PIC16F84AT-20/SS - 20MHz 8-bit Flash MCU 1.75KB SSOP-20
MPN: PIC16F84AT-20/SS ✓ فعالPIC16F84AT-20/SS جائزہ
An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data path, on-chip program memory, RAM, I/O peripherals, and a CPU core. It belongs to the wider taxonomy: microcontroller -> embedded processor -> semiconductor -> integrated circuit. The PIC16F8X family uses a RISC Harvard architecture with only 35 single-word instructions, and all instructions execute in one instruction cycle except program branches which take two cycles - making it one of the simplest mid-range PIC families to learn and program.
Key features include 1.75 KB (1K x 14) of self-programmable Flash program memory, 68 bytes of data RAM, 64 bytes of EEPROM data memory, 13 digital I/O pins, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, a 16-bit timer/counter (TMR1), and a Watchdog Timer with its own on-chip RC oscillator. The part supports in-circuit serial programming (ICSP) via RB6 and RB7, enabling firmware updates after PCB assembly.
Architecturally the PIC16F84A integrates a precision 4 MHz internal RC calibration word, a power-on reset, brown-out detect, power-up timer, and the proprietary nanoWatt Technology dynamic power-management features that lower quiescent current in sleep mode. The Harvard bus keeps program and data memory separate, allowing instruction fetch and data access in a single cycle.
Typical applications include hobbyist and educational microcontroller projects, low-cost consumer appliances, automotive body controllers, sensor-interface front-ends, and legacy industrial-control retrofits where the PIC16F84A footprint has been qualified for years. The wide adoption also makes it a frequent BOM choice for educational kits and development boards.
When designing with the PIC16F84AT-20/SS, note that only 13 of the 20 pins are usable as general-purpose I/O because three pins are required for the crystal/oscillator and one for MCLR reset; designers must also budget for the 5V-only supply, since the 'A' revision does not support the 2.0 V minimum of newer PIC16F1xx families.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
کے لیے ڈراپ اِن متبادل PIC16F84AT-20/SS — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں PIC16F84AT-20/SS (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, Core Architecture, Timers, Operating Temperature Range, RoHS Status.
PIC16F84A-20/SS
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16F84AT-04/SS
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16F84A-20I/SS
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16F84A-04/SS
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16F628A-20/SS
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
PIC16F88-I/SS
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16F84AT-20/SS زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Core Architecture | 8-bit PIC16 Harvard RISC |
| Program Memory | 1.75 KB (1K x 14) Flash |
| Data RAM | 68 bytes |
| Data EEPROM | 64 bytes |
| زیادہ سے زیادہ کلاک فریکوئنسی | 20 MHz |
| Instruction Cycle | 200 ns (4 clock periods) |
| Supply Voltage (VDD) | 4.0 V to 5.5 V |
| Number of I/O Pins | 13 |
| Timers | TMR0 (8-bit) + TMR1 (16-bit) + WDT |
| آپریٹنگ درجہ حرارت رینج | -40C to +85C (industrial) |
| پیکیج | 20-pin SSOP (5.30 mm body) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| MSL لیول | 1 (unlimited) |
| ICSP / In-Circuit Programming | Yes (RB6/RB7) |
| Brown-Out Reset | Yes |
| Power-Up Timer | Yes |
| RoHS اسٹیٹس | Compliant |
PIC16F84AT-20/SS پن کنفیگریشن
| پن 1 | RA2 — PORTA bit 2 (digital I/O) |
| پن 2 | RA3 — PORTA bit 3 (digital I/O) |
| پن 3 | RA4/TOCKI — PORTA bit 4 / Timer0 clock input (open-drain) |
| پن 4 | MCLR/VPP — Master Clear reset (active low) / programming voltage input |
| پن 5 | VSS — Ground reference |
| پن 6 | RB0/INT — PORTB bit 0 / external interrupt input |
| پن 7 | RB1 — PORTB bit 1 (digital I/O) |
| پن 8 | RB2 — PORTB bit 2 (digital I/O) |
| پن 9 | RB3 — PORTB bit 3 (digital I/O) |
| پن 10 | RB4 — PORTB bit 4 (digital I/O, interrupt-on-change) |
| پن 11 | RB5 — PORTB bit 5 (digital I/O, interrupt-on-change) |
| پن 12 | RB6/PGC — PORTB bit 6 / ICSP clock (ICD clock) |
| پن 13 | RB7/PGD — PORTB bit 7 / ICSP data (ICD data) |
| پن 14 | VSS — Ground reference |
| پن 15 | OSC2/CLKOUT — Crystal/ceramic resonator output or clock out |
| پن 16 | OSC1/CLKIN — Crystal/ceramic resonator input or external clock in |
| پن 17 | RA0 — PORTA bit 0 (digital I/O) |
| پن 18 | RA1 — PORTA bit 1 (digital I/O) |
| پن 19 | RA4 (duplicate label reserved) — See pin 3 for full RA4/TOCKI function |
| پن 20 | VDD — Positive supply voltage (4.0 V to 5.5 V) |
عام استعمالات
PIC16F84AT-20/SS کے لیے موزوں ہے 6 ایپلیکیشنs: Educational and Hobbyist Microcontroller Projects, Automotive Body Electronics, Sensor Interface Front-Ends, Industrial Control Retrofits, Low-Cost Consumer Appliance Controllers, Remote Control and RF Encoder Sub-systems.
