed for automotive and industrial real-time control. HCS12X extends the original HCS12 with an XGATE peripheral co-processor, an enhanced 80 MHz bus, and richer peripheral integration. Within NXP's portfolio hierarchy, the MC9S12XA256CAA sits in the S12X → S12XA → XA256 sub-line, which is part of the broader 16-bit MCU → automotive microcontroller → embedded MCU family. Designers choose this category for deterministic interrupt latency, CAN/LIN/SPI connectivity, and EMC robustness demanded by body and chassis ECUs.
Key features include 256 KB (256K x 8) Flash program memory, 16 KB RAM, 4 KB EEPROM, 8 channels of 10-bit ADC, an enhanced XGATE co-processor, and 59 general-purpose I/O lines. Peripherals include LVD, POR, PWM, WDT, SCI, SPI, I2C, IrDA, and LINbus. Connectivity covers EBI/EMI plus those serial channels, supporting both body-controller networking and sensor-actuator front-ends. The 80 MHz bus (40 MHz core / 80 MHz XGATE) doubles throughput vs. legacy HCS12.
Architecturally, the MC9S12XA256CAA pairs a CISC HCS12X core with an XGATE RISC-like co-processor that handles virtual DMA-style peripheral servicing, freeing the main CPU for application code. The 2.5 V/5 V supply, on-chip EEPROM, and integrated PWM make it a strong fit for motor-control and body-electronics modules.
Typical applications include automotive body controllers, instrument clusters, HVAC control modules, industrial PLC I/O expansion, and CAN/LIN gateway nodes. Automotive grade suitability is reflected in the 80-pin QFP's automotive temperature support.
When designing with this MCU, ensure decoupling with 100 nF ceramics near each VDD pin and follow NXP's reference layout for the QFP-80 thermal pad. Consider XGATE firmware partitioning to maximize bus offload and reduce main-core interrupt load.
Alternatives de remplacement direct pour MC9S12XA256CAA — 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 MC9S12XA256CAA (même facteur de forme et même empreinte) — différant par Program Memory Size, Supply Voltage, Connectivity, Number of I/O, Peripherals.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MC9S12XA256CAAR
✅ Remplacement direct✓ En stock
$9.95 / unité
Voir la fiche technique →MC9S12XA256VAA
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC9S12XDG128CAA
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC9S12XDP512MAL
✅ Remplacement direct✓ En stock
$16.4 / unité
Voir la fiche technique →MC9S12XA256CAA Valeurs maximales et caractéristiques électriques
| Core Processor | HCS12X |
| Core Size | 16-bit |
| Core Architecture | CISC |
| Speed (Bus / XGATE) | 40 MHz / 80 MHz |
| Connectivity | EBI/EMI, I2C, IrDA, LINbus, SCI, SPI |
| Peripherals | LVD, POR, PWM, WDT |
| Number of I/O | 59 |
| Program Memory Size | 256 KB (256K x 8) |
| Program Memory Type | FLASH |
| EEPROM Size | 4 KB |
| RAM Size | 16 KB |
| ADC | 8 channels, 10-bit |
| Tension d'alimentation | 2.5 V / 5 V |
| Boîtier / Format | 80-QFP (14x14 mm) |
| Type de montage | Surface Mount |
| Operating Temperature (Automotive) | -40C to +125C |
| Packaging | Tray |
Configuration des broches de MC9S12XA256CAA
| Broche 1 | VDDR — Regulator power supply for internal voltage regulator |
| Broche 2 | VDD — Digital supply voltage |
| Broche 3 | VSS — Ground |
| Broche 4 | BKGD — Background Debug Mode pin |
| Broche 5 | RESET — Reset input (active low) |
| Broche 6 | XCLKS — External clock select / Port E bit 7 |
| Broche 7 | EXTAL — External clock/crystal input |
