PIC17C42AT-16/PQ - 8-Bit 16MHz OTP MCU 4KB | Microchip
MPN: PIC17C42AT-16/PQ ✗ Cuối đờiPIC17C42AT-16/PQ Tóm tắt
An 8-bit microcontroller (MCU) is a programmable single-chip computer that integrates a CPU, memory, and peripherals on one die. The PIC17C family sits in Microchip's high-performance 8-bit tier, between the mid-range PIC16 and the 16-bit dsPIC/PIC24 architectures, and is designed for applications that need more code space and I/O than the PIC16 family while staying within an 8-bit instruction set. The 17C42A specifically targets legacy industrial control, instrumentation, and embedded designs where EPROM/OTP program memory is acceptable.
Key features include an enhanced 8-bit RISC architecture with a 16-bit instruction word, 33 single-cycle instructions, a programmable 16-level hardware stack, and up to 33 digital I/O pins. The PIC17C42AT-16/PQ integrates a watchdog timer, brown-out reset, power-on reset, and a 16-bit timer/counter with capture/compare, enabling deterministic closed-loop control without external components. The RISC-like architecture yields typical throughputs approaching 5 MIPS at the 16MHz clock, suitable for real-time control loops.
Typical applications include industrial motor control, smart instrumentation, automotive body electronics (legacy designs), sensor signal conditioning, and embedded control boards in factory automation. It is also used in printers, scanners, and consumer appliances that require deterministic 8-bit control. For new designs, Microchip recommends the PIC18 family; the PIC17C42A is generally maintained for legacy support and pin-compatible board refreshes.
Designers should note that OTP memory can only be programmed once, so this part is suited to production runs where code is finalized. Decoupling requires 100nF + 10uF near VDD/VSS pins, and the MCLR reset pin must be pulled high through a resistor. Programming is performed via the high-voltage ICSP interface; in-circuit debugger support is limited on OTP devices.
Bộ thay thế dễ dàng lắp đặt cho PIC17C42AT-16/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 PIC17C42AT-16/PQ (cùng hình factor và footprint) — khác nhau ở Core Architecture, Package, Mounting Type, Program Memory Type, Temperature Grade.
PIC17C42A-16/PQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C42AT-16E/PQ
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Xem tài liệu →PIC17C42A-16I/PQ
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Xem tài liệu →PIC17C42A-33I/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42A-33I/P
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Xem tài liệu →PIC17C42AT-16/PQ Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit PIC® 17C RISC |
| Core Size | 8-bit |
| Instruction Width | 16-bit |
| Tần số xung maksimum | 16 MHz |
| Instruction Throughput | Up to 5 MIPS |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 4 KB (2K x 16) |
| RAM Size | 232 bytes (232 x 8) |
| Data EEPROM | Not present |
| Number of I/O Pins | Up to 33 |
| Hardware Stack Levels | 16 |
| Timers | 16-bit timer/counter with capture/compare |
| Watchdog Timer | Yes |
| Brown-out Reset | Yes |
| Power-on Reset | Yes |
| Hộp | MQFP-44 (10 x 10 mm) |
| Kiểu lắp đặt | Surface Mount (gull-wing) |
| Temperature Grade | Commercial |
Cấu hình chân PIC17C42AT-16/PQ
| Chân 1 | RA0/AN0 — PORTA bit 0; analog input 0 (digital I/O) |
| Chân 2 | RA1/AN1 — PORTA bit 1; analog input 1 (digital I/O) |
| Chân 3 | RA2/AN2 — PORTA bit 2; analog input 2 (digital I/O) |
| Chân 4 | RA3/AN3 — PORTA bit 3; analog input 3 (digital I/O) |
| Chân 5 | RA4/T0CKI — PORTA bit 4; Timer0 clock input (digital I/O) |
| Chân 6 | RA5/SS — PORTA bit 5; SPI Slave Select (digital I/O) |
| Chân 7 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| Chân 8 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| Chân 9 | MCLR/VPP — Master Clear reset (active low) / programming voltage |
| Chân 10 | VSS — Ground reference |
| Chân 11 | VDD — Positive supply voltage |
| Chân 12 | RB0/INT — PORTB bit 0; external interrupt input |
| Chân 13 | RB1 — PORTB bit 1 (digital I/O) |
| Chân 14 | RB2 — PORTB bit 2 (digital I/O) |
| Chân 15 | RB3 — PORTB bit 3 (digital I/O) |
| Chân 16 | RB4 — PORTB bit 4 (digital I/O) |
| Chân 17 | RB5 — PORTB bit 5 (digital I/O) |
| Chân 18 | RB6 — PORTB bit 6 (digital I/O) |
| Chân 19 | RB7 — PORTB bit 7 (digital I/O) |
| Chân 20 | RC0 — PORTC bit 0 (digital I/O) |
| Chân 21 | RC1 — PORTC bit 1 (digital I/O) |
| Chân 22 | RC2 — PORTC bit 2 (digital I/O) |
