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NXP Semiconductors PXAG37KBA,512
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- Part No.:
- PXAG37KBA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
PXAG37KBA,512.pdf
- Description:
- IC MCU 16BIT 32KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,673
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Product details
Overview
PXAG37KBA,512 from Philips Semiconductors is a 16-bit XA architecture microcontroller with 32 KB on-chip OTP EPROM, 512 B RAM, watchdog timer, two enhanced UARTs, and three 16-bit timers - used in industrial control systems requiring deterministic serial communication and external bus interfacing.
For engineers reviewing the PXAG37KBA,512 datasheet, PXAG37KBA,512 pinout, PXAG37KBA,512 application, or PXAG37KBA,512 equivalent, key selection criteria include 44-pin PLCC package compatibility, 2.7–5.5 V operation, 20-bit address space (1 MB program/data), quasi-bidirectional I/O port configuration, and dual UART support for multiprocessor communications.
Technical Context
The PXAG37KBA,512 implements the XA extended architecture with upward compatibility to 80C51 instruction set and memory model, supporting high-level language compilation via segmented data memory, banked registers, and 32 vectored interrupts. Its CPU core delivers 10–100× performance over 80C51 through 24-bit addressing capability and 16×16 multiply/32÷16 divide instructions.
It features dual UARTs with 9-bit mode, automatic address recognition, and break detection; Timer 2 supports capture, auto-reload (up/down), baud rate generation, and programmable clock-out; watchdog timer uses dedicated WDCON register with prescaler select and overflow flag.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit XA CPU with 24-bit address range, upward-compatible with 80C51 instruction set and memory model |
| Memory | 32 KB on-chip OTP EPROM + 512 B static RAM; supports external program/data bus up to 20-bit address (1 MB) |
| Operating Voltage | 2.7 V to 5.5 V - enables direct interface with both 3.3 V and 5 V peripheral logic without level shifters |
| Timers | Three 16-bit timers: T0/T1 (80C51-compatible modes + enhanced Mode 0); T2 (capture, auto-reload up/down, baud gen, clock-out) |
| Serial Interfaces | Two UARTs with independent control/status registers, 9-bit mode, multiprocessor comms, and automatic address recognition |
| I/O Ports | Four 8-bit ports (P0–P3), each with user-configurable output type (quasi-bidirectional, push-pull, open-drain, input-only) |
| Package | 44-pin PLCC (SOT187-2), lead-free compatible, 0 to +70 °C industrial temperature range |
Pinout & Package
PLCC44 package (SOT187-2) with 44 leads, plastic leaded chip carrier, body dimensions per JEDEC MS-026. Pin functions validated per Philips XA-G37 Product Data (2002 Mar 25).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 23, 44) | Power supply input | Primary VCC rail for core and I/O; decoupling required at both pins for noise immunity in mixed-signal operation |
| VSS (Pins 1, 22) | Ground reference | Dual ground pins reduce ground bounce during high-speed I/O transitions and external bus activity |
| P0.0–P0.7 (Pins 43–36) | Multiplexed address/data bus (AD0–AD7) | Low byte of external bus in 8-bit mode; latched via ALE; requires external latch for address hold during memory access |
| P2.0–P2.7 (Pins 24–31) | High address bus (A12–A19) | Provides upper address bits in 16-bit bus mode; configurable width in 8-bit mode via software register |
| RxD0/TxD0 (Pins 11, 13) | UART0 serial interface | Full-duplex asynchronous comms; supports standard and 9-bit framing for device addressing in multi-drop networks |
| RxD1/TxD1 (Pins 6, 7) | UART1 serial interface | Independent second UART enabling simultaneous host debug and fieldbus protocol stack (e.g., Modbus RTU) |
| XTAL1/XTAL2 (Pins 21, 20) | Crystal oscillator inputs | Supports fundamental-mode quartz crystals (1–20 MHz); internal inverter enables low-cost clock source without external components |
| EA/VPP/WAIT (Pin 35) | External access control / wait input | Latched at reset to select internal/external code execution; functions as bus wait input post-reset for timing extension |
Key Features
| Feature | Design Value |