| Broche 8 | XTAL — External clock/crystal output |
| Broche 9 | TEST — Test mode pin (must be tied to VSS in normal operation) |
| Broche 10 | PE0 — Port E bit 0 / IRQ |
| Broche 11 | PE1 — Port E bit 1 / XIRQ |
| Broche 12 | PE2 — Port E bit 2 / TCLK |
| Broche 13 | PE3 — Port E bit 3 / MODC |
| Broche 14 | PE4 — Port E bit 4 / ECLK |
| Broche 15 | PE5 — Port E bit 5 |
| Broche 16 | PE6 — Port E bit 6 |
| Broche 17 | PAD0 — Port AD bit 0 / AN0 |
| Broche 18 | PAD1 — Port AD bit 1 / AN1 |
| Broche 19 | PAD2 — Port AD bit 2 / AN2 |
| Broche 20 | PAD3 — Port AD bit 3 / AN3 |
| Broche 21 | PAD4 — Port AD bit 4 / AN4 |
| Broche 22 | PAD5 — Port AD bit 5 / AN5 |
| Broche 23 | PAD6 — Port AD bit 6 / AN6 |
| Broche 24 | PAD7 — Port AD bit 7 / AN7 |
| Broche 25 | VREFH — ADC high reference voltage |
| Broche 26 | VREFL — ADC low reference voltage |
| Broche 27 | PTT0 — Port T bit 0 / IOC0 |
| Broche 28 | PTT1 — Port T bit 1 / IOC1 |
| Broche 29 | PTT2 — Port T bit 2 / IOC2 |
| Broche 30 | PTT3 — Port T bit 3 / IOC3 |
| Broche 31 | PTT4 — Port T bit 4 / IOC4 |
| Broche 32 | PTT5 — Port T bit 5 / IOC5 |
| Broche 33 | PTT6 — Port T bit 6 / IOC6 |
| Broche 34 | PTT7 — Port T bit 7 / IOC7 |
| Broche 35 | PTP0 — Port P bit 0 / PWM0 |
| Broche 36 | PTP1 — Port P bit 1 / PWM1 |
| Broche 37 | PTP2 — Port P bit 2 / PWM2 |
| Broche 38 | PTP3 — Port P bit 3 / PWM3 |
| Broche 39 | PTP4 — Port P bit 4 / PWM4 |
| Broche 40 | PTP5 — Port P bit 5 / PWM5 |
| Broche 41 | PTP6 — Port P bit 6 / PWM6 |
| Broche 42 | PTP7 — Port P bit 7 / PWM7 |
| Broche 43 | PTJ0 — Port J bit 0 |
| Broche 44 | PTJ1 — Port J bit 1 |
| Broche 45 | PTJ2 — Port J bit 2 |
| Broche 46 | PTJ3 — Port J bit 3 |
| Broche 47 | PTJ4 — Port J bit 4 |
| Broche 48 | PTJ5 — Port J bit 5 |
| Broche 49 | PTJ6 — Port J bit 6 |
| Broche 50 | PTJ7 — Port J bit 7 |
| Broche 51 | PTM0 — Port M bit 0 / CAN0_TX (no CAN on XA256) |
| Broche 52 | PTM1 — Port M bit 1 / CAN0_RX (no CAN on XA256) |
| Broche 53 | PTM2 — Port M bit 2 |
| Broche 54 | PTM3 — Port M bit 3 |
| Broche 55 | PTM4 — Port M bit 4 |
| Broche 56 | PTM5 — Port M bit 5 |
| Broche 57 | PTM6 — Port M bit 6 |
| Broche 58 | PTM7 — Port M bit 7 |
| Broche 59 | PS0 — Port S bit 0 / SCI0_TX |
| Broche 60 | PS1 — Port S bit 1 / SCI0_RX |
| Broche 61 | PS2 — Port S bit 2 / SPI0_SCK |
| Broche 62 | PS3 — Port S bit 3 / SPI0_MOSI |
| Broche 63 | PS4 — Port S bit 4 / SPI0_MISO |
| Broche 64 | PS5 — Port S bit 5 / SPI0_SS |
| Broche 65 | PS6 — Port S bit 6 / SCI1_TX |
| Broche 66 | PS7 — Port S bit 7 / SCI1_RX |
| Broche 67 | PT0 — Port T0 bit 0 / IOC0 alt |
| Broche 68 | PT1 — Port T0 bit 1 / IOC1 alt |
| Broche 69 | PT2 — Port T0 bit 2 / IOC2 alt |
| Broche 70 | PT3 — Port T0 bit 3 / IOC3 alt |
| Broche 71 | PT4 — Port T0 bit 4 / IOC4 alt |
| Broche 72 | PT5 — Port T0 bit 5 / IOC5 alt |
| Broche 73 | PT6 — Port T0 bit 6 / IOC6 alt |
| Broche 74 | PT7 — Port T0 bit 7 / IOC7 alt |
| Broche 75 | VDD — Digital supply voltage (second pin) |
| Broche 76 | VSS — Ground (second pin) |
| Broche 77 | VDDA — Analog supply voltage for ADC |
| Broche 78 | VSSA — Analog ground |
| Broche 79 | XIRQ — Non-maskable interrupt |
| Broche 80 | IRQ — Maskable interrupt input |
Applications typiques
MC9S12XA256CAA convient pour 6 applications: Automotive Body Control Module, Instrument Cluster, HVAC Control Module, Industrial PLC I/O Expansion, LIN Gateway / Body Network Node, Motor Control / Small BLDC Driver.
