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NXP Semiconductors PXAG37KFA,512
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- Part No.:
- PXAG37KFA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
PXAG37KFA,512.pdf
- Description:
- IC MCU 16BIT 32KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,683
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Product details
Overview
PXAG37KFA,512 from NXP Semiconductors (formerly Philips Semiconductors) is a 16-bit OTP microcontroller with 32 KB on-chip EPROM, 512 B RAM, watchdog timer, and dual enhanced UARTs. It operates from 2.7 V to 5.5 V, supports external bus widths of 8 or 16 bits, and targets industrial control systems requiring deterministic real-time I/O handling and legacy 80C51 code migration.
For engineers reviewing the PXAG37KFA,512 datasheet, PXAG37KFA,512 pinout, PXAG37KFA,512 application, or PXAG37KFA,512 equivalent, this device offers verified 20-bit addressing, PLCC44 packaging with –40°C to +85°C industrial temperature range, and hardware-level compatibility with 80C51 instruction flow for rapid firmware porting.
Technical Context
The PXAG37KFA,512 implements the XA (eXtended Architecture) 16-bit CPU core with 24-bit address capability (configured to 20-bit in this variant), eight general-purpose 16-bit registers, and an enhanced instruction set supporting signed/unsigned 16×16 multiply and 32/16 divide. Its architecture enables direct memory operations and bit-intensive logic while maintaining upward compatibility with 80C51 assembly and C toolchains.
It integrates three independent 16-bit timers (T0, T1, T2), where T2 provides capture, auto-reload up/down counting, and baud rate generation modes. The watchdog timer uses a dedicated WDCON register with programmable timeout prescaling (PRE2:PRE0), and both UARTs support 9-bit mode, multiprocessor communication, and automatic address recognition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | XA 16-bit static CPU with 20-bit address space (1 MB program/data), upward-compatible with 80C51 instruction set |
| Memory | 32 KB on-chip OTP EPROM; 512 B on-chip SRAM; supports external program/data bus (8/16-bit configurable) |
| Timers | Three 16-bit timers: T0/T1 (four modes including enhanced Mode 0); T2 (capture, auto-reload up/down, baud rate generator) |
| Communication | Dual enhanced UARTs with 9-bit mode, TI/RI flags, break detection, and multiprocessor addressing support |
| Watchdog | Dedicated watchdog timer with WDCON register; prescaler selectable via PRE2:PRE0 bits; reset-on-timeout behavior |
| Supply & Temp | 2.7 V to 5.5 V operation; industrial temperature range –40°C to +85°C; PLCC44 package (SOT187-2) |
| I/O Ports | Four 8-bit programmable I/O ports (P0–P3); each pin independently configurable as quasi-bidirectional, push-pull, open-drain, or input-only |
Pinout & Package
Package: PLCC44 (plastic leaded chip carrier; 44 leads; SOT187-2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS (pins 1, 22) | Ground reference | 0 V return path for all internal circuits and I/O; dual ground pins reduce noise coupling |
| VDD (pins 23, 44) | Power supply | Primary power rail for core, peripherals, and I/O; decoupling required at both pins per datasheet layout guidelines |
| P1.4/RxD1 (pin 6) | Serial input | Receiver input for UART1; supports standard asynchronous framing and multiprocessor address detect |
| P1.5/TxD1 (pin 7) | Serial output | Transmitter output for UART1; driven by S1BUF register; TI flag indicates byte transmission completion |
| P3.0/RxD0 (pin 11) | Serial input | Receiver input for UART0; independent control via S0CON register; supports same features as UART1 |
| P3.1/TxD0 (pin 13) | Serial output | Transmitter output for UART0; TI_0 flag signals transmit interrupt; compatible with legacy 80C51 serial timing |
| RST (pin 10) | Reset input | Active-low synchronous reset; initializes all SFRs, I/O ports, and CPU state; requires minimum 2-cycle low pulse |
| XTAL1/XTAL2 (pins 21/20) | Oscillator interface | Connects to external crystal or clock source; XTAL1 is inverter input, XTAL2 is output; supports 1–20 MHz operation |
