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NXP Semiconductors P80C557E4EFB/01,51
- Part No.:
- P80C557E4EFB/01,51
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 80-BQFP
- Datasheet:
-
P80C557E4EFB/01,51.pdf
- Description:
- IC MCU 8BIT ROMLESS 80PQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,649
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Product details
Overview
P80C557E4EFB/01,51 from Philips Semiconductors is a ROMless 8-bit microcontroller based on the 80C51 core, featuring 1024 × 8 internal RAM, two standard 16-bit timers, a third 16-bit timer with four capture and three compare registers, a 10-bit ADC with eight analog inputs, and dual 8-bit PWM outputs. It operates from 4.5 V to 5.5 V across –40°C to +85°C and supports 3.5–16 MHz oscillator frequency for industrial control and instrumentation applications.
For engineers reviewing the P80C557E4EFB/01,51 datasheet, P80C557E4EFB/01,51 pinout, P80C557E4EFB/01,51 application, or P80C557E4EFB/01,51 equivalent, key selection considerations include its QFP80 package with dedicated ADC input port (P5), I²C and UART serial interfaces, software-controllable ALE disable for EMI reduction, and dual power-reduction modes (Idle and Power-down) with wake-up via seconds timer or external interrupt.
Technical Context
The P80C557E4EFB/01,51 implements an enhanced 80C51 architecture with extended memory addressing: 1024-byte internal RAM (256-byte base + 768-byte AUX-RAM), support for up to 64 KB external program and data memory, and programmable ARD/XRAMP register for indirect AUX-RAM access. Its interrupt system provides 15 sources with two priority levels and configurable external trigger mapping on Port 1 pins (CT0I–CT3I).
It integrates a PLL-based clock generator using a 32 kHz crystal (XTAL3/XTAL4) with software-selectable system clock, plus a dedicated seconds timer and on-chip watchdog (T3) enabled via EW pin. The device includes electromagnetic compatibility features such as four VDD/VSS pairs, separated analog/digital supplies (AVDD1/AVSS1, AVDD2/AVSS2), and internal decoupling capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 80C51-compatible 8-bit RISC processor with full instruction set compatibility and 58% of instructions executed in 0.75 µs at 16 MHz |
| Internal RAM | 1024 × 8 bits (256-byte direct/indirect RAM + 768-byte AUX-RAM accessible via MOVX with XRAMP page register) |
| ADC | 10-bit successive-approximation converter with eight multiplexed analog inputs (P5.0–P5.7), programmable autoscan, and external start trigger (ADEXS) |
| Timers | Three 16-bit timers: two standard (T0/T1), one enhanced (T2) with four capture latches and three compare registers driving CMSR/CMT outputs on Port 4 |
| Serial Interfaces | Full-duplex UART (SIO0, P3.0/P3.1) and I²C-bus master/slave interface (SCL/SDA, P3.9/P3.10) with open-drain drivers |
| Power Modes | Idle Mode (CPU halted, RAM/timers/serial/interrupts active) and Power-down Mode (oscillator frozen, RAM retained, wake-up via RSTIN, seconds interrupt, or INT0/INT1) |
| Supply & Temp | 4.5 V to 5.5 V operation; guaranteed functionality from –40°C to +85°C; four dedicated VDD/VSS pins for improved EMC performance |
Pinout & Package
Package: Plastic Quad Flat Pack (QFP80), 80-pin, SOT318-1 footprint. Pin pitch: 0.65 mm. Body size: 14.0 × 20.0 mm. RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AVref– / AVref+ | Analog reference terminals | Define 10-bit ADC conversion range; require stable low-noise external reference or internal resistor divider biasing |
| P5.0–P5.7 | Analog input port | Eight dedicated ADC channel inputs; digital inputs only - no output capability; inherent hysteresis prevents excessive current draw from analog signals |
| ADEXS | ADC start trigger | Edge-sensitive input initiating conversion; must not float; complements software-started conversions |
| PWM0 / PWM1 | Pulse-width modulation outputs | Two independent 8-bit resolution PWM generators; used for motor control, LED dimming, or analog signal synthesis without external DAC |
| EW | Watchdog enable | Active-high input enabling T3 watchdog timer and disabling Power-down mode; must be held HIGH or driven by external logic |
| RSTIN / RSTOUT | Reset control pair | RSTIN accepts external reset pulses; RSTOUT drives peripheral reset during initialization or watchdog overflow - enables synchronized system reset |
| SELXTAL1 | Oscillator select | Logic level selects HF oscillator (XTAL1/XTAL2) or PLL (XTAL3/XTAL4); LOW enables PLL for precise low-jitter clock generation |
| XTAL3 / XTAL4 | 32 kHz oscillator inputs | Drive PLL reference oscillator; pulled LOW when PLL disabled or during reset - ensures deterministic startup behavior |
Key Features
| Feature | Design Value |
|---|---|
