PIC16C73B-20/SS - 20MHz 8-bit OTP MCU, 28-SSOP | Microchip
MPN: PIC16C73B-20/SS ✓ Hoạt độngPIC16C73B-20/SS Tóm tắt
A mid-range PIC16C family microcontroller sits within the broader 8-bit MCU taxonomy: PIC16C mid-range -> PIC16CXX family -> PIC16 8-bit core -> Microchip PIC microcontroller -> embedded controller. The PIC16C7x mid-range architecture introduced in this era extended the original PIC16C5x baseline by adding on-chip peripherals (ADC, PWM, USART, I2C/SPI) while preserving upward code compatibility with the PIC12Cxxx and PIC16C5x cores. Mid-range PIC devices are valued for predictable interrupt latency, deterministic instruction timing, and a 35-instruction RISC instruction set that engineers can master in days rather than weeks.
Key features of the PIC16C73B include 192 bytes of on-chip RAM, hardware USART, an 8-bit timer/counter with optional prescaler, a watchdog timer with on-chip RC oscillator, in-circuit serial programming capability via two pins, and brown-out reset for reliable power-on behavior. The OTP memory variant (-20/SS) is windowless and suited for production-volume applications; the UV-erasable CERDIP-28 (-JW) variant is intended for prototype development and firmware iteration. Operating voltage spans 4.0 V to 5.5 V with commercial and industrial temperature grades available.
Typical applications span consumer appliance control panels, small-format industrial sensor interfaces, low-bandwidth motor control using the on-chip CCP/PWM modules, smart-card readers, UPS monitoring, and HVAC damper/valve actuators. The 5-channel 8-bit ADC combined with two PWM channels is particularly well-matched to closed-loop fan control, LED brightness regulation, and brushed-DC motor velocity control, where a single chip handles sensing and actuation without external glue logic.
When designing with the PIC16C73B-20/SS, observe the maximum clock frequency (20 MHz) derating across temperature and voltage - operation at the upper Vdd limit of 5.5 V is required to maintain rated timing. The SSP peripheral needs accurate pull-up resistor selection on I2C lines (typically 4.7 kohm at 400 kHz), and unused I/O should be set as outputs low to minimize shoot-through current during sleep. Because the /SS package is OTP, firmware must be fully validated before committing to programming; use the CERDIP -JW variant for development.
This page synthesizes distributor pricing, drop-in same-package alternatives from the Microchip PIC16C family, and practical design notes not consolidated in the manufacturer datasheet - giving procurement and firmware engineers a single decision-ready view of the PIC16C73B-20/SS.
Bộ thay thế dễ dàng lắp đặt cho PIC16C73B-20/SS — 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 PIC16C73B-20/SS (cùng hình factor và footprint) — khác nhau ở Timers, Package, Operating Temperature, ADC, Program Memory Size.
PIC16F73-I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C73B-20I/SS
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16C73B-20E/SS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C73B-04/SS
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16C73A-20I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C73B-20/SS Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16C mid-range 8-bit RISC |
| Program Memory | 7 KB (4K x 14) OTP |
| RAM | 192 bytes |
| Data EEPROM | Not present (OTP family) |
| Tần số xung maksimum | 20 MHz |
| Instruction Cycle Time | 200 ns |
| Supply Voltage (Vdd) | 4.0 V to 5.5 V |
| I/O Pins | 22 |
| ADC | 5 channels x 8-bit |
| Timers | 3 (Timer0, Timer1, Timer2) |
| CCP/PWM Modules | 2 |
| Serial Interfaces | 1x SSP (SPI or I2C), 1x USART |
| Hộp | 28-SSOP (5.30 mm width, 0.65 mm pitch) |
| Nhiệt độ hoạt động | 0C to +70C (commercial) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân PIC16C73B-20/SS
| Chân 1 | MCLR/Vpp — Master Clear (reset) input / Programming voltage |
| Chân 2 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| Chân 4 | RA2/AN2 — PORTA bit 2 / Analog input channel 2 |
| Chân 5 | RA3/AN3/Vref — PORTA bit 3 / Analog input channel 3 / ADC reference |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — PORTA bit 5 / Analog input channel 4 / SPI Slave Select |
| Chân 8 | Vss — Ground reference |
| Chân 9 | OSC1/CLKIN — Oscillator input / External clock input |
| Chân 10 | OSC2/CLKOUT — Oscillator output / Clock output |
| Chân 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Chân 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 I/O |
| Chân 13 | RC2/CCP1 — PORTC bit 2 / CCP1 I/O (PWM) |
| Chân 14 | RC3/SCK/SCL — PORTC bit 3 / SSP clock (SPI SCK / I2C SCL) |
| Chân 15 | RC4/SDI/SDA — PORTC bit 4 / SSP data in (SPI SDI / I2C SDA) |
| Chân 16 | RC5/SDO — PORTC bit 5 / SSP data out (SPI SDO) |
| Chân 17 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Chân 18 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Chân 19 | Vss — Ground reference |
| Chân 20 | Vdd — Positive supply (4.0-5.5 V) |
| Chân 21 | RB0/INT — PORTB bit 0 / External interrupt |
| Chân 22 | RB1 — PORTB bit 1 |
| Chân 23 | RB2 — PORTB bit 2 |
| Chân 24 | RB3 — PORTB bit 3 |
| Chân 25 | RB4 — PORTB bit 4 |
| Chân 26 | RB5 — PORTB bit 5 |
| Chân 27 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 28 | RB7/PGD — PORTB bit 7 / ICSP data |
Ứng dụng tiêu biểu
PIC16C73B-20/SS phù hợp cho 6 Áp dụngs: Consumer Appliance Control Panels, Industrial Sensor Interfaces, Brushed DC Motor Velocity Control, Smart Card and RFID Reader Front-Ends, UPS and Battery Monitor Front-End, HVAC Damper and Valve Actuators.
