PIC16F636-I/ML - 8-Bit MCU, 20MHz, KeeLoq, QFN-16 | Microchip
MPN: PIC16F636-I/ML ✓ AktifPIC16F636-I/ML Ringkasan
An 8-bit microcontroller is an integrated circuit that combines a processor core, program memory, data memory and peripherals on a single chip, sitting at the low end of the embedded-control hierarchy within the broader microcontroller and power/system-management ecosystem. The PIC16F636 belongs to Microchip's PIC16 family of mid-range RISC MCUs, executing one instruction per cycle except for branches, with only 35 single-word instructions to learn.
Key features include a KeeLoq-compatible cryptographic module for secure remote-key and authentication designs, two analog comparators, a Programmable Low-Voltage Detect (PLVD) module, and 128 bytes of SRAM. The nanoWatt technology power-management feature set supports low average current in battery-powered products.
Technically, the device uses Microchip's 14-bit wide instruction word Harvard architecture with a hardware stack, and peripheral set including a 16-bit timer, an 8-bit timer, and serial connectivity including SPI. The 20 MHz oscillator options cover internal and external clocking modes.
Typical applications are secure remote keyless entry, RF authentication fobs, small appliance control, battery-operated sensor nodes, and industrial sub-systems that benefit from the on-chip crypto engine and comparators.
Designers should budget the single 128-byte SRAM bank carefully, as KeeLoq routines consume RAM, and use the PLVD module to detect brown-out conditions before the flash write voltage floor is crossed.
This page adds value beyond the manufacturer datasheet by combining distributor availability signals, drop-in alternatives, comparison tables and practical design notes in one place.
Pilihan pengganti yang segera untuk PIC16F636-I/ML — sama paket, pin-pin kompatibel. Bahagian paket yang berbeza memerlukan kerja ulang PCB diasingkan.
Varietas dalam siri ini
Model serupa yang kompatibel dengan pengganti yang segera PIC16F636-I/ML (sama faktor bentuk dan kaki) — berbeza dalam Package, Core, Maximum CPU Frequency, Operating Temperature Range.
PIC16F630-I/ML
✅ Masuk Drop-InHubungi untuk harga
Lihat Datasheet →PIC16F1703-I/ML
✅ Masuk Drop-InHubungi untuk harga
Lihat Datasheet →PIC16F18025T-I/ML
✅ Masuk Drop-In📋 Alternatif rujukan (tidak dalam katalog)
PIC16LF1614-E/ML
✅ Masuk Drop-In📋 Alternatif rujukan (tidak dalam katalog)
PIC16F636-I/ML Penilaian maksimum & Ciri-ciri Elektrik
| Core | PIC16 8-bit RISC |
| Max Clock Frequency | 20 MHz |
| Flash Program Memory | 3.5 KB (2K x 14 words) |
| SRAM | 128 bytes |
| EEPROM Data Memory | 256 bytes |
| Instruction Set | 35 single-word instructions |
| I/O Count | 12 |
| Comparators | 2 analog comparators |
| Cryptographic Module | KeeLoq compatible |
| Low-Voltage Detect | Programmable LVD (PLVD) |
| Serial Interfaces | SPI connectivity |
| Tegangan Pemberi Arus | 4.5 V to 5.5 V (per digchip listing) |
| Technology | nanoWatt technology, CMOS Flash |
| Kemasan | 16-QFN (4x4 mm) |
| Suhu Operasi | -40C to +85C (I grade) |
| Jenis Pemasangan | Surface Mount |
| Status Lingkungan Hidup | Active |
Panduan Konfigurasi Pin PIC16F636-I/ML 16-qfn (4x4 mm)
Konfigurasi pin untuk PIC16F636-I/ML (16-qfn (4x4 mm) pakai). IC digital ini termasuk GPIO, antaramuka komunikasi (UART, SPI, I2C), dan pin kuasa. Rujuk dokumen pengeluar untuk fungsi pin alternatif dan opsi konfigurasi. Biasa digunakan dalam rancangan sistem ter嵌入式 dan PCB.
Tiada data garisan pin yang diperoleh untuk PIC16F636-I/ML.