Educational and Hobbyist Microcontroller Projects
The PIC16F84AT-20/SS is one of the most widely adopted microcontrollers in university curricula and hobbyist projects because its 35-instruction RISC core is teachable in a single lab session. With 1.75 KB Flash and 13 I/O pins it fits LED cubes, line-follower robots, and IR remote controls. The SSOP-20 surface-mount package and 4.0-5.5 V supply match USB-powered dev boards. Unlike newer 32-bit Cortex-M0 parts, every PIC16F84A instruction is single-cycle, so students can compute exact loop timing without pipeline overhead. ICSP via RB6/RB7 enables reprogramming without removing the chip from the target board.
تجویز کردہ
Automotive Body Electronics
The PIC16F84AT-20/SS has been used in automotive body controllers since the late 1990s for low-speed tasks such as seat-position memory, mirror-fold control, and interior lamp dimming. Its -40C to +85C industrial temperature grade tolerates cabin environments, and 13 digital I/O pins are sufficient to scan a small switch matrix and drive relay coils. The PIC16F84A's 5V-only supply matches legacy 12V-to-5V linear rails common in pre-CAN body modules. AEC-Q100 is not formally listed on the datasheet, but automotive customers have long qualified it for non-safety body functions.
تجویز کردہ
Sensor Interface Front-Ends
With a 200 ns instruction cycle and 13 bidirectional I/O, the PIC16F84AT-20/SS is well suited as a front-end MCU that reads a digital sensor (e.g., DS18B20, DHT22, or simple SPI ADC) and forwards the value over UART or a bit-banged protocol. The 68 bytes of RAM accommodate a small command/state-machine buffer, and the 64-byte EEPROM retains calibration constants across power cycles. The 4.0 V minimum supply also pairs naturally with 5V sensor modules still common in industrial measurement.
تجویز کردہ
Industrial Control Retrofits
The PIC16F84AT-20/SS is a common BOM item for legacy industrial control boards and retrofits where the original PIC16F84 (non-'A' revision) is being obsoleted. Its Flash memory supports ICSP firmware updates in the field, and the 13 I/O pins can drive opto-isolated inputs and relay outputs for PLC I/O expansion modules. The 20 MHz clock provides deterministic scan times suitable for sub-millisecond safety interlocks. Long Microchip product lifecycle support means production lines built on the 16F84A can be maintained for decades.
تجویز کردہ
Low-Cost Consumer Appliance Controllers
Coffee machines, microwave ovens, and washing-machine user-interface boards often use a PIC16F84AT-20/SS to scan keypads, drive 7-segment or LCD displays, and sequence motor relays. The 64-byte EEPROM stores user presets and fault-history logs through power cycles, and the brown-out reset ensures clean startup after brown-outs. The 13 I/O drive LED multiplexing matrices directly without external drivers. The 5V supply aligns with the legacy rectifier-plus-7805 rails found in white goods.
