PIC16LF84A-04/SS - 8-bit 4MHz 1.75KB Flash MCU 20-SSOP | Microchip
MPN: PIC16LF84A-04/SS ✓ Hoạt độngPIC16LF84A-04/SS Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, RAM, I/O peripherals, and timers onto one silicon die. The PIC16 family belongs to the mid-range 8-bit tier in the broader taxonomy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. Within the PIC portfolio, mid-range parts are designed for low-power, cost-sensitive applications and serve as the workhorse for consumer, industrial, and educational designs.
Key features include a wide operating voltage range of 1.8 V to 3.6 V, low-power CMOS technology suitable for battery operation, an internal oscillator option on the LF variant, a 10-bit timer/counter, a Watchdog Timer with on-chip RC oscillator, in-circuit serial programming (ICSP), and 8-bit parallel slave port. The device supports in-system programming through two pins, allowing firmware updates after PCB assembly.
The PIC16LF84A architecture separates program and data buses (Harvard), and the LF variant extends supply down to 1.8 V for portable and battery-powered designs. Its 4 MHz maximum clock rate, 14-bit instruction word, and a deep 8-level hardware stack give it predictable interrupt performance for time-critical control loops.
Typical applications include low-power remote sensors, battery-powered consumer devices, HVAC controls, simple motor control, LED drivers, learning platforms, hobbyist projects, and replacement of legacy PIC16F84A designs in industrial controllers. The 20-SSOP footprint offers a compact alternative to the 18-pin DIP/PDIP and 18-pin SOIC variants of the same die.
When designing, note that the LF version's 1.8 V minimum supply is required for low-voltage operation; the standard 'F' (non-L) variant operates at 2.0 V to 5.5 V. Pin-compatible migration between 18-pin and 20-pin SSOP packages requires PCB adaptation due to differing pin counts.
This page synthesizes distributor stock, same-family Microchip alternatives, and practical design notes not aggregated in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC16LF84A-04/SS — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC16LF84A-04/SS (cùng hình factor và footprint) — khác nhau ở Package, Timers, Watchdog Timer, Operating Temperature, Core Architecture.
PIC16LF84A-04I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF84AT-04/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F84A-04/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF84A-04/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF84A-04/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF84A-04/SS Tỷ lệ tối đa & tính chất điện
| Core | PIC16 8-bit RISC |
| Instruction Set | 35 single-word instructions |
| Program Memory (Flash) | 1.75 KB (1K x 14 words) |
| RAM | 68 bytes |
| EEPROM Data Memory | 64 bytes |
| Maximum Clock Speed | 4 MHz |
| Instruction Execution Time | 200 ns at 4 MHz |
| Supply Voltage (VDD) | 1.8 V to 3.6 V |
| I/O Pins | 13 |
| Timers | 1 x 8-bit Timer0 with prescaler |
| Watchdog Timer | Yes (with dedicated on-chip RC oscillator) |
| In-Circuit Serial Programming (ICSP) | Yes (2-wire) |
| Parallel Slave Port | Yes (8-bit, PORTB) |
| Khoảng nhiệt độ hoạt động | 0C to +70C (commercial) |
| Hộp | 20-pin SSOP |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân PIC16LF84A-04/SS
| Chân 1 | RA2 — Port A bit 2 / analog/digital I/O |
| Chân 2 | RA3 — Port A bit 3 / digital I/O |
| Chân 3 | RA4/T0CKI — Port A bit 4 / Timer0 clock input (open-drain) |
| Chân 4 | MCLR/VPP — Master Clear reset / programming voltage input |
| Chân 5 | VSS — Ground reference |
| Chân 6 | RB0/INT — Port B bit 0 / external interrupt input |