Key Features
| Feature | Design Value |
|---|---|
| 80C51 code compatibility | Direct execution of translated 80C51 assembly/C code via CM bit in SCR register; preserves interrupt vector mapping and PSW behavior |
| Configurable I/O drive strength | Each port pin independently set to quasi-bidirectional, push-pull, open-drain, or input-only via PnCFGA/PnCFGB registers |
| External bus flexibility | 8-bit or 16-bit data bus width selected at reset via BUSW pin (P3.5); address range dynamically configurable up to 20 bits |
| Enhanced Timer 2 | Supports capture, auto-reload up/down counting, and baud rate generation using oscillator-derived TCLK with PT1:PT0 prescaler selection |
| Watchdog reliability | Independent watchdog clock domain; WDTOF flag indicates timeout event; WDRUN bit enables/disables runtime control |
Applications
| Industrial PLC I/O Module | Legacy Equipment Retrofit Controller |
|---|---|
Use Scenario: Real-time monitoring and control of discrete sensors/actuators in factory automation cabinets with RS-485 fieldbus connectivity. IC Role / Device Role / Timing Role: Primary controller executing ladder logic scan cycles; UART0 handles Modbus RTU master polling; UART1 manages local HMI debug interface. Use Value: 512 B RAM supports multiple concurrent Modbus transaction buffers; dual UARTs eliminate external transceiver arbitration logic; 32 KB OTP stores full application firmware without external memory. | Use Scenario: Replacement of obsolete 80C51-based motion controllers in CNC machine tools requiring minimal PCB redesign. IC Role / Device Role / Timing Role: Drop-in architectural upgrade running recompiled 80C51 firmware; leverages existing schematics and layout with identical PLCC44 footprint and pin-compatible I/O mapping. Use Value: 10× faster instruction throughput enables higher servo loop rates; watchdog ensures fail-safe shutdown during communication loss; industrial temp rating matches original equipment requirements. |
| Energy Meter Communication Hub | Building Automation Gateway |
Use Scenario: Aggregating pulse outputs from mechanical kWh meters and transmitting data via GPRS modem over UART1 while receiving configuration commands via UART0. IC Role / Device Role / Timing Role: Protocol translation engine between meter pulse counters (T0/T1 edge-triggered capture) and modem AT command interface. Use Value: Timer 2 capture mode precisely timestamps meter pulses; 20-bit addressing allows future expansion with external flash for firmware OTA updates; OTP prevents unauthorized firmware modification. | Use Scenario: Interfacing BACnet MS/TP field devices (RS-485) with Ethernet backbone via embedded TCP/IP stack running on host processor. IC Role / Device Role / Timing Role: Dedicated serial protocol coprocessor managing physical layer timing, CRC calculation, and token-passing arbitration for MS/TP network. Use Value: Dual UARTs handle simultaneous MS/TP traffic and debug logging; watchdog ensures recovery from bus lockup; 512 B RAM accommodates full MS/TP frame buffering and state machine context. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 80C51FA | 8-bit core; 32 KB ROM; single UART; no T2 or enhanced timer modes; 12-clock cycle per instruction vs XA's 1–4 cycle | Limited to lower-speed control tasks; cannot execute XA-optimized code or leverage T2 capture/baud generation | Select only when cost sensitivity outweighs performance and peripheral requirements; requires full firmware rewrite |
| XA-G37KFA,512 (same part, different datecode) | No functional difference; identical OTP mask, SFR map, and electrical specs; differs only in manufacturing lot/datecode traceability | Same application scope and design integration; fully interchangeable in production | Preferred for continuity; verify datecode compliance with OEM lifecycle policies |
Compared with 80C51FA, PXAG37KFA,512 delivers 10× higher throughput and integrated dual UARTs with multiprocessor support, eliminating external logic; compared with newer XA variants, it retains OTP security and industrial temperature certification critical for long-lifecycle deployments.