Consumer Appliance Control Panels
The PIC16C73B-20/SS drives user-interface control panels in white goods and small appliances, where its 5x 8-bit ADC reads keypad matrixes and front-panel potentiometers while the on-chip CCP/PWM modules modulate indicator LED brightness or buzzer tones. With 22 I/O and the integrated USART, the chip directly interfaces to character LCDs, seven-segment displays, and serial-managed peripheral boards, replacing discrete logic that previously required a dedicated display controller. The 20 MHz clock and 200 ns instruction cycle handle debounced button scanning and menu state machines in real time, and the SSOP-28 footprint is small enough for front-panel PCB real estate. At a unit price below USD 5 in volume, this is one of the lowest-cost MCU solutions for cost-sensitive consumer electronics production.
Được đề xuất
Industrial Sensor Interfaces
The PIC16C73B-20/SS is well suited to industrial sensor signal conditioning and protocol conversion tasks such as 4-20 mA loop monitoring, thermocouple cold-junction compensation, and Modbus-over-RS485 gateway nodes. The 5 channels of 8-bit ADC read multiple analog sensors simultaneously, and the USART plus SSP peripherals implement RS-485 or I2C/SPI sensor networks on the same chip. Brown-out reset and the watchdog timer with on-chip RC oscillator deliver industrial-grade reliability against supply glitches and firmware lockups. The 4.0-5.5 V supply range accepts 24 V-bus-derived rails after local regulation. Engineers use the PIC16C73B-20/SS in PLC digital-input cards, process-control valve actuators, and HVAC damper motor controllers where 8-bit resolution is sufficient.
Được đề xuất
Brushed DC Motor Velocity Control
Closed-loop brushed-DC motor velocity control is a natural application for the PIC16C73B-20/SS, leveraging the dual CCP/PWM channels to drive an H-bridge MOSFET driver and the 5x 8-bit ADC to read tachogenerator or back-EMF feedback. The 20 MIPS core executes PI control loops in well under 1 ms, well within the bandwidth requirements of small fans, pumps, and conveyor drives. Timer1 with the optional external crystal input provides a stable period reference for tachometer pulse-width measurement. The on-chip USART enables host-side tuning of PID coefficients over RS-232 or RS-485. Designers building conveyor speed controllers, vending-machine dispense motors, and HVAC fan-speed regulators commonly standardize on this chip.
Được đề xuất
Smart Card and RFID Reader Front-Ends
The PIC16C73B-20/SS forms the controller front-end for low-cost smart-card and 125 kHz RFID reader modules, where its USART and SSP peripherals manage the half-duplex ISO 7816 or ISO 14443 transceive protocol. The 5x ADC channels monitor the RF envelope-detector output and supply-voltage quality for tamper and brown-out detection. The 20 MHz instruction cycle meets the 3.58 MHz smart-card clock-generation requirement with margin to spare for ATR (Answer-To-Reset) parsing. Designers standardize on this part for time-attendance terminals, door-access readers, and POS terminals where 7 KB of OTP code space is sufficient for command set handling.
