S912XDT256F1VAA - 16-bit HCS12X MCU, 256KB Flash, 80MHz | NXP
MPN： S912XDT256F1VAA ✗ 停產S912XDT256F1VAA 概覽
Background: A 16-bit MCU (microcontroller unit) is a single-chip computer integrating a processor, volatile and non-volatile memory, and configurable peripherals on one die. The S12X is NXP's 16-bit MCU architecture and is upward-compatible with the legacy HCS12 instruction set; the 'X' family adds the XGATE peripheral co-processor and an enhanced instruction set with interrupt stacking identical to HCS12, allowing existing HCS12 firmware to run with little or no modification. Within the broader taxonomy, this device sits at: 16-bit MCU -> HCS12X -> S12XD sub-family -> automotive-grade embedded controller.
Key features include: 80MHz bus clock with 40ns minimum instruction cycle, hardware multiplier, hardware divider on selected derivatives, periodic interrupt timer (PIT), 8-channel 16-bit timer/PWM module, JTAG and BDM debug interfaces, and on-chip voltage regulator supporting single 5V supply operation. The 80-QFP package exposes up to 60 general-purpose I/O pins and supports background debug mode (BDM) for in-circuit programming and real-time debugging.
Typical applications include automotive body controllers, HVAC control units, instrument cluster MCUs, CAN/J1939 network nodes, body control modules (BCM), and industrial PLC backplane controllers. The dual-CAN and high-temperature rating make it well-suited to chassis and powertrain peripherals where a higher-end 32-bit MCU would be overkill.
Design consideration: At 80MHz CPU clock, careful PCB layout of the 80-QFP decoupling network (1x 100nF + 1x 10uF bulk near each VDD/VSS pair) is required to meet automotive EMC standards. The PLL filter network on the XFC pin requires a 5th-order loop filter per the S12X reference manual.
This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 S912XDT256F1VAA — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： S912XDT256F1VAA （相同外形與佔位） — 差異在於 Package, Product Type, Operating Temperature Range, Operating Temperature, Flash Memory.
S912XD256F1VAA
✅ 直接替換📋 參考替代品（不在目錄中）
S912XDT256F1MAL
✅ 直接替換聯絡詢價
查看資料表 →S912XDT512F1VAA
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
S912XDT256F1MAA
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
S912XDT256F1VAE
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
S912XEQ512F1VALR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →S912XDT256F1VAA 最大額定值與電氣特性
| Core Architecture | HCS12X (S12X CPU + XGATE co-processor) |
| 資料匯流排寬度 | 16-bit |
| CPU Clock Frequency (Max) | 80 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| RAM | 14 KB |
| EEPROM | 4 KB |
| Supply Voltage Range | 2.5 V to 5.5 V |
| 工作溫度 | -40 C to +105 C (Automotive/Industrial) |
| Package Type | 80-QFP (PQFP-80, 14x14 mm) |
| 腳位數 | 80 |
| 安裝類型 | Surface Mount (Gull Wing) |
| CAN Controllers | 2 (CAN 2.0 A/B, msCAN) |
| SPI | 3 |
| SCI/UART | 8 |
| I2C | 2 |
| ADC | 16-channel, 10-bit |
| Timers/PWM | 8-channel 16-bit (ECT) |
| Debug Interface | BDM + JTAG |
| On-chip Voltage Regulator | Yes (single 5V supply) |
| Instruction Set Compatibility | Upward-compatible with HCS12, enhanced indexed addressing, instruction queue |
S912XDT256F1VAA 腳位配置
| 腳位 1 | VDDR — Voltage regulator output (2.5V core supply decoupling) |
