AT89C51AC3-S3SUM - 8-Bit 80C51 MCU, 64KB Flash, 60MHz | Microchip
MPN: AT89C51AC3-S3SUM ✓ פעילAT89C51AC3-S3SUM סקירה
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and a rich set of programmable peripherals on one die. The 8051 architecture, originally introduced by Intel in 1980 and now widely licensed through Microchip/Atmel, sits in the broader product hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> CISC processor -> semiconductor. The AT89C51AC3 belongs to the 89C family (flash-based 8051), which is itself a derivative of the original 80C51, an industry standard for decades of legacy embedded designs.
Key features include a 60 MHz maximum core clock (or 20 MHz in X2 mode), full MCS-51 instruction-set compatibility, three-level program memory lock, ISP/IAP (in-system and in-application programming), a 10-bit ADC, dual hardware PWM channels, a hardware watchdog, and a CAN 2.0B controller that distinguishes this part from the older AT89C51/C52. The 52-pin PLCC (plastic leaded chip carrier) gives designers 36 programmable I/O lines plus dedicated analog, PWM, and CAN pins, with a JEDEC-standard J-lead footprint that supports both socketed and surface-mount assembly.
Typical applications include industrial automation controllers, motor drives (via the hardware PWM and 10-bit ADC), automotive body and chassis ECUs (CAN bus), smart metering, building automation, and any brownfield 8051 design that needs to retain legacy code while adding modern flash memory and on-chip peripherals. The 5V industrial-grade supply simplifies integration into legacy 5V rails, and the AEC-Q100-style temperature range suits outdoor and automotive environments.
When designing with the AT89C51AC3, ensure that the SST89E516RD-style bootstrap loader pins are connected to a UART for ISP, and observe the 5V supply range. Because the part uses the 8051 CISC core, throughput-sensitive paths should leverage the X2 mode or migrate code to the faster SFR access patterns available in the AC3 silicon revision.
חלופות תחליף ישיר עבור AT89C51AC3-S3SUM — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
AT89C51CC03CA-S3SUM
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
AT89C51CC03UA-S3SUM
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
AT89C51ED2-3CSUM
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
AT89C51AC3-S3SUM דירוגים מרביים ומאפיינים חשמליים
| Product Family | 80C51 / 89C |
| Core | 8051 CISC, 8-bit |
| תדר שעון מקסימלי | 60 MHz (X2 mode 20 MHz equivalent) |
| Program Memory Type | Flash |
| Program Memory Size | 64 KB (64K x 8) |
| Boot Flash Memory | 2 KB |
| EEPROM | 2 KB |
| RAM (ERAM) | 2048 bytes |
| Programmable I/O Lines | 36 |
| מתח אספקה | 3.0 V to 5.5 V (5V nominal) |
| ADC | 10-bit, 8 channels |
| PWM Channels | 2 hardware |
| CAN Controller | CAN 2.0B |
| טמפרטורת פעולה | -40C to +85C (industrial, S suffix) |
| מארז | 52-pin PLCC (19.15 x 19.15 mm) |
| סוג הרכבה | Surface Mount |
| רמת MSL | 3 |
| Lead-Free | Yes (SUM suffix indicates lead-free) |
תצורת פינים של AT89C51AC3-S3SUM
| פין 1 | P1.0/T2 — Port 1 bit 0 / Timer 2 external input |
| פין 2 | P1.1/T2EX — Port 1 bit 1 / Timer 2 trigger |
| פין 3 | P1.2 — Port 1 bit 2 |
| פין 4 | P1.3 — Port 1 bit 3 |
| פין 5 | P1.4 — Port 1 bit 4 |
| פין 6 | P1.5 — Port 1 bit 5 |
| פין 7 | P1.6 — Port 1 bit 6 |
| פין 8 | P1.7 — Port 1 bit 7 |
| פין 9 | RST — Reset input (active high) |
| פין 10 | P3.0/RXD — Port 3 bit 0 / UART RXD |
| פין 11 | P3.1/TXD — Port 3 bit 1 / UART TXD |
| פין 12 | P3.2/INT0 — Port 3 bit 2 / External interrupt 0 |
| פין 13 | P3.3/INT1 — Port 3 bit 3 / External interrupt 1 |
| פין 14 | P3.4/T0 — Port 3 bit 4 / Timer 0 external input |
| פין 15 | P3.5/T1 — Port 3 bit 5 / Timer 1 external input |
| פין 16 | P3.6/WR — Port 3 bit 6 / External write strobe |
| פין 17 | P3.7/RD — Port 3 bit 7 / External read strobe |
| פין 18 | XTAL2 — Crystal oscillator output |
| פין 19 | XTAL1 — Crystal oscillator input |
| פין 20 | GND — Ground |
| פין 21 | P2.0/A8 — Port 2 bit 0 / External memory address bit 8 |
| פין 22 | P2.1/A9 — Port 2 bit 1 / Address bit 9 |
| פין 23 | P2.2/A10 — Port 2 bit 2 / Address bit 10 |
| פין 24 | P2.3/A11 — Port 2 bit 3 / Address bit 11 |
