PIC16F870-I/SS - 8-Bit 20MHz 3.5KB Flash MCU 28-SSOP | Microchip
MPN: PIC16F870-I/SS ✓ فعالPIC16F870-I/SS نمای کلی
A mid-range PIC microcontroller such as the PIC16F870 belongs to a class of 8-bit Harvard-architecture microcontrollers that separates program and data memory buses, allowing simultaneous fetch and execute in a single instruction cycle. The PIC16F876A family tree sits between baseline PIC10/12 devices and high-performance PIC18 parts; it is targeted at cost-sensitive embedded control with on-chip peripherals and self-programming support for in-application firmware updates. The 28-SSOP (Shrink Small Outline Package) provides a compact 0.65 mm pitch footprint while maintaining 22 digital I/O lines.
Key features include 22 I/O pins, a programmable code-protection scheme, nanoWatt power management for low-power sleep operation, an on-chip In-Circuit Debugger (ICD), and 64 bytes of EEPROM rated for 100K erase/write cycles. The USART supports RS-232 and RS-485 comms, while the MSSP module handles both SPI and I2C master/slave protocols. Five 10-bit ADC channels enable direct sensor interfacing without external analog components.
The device operates from 4.0V to 5.5V (PIC16F870) or 2.0V to 5.5V (PIC16LF870 variant). Built around Microchip's enhanced mid-range core, the PIC16F870 supports 14-bit instruction word, hardware multiplier, and 8-level hardware stack. Self-programming enables bootloader-style firmware updates via any of the serial interfaces.
Typical applications include industrial sensor monitoring, HVAC fan controllers, small appliance control, automotive body electronics, low-end instrumentation, and battery-charging regulators. The 28-pin SSOP package makes it suitable for space-constrained PCB designs where 40-pin DIP variants (PIC16F871) are too large.
When designing with the PIC16F870-I/SS, ensure the system clock configuration (HS, XT, RC, or internal) matches the timing requirements of the application. Decoupling capacitors (0.1 uF and 10 uF) must be placed close to VDD/VSS pins, and unused I/O should be configured as outputs low to minimize current draw.
This page synthesizes distributor pricing, SSOP-packaged drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet to accelerate your component selection and PCB layout decisions.
جایگزین‌های drop-in برای PIC16F870-I/SS — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای PIC16F870-I/SS (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Package, Timers, Core Architecture, Operating Temperature, ADC.
PIC16F870-E/SS
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16F870T-I/SS
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16LF870-I/SS
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16F870-I/SP
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16F876A-I/SS
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16F870-I/SS حداکثر مقادیر مجاز و مشخصات الکتریکی
| Core | PIC16 mid-range 8-bit RISC |
| Instruction Set | 35 instructions, 14-bit wide |
| Operating Frequency | DC to 20 MHz (200 ns instruction cycle) |
| Program Memory (Flash) | 3.5 KB (2K x 14 words) |
| Data RAM | 128 bytes |
| Data EEPROM | 64 bytes |
| I/O Pins | 22 |
| Timers | 2 x 8-bit, 1 x 16-bit |
| ADC | 10-bit, 5 channels |
| Serial Interfaces | USART (RS-232/RS-485), MSSP (SPI/I2C) |
| CCP Module | Capture/Compare/PWM, 1 module |
| Operating Voltage (PIC16F870) | 4.0 V to 5.5 V |
| Operating Temperature (Industrial -I) | -40 C to +85 C |
| بسته‌بندی | 28-pin SSOP (5.30 mm body, 0.65 mm pitch) |
| On-chip Debug | ICD (In-Circuit Debugger) |
| Self-Programming | Yes (flash program memory) |
| Hardware Stack | 8 levels |
| وضعیت RoHS | Compliant |
پیکربندی پین PIC16F870-I/SS
| پین 1 | MCLR/VPP/RA5 — Master Clear (reset) input / programming voltage / PORTA bit 5 |
| پین 2 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| پین 3 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| پین 4 | RA2/AN2/CVREF — PORTA bit 2 / Analog input channel 2 / Comparator voltage reference output |
| پین 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input channel 3 / Positive voltage reference |
| پین 6 | RA4/AN4/T0CKI — PORTA bit 4 / Analog input channel 4 / Timer 0 clock input |
| پین 7 | RA5/AN5/SS — PORTA bit 5 / Analog input channel 5 / Slave Select for SPI |
| پین 8 | VSS — Ground reference |
| پین 9 | OSC1/CLKI — Crystal oscillator input / external clock input |
| پین 10 | OSC2/CLKO — Crystal oscillator output / clock output |
| پین 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer 1 oscillator output / Timer 1 clock input |
| پین 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer 1 oscillator input / CCP2 module |
| پین 13 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| پین 14 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| پین 15 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| پین 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| پین 17 | RC6/TX/CK — PORTC bit 6 / USART transmit / clock |
| پین 18 | RC7/RX/DT — PORTC bit 7 / USART receive / data |
| پین 19 | VSS — Ground reference |
| پین 20 | VDD — Positive supply voltage |
| پین 21 | RB0/INT — PORTB bit 0 / External interrupt |
| پین 22 | RB1 — PORTB bit 1 |
| پین 23 | RB2 — PORTB bit 2 |
| پین 24 | RB3/PGM — PORTB bit 3 / Low-voltage programming input |
| پین 25 | RB4 — PORTB bit 4 |
| پین 26 | RB5/PGM — PORTB bit 5 / Low-voltage programming input |
| پین 27 | RB6/PGC — PORTB bit 6 / ICSP clock |
| پین 28 | RB7/PGD — PORTB bit 7 / ICSP data |
کاربردهای معمول
PIC16F870-I/SS مناسب است برای 6 کاربردs: Industrial Sensor Monitoring, Small Appliance Control, HVAC Fan and Blower Controller, Battery Charging Regulator, Automotive Body Electronics, Low-End Instrumentation and Data Loggers.