|---|---|
| 20-bit address space (1 MB) | Enables large firmware images and external data buffers without bank switching overhead in real-time control loops |
| Two independent UARTs with 9-bit mode | Allows one UART for host diagnostics and second for fieldbus slave communication with hardware-address filtering |
| Timer 2 with capture and auto-reload up/down | Supports precise pulse-width measurement (e.g., motor encoder feedback) and bidirectional counter applications (e.g., position tracking) |
| Watchdog timer with programmable timeout | Prevents system lockup in unattended industrial nodes; timeout period selected via WDCON prescaler bits (PRE2:0) |
| Four configurable I/O ports | Per-pin output mode selection enables optimal drive strength and noise margin for mixed-voltage peripherals (e.g., 3.3 V sensors + 5 V actuators) |
Applications
| Industrial PLC I/O Module | Energy Meter Communication Hub |
|---|---|
Use Scenario: Standalone I/O expansion module in distributed control system, interfacing with analog/digital sensors and relay drivers via external bus. IC Role / Device Role / Timing Role: Main controller executing real-time scan logic, managing dual UARTs for HMI and fieldbus (e.g., Profibus DP slave), and driving external memory-mapped I/O. Use Value: 32 KB OTP stores full ladder logic interpreter; 20-bit addressing supports 64 KB external I/O map; watchdog ensures fail-safe shutdown on firmware hang. | Use Scenario: Two-way communication bridge between metrology ASIC and AMI (Advanced Metering Infrastructure) RF module in smart electricity meter. IC Role / Device Role / Timing Role: Protocol translator and buffer manager handling DLMS/COSEM over UART0 (to ASIC) and M-Bus/RF over UART1 (to transceiver). Use Value: Dual UARTs eliminate need for external UART IC; 512 B RAM accommodates packet buffering; 2.7–5.5 V operation matches battery-backed meter power rails. |
| Legacy Equipment Retrofit Controller | Factory Automation Serial Gateway |
Use Scenario: Drop-in replacement for obsolete 80C51-based motion controller in CNC retrofit, retaining existing PCB layout and firmware structure. IC Role / Device Role / Timing Role: Pin-compatible upgrade path with identical interrupt vector mapping and SFR layout; executes translated 80C51 assembly with 10× speedup. Use Value: Upward compatibility reduces firmware porting effort; enhanced timers enable higher-resolution PWM for servo drive control without external logic. | Use Scenario: Protocol gateway connecting RS-232 legacy machines (e.g., older PLCs) to Ethernet-based SCADA via Modbus TCP translation. IC Role / Device Role / Timing Role: Dual UART handles concurrent RS-232 master/slave roles; external bus interfaces with Ethernet MAC controller (e.g., LAN91C111) via memory-mapped I/O. Use Value: 44-pin PLCC fits legacy socket footprint; 32 KB OTP stores dual-protocol stack; power-down mode reduces idle power in unattended gateways. |
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-2 (NXP) | 8-bit 80C51 core, 32 KB Flash, 1.25 KB RAM, single UART, no Timer 2 or 20-bit addressing | Limited to simpler control tasks; lacks dual UARTs and external bus bandwidth for multi-protocol gateways | Select only when cost sensitivity outweighs performance and peripheral requirements; not suitable for PXAG37KBA,512's dual-serial or large-memory use cases |
| XA-G38KBBD (NXP) | Same XA family, 64 KB OTP, 1 KB RAM, identical pinout/package, same UART/timer/peripheral set | Direct functional upgrade path with doubled program memory and RAM for complex protocol stacks or larger control algorithms | Choose when firmware size exceeds 32 KB or additional RAM is needed for dynamic data structures; maintains full hardware/software compatibility |
Compared with 80C51FA-2, PXAG37KBA,512 delivers 16-bit processing, dual UARTs, and 20-bit addressing essential for modern industrial gateways; versus XA-G38KBBD, it trades memory capacity for lower cost and power in resource-constrained edge nodes where 32 KB suffices.
Availability
PXAG37KBA,512 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, energy meter communication hubs, legacy equipment retrofit controllers, and factory automation serial gateways requiring stable component supply across long-lifecycle deployments.