Rujuk kepada lembaran data untuk konfigurasi pin penuh.
Aplikasi Biasa
PIC16F636-I/ML patut untuk 6 aplikasis: Remote Keyless Entry (RKE) Systems, Secure Access Control and Authentication Fobs, Battery-Powered Sensor Nodes, Small Appliance and Consumer Control, Industrial Sub-Systems and Legacy Design Continuity, Motorized Lock and Security Latch Control.
Remote Keyless Entry (RKE) Systems
The PIC16F636-I/ML fits remote keyless entry designs because its on-chip KeeLoq-compatible cryptographic module implements rolling-code authentication without an external security IC, cutting BOM cost and board area in compact fob enclosures. The two analog comparators discriminate simple RF or button-sense signals, while the 256-byte EEPROM stores encryption keys through power cycles. In a typical RKE transmitter, the MCU sleeps in nanoWatt mode at sub-microamp current, wakes on a button press, encrypts a rolling code at up to 20 MHz and modulates an RF stage via SPI or GPIO. The PLVD module warns firmware as the coin-cell discharges before EEPROM writes fail, protecting key data. Quantitatively, the 12 I/O lines cover buttons, LEDs and RF enable with pins to spare in a 4x4 mm QFN.
Disebarkan
Secure Access Control and Authentication Fobs
For access-control tokens, the PIC16F636-I/ML pairs the 3.5 KB Flash program space with the KeeLoq-compatible crypto engine to run challenge-response authentication end-to-end on one chip. The 256-byte EEPROM retains per-device secret keys across battery replacement, and the industrial -40C to +85C grade survives outdoor reader and fob environments. Firmware executes the 35-instruction PIC16 core at up to 20 MHz, so a full KeeLoq computation completes within tens of milliseconds - fast enough for user-interactive door or gate access. The two comparators can supervise card-present or tamper signals without an external analog part, and the PLVD brown-out detector prevents corrupted key writes during battery removal. Designers should reserve SRAM headroom in the 128-byte bank for crypto working variables and key buffers.
Disebarkan
Battery-Powered Sensor Nodes
The PIC16F636-I/ML suits battery-operated sensor nodes because nanoWatt technology keeps sleep current in the microamp-to-nanoamp region while the 20 MHz core is available on demand for burst processing. The two analog comparators form simple threshold detectors that can wake the MCU from sleep when a sensor crosses a limit, avoiding continuous ADC polling; the PLVD module doubles as a battery-health monitor so the node can flag low-battery status before data loss. With 12 I/O lines and SPI connectivity, one chip drives sensor interfaces, status LEDs and a radio or wired link. In a 3-cell or 5 V node, the device runs its sensing routine in milliseconds and returns to sleep, stretching battery life from months to years in typical duty-cycled deployments.
Disebarkan
Small Appliance and Consumer Control
In appliances and consumer devices, the PIC16F636-I/ML acts as a compact, low-cost control MCU: the PIC16 core executes user-interface state machines, the two comparators supervise over-temperature or over-current thresholds without an external supervisor, and the 256-byte EEPROM stores user settings such as mode and calibration through power cycles. The 4x4 mm QFN fits slim control panels, and the -40C to +85C industrial temperature grade tolerates unventilated enclosures. The 12 I/O lines handle buttons, LEDs, relays and buzzer drive; the PLVD brown-out detection ensures EEPROM writes complete safely during mains dips. With only 35 instructions and a mature toolchain, firmware is small - typically well within the 2K x 14 Flash - leaving room for feature updates across product variants.
Disebarkan
Industrial Sub-Systems and Legacy Design Continuity
The PIC16F636-I/ML serves industrial sub-systems - pump controllers, actuator boards, sensor conditioners - where a small, robust MCU supervises logic while a larger processor runs the application. Its comparators detect fault conditions in hardware, the PLVD flags brown-out before Flash corruption, and the industrial temperature rating plus CMOS Flash technology withstands panel environments. The 20 MHz 5 MIPS core handles watchdog, sequencing and communication duties with deterministic timing, and the SPI interface links to transceivers or memory. For legacy boards already designed around the PIC16F636, keeping the same QFN-16 footprint simplifies ongoing production; for new industrial designs, the same-footprint PIC16F18025 offers ten times the memory and modern peripherals while reusing the existing PCB land pattern.
