PIC17C42AT-16I/PQ - 8-Bit 16MHz OTP MCU, 4KB | Microchip
MPN: PIC17C42AT-16I/PQ ✗ Cuối đờiPIC17C42AT-16I/PQ Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/EPROM), working memory (RAM), and peripherals such as timers, I/O, and serial interfaces. The PIC17C family occupies the upper end of Microchip's classic 8-bit PIC line, bridging between the baseline PIC16 mid-range family and the higher-end PIC18 family. It uses a RISC-based Harvard architecture with separate program and data buses, which is the structural hypernym of all PIC microcontrollers, falling under the broader integrated circuit and semiconductor taxonomy.
Key features of the PIC17C42AT-16I/PQ include a 16 MIPS instruction throughput at 16 MHz, 8-bit data width, hardware multiply support via the ALU, a multi-source interrupt controller, and a dedicated USART peripheral. The OTP program memory allows one-time field programming, making this part suitable for mature, low-cost production runs after prototype validation is complete on a windowed (JW) variant.
Architecturally, the PIC17C42A employs a 16-bit instruction word with an 8-bit data path, which is why program memory is organized as 2K x 16. This wider instruction word gives the PIC17C family a richer addressing space (16-bit program counter) than its PIC16 predecessor while preserving code compatibility at the assembly level for many peripheral registers.
Typical applications include industrial control systems, motor control front-ends, embedded instrumentation, automotive body electronics (non-safety-critical), HVAC controllers, and consumer appliance control boards. The 33 I/O count is well-matched to systems that need to drive multiple relays, keypads, and indicator panels.
When designing with this part, ensure your firmware development is completed before ordering the OTP suffix because OTP memory cannot be erased and reprogrammed. For development cycles, use the PIC17C42A-16/JW (windowed CERDIP) variant that allows UV erasure and reuse of the same silicon.
This page synthesizes distributor stock and pricing data, drop-in same-package alternatives, and engineering design notes that go beyond what the manufacturer datasheet provides alone.
Bộ thay thế dễ dàng lắp đặt cho PIC17C42AT-16I/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-16I/PQ (cùng hình factor và footprint) — khác nhau ở Operating Temperature Range, Package, Mounting Type, RAM Size, Instruction Cycle.
PIC17C42A-16I/PQ
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Xem tài liệu →PIC17C42AT-16I/PT
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PIC17C42AT-16I/P
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PIC17C42AT-16I/L
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Xem tài liệu →PIC17C42A-33I/PQ
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Xem tài liệu →PIC17C42A-25E/P
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Xem tài liệu →PIC17C42AT-16I/PQ Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Family | PIC17C series |
| Bề rộng đường dữ liệu | 8 bit |
| Instruction Word Width | 16 bit |
| Tần số xung maksimum | 16 MHz |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 4 KB (2K x 16) |
| RAM Size | 232 B |
| I/O Pin Count | 33 |
| Communication Interfaces | UART/USART |
| Peripherals | POR (Power-on Reset), WDT |
| Hộp | 44-MQFP (10x10 mm) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
Cấu hình chân PIC17C42AT-16I/PQ
| Chân 1 | MCLR — Master Clear (Reset) input, active low |
| Chân 2 | RA0/AN0 — Port A bit 0 / analog input 0 |
| Chân 3 | RA1/AN1 — Port A bit 1 / analog input 1 |
| Chân 4 | RA2/AN2 — Port A bit 2 / analog input 2 |
| Chân 5 | RA3/AN3 — Port A bit 3 / analog input 3 |
| Chân 6 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| Chân 7 | RA5/SS — Port A bit 5 / SPI slave select |
| Chân 8 | OSC1 — Crystal oscillator input |
| Chân 9 | OSC2 — Crystal oscillator output |
| Chân 10 | Vss — Ground reference |
| Chân 11 | RC0 — Port C bit 0 |
| Chân 12 | RC1 — Port C bit 1 |
| Chân 13 | RC2 — Port C bit 2 |
| Chân 14 | RC3 — Port C bit 3 |
| Chân 15 | RC4 — Port C bit 4 |