| Chân 7 | RB1 — Port B bit 1 / digital I/O |
| Chân 8 | RB2 — Port B bit 2 / digital I/O |
| Chân 9 | RB3 — Port B bit 3 / digital I/O |
| Chân 10 | RB4 — Port B bit 4 / interrupt-on-change |
| Chân 11 | RB5 — Port B bit 5 / interrupt-on-change |
| Chân 12 | RB6/PGC — Port B bit 6 / ICSP clock (ICSPCLK) |
| Chân 13 | RB7/PGD — Port B bit 7 / ICSP data (ICSPDAT) |
| Chân 14 | VDD — Positive supply voltage (1.8 V to 3.6 V) |
| Chân 15 | OSC2/CLKOUT — Oscillator output / clock out |
| Chân 16 | OSC1/CLKIN — Oscillator input / external clock in |
| Chân 17 | RA0 — Port A bit 0 / digital I/O |
| Chân 18 | RA1 — Port A bit 1 / digital I/O |
| Chân 19 | RA5/SS — Port A bit 5 / slave select (not present on 18-pin DIP variant) |
| Chân 20 | NC — Not connected on this die variant / reserved |
Ứng dụng tiêu biểu
PIC16LF84A-04/SS phù hợp cho 6 Áp dụngs: Battery-Powered Remote Sensor Nodes, HVAC and Building Automation Controllers, Consumer Remote Controls and IR Toys, LED Lighting Controllers and Drivers, Legacy Industrial Control Board Replacement, Educational Microcontroller Training Kits.
Battery-Powered Remote Sensor Nodes
The PIC16LF84A-04/SS is well suited for battery-powered remote sensor nodes because of its 1.8 V to 3.6 V low-voltage supply range and CMOS process. With a 4 MHz clock and CMOS I/O, the part typically draws 1-3 mA active and a few microamps in sleep mode, supporting multi-year coin-cell life in intermittent sampling applications. The 13 digital I/O pins can directly interface temperature, humidity, or PIR sensors without level shifters, and the 64-byte EEPROM stores calibration coefficients that survive battery swaps. Designers wire the Watchdog Timer to the on-chip RC oscillator for autonomous reset behavior, avoiding external supervisory parts.
Được đề xuất
HVAC and Building Automation Controllers
The PIC16LF84A-04/SS fits HVAC zone controllers, thermostats, and building automation I/O expanders where 3.3 V logic is the norm. Its 8-bit Parallel Slave Port on PORTB allows the part to act as an I/O extender on a Modbus or BACnet master controller, offloading keypad scanning, LED multiplexing, and relay drive. The Watchdog Timer with dedicated on-chip RC oscillator prevents lockup in unattended installations. Flash-based firmware supports field updates via ICSP through a service header, allowing HVAC technicians to upgrade sensor tables after installation without desoldering the MCU.
Được đề xuất
Consumer Remote Controls and IR Toys
The PIC16LF84A-04/SS is commonly used in low-cost IR remote controls, educational toys, and consumer appliances because of its 35-instruction RISC simplicity and small 20-SSOP footprint. With 1.75 KB Flash, the part easily fits NEC, RC5, or Sony SIRC IR protocol code plus a user-mode state machine. The LF variant's 1.8 V supply enables direct Li-ion or two-AAA battery operation. The PORTB interrupt-on-change feature wakes the MCU from sleep on any button press, achieving sub-10 uA standby current. PICkit programmers ship with sample code that accelerates hobbyist development.
Được đề xuất
LED Lighting Controllers and Drivers
The PIC16LF84A-04/SS serves as a sequencer for decorative LED strips, addressable pixel tape (WS2811/WS2812), and signage controllers. Its 13 I/O pins drive 8-10 LED channels directly through MOSFET gates, while the 200 ns instruction cycle sustains bit-banged PWM refresh at 30 fps on a 60-pixel strip. The 64-byte EEPROM stores user color presets and animation modes that survive power cycles. Designers use Timer0 with a prescaler to generate the 800 kHz WS2812 reset/data timing without burdening the CPU loop.