Disebarkan
Motorized Lock and Security Latch Control
Motorized locks benefit from the PIC16F636-I/ML's combination of secure key storage and drive control: the EEPROM holds authentication keys, the KeeLoq module validates rolling-code credentials from remote fobs, and GPIO plus comparator inputs manage motor end-stop detection and tamper switches. The PLVD brown-out detector guarantees that a partially written key is rolled back or flagged if power fails mid-update - a common failure mode in latch electronics. Running at 20 MHz, credential validation completes in well under 100 ms, keeping perceived access latency low. The 4x4 mm QFN mounts on compact lock control boards, and the industrial temperature range covers door-frame installations exposed to outdoor temperatures. Firmware partitioning keeps the crypto routines isolated from motor-control code for reliability.
Disebarkan
Ringkasan Produk Disebarkan
Data referensi kejuruteraan untuk PIC16F636-I/ML — perbandingan, panduan rancangan, dan maklumat kesediaan
Panduan Pilihan
Perbandingan dengan Gantian
| Parametr | Produk Ini | PIC16F630-I/ML | PIC16F1703-I/ML | PIC16F18025T-I/ML | PIC16LF1614-E/ML |
|---|---|---|---|---|---|
| Package | 16-QFN (4x4 mm) | 16-QFN (4x4 mm) - same | 16-QFN (4x4 mm) - same | 16-QFN (4x4 mm) - same | 16-QFN (4x4 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| KeeLoq Crypto Module | Yes | No | No | No | No |
Penyeberangsung Jelas
- On-chip KeeLoq-compatible cryptographic module (vsPIC16F630-I/ML)
- 256 bytes of EEPROM vs 128 bytes (vsPIC16F630-I/ML)
- Purpose-built security MCU vs general-purpose successors (vsPIC16F1703-I/ML)
Catatan Desain
Budget the single 128-byte SRAM bank before committing to KeeLoq firmware. The KeeLoq decryption/encryption routines consume working RAM for key and buffer variables, and the PIC16 mid-range core has no hardware multiply or C-friendly addressing, so naive C code can overflow the bank. Microchip's KeeLoq application libraries document their RAM requirements - verify your code fits with margin, and prefer assembly-optimized library routines for the crypto inner loops to reduce both RAM and cycle count.
The 16-QFN (4x4 mm) ML package has an exposed pad on the underside that must be soldered to a grounded PCB land. Use a nominally solder-mask-defined land pattern with approximately 65-75% stencil coverage on the center pad to avoid excessive solder paste voiding that lifts the package during reflow. Add four thermal vias under the pad to the ground plane. Per Microchip QFN packaging application guidance, verify the land pattern against the current datasheet mechanical drawing before layout release.
The PLVD (Programmable Low-Voltage Detect) module is your first line of defense for EEPROM integrity. Configure the PLVD trip point above the minimum Flash/EEPROM write voltage so firmware can suspend writes or migrate data before brown-out corrupts the 256-byte EEPROM. In battery-powered RKE fobs, combine PLVD interrupts with nanoWatt sleep modes: sleep with PLVD enabled so a falling battery triggers an interrupt rather than a silent data loss. Estimated: at coin-cell discharge rates, early PLVD warning extends usable key lifetime substantially versus undetected brown-out writes.
Keep the ICSP (In-Circuit Serial Programming) traces - clock, data, VPP/MCLR and VDD - routed to a 5-pin header even in production boards. The QFN-16 package makes rework difficult if the firmware needs field updates or the EEPROM keys must be programmed post-assembly. Per Microchip programming specifications, keep ICSP trace lengths short and add a series resistor on MCLR if the pin is also used as an input, so the programmer can drive it to the programming voltage without contention.
Maklumat Kesediaan
Compliance status not stated in the retrieved listings. Microchip standard commercial PIC16 parts are typically RoHS-compliant, but confirm on the official Microchip product page before order release.