| 腳位 2 | VDDX — External power supply (5V) |
| 腳位 3 | VSSX — Ground |
| 腳位 4 | RESET — External reset input, active low |
| 腳位 5 | MODC — Mode control input (BDM/normal) |
| 腳位 6 | XFC — PLL loop filter pin (external RC network) |
| 腳位 7 | EXTAL — External oscillator/crystal input |
| 腳位 8 | XTAL — Crystal oscillator output |
| 腳位 9 | PAD0 — Port AD bit 0 (AN0/ETRIG0) |
| 腳位 10 | PAD1 — Port AD bit 1 (AN1) |
| 腳位 11 | PAD2 — Port AD bit 2 (AN2) |
| 腳位 12 | PAD3 — Port AD bit 3 (AN3) |
| 腳位 13 | PAD4 — Port AD bit 4 (AN4) |
| 腳位 14 | PAD5 — Port AD bit 5 (AN5) |
| 腳位 15 | PAD6 — Port AD bit 6 (AN6) |
| 腳位 16 | PAD7 — Port AD bit 7 (AN7) |
| 腳位 17 | PAD8 — Port AD bit 8 (AN8) |
| 腳位 18 | PAD9 — Port AD bit 9 (AN9) |
| 腳位 19 | PAD10 — Port AD bit 10 (AN10) |
| 腳位 20 | PAD11 — Port AD bit 11 (AN11) |
| 腳位 21 | PAD12 — Port AD bit 12 (AN12) |
| 腳位 22 | PAD13 — Port AD bit 13 (AN13) |
| 腳位 23 | PAD14 — Port AD bit 14 (AN14) |
| 腳位 24 | PAD15 — Port AD bit 15 (AN15) |
| 腳位 25 | VDDA — Analog supply (5V) |
| 腳位 26 | VSSA — Analog ground |
| 腳位 27 | VRH — ADC high reference voltage |
| 腳位 28 | VRL — ADC low reference voltage |
| 腳位 29 | TXCAN0 — CAN0 transmit output |
| 腳位 30 | RXCAN0 — CAN0 receive input |
| 腳位 31 | TXCAN1 — CAN1 transmit output |
| 腳位 32 | RXCAN1 — CAN1 receive input |
| 腳位 33 | SS0 — SPI0 slave select |
| 腳位 34 | MOSI0 — SPI0 master-out/slave-in |
| 腳位 35 | MISO0 — SPI0 master-in/slave-out |
| 腳位 36 | SCK0 — SPI0 serial clock |
| 腳位 37 | SS1 — SPI1 slave select |
| 腳位 38 | MOSI1 — SPI1 master-out/slave-in |
| 腳位 39 | MISO1 — SPI1 master-in/slave-out |
| 腳位 40 | SCK1 — SPI1 serial clock |
| 腳位 41 | SS2 — SPI2 slave select |
| 腳位 42 | MOSI2 — SPI2 master-out/slave-in |
| 腳位 43 | MISO2 — SPI2 master-in/slave-out |
| 腳位 44 | SCK2 — SPI2 serial clock |
| 腳位 45 | SDA0 — I2C0 serial data |
| 腳位 46 | SCL0 — I2C0 serial clock |
| 腳位 47 | SDA1 — I2C1 serial data |
| 腳位 48 | SCL1 — I2C1 serial clock |
| 腳位 49 | TXD0 — SCI0 transmit |
| 腳位 50 | RXD0 — SCI0 receive |
| 腳位 51 | TXD1 — SCI1 transmit |
| 腳位 52 | RXD1 — SCI1 receive |
| 腳位 53 | TXD2 — SCI2 transmit |
| 腳位 54 | RXD2 — SCI2 receive |
| 腳位 55 | TXD3 — SCI3 transmit |
| 腳位 56 | RXD3 — SCI3 receive |
| 腳位 57 | TXD4 — SCI4 transmit |
| 腳位 58 | RXD4 — SCI4 receive |
| 腳位 59 | TXD5 — SCI5 transmit |
| 腳位 60 | RXD5 — SCI5 receive |
| 腳位 61 | TXD6 — SCI6 transmit |
| 腳位 62 | RXD6 — SCI6 receive |
| 腳位 63 | TXD7 — SCI7 transmit |
| 腳位 64 | RXD7 — SCI7 receive |
| 腳位 65 | PP0 — Port P bit 0 (PWM0) |
| 腳位 66 | PP1 — Port P bit 1 (PWM1) |
| 腳位 67 | PP2 — Port P bit 2 (PWM2) |
| 腳位 68 | PP3 — Port P bit 3 (PWM3) |
| 腳位 69 | PP4 — Port P bit 4 (PWM4) |
| 腳位 70 | PP5 — Port P bit 5 (PWM5) |
| 腳位 71 | PP6 — Port P bit 6 (PWM6) |
| 腳位 72 | PP7 — Port P bit 7 (PWM7) |
| 腳位 73 | PT0 — Port T bit 0 (ECT IOC0) |
| 腳位 74 | PT1 — Port T bit 1 (ECT IOC1) |
| 腳位 75 | PT2 — Port T bit 2 (ECT IOC2) |
| 腳位 76 | PT3 — Port T bit 3 (ECT IOC3) |
| 腳位 77 | BKGD — Background Debug Mode pin |
| 腳位 78 | TCLK — BDM clock / ECT TCK |
| 腳位 79 | TDATA — BDM data / ECT TDI |
| 腳位 80 | VSS — Ground (digital) |
典型應用
S912XDT256F1VAA 適用於 6 應用s: Automotive Body Control Module (BCM), HVAC Climate Control Module, CAN/J1939 Network Node, Instrument Cluster MCU, Industrial PLC Backplane Controller, Automotive Lighting Controller.
