PIC16F636-I/ST - 8-bit MCU, 3.5KB Flash, 20MHz | Microchip
MPN: PIC16F636-I/ST ✓ Hoạt độngPIC16F636-I/ST Tóm tắt
An 8-bit microcontroller (MCU) is a small, self-contained computer-on-a-chip that integrates a CPU, program memory, RAM, peripherals and I/O in a single package. The PIC mid-range architecture places the PIC16F636 inside the broader hierarchy: 8-bit microcontroller -> RISC microcontroller -> microcontroller -> embedded IC -> semiconductor device. Microchip's PIC mid-range family is widely adopted in low-power, cost-sensitive embedded designs because of its compact instruction set (35 single-word instructions), deterministic interrupt latency and an 8-level deep hardware stack.
Key features include a factory-calibrated internal oscillator accurate to ±1%, a flash endurance of 100K cycles, and an operating temperature range of -40C to +85C for the industrial -I grade. The device supports in-circuit serial programming (ICSP) and in-circuit debugging, simplifying firmware bring-up. An integrated 256-byte EEPROM provides non-volatile data storage for calibration constants, security keys and rolling-code parameters without external memory, which is critical for KeeLoq-compatible remote-keyless-entry (RKE) and secure-access designs.
The PIC16F636 uses Microchip's Harvard RISC architecture with a 14-bit wide instruction word and separate data paths for program and data memory, enabling single-cycle instruction execution except for branches. Its 5 MIPS performance is more than sufficient for timing-sensitive control loops and basic state-machine firmware. Two comparators with programmable on-chip references simplify analog front-ends such as battery voltage and current sensing.
Typical applications include remote-keyless-entry (RKE) transmitters, secure-access key fobs, low-end security sensors, simple motor control, and battery-powered appliance control where small footprint, on-chip EEPROM and KeeLoq security provide decisive BOM savings. Designers value the part for sub-1 mA active current and long-life battery budgets.
When designing with this part, mind the 14-pin TSSOP package thermal envelope in high-ambient enclosures and ensure the ICSP/ICD pins (RB6/RB7) are accessible for production programming. Pin assignments of the 14-TSSOP package must be verified against the device pinout table before PCB layout.
Bộ thay thế dễ dàng lắp đặt cho PIC16F636-I/ST — 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 PIC16F636-I/ST (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, Core Architecture, ADC, Internal Oscillator.
PIC16F636-E/ST
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F636T-I/ST
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F630-I/ST
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F616-I/ML
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F631-I/SO
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F636-I/ST Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC mid-range 8-bit RISC |
| Program Memory (Flash) | 3.5 KB (2K x 14 words) |
| Data RAM | 128 bytes |
| Data EEPROM | 256 bytes |
| Maximum Clock Speed | 20 MHz |
| Instruction Throughput | 5 MIPS |
| Instruction Set Size | 35 single-word instructions |
| Hardware Stack | 8 levels |
| I/O Pins | 12 |
| Điện áp cung cấp | 4.5 V to 5.5 V |
| On-chip Oscillator | Factory-calibrated internal RC, ±1% accuracy |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial -I grade) |
| Hộp | 14-TSSOP (4.40 mm body width, ST suffix) |
| Kiểu lắp đặt | Surface Mount |
| Peripherals | KeeLoq crypto module, PLVD, 2 comparators |
| Programming/Debug | ICSP and in-circuit debugger on RB6/RB7 |
| Flash Endurance | 100K erase/write cycles (typical) |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC16F636-I/ST
| Chân 1 | VDD — Positive supply voltage (4.5V to 5.5V) |
| Chân 2 | RA5/OSC1/CLKIN — General I/O / oscillator input / external clock input |
| Chân 3 | RA4/OSC2/CLKOUT — General I/O / oscillator output / clock output |
| Chân 4 | RA3/MCLR/VPP — General I/O / Master Clear (active-low reset) / programming voltage |
| Chân 5 | RC5 — General I/O port C bit 5 |
| Chân 6 | RC4 — General I/O port C bit 4 |
| Chân 7 | RC3 — General I/O port C bit 3 |
| Chân 8 | RC2 — General I/O port C bit 2 |
| Chân 9 | RC1 — General I/O port C bit 1 |
| Chân 10 | RC0 — General I/O port C bit 0 |
| Chân 11 | RA2/AN2/CVREF — General I/O / analog input 2 / comparator voltage reference output |
| Chân 12 | RA1/AN1/C1IN- — General I/O / analog input 1 / comparator 1 inverting input |
| Chân 13 | RA0/AN0/C1IN+ — General I/O / analog input 0 / comparator 1 non-inverting input |
| Chân 14 | VSS — Ground reference (0 V) |
Ứng dụng tiêu biểu
PIC16F636-I/ST phù hợp cho 6 Áp dụngs: KeeLoq Remote Keyless Entry (RKE) Transmitters, Garage Door Openers and Gate Controls, Battery-Powered Security Sensors, Industrial Remote Control Handsets, Small Appliance and Consumer Electronics Control, Automotive Aftermarket Alarm Systems.
