PIC16C65B-20/PQ - 8-Bit 20MHz 7KB OTP MCU | Microchip
MPN: PIC16C65B-20/PQ ✓ Hoạt độngPIC16C65B-20/PQ Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and programmable peripherals into one IC. PIC microcontrollers use a Harvard architecture with separate program and data buses, an accumulator-based ALU, and a small instruction set. The 8-bit PIC mid-range family targets cost-sensitive embedded control in appliances, automotive body electronics, and industrial sensor interfaces where deterministic instruction timing and low part count matter more than raw compute throughput.
Key features include 33 digital I/O lines arranged across multiple ports (PORTA-PORTE), dual 8-bit timers plus one 16-bit timer, a Universal Synchronous Asynchronous Receiver Transmitter (USART), a Synchronous Serial Port (SSP) supporting SPI and I2C master/slave modes, and parallel slave port operation. An 8-channel 8-bit analog-to-digital converter is not present on this derivative, so the part targets purely digital designs. On-chip power-on reset, brown-out reset, watchdog timer with dedicated on-chip RC oscillator, and code protection support robust standalone deployment.
The PIC16C65B uses Microchip's mature CMOS process with an OTP EPROM program array, offering a 1,000 erase/write cycle minimum and indefinite read endurance. Code is programmed once by the user using a device programmer such as the MPLAB PM3. The 20 MHz part delivers a 200 ns instruction cycle, suitable for real-time control loops, keypad scanning, LED multiplexing, and protocol bridging where deterministic timing outperforms larger 32-bit cores that pay overhead for interrupts and pipelines.
Typical applications include industrial control panels, HVAC fan controllers, vending machine logic, security alarm keypads, automotive instrument cluster logic, and consumer appliance interface boards. The 33 I/O and USART/SSP combination lets engineers drive segment displays, matrix keypads, EEPROMs, sensors, and host serial links from a single 5V supply.
Designers should note that the OTP variant is one-time-programmable: any code revision requires a new device. Use the PIC16F877 (flash-based, same family migration path) for prototyping and field-updatable products; reserve the PIC16C65B for high-volume production once firmware is frozen.
This page synthesizes distributor pricing, same-package pin-compatible drop-in alternatives, and application engineering notes for engineers evaluating the PIC16C65B-20/PQ for new designs or end-of-life redesigns.
Bộ thay thế dễ dàng lắp đặt cho PIC16C65B-20/PQ — 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 PIC16C65B-20/PQ (cùng hình factor và footprint) — khác nhau ở ADC, Package, Timers, Core Architecture, Program Memory Size.
PIC16C65B-04/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C65B-20I/PQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C74B-20/PQ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F877-20/PQ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F877A-20/PQ
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C65B-20/PQ Tỷ lệ tối đa & tính chất điện
| Manufacturer | Microchip Technology |
| Product Family | PIC16CXX mid-range |
| Core Architecture | 8-bit RISC, Harvard |
| Program Memory Size | 7 KB (4K x 14) OTP |
| Data RAM Size | 192 bytes |
| Data EEPROM | None (OTP derivative) |
| Tần số xung maksimum | 20 MHz |
| Instruction Cycle | 200 ns (4 clocks per instruction) |
| Number of I/O Pins | 33 |
| Number of Timers | 3 (TMR0 8-bit + TMR1 16-bit + TMR2 8-bit) |
| ADC | Not present on this derivative |
| Communication Interfaces | USART (SCI), SSP (SPI / I2C), Parallel Slave Port |
| Điện áp cung cấp hoạt động | 2.5 V to 5.5 V |
| Nhiệt độ hoạt động | 0C to +70C (Commercial) |
| Hộp / Vỏ | 44-MQFP (10x10 mm) |
| Kiểu lắp đặt | Surface Mount (SMD/SMT) |
| Số chân | 44 |
| Program Memory Type | OTP (One-Time-Programmable EPROM) |
Cấu hình chân PIC16C65B-20/PQ
| Chân 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| Chân 2 | RA0/AN0 — PORTA bit 0 (digital I/O) |
| Chân 3 | RA1/AN1 — PORTA bit 1 (digital I/O) |
| Chân 4 | RA2/AN2 — PORTA bit 2 (digital I/O) |
| Chân 5 | RA3/AN3/VREF — PORTA bit 3 (digital I/O / reference voltage) |
| Chân 6 | RA4/T0CKI — PORTA bit 4 (digital I/O / Timer0 clock) |