| ROMless architecture | Enables flexible boot from external EPROM/Flash or in-system programming via ISP-capable variants; eliminates mask ROM NRE cost and lead time |
| Four independent VDD/VSS pairs | Reduces ground bounce and supply noise; improves EMC immunity and radiated emissions - critical for industrial sensor and control systems |
| Software-controllable ALE disable (RFI bit) | Eliminates 1/6 system clock EMI noise during external memory access; allows quiet latch state while preserving MOVX functionality |
| Dedicated ADC input port with hysteresis | Prevents false triggering and excessive current draw when Port 5 pins receive analog signals near logic thresholds - simplifies mixed-signal interfacing |
| Seconds timer + wake-up from Power-down | Enables ultra-low-power periodic sensing or polling (e.g., environmental monitoring) without external real-time clock or wake-up controller |
| Port 4 compare/toggle outputs (CMSR/CMT) | Hardware-accelerated waveform generation and event timing - offloads CPU for precise pulse shaping, motor commutation, or encoder feedback |
Applications
| Industrial Temperature Monitoring | Automotive Body Control Module |
|---|---|
Use Scenario: Continuous measurement of multiple temperature sensors (thermistors/RTDs) in HVAC ducts or factory equipment cabinets. IC Role / Device Role / Timing Role: Central data acquisition unit performing 10-bit ADC sampling, digital filtering, and local alarm decision-making. Use Value: Integrated 8-channel ADC and hysteresis-equipped P5 port eliminate external multiplexer and Schmitt-trigger buffers - reducing BOM count and board area. |
Use Scenario: Managing door locks, window lifts, mirror controls, and interior lighting in mid-tier vehicles. IC Role / Device Role / Timing Role: Real-time I/O coordinator executing CAN-linked commands while generating PWM for motor drivers and reading switch states. Use Value: Dual PWM outputs (PWM0/PWM1) directly drive H-bridge gate drivers; I²C interface connects to ambient light and occupancy sensors - minimizing external logic. |
| Programmable Logic Controller (PLC) I/O Base | Smart Energy Meter Front-End |
Use Scenario: Modular PLC expansion module handling discrete input/output and analog process signals in factory automation. IC Role / Device Role / Timing Role: Deterministic I/O handler with hardware capture (CT0I–CT3I) for high-speed pulse counting and edge detection on field inputs. Use Value: Four capture inputs on Port 1 enable simultaneous monitoring of encoder quadrature signals or flow meter pulses - eliminating need for external counter ICs. |
Use Scenario: Isolated front-end acquisition of voltage, current, and neutral current in residential smart meters. IC Role / Device Role / Timing Role: Precision analog subsystem managing anti-aliasing, gain scaling, and RMS calculation prior to isolation and communication. Use Value: Dedicated AVDD/AVSS rails and separate reference pins (AVref±) ensure ADC accuracy under noisy power conditions - meeting IEC 62053-21 Class 0.5S requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P89C557E4EFB | Includes 32 KB on-chip FEEPROM instead of ROMless configuration; supports in-system programming and code protection via software byte | Suitable for firmware-upgradable devices where field updates are required; eliminates need for external program memory | Select when firmware persistence and update capability outweigh cost and development flexibility of external memory |
| AT89C55WD-24PU | 8051-compatible MCU with 20 KB Flash, single 16-bit timer, no integrated ADC or PWM; operates at 24 MHz max, commercial temp range only (0°C to +70°C) | Limited to simpler control tasks without analog sensing or precision timing; lacks capture/compare peripherals and dual PWM | Choose only for cost-sensitive, non-analog, non-automotive applications where extended temperature range and advanced peripherals are unnecessary |
Compared with P80C557E4EFB/01,51, the P89C557E4EFB adds flash-based firmware storage but removes external memory flexibility, while the AT89C55WD-24PU sacrifices ADC, PWM, capture/compare, and extended temperature rating - making it unsuitable for demanding industrial or automotive roles requiring mixed-signal integration and robust operation.
Availability
P80C557E4EFB/01,51 is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, programmable logic controllers, and smart energy metering applications requiring stable component supply, long-term lifecycle support, and extended temperature operation.
Supply support for P80C557E4EFB/01,51 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
Philips Semiconductors (now NXP Semiconductors) is a global leader in high-reliability embedded control solutions, with deep expertise in automotive, industrial, and consumer microcontrollers.