KeeLoq Remote Keyless Entry (RKE) Transmitters
The PIC16F636-I/ST is purpose-built for KeeLoq-compatible secure RKE key fobs where 256-byte on-chip EEPROM stores rolling-code keys and 12 I/O lines drive push-buttons, LED indicators and SAW-resonator-based RF transmitters. The on-chip KeeLoq hardware engine handles encryption and decryption of 32-bit hopping-code transmissions at the 5 MIPS throughput the device delivers, enabling under-20 ms code-response latency with low MCU load. Battery life benefits from the part's low active current and ability to wake from interrupt on button-press, making it ideal for coin-cell-powered key fobs where standby drain directly determines service interval.
Được đề xuất
Garage Door Openers and Gate Controls
Garage door openers and gate controllers benefit from the PIC16F636-I/ST's KeeLoq crypto module and 256-byte EEPROM for storing secure rolling codes shared with the receiver module. The 20 MHz instruction rate supports sub-100 ms button-to-RF transmission cycles while the 14-TSSOP package simplifies integration into hand-held transmitter housings. Two on-chip comparators can monitor battery voltage through an external resistor divider, triggering low-battery warning transmissions before the cell becomes unreliable, an important safety consideration for residential and commercial access-control deployments.
Được đề xuất
Battery-Powered Security Sensors
Wireless PIR motion, door/window contact, and glass-break sensors pair well with the PIC16F636-I/ST in 5V coin-cell or AA-powered designs. The factory-calibrated ±1% internal RC oscillator eliminates crystal cost and reduces PCB area, while the 256-byte EEPROM stores calibration coefficients and zone identifiers. The on-chip PLVD (Programmable Low-Voltage Detect) module generates an interrupt below a user-set Vdd threshold, allowing the firmware to send a 'low-battery' event over RF before cell voltage collapses. With 12 I/O pins the MCU directly drives PIR analog, reed-switch inputs, status LEDs and a low-power RF transmitter.
Được đề xuất
Industrial Remote Control Handsets
Crane, hoist and industrial equipment remote-control handsets leverage the PIC16F636-I/ST's KeeLoq hardware module for secure command authentication, reducing the risk of replay or spoofed-control events. The 12 I/O pins support multi-button joysticks, deadman switches and emergency-stop wiring with hardware interrupts, while the 5V industrial supply rail is directly compatible with the 4.5 V to 5.5 V Vdd range. The industrial -I temperature grade (-40 C to +85 C) covers outdoor and factory-ambient operation, and the 14-TSSOP package withstands vibration typical of heavy-machinery cabs.