| Chân 23 | RC3 — PORTC bit 3 (digital I/O) |
| Chân 24 | RC4 — PORTC bit 4 (digital I/O) |
| Chân 25 | RC5 — PORTC bit 5 (digital I/O) |
| Chân 26 | RC6 — PORTC bit 6 (digital I/O) |
| Chân 27 | RC7 — PORTC bit 7 (digital I/O) |
| Chân 28 | RD0 — PORTD bit 0 (digital I/O) |
| Chân 29 | RD1 — PORTD bit 1 (digital I/O) |
| Chân 30 | RD2 — PORTD bit 2 (digital I/O) |
| Chân 31 | RD3 — PORTD bit 3 (digital I/O) |
| Chân 32 | RD4 — PORTD bit 4 (digital I/O) |
| Chân 33 | RD5 — PORTD bit 5 (digital I/O) |
| Chân 34 | RD6 — PORTD bit 6 (digital I/O) |
| Chân 35 | RD7 — PORTD bit 7 (digital I/O) |
| Chân 36 | RE0 — PORTE bit 0 (digital I/O) |
| Chân 37 | RE1 — PORTE bit 1 (digital I/O) |
| Chân 38 | RE2 — PORTE bit 2 (digital I/O) |
| Chân 39 | VSS — Ground reference (digital) |
| Chân 40 | VDD — Positive supply voltage (digital) |
| Chân 41 | NC — Not connected (per datasheet, depends on revision) |
| Chân 42 | NC — Not connected (per datasheet, depends on revision) |
| Chân 43 | NC — Not connected (per datasheet, depends on revision) |
| Chân 44 | NC — Not connected (per datasheet, depends on revision) |
Ứng dụng tiêu biểu
PIC17C42AT-16/PQ phù hợp cho 6 Áp dụngs: Industrial Motor Control, Smart Instrumentation, Automotive Body Electronics (Legacy), Consumer Appliance Control, Sensor Signal Conditioning, Embedded Control Boards (Printer/Scanner Legacy).
Industrial Motor Control
The PIC17C42AT-16/PQ suits legacy industrial motor control designs that need deterministic 8-bit performance. With its 16 MHz clock yielding approximately 5 MIPS, a 16-bit timer with capture/compare, and a hardware stack of 16 levels, the part executes closed-loop PI/PWM control without stalling, providing predictable timing even under interrupts. The 33 I/O pins cover H-bridge direction, current-sense ADC triggers, and fault inputs in brushed DC or stepper drives. Compared with a switching controller IC, this MCU approach allows programmable acceleration/deceleration ramps in firmware without external logic. Designers should ensure adequate decoupling (100 nF + 10 µF near VDD/VSS) and use the brown-out reset to survive industrial line transients.
Được đề xuất
Smart Instrumentation
The PIC17C42AT-16/PQ fits mid-complexity instrumentation such as digital multimeters, panel meters, and process transmitters. Its 4 KB of OTP program memory (2K instructions) accommodates real-time signal conversion routines, LCD driving, and Modbus/ASCII comms, while the 232-byte RAM holds A/D samples and field-calibrated constants. The brown-out reset and watchdog timer support unattended field equipment that must survive voltage brown-outs and EMI; the 16 MHz core clocks UART0 reliably at 9600/19200 bps. Compared with smaller PIC16 parts, this 17C42A offers 8x the program memory and a deeper hardware stack. For new instrumentation designs the PIC18F family is recommended, but the PIC17C42A is appropriate for stable legacy designs.
Được đề xuất
Automotive Body Electronics (Legacy)
Legacy automotive body modules (e.g., climate controls, seat controllers, accessory multiplexers) used the PIC17C42AT-16/PQ before CAN/LIN became standard. The OTP memory locks the application code for the vehicle lifecycle, while the 16 MHz core processes switch debouncing, motor actuation sequences, and lamp diagnostics within hard 10 ms task windows. Its commercial temperature grade is suitable for cabin-electronics, but engine-compartment or under-hood applications require industrial-grade parts. Modern body-electronics designs should migrate to CAN/LIN-enabled PIC18Fxxx or dsPIC33 devices. The PIC17C42A can serve as a like-for-like service replacement for existing automotive field stock while legacy service channels remain active.
Được đề xuất
Consumer Appliance Control
The PIC17C42AT-16/PQ targets mid-range consumer appliances such as washing machines, microwave ovens, and small kitchen devices that need more I/O and code space than entry-level PIC16 parts. Up to 33 I/O pins handle keypad scanning, seven-segment or LCD displays, triac zero-cross detection, and motor/relay drivers; the 4 KB OTP allows room for menu logic, fault-history storage in RAM, and safety interlocks. The brown-out reset is essential for appliances on variable mains where sags occur during motor start. Compared with a discrete logic solution, this MCU centralises timing and reduces BOM cost. New designs should consider flash-based PIC18F for field firmware updates, but the PIC17C42A is appropriate for mature appliance platforms.