Được đề xuất
Legacy Industrial Control Board Replacement
The PIC16LF84A-04/SS is widely specified for legacy industrial control boards where customers maintain spares for 10-15 year service life. The 20-SSOP footprint matches existing PCB land patterns designed in the early 2000s, and the same PIC16F8X instruction set allows drop-in firmware migration. Its 0C to +70C commercial operating range suits indoor control panels and OEM equipment rooms. With 1.75 KB Flash and 68 bytes RAM, the part runs the same ladder-logic-replacement state machines that have shipped in industrial controllers for two decades.
Được đề xuất
Educational Microcontroller Training Kits
The PIC16LF84A-04/SS is a common teaching platform in university microcontroller courses because of its simple RISC architecture and abundant example code. Its 35-instruction set can be learned in a single lab session, while the 1.75 KB Flash is large enough for real assignments like I2C bit-banging, UART polling, and timer-based PWM. The 20-SSOP package fits breakout boards designed for breadboarding, and ICSP allows instructors to flash firmware in class without UV erasers. Student kits commonly ship with PICkit programmers and MPLAB X IDE integration.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LF84A-04/SS — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC16LF84A-04I/SS | PIC16LF84AT-04/SS | PIC16F84A-04/SS | PIC16LF84A-04/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP | 18-SOIC |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 2.0 V to 5.5 V | 1.8 V to 3.6 V |
| Maximum Clock | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Program Memory (Flash) | 1.75 KB (1K x 14) | 1.75 KB | 1.75 KB | 1.75 KB | 1.75 KB |
| RAM | 68 bytes | 68 bytes | 68 bytes | 68 bytes | 68 bytes |
| I/O Pins | 13 | 13 | 13 | 13 | 13 |
| Operating Temperature | 0C to +70C | -40C to +85C | 0C to +70C | 0C to +70C | 0C to +70C |
Bảo phân biệt quan trọng
- Low-voltage operation to 1.8 V vs 2.0 V on standard F84A (vsPIC16F84A-04/SS)
- Industrial temperature grade -40C to +85C (vsPIC16LF84A-04/SS (this part, commercial))
- Same die in 20-SSOP compact surface-mount package (vsPIC16LF84A-04/P)
Ghi chú thiết kế
The PIC16LF84A-04/SS draws a few microamps in sleep mode, but VDD decoupling is still mandatory. Place a 100 nF ceramic capacitor between VDD (pin 14) and VSS (pin 5) within 5 mm of the package. For battery applications adding a bulk 10 uF tantalum or ceramic improves brownout recovery. Note that the LF variant's internal EEPROM write current peaks at ~3 mA, so factor headroom into battery impedance calculations.
Keep the ICSP clock (PGC, pin 12) and ICSP data (PGD, pin 13) traces short and routed together; signal integrity directly affects programming reliability. Place MCLR/VPP (pin 4) pull-up (typically 10 kohm) close to the pin, and add a series resistor (around 470 ohm) plus diode to VDD for in-circuit programming isolation when other circuitry drives MCLR. The 20-SSOP fine-pitch pads benefit from a small ground pour under the package to assist thermal dissipation.
The 'LF' prefix is critical: the LF version has a 1.8 V minimum VDD, the non-LF PIC16F84A starts at 2.0 V. Dropping the LF part below 1.8 V causes EEPROM read errors and brownout misbehavior. Avoid confusing the 20-SSOP 'PIC16LF84A-04/SS' with the 18-pin DIP 'PIC16LF84A-04/P' - they share the same die but have different pin counts and pinouts. Programming the wrong part on a 20-pin PCB land pattern will short internal pads to the wrong traces.
Estimated: at 4 MHz clock with a 50 pF/trace capacitance budget on the OSC1/OSC2 lines, total pin capacitance is roughly 20 pF. Use a crystal or ceramic resonator with load capacitance rated between 15 and 33 pF to keep oscillator startup time under 10 ms. For low-power designs using the internal RC oscillator (not present on this die but common on F84A alternatives), trim the OSCCAL register to within 2% for UART timing accuracy.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Not AEC-Q100 qualified; for automotive applications use PIC16F84A-04/SS (industrial) with customer-side qualification.