The P8xC557E4 family was designed specifically for real-time embedded applications requiring integrated analog peripherals, deterministic timing, and robust EMC performance - targeting instrumentation, industrial automation, and automotive control subsystems.
FAQ
What is the function of the EW pin on the P80C557E4EFB/01,51?
The EW (Enable Watchdog) pin on the P80C557E4EFB/01,51 is an active-high input that enables the T3 watchdog timer and disables the Power-down mode. When held HIGH, it permits watchdog reset functionality and prevents entry into Power-down; when LOW or floating, watchdog operation is inhibited and Power-down becomes available. This pin must not float and requires explicit external or internal logic control to ensure predictable reset behavior in the P80C557E4EFB/01,51 system design.
Does the P80C557E4EFB/01,51 include on-chip program memory?
No, the P80C557E4EFB/01,51 is the ROMless variant of the P8xC557E4 family. It contains no internal program memory and relies entirely on external program memory (up to 64 KB) accessed via Port 0 and Port 2. This distinguishes it from the P83C557E4 (mask ROM) and P89C557E4 (FEEPROM) variants. The P80C557E4EFB/01,51 boots from external EPROM, Flash, or other compatible memory mapped at address 0x0000, with EA pin controlling execution source selection during reset.
How does the P80C557E4EFB/01,51 support analog-to-digital conversion?
The P80C557E4EFB/01,51 integrates a 10-bit successive-approximation ADC with eight multiplexed analog inputs routed exclusively to Port 5 (P5.0–P5.7). Conversion is initiated either by software command or via edge-triggered ADEXS pin. It supports programmable autoscan mode and uses dedicated AVDD1/AVSS1 and AVref± pins for noise-isolated reference and supply - ensuring accuracy in mixed-signal environments without external ADC components in the P80C557E4EFB/01,51 implementation.
What are the power-reduction modes supported by the P80C557E4EFB/01,51?
The P80C557E4EFB/01,51 supports two software-selectable power-reduction modes: Idle Mode freezes the CPU while maintaining RAM, timers, serial ports, and interrupt functionality; Power-down Mode halts the oscillator and disables all clocks except the seconds timer, retaining RAM contents. Wake-up from Power-down is possible via RSTIN, seconds interrupt, or external interrupts INT0/INT1 - enabling ultra-low-power periodic sensing in battery-operated P80C557E4EFB/01,51 applications.
Can the P80C557E4EFB/01,51 operate with both 32 kHz and high-frequency crystals simultaneously?
Yes, the P80C557E4EFB/01,51 supports dual-crystal operation: XTAL1/XTAL2 (3.5–16 MHz) for main system clock and XTAL3/XTAL4 (32 kHz) for PLL reference and seconds timer. SELXTAL1 pin selects between them - LOW enables PLL-driven system clock from XTAL3/XTAL4, HIGH selects XTAL1/XTAL2 oscillator. Both crystals may be populated, but only one clock domain is active at a time, ensuring precise low-power timing and flexible P80C557E4EFB/01,51 system clocking.
P80C557E4EFB/01,51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 80-BQFP
- Series:
- 80C
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- EBI/EMI, I2C, UART/USART
- Peripherals:
- POR, PWM, WDT
- Number of I/O:
- 40
- Program Memory Size:
- -
- Program Memory Type:
- ROMless
- EEPROM Size:
- -
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P80C557E4EFB/01,51 FAQ
1.How can I place an order for P80C557E4EFB/01,51 through Aetrix?
Please submit a Request for Quotation (RFQ) for P80C557E4EFB/01,51 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 P80C557E4EFB/01,51 reliable?
The price and inventory of P80C557E4EFB/01,51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P80C557E4EFB/01,51 is usually 5 days.
3.What payment methods are accepted for P80C557E4EFB/01,51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P80C557E4EFB/01,51 transactions.
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4.How is shipping managed for P80C557E4EFB/01,51?
P80C557E4EFB/01,51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P80C557E4EFB/01,51 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 P80C557E4EFB/01,51?
For technical support, including P80C557E4EFB/01,51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P80C557E4EFB/01,51 requirements.
6.How does Aetrix verify that P80C557E4EFB/01,51 is sourced from the original manufacturer or authorized distributors?
All P80C557E4EFB/01,51 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 P80C557E4EFB/01,51 meets industry standards.
7.What is the process for return or replacement of P80C557E4EFB/01,51?
All P80C557E4EFB/01,51 units undergo pre-shipment inspection (PSI). If there is an issue with P80C557E4EFB/01,51, 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 P80C557E4EFB/01,51 part is unused and in its original packaging.
Return procedure for P80C557E4EFB/01,51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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