Supply support for PXAG37KBA,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 (formerly Philips Semiconductors) is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The XA-G37 product line was designed for high-performance embedded control in industrial automation and instrumentation, delivering 80C51 compatibility with scalable 16-bit architecture, integrated peripherals, and robust OTP memory for firmware integrity.
FAQ
What is the maximum operating frequency supported by PXAG37KBA,512?
PXAG37KBA,512 supports crystal frequencies up to 20 MHz per the AC Electrical Characteristics table in the 2002 datasheet. At 20 MHz, the internal TCLK can be configured as Osc/4 (5 MHz), Osc/16 (1.25 MHz), or Osc/64 (312.5 kHz), enabling precise baud rate generation and timer resolution matching industrial serial standards like RS-485 and Modbus RTU. The actual instruction throughput depends on the selected TCLK prescaler and instruction mix.
Does PXAG37KBA,512 support in-system programming (ISP)?
No, PXAG37KBA,512 does not support in-system programming. It uses one-time programmable (OTP) EPROM memory, meaning firmware must be programmed prior to soldering using a dedicated EPROM programmer. Programming requires applying VPP (12.5 V) to the EA/VPP/WAIT pin (Pin 35) and following the EPROM Characteristic sequence in the datasheet. Field updates are not possible after programming.
How is the watchdog timer reset handled in PXAG37KBA,512?
PXAG37KBA,512 watchdog reset is triggered by failure to write valid values (0xAA followed by 0x55) to WFEED1 (0x45D) and WFEED2 (0x45E) within the timeout window. Upon timeout, WDTOF bit in WDCON (0x41F) is set and a hardware reset occurs. The reset vector is executed, and WDCON resets to E6 if caused by watchdog, distinguishing it from power-on or external reset events for diagnostic logging in the PXAG37KBA,512 firmware.
Can PXAG37KBA,512 operate with a 3.3 V supply while maintaining full functionality?
Yes, PXAG37KBA,512 operates across 2.7 V to 5.5 V, including 3.3 V nominal supply. All specifications - including DC electrical characteristics, AC timing, UART baud accuracy, and I/O voltage levels - are guaranteed over this full range. At 3.3 V, maximum clock frequency is reduced per the AC Electrical Characteristics (VDD = 2.7–4.5 V) table, but all peripherals (dual UARTs, timers, watchdog, external bus) remain fully functional without derating or configuration changes in the PXAG37KBA,512.
What are the I/O port configuration options available on PXAG37KBA,512?
PXAG37KBA,512 provides four 8-bit I/O ports (P0–P3), each with independently configurable output types: quasi-bidirectional (default at reset), push-pull, open-drain, or input-only. Configuration is controlled via Port Configuration Registers (e.g., P0CFGA/P0CFGB at 0x470/0x4F0). This allows mixing drive strengths on a single port - for example, driving 5 V relays with push-pull outputs while reading 3.3 V sensor signals on open-drain inputs - all managed in firmware without external components for the PXAG37KBA,512.
PXAG37KBA,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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
PXAG37KBA,512 FAQ
1.How can I place an order for PXAG37KBA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for PXAG37KBA,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 PXAG37KBA,512 reliable?
The price and inventory of PXAG37KBA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PXAG37KBA,512 is usually 5 days.
3.What payment methods are accepted for PXAG37KBA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PXAG37KBA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PXAG37KBA,512?
PXAG37KBA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PXAG37KBA,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 PXAG37KBA,512?
For technical support, including PXAG37KBA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PXAG37KBA,512 requirements.
6.How does Aetrix verify that PXAG37KBA,512 is sourced from the original manufacturer or authorized distributors?
All PXAG37KBA,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 PXAG37KBA,512 meets industry standards.
7.What is the process for return or replacement of PXAG37KBA,512?
All PXAG37KBA,512 units undergo pre-shipment inspection (PSI). If there is an issue with PXAG37KBA,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 PXAG37KBA,512 part is unused and in its original packaging.
Return procedure for PXAG37KBA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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