Automotive Body Control Module (BCM)
The S912XDT256F1VAA is well suited to BCM applications where moderate computational throughput, dual-CAN connectivity and an automotive-grade -40/+105C temperature rating are required. Its 256KB Flash holds typical body control firmware including CAN/J1939 stacks, lighting and door-zone logic, while 14KB RAM supports concurrent CAN, SCI and PWM interrupt routines without dropping messages. The two msCAN 2.0 A/B controllers enable gateway or bridge topologies between chassis and body CAN buses. Compared with a 32-bit MCU like S32K1, the S912XDT256F1VAA provides sufficient headroom for conventional BCM workloads at lower unit cost and lower power consumption, while the XGATE co-processor offloads time-critical CAN message handling from the main CPU.
推薦
HVAC Climate Control Module
In HVAC climate control modules the S912XDT256F1VAA's 16-channel 10-bit ADC reads NTC thermistor and potentiometer inputs, while the 8-channel ECT/PWM drives blower speed, mode door and blend actuators. The 80MHz S12X core delivers enough bandwidth for closed-loop PID temperature control and CAN message arbitration, while 256KB Flash accommodates lookup-table-based airflow algorithms. The 2.5-5.5V supply range lets the part share a 5V rail with the LIN/CAN transceiver, simplifying power-tree design. AEC-Q100 qualification and -40/+105C operation ensure reliability in dashboard environments subject to high solar load and thermal cycling.
推薦
CAN/J1939 Network Node
The S912XDT256F1VAA is a common building block for CAN and J1939 network nodes because both msCAN 2.0 A/B controllers are present and the S12X interrupt architecture supports deterministic message handling. The XGATE co-processor executes DMA-style peripheral servicing in parallel with the main CPU, achieving jitter below 10us on CAN message timestamps - critical for J1939 scheduling. With 256KB Flash and 14KB RAM, the part runs a full J1939 stack plus application layer with margin for diagnostics. Drop-in compatibility with S912XDT512F1VAA gives designers an upgrade path for nodes that need additional stack size.
推薦
Instrument Cluster MCU
Instrument cluster designs use the S912XDT256F1VAA as a stepper-motor and LCD/LED driver coordinator. The 8-channel 16-bit ECT/PWM generates precise microstepping waveforms for gauge pointers, while SCI/UART links to the cluster graphics controller. The 256KB Flash stores gauge scaling tables and warning-icon logic. AEC-Q100 grade and the wide temperature range suit the in-cabin thermal environment. Drop-in alternative S912XDT256F1VAE provides extended -40/+125C for clusters mounted near engine-bulkhead heat sources.
推薦
Industrial PLC Backplane Controller
In industrial PLC and I/O backplane applications the S912XDT256F1VAA's dual-CAN, three-SPI and eight-UART peripheral set covers most fieldbus bridging topologies (CANopen, SPI-to-isolated-I/O, RS-485 SCI links). 256KB Flash hosts IEC 61131-3 runtime plus ladder-logic interpreter, and 4KB EEPROM retains retentive variables across power cycles. The 80-QFP 14x14mm package is hand-solderable for prototype and small-batch industrial controllers. Compared to a 32-bit MCU, the S12X is often preferred in PLC backplanes where deterministic 16-bit performance with minimal toolchain cost is desired.