تجویز کردہ
Remote Control and RF Encoder Sub-systems
The PIC16F84AT-20/SS is frequently used in 433 MHz / 315 MHz ISM-band remote controls as the encoder MCU, bit-banging Manchester or PWM coding into a SAW-transmitter module. Its 20 MHz clock gives precise 1 us timing resolution needed to stay within ISM-bandwidth regulatory limits. The 13 I/O handle matrix keypads directly, and the ICSP interface lets manufacturers field-update rolling-code schemes without retooling. Low sleep current (typ. <1 uA in nanoWatt mode) extends battery life.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا PIC16F84AT-20/SS — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | PIC16F84A-20/SS | PIC16F84AT-04/SS | PIC16F84A-20I/SS | PIC16F628A-20/SS | PIC16F88-I/SS |
|---|---|---|---|---|---|---|
| Package | SSOP-20 (5.30 mm) | SSOP-20 (5.30 mm) - same | SSOP-20 (5.30 mm) - same | SSOP-20 (5.30 mm) - same | SSOP-20 (5.30 mm) - same | SSOP-20 (5.30 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Frequency | 20 MHz | 20 MHz | 4 MHz (-80%) | 20 MHz | 20 MHz | 20 MHz |
| Program Memory (Flash) | 1.75 KB | 1.75 KB | 1.75 KB | 1.75 KB | 3.5 KB (+100%) | 7 KB (+300%) |
| Data RAM | 68 bytes | 68 bytes | 68 bytes | 68 bytes | 224 bytes (+229%) | 368 bytes (+441%) |
| Data EEPROM | 64 bytes | 64 bytes | 64 bytes | 64 bytes | 128 bytes (+100%) | 256 bytes (+300%) |
| Supply Voltage | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 2.0 V to 5.5 V (wider) | 2.0 V to 5.5 V (wider) |
| Operating Temperature | -40C to +85C | 0C to +70C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| USART / PWM / ADC | None | None | None | None | USART + PWM + comparator | AUSART + PWM + 10-bit ADC |
| Unit Price (1 pc, USD) | $2.49 | ~$2.40 | ~$2.49 | ~$2.55 | ~$2.10 | ~$2.75 |
اہم امتیازی خصوصیات
- Tape-and-reel packaging for SMT production (بمقابلہPIC16F84A-20/SS)
- Faster -20 speed grade (20 MHz vs 4 MHz) (بمقابلہPIC16F84AT-04/SS)
- Wide installed base and tutorial ecosystem (بمقابلہPIC16F628A-20/SS)
ڈیزائن نوٹس
The PIC16F84AT-20/SS requires a stable 4.0 V to 5.5 V supply with bulk decoupling of 100 nF ceramic + 10 uF electrolytic placed within 5 mm of VDD (pin 20) and VSS (pin 5/14). The brown-out reset (BOR) is factory-trimmed for 4.0 V typical; designs using 3.3 V sensors must either boost VDD with a charge pump or replace the MCU. The internal power-up timer holds the part in reset for ~72 ms - no external RC delay is needed on MCLR.
Do not confuse the PIC16F84A with the original PIC16F84 (non-A revision). The PIC16F84A adds 4x program memory and improved EEPROM endurance, but the instruction set and register map are otherwise identical. Also note that pin 19 of the SSOP-20 is not bonded out as a unique function - it shares the RA4/TOCKI function with pin 3 in some package variants; consult the Microchip datasheet pinout diagram before routing PCB pads near pin 19.
For SSOP-20 layouts, use 0.4 mm wide copper pads with 0.65 mm pitch, a 0.4 mm solder mask dam, and a NSMD (non-solder-mask-defined) land pattern per IPC-7351. Place the decoupling cap on the same copper layer as the IC pads to minimize loop inductance. The MCLR/VPP pin requires a 10 kohm pull-up to VDD and a 100 nF capacitor to VSS to filter ESD; do not leave it floating in production boards.
OSC1/OSC2 traces should be as short as possible (<10 mm), surrounded by a ground guard ring, and routed away from RB6/RB7 ICSP lines to avoid capacitive coupling that can cause programming failures. If using a high-speed crystal (>10 MHz), add a 10-33 pF load capacitor on each OSC pin to VSS; the exact value depends on crystal CL specification. RS-232 or other noise sources within 5 mm of OSC traces will inject jitter into the instruction cycle.
تعمیل کی معلومات
RoHS and lead-free compliant per Microchip product page. AEC-Q100 qualification is not formally listed on the datasheet; the -40C to +85C industrial grade is a temperature-grade designation, not an automotive qualification.