| Chân 16 | RC5 — Port C bit 5 |
| Chân 17 | RC6 — Port C bit 6 |
| Chân 18 | RC7 — Port C bit 7 |
| Chân 19 | Vss — Ground reference |
| Chân 20 | Vdd — Positive supply voltage |
| Chân 21 | RB0/INT — Port B bit 0 / external interrupt |
| Chân 22 | RB1 — Port B bit 1 |
| Chân 23 | RB2 — Port B bit 2 |
| Chân 24 | RB3 — Port B bit 3 |
| Chân 25 | RB4 — Port B bit 4 |
| Chân 26 | RB5 — Port B bit 5 |
| Chân 27 | RB6 — Port B bit 6 |
| Chân 28 | RB7 — Port B bit 7 |
| Chân 29 | Vss — Ground reference |
| Chân 30 | Vdd — Positive supply voltage |
| Chân 31 | TX/CK — USART transmit / clock line |
| Chân 32 | RX/DT — USART receive / data line |
| Chân 33 | NC — Not connected (per datasheet) |
| Chân 34 | NC — Not connected (per datasheet) |
| Chân 35 | NC — Not connected (per datasheet) |
| Chân 36 | NC — Not connected (per datasheet) |
| Chân 37 | NC — Not connected (per datasheet) |
| Chân 38 | NC — Not connected (per datasheet) |
| Chân 39 | NC — Not connected (per datasheet) |
| Chân 40 | NC — Not connected (per datasheet) |
| 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
PIC17C42AT-16I/PQ phù hợp cho 6 Áp dụngs: Industrial Control Systems, Motor Control Front-Ends, HVAC Control Boards, Embedded Instrumentation, Consumer Appliance Control, Automotive Body Electronics (Non-Safety).
Industrial Control Systems
The PIC17C42AT-16I/PQ fits industrial control applications because of its 16 MHz PIC17C RISC core delivering 16 MIPS throughput, 33 GPIO pins sufficient to drive multi-relay panels, and industrial -40C to +85C temperature grade. Its 4KB OTP program memory holds typical ladder-logic replacement firmware plus PID control loops, while 232 bytes of RAM covers status buffers and a UART command interface. The hardware USART interfaces directly to RS-232/RS-485 transceivers for SCADA link-up, eliminating the need for an external serial chip. Industrial PCB designers value the MQFP-44 (10x10 mm) surface-mount footprint for compact IP65-rated enclosures.
Được đề xuất
Motor Control Front-Ends
For motor control front-ends the PIC17C42AT-16I/PQ is well suited because its 16 MHz Harvard core executes BLDC commutation tables with deterministic 4-cycle instruction timing and its 33 GPIO pins source gate-driver signals for 3-phase inverter bridges. The 232-byte RAM accommodates current-sense sample buffers and 16-bit PWM duty registers, while the hardware USART serves as the command channel for a host PLC or HMI panel. The MQFP-44 package withstands industrial vibration when soldered to a 4-layer PCB with adequate thermal relief. With the 16 MHz instruction budget engineers can implement sensorless back-EMF commutation on small BLDC fans and pumps without resorting to a DSP.
Được đề xuất
HVAC Control Boards
The PIC17C42AT-16I/PQ drives HVAC control boards where its industrial -40C to +85C temperature range handles rooftop unit ambient extremes and its 33 I/O pins connect to thermostats, damper actuators, and multi-stage compressor relays. The 4KB OTP program memory stores scheduling tables and EEPROM-emulated setpoints, while 232 bytes of RAM is sufficient for the control loop state machine and a Modbus RTU slave over the hardware USART. The MQFP-44 footprint enables single-sided PCB assembly for low-cost HVAC retrofits, and Microchip's long-term PIC17C family support ensures firmware compatibility across board revisions.
Được đề xuất
Embedded Instrumentation
In embedded instrumentation such as portable multimeters and panel meters the PIC17C42AT-16I/PQ serves as the measurement-and-display controller thanks to its 16 MIPS throughput, which executes RMS calculation and autoranging algorithms in real time, plus its 33 GPIO pins that drive segmented LCD multiplexers or LED bargraphs. The 4KB OTP holds calibration tables and menu logic, while 232 bytes of RAM buffers ADC samples between display updates. The industrial temperature grade supports lab and field environments. The USART exports logged data to a host PC running terminal software, eliminating the need for a dedicated USB-to-serial bridge on the meter itself.