| Chân 7 | RA5/SS/AN4 — PORTA bit 5 (digital I/O / SPI slave select) |
| Chân 8 | OSC1/CLKIN — Oscillator input / external clock |
| Chân 9 | OSC2/CLKOUT — Oscillator output / clock output |
| Chân 10 | RC0/T1OSO/T1CKI — PORTC bit 0 (Timer1 oscillator) |
| Chân 11 | RC1/T1OSI/CCP2 — PORTC bit 1 (Timer1 oscillator / CCP2) |
| Chân 12 | RC2/CCP1 — PORTC bit 2 (Capture/Compare/PWM1) |
| Chân 13 | RC3/SCK/SCL — PORTC bit 3 (SPI clock / I2C clock) |
| Chân 14 | RC4/SDI/SDA — PORTC bit 4 (SPI data in / I2C data) |
| Chân 15 | RC5/SDO — PORTC bit 5 (SPI data out) |
| Chân 16 | RC6/TX/CK — PORTC bit 6 (USART TX / clock) |
| Chân 17 | RC7/RX/DT — PORTC bit 7 (USART RX / data) |
| Chân 18 | GND — Ground |
| Chân 19 | VDD — Positive supply voltage |
| Chân 20 | RB0/INT — PORTB bit 0 (external interrupt) |
| Chân 21 | RB1 — PORTB bit 1 (digital I/O) |
| Chân 22 | RB2 — PORTB bit 2 (digital I/O) |
| Chân 23 | RB3/PGM — PORTB bit 3 (digital I/O / LVP program) |
| Chân 24 | RB4 — PORTB bit 4 (digital I/O) |
| Chân 25 | RB5 — PORTB bit 5 (digital I/O) |
| Chân 26 | RB6/PGC — PORTB bit 6 (digital I/O / ICSP clock) |
| Chân 27 | RB7/PGD — PORTB bit 7 (digital I/O / ICSP data) |
| Chân 28 | RD0/PSP0 — PORTD bit 0 (Parallel Slave Port) |
| Chân 29 | RD1/PSP1 — PORTD bit 1 (Parallel Slave Port) |
| Chân 30 | RD2/PSP2 — PORTD bit 2 (Parallel Slave Port) |
| Chân 31 | RD3/PSP3 — PORTD bit 3 (Parallel Slave Port) |
| Chân 32 | RD4/PSP4 — PORTD bit 4 (Parallel Slave Port) |
| Chân 33 | RD5/PSP5 — PORTD bit 5 (Parallel Slave Port) |
| Chân 34 | RD6/PSP6 — PORTD bit 6 (Parallel Slave Port) |
| Chân 35 | RD7/PSP7 — PORTD bit 7 (Parallel Slave Port) |
| Chân 36 | RE0/RD — PORTE bit 0 (Parallel Slave Port read) |
| Chân 37 | RE1/WR — PORTE bit 1 (Parallel Slave Port write) |
| Chân 38 | RE2/CS — PORTE bit 2 (Parallel Slave Port chip select) |
| Chân 39 | VSS — Ground reference |
| Chân 40 | VDD — Positive supply voltage |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC16C65B-20/PQ phù hợp cho 6 Áp dụngs: Industrial Control Panels, HVAC Fan and Damper Controllers, Vending Machine Logic Boards, Security Alarm Keypads, Automotive Instrument Cluster Logic, Consumer Appliance Interface Boards.
Industrial Control Panels
The PIC16C65B-20/PQ fits industrial control panels because its 33 digital I/O pins drive multiplexed 7-segment displays, matrix keypads, relay drivers, and opto-isolated inputs without external logic. The 20 MHz clock and 200 ns instruction cycle deliver deterministic scan loops for button debouncing and indicator refresh, while the USART links to a host PLC or HMI. Brown-out reset and watchdog timer ensure recovery from 24V industrial supply transients, and the wide 2.5-5.5V supply tolerance survives noisy backplane rails. With 7KB of OTP program memory the firmware can hold large state machines plus diagnostic tables in volume-deployed panel controllers.
Được đề xuất
HVAC Fan and Damper Controllers
The PIC16C65B-20/PQ suits HVAC fan and damper controllers thanks to its three on-chip timers (TMR0/TMR1/TMR2) supporting PWM generation for triac-triggered fan speed control and servo damper positioning. The 8-bit RISC core computes PID loops in real time at 20 MHz, while 33 I/O lines interface with temperature sensors via SPI, mode switches, status LEDs, and the USART to a building automation network. Brown-out reset and watchdog prevent lockup during compressor inrush events, and the 0-70C commercial range covers indoor air-handler cabinets. OTP memory locks firmware permanently so OEM control algorithms cannot be reverse-engineered in the field.
Được đề xuất
Vending Machine Logic Boards
Vending machine logic boards use the PIC16C65B-20/PQ for multi-drop coin acceptor interfacing, bill validator polling via USART, and matrix keypad PIN entry. Its 33 I/O lines easily drive 16-relay dispense banks plus vend-status LEDs while the SSP supports SPI communication with EEPROM for transaction logging. The 200 ns instruction cycle ensures sub-millisecond coin pulse timing accuracy, critical for validators that expect strict pulse-width protocols. OTP memory prevents counterfeit firmware flashing in deployed vending fleets, and the 2.5-5.5V supply range tolerates the wide load-dump transients seen on 24V vending bus rails.