Availability
PXAG37KFA,512 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy equipment retrofit controllers, and energy meter communication hubs requiring stable component supply across extended product lifecycles.
Supply support for PXAG37KFA,512 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 company formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The XA family was designed specifically to bridge the performance gap between 8-bit 80C51 derivatives and 32-bit MCUs, enabling high-volume industrial customers to migrate legacy firmware while retaining cost-effective PLCC packaging and OTP security.
FAQ
What is the maximum operating frequency supported by PXAG37KFA,512?
PXAG37KFA,512 supports external crystal or clock inputs up to 20 MHz, as specified in the AC Electrical Characteristics section of its 2002 datasheet. The internal timing generator derives all peripheral clocks-including TCLK for timers and UART baud generation-from this source, with prescaler options (Osc/4, Osc/16, Osc/64) enabling precise timing control across voltage ranges of 2.7 V to 5.5 V.
Does PXAG37KFA,512 support in-system programming (ISP)?
No, PXAG37KFA,512 does not support in-system programming. It uses one-time programmable (OTP) EPROM technology, meaning firmware must be programmed prior to soldering using a dedicated EPROM programmer. Programming occurs via the EA/VPP/WAIT pin (pin 35) with elevated voltage (VPP), and security bits prevent readback-ensuring firmware intellectual property protection in deployed units.
How is the external bus width configured on PXAG37KFA,512?
The external bus width on PXAG37KFA,512 is determined at reset by sampling the BUSW signal on P3.5 (pin 17). A logic low configures an 8-bit data bus with 20-bit addressing; a logic high selects a 16-bit data bus. This setting loads into the Bus Configuration Register (BCR) and defines default address bus size-critical for interfacing with external memory or peripherals without runtime reconfiguration.
Can PXAG37KFA,512 operate reliably at 2.7 V supply voltage?
Yes, PXAG37KFA,512 is fully specified for operation from 2.7 V to 5.5 V across its industrial temperature range (–40°C to +85°C). DC and AC electrical characteristics-including timing parameters, I/O voltage thresholds, and watchdog functionality-are validated at 2.7 V, making it suitable for battery-backed or low-voltage industrial systems where brown-out resilience is required.
What UART features differentiate PXAG37KFA,512 from standard 80C51 derivatives?
PXAG37KFA,512 enhances UART functionality beyond standard 80C51 with 9-bit mode support, multiprocessor communication capability, automatic address recognition, and independent status registers (S0STAT/S1STAT) reporting frame error (FE), break detect (BR), and overrun (OE). These features enable robust multi-drop RS-485 networks without external address decoding logic-directly reducing BOM count and improving system reliability.
PXAG37KFA,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- XA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- XA
- Core Size:
- 16-Bit
- Speed:
- 30MHz
- Connectivity:
- UART/USART
- Peripherals:
- PWM, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 512 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
PXAG37KFA,512 FAQ
1.How can I place an order for PXAG37KFA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for PXAG37KFA,512 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PXAG37KFA,512 reliable?
The price and inventory of PXAG37KFA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PXAG37KFA,512 is usually 5 days.
3.What payment methods are accepted for PXAG37KFA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PXAG37KFA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PXAG37KFA,512?
PXAG37KFA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PXAG37KFA,512 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PXAG37KFA,512?
For technical support, including PXAG37KFA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PXAG37KFA,512 requirements.
6.How does Aetrix verify that PXAG37KFA,512 is sourced from the original manufacturer or authorized distributors?
All PXAG37KFA,512 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PXAG37KFA,512 meets industry standards.
7.What is the process for return or replacement of PXAG37KFA,512?
All PXAG37KFA,512 units undergo pre-shipment inspection (PSI). If there is an issue with PXAG37KFA,512, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PXAG37KFA,512 part is unused and in its original packaging.
Return procedure for PXAG37KFA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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