Được đề xuất
Consumer Appliance Control
The PIC17C42AT-16I/PQ controls consumer appliances such as washing machines, dishwashers, and microwave ovens where its 8-bit PIC17C core, 4 KB OTP, and 33 I/O pins provide ample headroom for keypad scanning, seven-segment display refresh, and triac-driven load switching. The industrial temperature grade is overkill for indoor appliances but useful for oven-front control boards that sit near heat sources. The 16 MHz throughput executes fuzzy-logic wash-cycle algorithms in real time, and the hardware USART interfaces with an external Bluetooth module for smart-appliance retrofits.
Được đề xuất
Automotive Body Electronics (Non-Safety)
The PIC17C42AT-16I/PQ targets automotive body-electronics modules such as seat controllers, mirror adjusters, and lighting timers, where its industrial temperature grade covers cabin environments and its 33 GPIO pins drive multi-channel LED drivers and motor bridges. The 4KB OTP stores lighting-sequence and seat-memory profiles, while the hardware USART interfaces with the body-control network gateway. For non-safety automotive modules the PIC17C42A is sufficient, but safety-critical applications like airbag controllers must migrate to AEC-Q100-qualified parts. The MQFP-44 footprint simplifies thermal management on metal-chassis modules.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17C42AT-16I/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-16I/PQ | PIC17C42AT-16I/PT | PIC17C42AT-16I/P | PIC17C42A-33I/PQ |
|---|---|---|---|---|---|
| Package | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) - same | 44-TQFP - very close | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 33 MHz |
| Program Memory | 4 KB (2K x 16) OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP | 4 KB OTP |
| RAM | 232 B | 232 B | 232 B | 232 B | 232 B |
| GPIO Pins | 33 | 33 | 33 | 33 | 33 |
| USART | Yes (hardware) | Yes | Yes | Yes | Yes |
| Temperature Grade | Industrial (-40C to +85C) | Industrial | Industrial | Industrial | Industrial |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND |
Bảo phân biệt quan trọng
- Higher 33 I/O count and 16 MIPS throughput vs PIC16 baseline (vsPIC16F877A)
- Tape-and-reel packaging ready for high-volume SMT assembly (vsPIC17C42A-16I/PQ (tray))
- Industrial -40C to +85C temperature grade (vsPIC17C42AT-16/PQ (commercial 0C to +70C))
Ghi chú thiết kế
The 'T' suffix denotes OTP (one-time programmable) memory. Once programmed, the PIC17C42AT-16I/PQ cannot be erased or re-programmed. Engineers must validate firmware on a windowed ceramic (JW) variant such as PIC17C42A-16/JW before committing to OTP for production. Failing to do so is the most common cause of field scrap on PIC17C designs.
The 44-MQFP package has 0.8 mm lead pitch and 10x10 mm body, requiring fine-pitch PCB assembly. Use ENIG surface finish on the PCB pads and a 4-layer stackup with a solid ground plane directly under the IC to control EMI on the USART lines. Place the decoupling capacitors (100 nF ceramic plus 10 uF tantalum) within 5 mm of the Vdd/Vss pin pairs (pins 20, 30 for Vdd; pins 10, 19, 29 for Vss).
PIC17C42A Vdd operating range is 4.5V to 6.0V (typical 5V), exceeding the PIC16LF range. Power-rail design must include a 5V LDO or switching regulator rated for the MCU's 25 mA active current plus I/O sink current. Reset circuit: connect MCLR (pin 1) to Vdd through a 10 kohm pull-up and to ground through a 100 nF capacitor for a 1 ms power-on reset delay, per the Microchip PIC17C datasheet.
Thông tin tuân thủ
PIC17C42AT-16I/PQ is NRND by Microchip. RoHS/lead-free status not stated explicitly in the verified web data and should be confirmed with Microchip before use in RoHS-restricted designs. Not AEC-Q100 qualified.