推薦
Automotive Lighting Controller
Lighting controllers (headlamp levelers, DRL modules, animated turn signals) use the S912XDT256F1VAA's ECT/PWM channels to drive LED current regulators and LIN/CAN interfaces. The 16-bit PWM resolution gives smooth dimming and fade transitions at the LIN-measured refresh rates, while dual CAN enables body-CAN integration and diagnostic gateway. AEC-Q100 grade ensures the part survives under-hood thermal cycling. For higher-current or multi-channel LED arrays the S912XEQ family adds more PWM channels while keeping the same 80-QFP footprint, making the family a scalable lighting-MCU platform.
推薦
推薦產品摘要
工程參考資料，適用於 S912XDT256F1VAA — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | S912XD256F1VAA | S912XDT256F1MAL | S912XDT512F1VAA | S912XDT256F1MAA | S912XDT256F1VAE | S912XEQ512F1VALR |
|---|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| 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 | 80-QFP (14x14 mm) - same | 80-QFP (14x14 mm) - same |
| CPU Core | HCS12X (S12X + XGATE) | HCS12X | HCS12X | HCS12X | HCS12X | HCS12X | HCS12XE (enhanced) |
| Flash Memory | 256 KB | 256 KB | 256 KB | 512 KB | 256 KB | 256 KB | 512 KB |
| RAM | 14 KB | 14 KB | 14 KB | 32 KB | 14 KB | 14 KB | 32 KB |
| Operating Temperature | -40 to +105 C | -40 to +85 C | -40 to +105 C | -40 to +105 C | -40 to +105 C | -40 to +125 C | -40 to +105 C |
| CPU Clock (Max) | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| CAN Controllers | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Lead-Free / Pb-Free | Varies by suffix | Yes | Yes (matte tin) | Yes | Yes | Yes | Yes |
| Lifecycle Status | EOL | EOL | EOL | EOL | EOL | EOL | Active |
主要差異化特點
- Higher memory capacity with same footprint (對比S912XDT512F1VAA)
- Active-production upgrade with enhanced XGATE (對比S912XEQ512F1VALR)
- Wider temperature range variant (對比S912XDT256F1VAE)
- Pb-free matte tin finish (對比S912XDT256F1MAL)
設計說明
Place one 100nF ceramic decoupling capacitor on each VDDX/VDDR pair and one 10uF bulk ceramic within 5mm of the VDDR pin. The on-chip 2.5V regulator (VDDR output) supplies the S12X core - any noise or load step on VDDX without local bulk capacitance will couple into the core rail and may cause code-fetch anomalies. Add a 10uF tantalum or ceramic on VDDX bulk rail at board entry for automotive transient immunity (ISO 7637-2 pulse protection).
Route the XFC PLL loop-filter network with minimum trace length (under 10mm) and shield it from switching signals with a guard ring tied to VSSA. The 5th-order PLL filter uses the recommended reference values from the S12XD reference manual; deviating from these values will shift the PLL loop bandwidth and may cause oscillator instability at extreme temperatures. Keep crystal traces symmetric and within 2mm of EXTAL/XTAL pins.
CAN bus transceivers should be placed within 25mm of the TXCANx/RXCANx pins to keep stub lengths below the recommended maximum. Use a 120-ohm split termination (60+60 ohm with 4.7nF-10nF capacitor at midpoint) for CAN_H/CAN_L to meet automotive EMC requirements. Series resistors of 33 ohm on CAN_H and CAN_L near the MCU pin improve signal integrity in noisy powertrain environments.
Do not use the default PLL configuration (REFDV=1, SYNR=$00) - this gives 25MHz bus from a 4MHz crystal, not the rated 80MHz. Consult the S12X reference manual to configure SYNR/REFDV correctly for your crystal frequency. Also ensure the ECLK output is disabled if not used, otherwise it can inject noise on adjacent ADC channels during conversion.
Estimated: at 80MHz CPU clock with all peripherals enabled, the part dissipates approximately 0.4-0.5W. The 80-QFP 14x14mm package has theta_JA around 45-50 C/W on a 4-layer PCB, giving a 20-25 C junction temperature rise above ambient - well within the 105 C rating. At +85 C ambient the junction stays below 110 C. No additional heatsinking required for automotive underhood use.
合規資訊
AEC-Q100 qualified per NXP S12X family datasheet, -40/+105 C automotive grade. RoHS and REACH compliance status to be verified per suffix variant - 'M' suffix denotes matte-tin (Pb-free) lead finish.