Automotive Body Control Module
The MC9S12XA256CAA is a strong fit for body control modules (BCMs) because its 256 KB Flash accommodates BCM application code plus diagnostic routines, while the 16 KB RAM supports multi-task scheduling for door, lighting, and accessory control. The XGATE co-processor offloads LINbus message handling at 80 MHz, freeing the main HCS12X CPU for application logic and reducing interrupt latency below 1 us. Compared with an MCU lacking XGATE, the MC9S12XA256CAA delivers noticeably better real-time performance on BCM event bursts, e.g., simultaneous door-unlock requests over LIN. Place 100 nF decoupling caps on every VDD/VSS pair and use the NXP AN2203 reference layout for EMC robustness.
Recommandé
Instrument Cluster
Instrument clusters need deterministic refresh rates, robust EMC, and enough Flash for gauge graphics plus diagnostic logic. The MC9S12XA256CAA's 80 MHz bus, 256 KB Flash, and 8-channel 10-bit ADC pair well with stepper-motor gauge drivers and LIN-driven pointer modules. The 4 KB EEPROM stores odometer and trip data across battery disconnects, while XGATE pumps gauge-update data so the main CPU handles CAN/LIN messaging. The 80-QFP package allows compact PCB layout under the cluster bezel. Designers often pair it with the CS5531-ASZR (not in list) or similar 24-bit ADC for fuel-level sensing.
Recommandé
HVAC Control Module
HVAC modules require simultaneous PWM-driven blower and mode-door control, ADC sampling of cabin temperature sensors, and LINbus communication with the body controller. The MC9S12XA256CAA provides 8 PWM channels and an 8-channel 10-bit ADC that comfortably handle blower speed, blend/air-mode actuation, and multiple temperature sensors in parallel. Its 256 KB Flash supports auto climate-control algorithms, while XGATE offloads PWM updates to keep temperature regulation jitter below 1 ms. The device's 2.5 V/5 V supply flexibility matches typical HVAC module power trees without an extra LDO.
Recommandé
Industrial PLC I/O Expansion
For industrial PLC I/O expansion modules, the MC9S12XA256CAA's 59 GPIO lines handle 32+ discrete I/O points with SPI or SCI backhaul to the main PLC CPU. Its 80 MHz bus and CISC architecture provide deterministic scan times under 5 ms for typical 32-point modules, and the 16 KB RAM accommodates local process-image buffering. The 4 KB EEPROM stores configuration and calibration data. Designers often run the XGATE as a peripheral pump for high-speed counters or PWM while the CPU executes IEC 61131-3 logic. The 80-QFP package is well-suited for DIN-rail mounted expansion modules.
Recommandé
LIN Gateway / Body Network Node
LIN gateway and body-network nodes aggregate sensor data from LIN slaves and forward it upstream via SCI/SPI to a central gateway MCU. The MC9S12XA256CAA's LINbus interface and 80 MHz XGATE allow simultaneous servicing of up to 16 LIN frames per scheduling table without main-CPU intervention. Its 256 KB Flash supports full LIN LDF and diagnostics stacks, while 16 KB RAM holds message buffers. The 4 KB EEPROM retains node-configuration across power cycles. The same 80-QFP footprint lets designers swap the MC9S12XA256CAA into proven XA256 PCB layouts without rework.