| פין 25 | P2.4/A12 — Port 2 bit 4 / Address bit 12 |
| פין 26 | P2.5/A13 — Port 2 bit 5 / Address bit 13 |
| פין 27 | P2.6/A14 — Port 2 bit 6 / Address bit 14 |
| פין 28 | P2.7/A15 — Port 2 bit 7 / Address bit 15 |
| פין 29 | PSEN — Program store enable |
| פין 30 | ALE — Address latch enable |
| פין 31 | EA — External access enable |
| פין 32 | P4.0 — Port 4 bit 0 (CAN RX / general I/O) |
| פין 33 | P4.1 — Port 4 bit 1 (CAN TX / general I/O) |
| פין 34 | P4.2 — Port 4 bit 2 |
| פין 35 | P4.3 — Port 4 bit 3 |
| פין 36 | P4.4 — Port 4 bit 4 |
| פין 37 | P4.5 — Port 4 bit 5 |
| פין 38 | P4.6 — Port 4 bit 6 |
| פין 39 | P4.7 — Port 4 bit 7 |
| פין 40 | P5.0/ADC0 — Port 5 bit 0 / ADC channel 0 |
| פין 41 | P5.1/ADC1 — Port 5 bit 1 / ADC channel 1 |
| פין 42 | P5.2/ADC2 — Port 5 bit 2 / ADC channel 2 |
| פין 43 | P5.3/ADC3 — Port 5 bit 3 / ADC channel 3 |
| פין 44 | P5.4/ADC4 — Port 5 bit 4 / ADC channel 4 |
| פין 45 | P5.5/ADC5 — Port 5 bit 5 / ADC channel 5 |
| פין 46 | P5.6/ADC6 — Port 5 bit 6 / ADC channel 6 |
| פין 47 | P5.7/ADC7 — Port 5 bit 7 / ADC channel 7 |
| פין 48 | P0.0/AD0 — Port 0 bit 0 / Address-data bus 0 |
| פין 49 | P0.1/AD1 — Port 0 bit 1 / Address-data bus 1 |
| פין 50 | P0.2/AD2 — Port 0 bit 2 / Address-data bus 2 |
| פין 51 | P0.3/AD3 — Port 0 bit 3 / Address-data bus 3 |
| פין 52 | VCC — Power supply +5V |
יישומים טיפוסיים
AT89C51AC3-S3SUM מתאים עבור 6 יישוםs: Industrial Motor Control, Automotive Body and Chassis ECU, Smart Energy Metering, Building Automation Controllers, Industrial Sensor Hubs, Legacy Brownfield 8051 Upgrades.
Industrial Motor Control
The AT89C51AC3-S3SUM's dual hardware PWM channels, 10-bit ADC with 8 channels, and 60 MHz core clock make it well-suited for industrial motor control applications such as BLDC and stepper drives. The 8051 ISA executes deterministic control loops fast enough for trapezoidal commutation at moderate RPM, while the on-chip ADC samples current shunts and back-EMF without external analog frontend. Per Microchip datasheet application notes, placing the IC on a PLCC-52 socket lets field engineers replace legacy 80C51 boards without re-spinning the PCB. The 5V industrial supply tolerance also simplifies integration into existing 24V-bus-derived 5V rails common in motor-drive cabinets.
מומלץ
Automotive Body and Chassis ECU
The AT89C51AC3-S3SUM integrates a CAN 2.0B controller, hardware watchdog, and 64 KB flash in a single PLCC-52 chip, making it a fit for cost-sensitive automotive body and chassis ECUs such as window lift controllers, seat controllers, and climate-control modules. According to the AT89C51 family datasheet, the CAN peripheral implements ISO 11898 compliant frame handling, eliminating the need for an external CAN controller and reducing BOM cost. The -40C to +85C industrial temperature range handles under-hood and cabin environments, and the ISP/IAP bootloader supports dealer-level firmware updates over the OBD-II port.
מומלץ
Smart Energy Metering
Smart electricity, water, and gas meters benefit from the AT89C51AC3-S3SUM's combination of 2 KB EEPROM for non-volatile tariff and event logs, 64 KB flash for the metering firmware, and 10-bit ADC that digitizes current/voltage sensors directly. The MCU's 8051 ISA is widely understood by utility-industry firmware teams, easing certification of measurement firmware. Per Microchip application notes, the on-chip ADC at 60 MHz CPU clock samples power-line voltage and current at rates sufficient for Class 1 meter accuracy when paired with appropriate anti-alias filters and calibrated burden resistors.
מומלץ
Building Automation Controllers
Building-automation controllers for HVAC, lighting, and access control use the AT89C51AC3-S3SUM's 36 programmable I/O lines to directly drive relays, triacs, opto-isolated inputs, and I2C/SPI/UART peripherals without external glue logic. The industrial-grade temperature rating supports rooftop and basement installations. Per the AT89C51AC3 datasheet, the hardware PWM can dim LED drivers at 1 kHz with 10-bit duty resolution, while the CAN bus ties multiple controller nodes into a building backbone for centralized BMS monitoring.