Được đề xuất
UPS and Battery Monitor Front-End
Uninterruptible Power Supply (UPS) battery monitor and charger front-end designs leverage the PIC16C73B-20/SS 5x ADC channels to measure battery voltage, charge current, ambient temperature, and load current simultaneously, while the CCP/PWM modules drive a synchronous-rectifier MOSFET gate driver or a flyback primary switch. The USART provides status reporting to a host BMS (Battery Management System). With 7 KB OTP code space, the firmware handles cell balancing, SOC (State of Charge) estimation, and fault logging for sealed lead-acid or Li-ion packs. The wide 4.0-5.5 V supply accepts operation directly from the battery rail in many configurations, with the watchdog timer providing fail-safe recovery from brown-outs.
Được đề xuất
HVAC Damper and Valve Actuators
HVAC damper and valve actuator controllers use the PIC16C73B-20/SS as a single-chip solution, with the 5x ADC reading temperature sensors, humidity probes, and potentiometer position feedback, while the dual PWM channels drive a brushless DC or stepper motor driver. The USART connects to a building-automation controller over RS-485 using Modbus RTU. Brown-out reset and the watchdog timer with on-chip RC oscillator provide reliability against mains-side disturbances. The 28-SSOP package fits easily inside the compact actuator housing, and the OTP memory locks down the production firmware to prevent field tampering. Engineers commonly use this chip in 24 VAC-powered damper actuators and thermostatic radiator valves.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C73B-20/SS — 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 | PIC16F73-I/SS | PIC16C73B-20I/SS | PIC16C73B-20E/SS |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP (5.30 mm) | 28-SSOP (5.30 mm) - same | 28-SSOP (5.30 mm) - same | 28-SSOP (5.30 mm) - same |
| Program Memory | 7 KB OTP (4K x 14) | 4 KB Flash | 7 KB OTP | 7 KB OTP |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| ADC Channels x Resolution | 5 x 8-bit | 5 x 8-bit | 5 x 8-bit | 5 x 8-bit |
| Operating Temperature | 0C to +70C (commercial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +125C (extended) |
| USART | Yes | Yes | Yes | Yes |
| I/O Pins | 22 | 22 | 22 | 22 |
Bảo phân biệt quan trọng
- Pin-compatible Flash alternative from same manufacturer (vsPIC16F73-I/SS)
- Extended temperature grades available in same footprint (vsPIC16C73B-20I/SS and PIC16C73B-20E/SS)
- 5x 8-bit ADC + 2x PWM + USART + SSP in single chip (vsPIC16C72-20/SS)
Ghi chú thiết kế
Estimated: at 20 MHz clock, Vdd = 5.0 V, and all peripherals active, the PIC16C73B-20/SS draws approximately 15-20 mA per typical Microchip datasheet figures. Add a 100 nF ceramic decoupling capacitor directly across Vdd/Vss (pin 20 and pin 19) within 5 mm of the package, plus a 10 uF bulk tantalum or aluminum polymer capacitor for Vdd transients during ADC conversions. Use a separate analog Vdd/Vss pair (AVdd/AVss) if the ADC is enabled for precision measurements - even though the PIC16C73B-20/SS shares Vdd/Vss with the digital supply, isolating the analog supply with a ferrite and 10 uF + 100 nF filter reduces ADC noise pickup from the digital switching currents.
Keep the 28-SSOP trace length from OSC1/OSC2 (pins 9/10) to the crystal or resonator under 10 mm to avoid excess parasitic capacitance that could detune the oscillator or prevent startup. Provide a solid ground pour under and around the device, and route the MCLR line (pin 1) separately from high-current switching traces. For ICSP programming access, reserve a 4-pin header footprint (or test pads) connected to MCLR, Vdd, Vss, RB6/PGC, and RB7/PGD so a PICkit or ICD can be attached without rework.
The PIC16C73B-20/SS uses OTP memory - once programmed, it cannot be erased or rewritten. Use the CERDIP PIC16C73B-20/JW variant with a quartz window for development, and only move to OTP /SS or /SO production packages after firmware is fully validated. Also note that the 8-bit ADC requires a minimum acquisition time of approximately 20 us per the datasheet - read the GO/DONE bit before changing channels, and insert the proper Tacq delay or use the built-in ADC acquisition timer to avoid undersampled readings on fast-scanning multiplexed channels.
When using the USART at 115.2 kbaud or higher with long PCB traces, add a 100 ohm series resistor at the TX pin to dampen reflections, and ensure the RX line has a clean logic-level signal with appropriate slew rate. For I2C operation above 100 kHz, use 4.7 kohm pull-up resistors on SDA and SCL (not 10 kohm) to meet the rise-time specification. If the SSP module is shared with SPI peripherals, ensure the SS (Slave Select) pin is properly driven low by the master during SPI transactions or unexpected SDA/SCK contention may occur.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - use PIC16C73B-20I/SS or PIC16F73-I/SS for automotive-grade applications. Lead-free packaging confirmed by /SS surface-mount suffix.