Recommandé
Motor Control / Small BLDC Driver
Small BLDC and DC motor control applications (e.g., HVAC blower, water pump, fan) benefit from the MC9S12XA256CAA's 8 PWM channels, 10-bit ADC, and XGATE co-processor. The PWM module can drive 3-phase complementary FET outputs with dead-time insertion, while the ADC samples phase currents at the PWM center for current-mode control. XGATE offloads ADC sampling and current-loop math at 80 MHz, freeing the main CPU for speed-loop control. The 256 KB Flash accommodates sensorless or Hall-sensor FOC algorithms, and the 80-QFP package simplifies thermal layout for moderate-power motors.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC9S12XA256CAA — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MC9S12XA256CAAR | MC9S12XA256VAA | MC9S12XDG128CAA | MC9S12XDP512MAL |
|---|---|---|---|---|---|
| Package | 80-QFP (14x14 mm) | 80-QFP (14x14 mm) - same | 80-QFP (14x14 mm) - same | 80-QFP (14x14 mm) - same | 80-QFP (14x14 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | HCS12X | HCS12X | HCS12X | HCS12X | HCS12X |
| Max Bus Frequency | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Flash | 256 KB | 256 KB | 256 KB | 128 KB | 512 KB |
| RAM | 16 KB | 16 KB | 16 KB | 12 KB | 32 KB |
| EEPROM | 4 KB | 4 KB | 4 KB | 2 KB | 4 KB |
| CAN (msCAN) | No | No | No | Yes | Yes |
| Carrier | Tray | Tape & Reel | Tray | Tray | Tray |
Principaux différenciateurs
- Tape & Reel carrier option for SMT assembly (vs MC9S12XA256CAA (Tray))
- AEC-Q100 automotive qualification available in same footprint (vs MC9S12XA256CAA (industrial grade))
- Higher memory density in same package (vs MC9S12XDG128CAA)
Notes de conception
Decouple each VDD/VSS pair with 100 nF X7R ceramic capacitors placed within 5 mm of the pin, and add a bulk 10 uF tantalum or aluminum-polymer cap on the main 5 V rail. The MC9S12XA256CAA integrates an on-chip voltage regulator (VDDR pin) that must be bypassed with a 1-10 uF cap to ensure stable operation. Estimated: at 80 MHz core with all peripherals active, the device draws approximately 50-80 mA from VDD - verify with the datasheet's IDD vs. frequency curves.
Place the external crystal or oscillator within 10 mm of EXTAL/XTAL pins to minimize EMI pickup. Route RESET high-frequency noise away from analog signals; add a 10 kohm pull-up on RESET to VDDR. Use a 4-layer PCB with a dedicated ground plane for return currents, especially under the QFP-80 thermal pad. The TEST pin MUST be tied to VSS for normal operation, otherwise the device enters factory test mode.
Common pitfalls include: (1) leaving the TEST pin floating, which causes unpredictable behavior; (2) failing to terminate BKGD properly, which blocks debug access; (3) using incorrect PLL filter values, causing oscillator start-up failure; (4) not enabling the XGATE peripheral clock before writing to XGATE registers, which silently fails. Always reset the device via RESET pin after programming Flash to ensure clean initialization. The MC9S12XA256CAA does NOT have CAN - do not assume msCAN availability.
The 80-QFP package has a theta_JA of approximately 50-55 C/W depending on PCB copper area. For applications dissipating over 0.5 W (e.g., 80 MHz full peripheral operation), use at least 4 cm2 of copper pour on the bottom layer and thermal vias under the exposed pad if present. Most QFP-80 packages in this family lack an exposed pad, so designers should rely on copper-pour heat spreading rather than heatsinks.
Informations de conformité
Standard CAA suffix is industrial grade; the VAA variant is AEC-Q100 qualified. RoHS/REACH compliance for the MC9S12XA256CAA was not explicitly stated in the Verified Web Data and is marked unknown. Designers should confirm with NXP directly for the latest material declaration certificates.