Được đề xuất
Security Alarm Keypads
Security alarm keypads deploy the PIC16C65B-20/PQ because its 33 I/O pins directly scan a 4x4 matrix keypad plus 16 status LEDs without external mux logic. The USART communicates with the main alarm panel while the SSP runs SPI to a secure EEPROM holding user codes. The PIC16C65B-20/PQ's 7KB OTP memory accommodates multi-zone entry-delay state machines and anti-tamper patterns, and the code-protection bit locks the firmware from probing. Brown-out reset survives backup-battery switchover, and the 20 MHz clock provides fast polling for entry/exit chime logic in commercial alarm panels.
Được đề xuất
Automotive Instrument Cluster Logic
Automotive instrument cluster logic uses the PIC16C65B-20/PQ for odometer/stepper motor gauge driving and CAN-bus-less body electronics (pre-CAN era vehicles and aftermarket gauges). The 33 I/O lines drive multiple air-core gauges, warning lamps, and trip-reset switches. Its 20 MHz instruction cycle handles gauge damping calculations and turn-signal blink logic in real time. The OTP memory prevents mileage fraud by permanently locking odometer values, while brown-out reset and watchdog recover from automotive load-dump events. Migration to PIC16F877-20/PQ provides flash updates for production calibration of newer clusters.
Được đề xuất
Consumer Appliance Interface Boards
Consumer appliance interface boards - washing machines, microwave ovens, dishwashers - integrate the PIC16C65B-20/PQ as the user-interface controller. Its 33 I/O lines drive multi-digit displays, capacitive touch button scanning, buzzer PWM, and rotary encoder inputs while the SSP interfaces with the main appliance control MCU. The 7KB OTP memory holds localized firmware for multiple SKUs without expensive mask-ROM NRE charges. Brown-out reset and watchdog survive mains brown-outs common in household power, and the 20 MHz speed supports real-time motor-control feedback loops. OTP locking prevents firmware cloning by aftermarket competitors.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C65B-20/PQ — 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 | PIC16C65B-04/PQ | PIC16C65B-20I/PQ | PIC16C74B-20/PQ | PIC16F877-20/PQ | PIC16F877A-20/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 8 KB Flash | 14 KB Flash |
| Max Clock Frequency | 20 MHz | 4 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| ADC | None | None | None | 8 ch x 8-bit | 8 ch x 10-bit | 8 ch x 10-bit |
| Operating Temperature | 0C to +70C | 0C to +70C | -40C to +85C | 0C to +70C | 0C to +70C | 0C to +70C |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Data EEPROM | None | None | None | None | 256 bytes | 256 bytes |
Bảo phân biệt quan trọng
- Drop-in flash migration path on same footprint (vsPIC16F877-20/PQ)
- Industrial temperature drop-in variant (vsPIC16C65B-20I/PQ)
- ADC-enabled drop-in alternative (vsPIC16C74B-20/PQ)
Ghi chú thiết kế
The PIC16C65B-20/PQ operates from 2.5 V to 5.5 V with typical 5V supply. For 24V industrial rails add an LM7805 or LM2937 LDO with 100 nF + 10 uF decoupling. The device draws ~5 mA active at 20 MHz/5V plus I/O sink current; place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD pin (pins 19 and 40). Bulk 10 uF tantalum on the main 5V rail handles inrush when relays switch. Estimated: total 5V supply budget should be sized at 2x the typical operating current for transient headroom.
Lay out the 44-MQFP package on a 10x10 mm land pattern with 0.8 mm pitch; expose a continuous ground pour under the die attach pad area to improve thermal dissipation and EMI. Route the 20 MHz crystal traces (OSC1/OSC2, pins 8-9) within 5 mm of the IC, guard them with a grounded trace, and keep them short and symmetric to avoid parasitic capacitance. Place the MCLR pull-up (10 kohm) close to pin 1 and add a 100 nF cap on MCLR for noise immunity in electrically noisy environments.
Three pitfalls to avoid when designing with the PIC16C65B-20/PQ: (1) OTP memory cannot be reprogrammed - any firmware bug requires a new device, so always prototype with PIC16F877-20/PQ first; (2) the part lacks ADC - if you need analog sensing choose PIC16C74B-20/PQ as a drop-in upgrade; (3) commercial temperature grade limits deployment to 0-70C - for outdoor/automotive select the PIC16C65B-20I/PQ industrial variant. Brown-out reset must be enabled in CONFIG fuses for reliable operation across 24V industrial supply rails.
Thông tin tuân thủ
RoHS/lead-free status for PQ (MQFP) variant not explicitly confirmed in verified data - [DATA_NEEDED] marker used. PIC16C65B family predates widespread RoHS migration; many PQ variants are Pb-bearing. Verify with Microchip product page before RoHS-critical deployments.