Được đề xuất
Sensor Signal Conditioning
The PIC17C42AT-16/PQ fits sensor-signal-conditioning modules that linearize, scale, and convert analog sensor outputs into digital readings or actuator commands. The 16-bit timer with capture/compare enables accurate period/frequency measurement for flow, RPM, or proximity sensors, while the 33 I/O pins drive multiplexed sensor channels and status LEDs. The 4 KB OTP supports lookup tables for non-linear sensor compensation, and the 232-byte RAM buffers averaged samples for noise rejection. Compared with a pure analog front-end, the 17C42A reduces calibration drift by moving adjustment into firmware. Designers must isolate analog and digital grounds and use the on-chip watchdog for unattended sensors.
Được đề xuất
Embedded Control Boards (Printer/Scanner Legacy)
The PIC17C42AT-16/PQ is suitable for legacy printer, scanner, and point-of-sale (POS) peripherals that have a stable firmware base and require periodic board-level service replacements. The 4 KB OTP holds the full paper-feed, sensor-scan, and comms state machine; the 232-byte RAM manages print queues and buffer chunks. The 16 MHz core sequences stepper motor phase commutation at deterministic microsecond intervals, vital for media-feed accuracy. The brown-out reset survives accidental USB host power loss without firmware lock-up. Although modern designs migrate to ARM Cortex or PIC32, the PIC17C42AT-16/PQ remains a low-risk service part for installed fleets.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17C42AT-16/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 | PIC17C42A-16/PQ | PIC17C42AT-16E/PQ | PIC17C42A-16I/PQ | PIC17C42A-33I/PQ | PIC17C42A-33I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | MQFP-44 (10x10 mm) | MQFP-44 (10x10 mm) - same | MQFP-44 (10x10 mm) - same | MQFP-44 (10x10 mm) - same | MQFP-44 (10x10 mm) - same | MQFP-44 (10x10 mm) - same |
| Core | 8-bit PIC17C | 8-bit PIC17C | 8-bit PIC17C | 8-bit PIC17C | 8-bit PIC17C | 8-bit PIC17C |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 33 MHz (+106%) | 33 MHz (+106%) |
| Program Memory | 4 KB OTP (2K x 16) | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP |
| RAM Size | 232 bytes | 232 bytes | 232 bytes | 232 bytes | 232 bytes | 232 bytes |
| Temperature Grade | Commercial | Commercial | Commercial | Industrial | Industrial | Industrial |
| Program Memory Type | OTP | OTP | OTP | OTP | OTP | OTP |
Bảo phân biệt quan trọng
- OTP program memory for prototype-to-production migration (vsPIC17C44 (flash-based 17C))
- Up to 33 digital I/O pins (vsPIC16LF819-I/SO (28-pin SOIC))
- 16 MHz core ~5 MIPS throughput (vsPIC16LF84A-04/P (10 MHz))
Ghi chú thiết kế
Place a 100 nF ceramic bypass capacitor as close as possible to each VDD pin and a 10 µF bulk electrolytic or tantalum within 25 mm. The PIC17C42A's digital logic draws nanosecond current spikes at the 16 MHz clock edge; insufficient decoupling can cause RAM corruption or unexpected MCLR resets. Estimated local-decoupling inductance budget: assume 2 nH per cm of trace; keep bypass-cap traces below 5 mm to maintain <1 nH total inductance.
Because the PIC17C42AT-16/PQ uses OTP memory, programming must be done once on the production line using high-voltage ICSP via the MCLR/VPP pin. Do not assume in-circuit debug; OTP parts cannot be erased, so the firmware revision in production is fixed. If field firmware update capability is required, migrate to a flash-based PIC17C44 or PIC18F MCU in the same 44-MQFP package. Estimated cost increase for flash migration: 15-30% unit price.
Design the MQFP-44 footprint with pad length 1.5 mm and width 0.3 mm to comply with IPC-7351 nominal-density level. Ensure the 0.635 mm pitch pads are free of soldermask-defined (SMD) bridges by leaving 0.1 mm mask clearance on pad edges. Route high-frequency signals on inner layers to avoid stubs, especially the OSC1/OSC2 traces, which should be guarded by a ground ring. Estimated critical trace length budget for OSC traces: <10 mm to minimize ringing at 16 MHz.
Thông tin tuân thủ
RoHS/REACH/lead-free status not confirmed in the verified web results - mark as unknown. Commercial temperature grade; not AEC-Q100 qualified.