Được đề xuất
Small Appliance and Consumer Electronics Control
Coffee makers, rice cookers, blenders and similar small appliances use the PIC16F636-I/ST for cost-sensitive user-interface and timing control. The 5 MIPS throughput drives PWM outputs for motor-speed or heater control loops while 256 bytes of EEPROM store user-preset cooking profiles. Two comparators monitor temperature thermistor voltages with on-chip programmable voltage reference, eliminating the need for external analog comparators. The 14-TSSOP package keeps board cost low in high-volume SKUs while the 35-instruction RISC core enables short firmware cycles for time-to-market advantage.
Được đề xuất
Automotive Aftermarket Alarm Systems
Aftermarket automotive alarm and anti-theft modules employ the PIC16F636-I/ST for key-fob authentication via KeeLoq rolling code and for in-vehicle sensor monitoring. The PIC's two comparators interface directly with shock, tilt and glass-break sensors, while 12 I/O lines drive sirens, indicator LEDs and starter-kill relays. Although the -I industrial grade covers most climate conditions, automotive deployments at extreme temperatures can substitute the PIC16F636-E/ST (extended -40 C to +125 C grade) without firmware change. Designers should add external ESD protection on automotive connector pins.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F636-I/ST — 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 | PIC16F636-E/ST | PIC16F636T-I/ST | PIC16F630-I/ST | PIC16F631-I/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 14-TSSOP (ST) | 14-TSSOP (ST) - same | 14-TSSOP (ST) - same | 14-TSSOP (ST) - same | SOIC-14 (cross-package, but pin-compatible) |
| Program Memory (Flash) | 3.5 KB | 3.5 KB | 3.5 KB | 1 KB | 1.75 KB |
| Data RAM | 128 bytes | 128 bytes | 128 bytes | 64 bytes | 128 bytes |
| Data EEPROM | 256 bytes | 256 bytes | 256 bytes | None | 256 bytes |
| KeeLoq Crypto Module | Yes (on-chip) | Yes (on-chip) | Yes (on-chip) | No | No |
| Operating Temperature | -40 C to +85 C (industrial -I) | -40 C to +125 C (extended -E) | -40 C to +85 C (industrial -I) | -40 C to +85 C (industrial -I) | -40 C to +85 C (industrial -I) |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
Bảo phân biệt quan trọng
- On-chip KeeLoq-compatible cryptographic hardware (vsPIC16F630-I/ST)
- 256 bytes of on-chip data EEPROM (vsPIC16F630-I/ST)
- Extended temperature grade option in same footprint (vsPIC16F636-E/ST (companion))
Ghi chú thiết kế
Estimated: For an RKE key fob running at 4 MHz internal oscillator, the PIC16F636-I/ST active current is below 1 mA typical at 5V. Sleep current drops to sub-1 µA when the CPU is halted and only the watchdog timer or interrupt-on-change wakes the part. Place a 100 nF decoupling capacitor within 5 mm of Vdd (pin 1) and a bulk 10 µF tantalum or ceramic on the battery terminal to handle the RF transmitter load transients.
Estimated: The 14-TSSOP package occupies roughly 5 mm x 4.4 mm with 0.65 mm pitch. Allow at least 0.20 mm trace-and-space rules on a 1 oz copper, two-layer FR-4 board to maintain manufacturability. Keep the Vdd trace short and wide (≥0.3 mm) and route the MCLR pull-up (typically 10 kOhm) directly to Vdd with no series inductance to ensure reliable in-circuit serial programming during production.
Do not omit the 10 kOhm MCLR pull-up on pin 4 (RA3/MCLR/VPP) - leaving MCLR floating makes the part vulnerable to brown-out reset and prevents ICSP entry. Configure CONFIG bits correctly in the hex file before programming to avoid locking out the part. When using the on-chip KeeLoq engine, follow Microchip's TB078 application note for EEPROM endurance and key-storage best practices to protect against side-channel attacks.
Thông tin tuân thủ
RoHS and lead-free confirmed on DigiKey and Mouser product pages. AEC-Q100 not qualified - for automotive safety-critical applications consider PIC16F636-E/ST with extended temperature grade or an AEC-Q100 qualified PIC16 family member. Halogen-free per Microchip's material declaration.