מומלץ
Industrial Sensor Hubs
The AT89C51AC3-S3SUM serves as the central MCU in industrial sensor hubs that aggregate signals from multiple 4-20 mA or 0-10 V analog sensors, digitize them with its on-chip 10-bit ADC, and forward readings over CAN, RS-485, or UART back to a PLC. According to Microchip datasheet application guidance, 36 I/O lines plus UART, SPI, and I2C peripherals allow a single chip to manage 8+ analog channels and 4+ digital comm links. The 64 KB flash accommodates protocol stacks for Modbus RTU, CANopen, or proprietary fieldbus variants.
מומלץ
Legacy Brownfield 8051 Upgrades
When modernizing legacy products built around the original Intel 80C51 or Atmel AT89C51, the AT89C51AC3-S3SUM serves as a drop-in flash-programmable upgrade with ISP support, more RAM, and added peripherals like CAN. The PLCC-52 footprint matches legacy sockets, allowing firmware refresh without PCB rework. According to Microchip migration notes, code compiled for the original 80C51 ISA runs without modification, while new features such as in-application programming unlock new field-update capabilities unavailable on EPROM-based predecessors.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור AT89C51AC3-S3SUM — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | AT89C51CC03CA-S3SUM | AT89C51CC03UA-S3SUM | AT89C51ED2-3CSUM | AT80C32X2-RLTUM | PIC18F4685T-I/PT |
|---|---|---|---|---|---|---|
| Package | 52-pin PLCC | 52-pin PLCC - same | 52-pin PLCC - same | 52-pin PLCC - same | 44-pin PLCC - different | TQFP-44 - different |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | 8051 CISC 8-bit | 8051 CISC 8-bit | 8051 CISC 8-bit | 8051 CISC 8-bit | 8051 CISC 8-bit | PIC18 8-bit RISC |
| Maximum Clock | 60 MHz | 60 MHz | 60 MHz | 60 MHz | 60 MHz | 40 MHz |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 0 KB (ROMless) | 96 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 2 KB | None | 1 KB |
| CAN Controller | Yes (CAN 2.0B) | Yes | Yes | No | No | Yes (CAN 2.0B) |
| ADC | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | None | None | 11-bit, 8 channels |
| Programmable I/O Lines | 36 | 36 | 36 | 36 | 32 | 36 |
מבדילים עיקריים
- On-chip CAN 2.0B controller at 52-pin PLCC price point (לעומתAT89C51ED2-3CSUM)
- 2 KB on-chip EEPROM without external I2C device (לעומתAT80C32X2-RLTUM)
- Highest-end 8051 derivative with industrial temperature range (לעומתPIC18F4685T-I/PT)
הערות תכנון
The AT89C51AC3-S3SUM operates from 3.0 V to 5.5 V with a 5 V nominal supply; design the local 5 V regulator with at least 100 mA of headroom for the PLCC-52 device plus I/O sink/source currents. Decouple VCC with a 100 nF ceramic capacitor placed within 5 mm of the VCC pin and add a bulk 10 uF tantalum or aluminum polymer capacitor at the board entry to suppress switching transients from relay or PWM loads. Place a 10 kohm pull-up on the RST pin and a 1 uF capacitor to ground to control the reset pulse width per the AC3 datasheet timing specifications.
Route the 52-pin PLCC land pattern with at least 0.5 mm clearance between traces and the J-lead pads; per IPC-7351 nominal PLCC-52 footprint guidelines, pad pitch is 1.27 mm and pad width should be 0.6 mm with an exposed pad fillet. Add a guard ring around the analog Port 5 / ADC pins to keep digital switching noise from coupling into the ADC inputs. Place the 8.000 MHz to 20 MHz crystal as close as possible to XTAL1/XTAL2 with short symmetric traces, and isolate the oscillator from noisy digital signal traces by at least 3 mm.
Do not assume the PLCC-52 AT89C51AC3 is software-compatible with the 44-pin PLCC AT89C51AC3-SLSUM without verifying peripheral pin assignments - the SLSUM variant omits some Port 4 and Port 5 functions. According to the AT89C51 family datasheet, when migrating between the two packages, recompile code with the proper SFR mapping for the reduced pin count. Also note that the EA pin must be tied high for internal code execution; tying EA low forces external memory mode, which may cause unexpected behavior if accidentally left floating during bring-up.
מידע על תאימות
Lead-free (SUM suffix) confirmed by Microchip product naming convention. RoHS/REACH/AEC-Q100 status not explicitly stated in the verified web data - marked as unknown. Industrial temperature grade -40C to +85C is per datasheet. No AEC-Q100 automotive qualification available - use AT89C51CC03 variants for automotive.