Industrial Sensor Monitoring
The PIC16F870-I/SS fits industrial sensor monitoring nodes where a compact SSOP-28 footprint, 5-channel 10-bit ADC, and USART serial communication are needed. Its 3.5 KB flash comfortably hosts RTD/thermocouple linearization tables and Modbus RTU framing logic for a single sensor node. The 22 I/O pins accommodate 4-20 mA loop interfaces, status LEDs, and watchdog relay drivers. The -40 C to +85 C industrial temperature rating supports factory-floor deployments. Pair with a PIC16F870-I/SS to scale cost-sensitive distributed sensor networks across 24 V industrial rails.
پیشنهادی
Small Appliance Control
The PIC16F870-I/SS powers small appliance controllers such as coffee makers, bread machines, and countertop ovens. Its Capture/Compare/PWM module drives TRIAC phase-angle control for heating elements, while the 16-bit timer provides precise timing for brew cycles and toasting profiles. The 5-channel ADC reads NTC thermistors, water-level sensors, and keypad inputs. With 22 I/O pins, the same die handles LCD multiplexing, buzzer drive, and safety interlocks in a single chip, reducing BOM cost. Self-programming flash supports late-stage firmware customization per appliance model.
پیشنهادی
HVAC Fan and Blower Controller
The PIC16F870-I/SS controls variable-speed HVAC fans using its CCP PWM module and 16-bit timer to generate phase-correct PWM up to 20 kHz. The 5-channel ADC samples temperature, humidity, and pressure sensors, while the USART relays status to the building management system via RS-485. The 128 B RAM holds current fan curve tables, and 3.5 KB flash fits state-machine control logic plus fault diagnostics. Industrial temperature range and 22 I/O support optocoupled triac drivers and tachometer feedback. Deploy with a PIC16F870-I/SS as the main controller and PIC12F series as remote sensor endpoints.
پیشنهادی
Battery Charging Regulator
The PIC16F870-I/SS implements CC/CV battery charging profiles using its 10-bit ADC for voltage and current sensing, plus the PWM module for buck-converter duty-cycle control. The 64 B EEPROM stores charging profiles for Li-Ion, NiMH, and lead-acid chemistries without rewriting flash. The MSSP I2C interface talks to battery gas gauges and SMBus smart batteries, while the USART provides diagnostics to a host controller. With 128 B RAM and 3.5 KB flash, full state-machine charging logic fits. The 4.0 V to 5.5 V supply range accommodates single-cell Li-Ion plus boost converters.
پیشنهادی
Automotive Body Electronics
The PIC16F870-I/SS supports automotive body modules such as seat controllers, mirror adjusters, and lighting dimmers. Its 22 I/O drive H-bridges and LED strings via MOSFET gate drivers, while the ADC reads Hall-effect position sensors and current shunts. The USART/MSSP interfaces connect to LIN or CAN sub-modules for body-network integration. While the industrial -I variant operates to +85 C, automotive designs typically select the PIC16F870-E/SS extended-temperature variant from the same die. The SSOP-28 footprint fits tight door-panel and headliner PCB layouts.
پیشنهادی
Low-End Instrumentation and Data Loggers
The PIC16F870-I/SS powers low-cost portable instrumentation such as hand-held multimeters, pH meters, and environmental data loggers. Its 10-bit ADC captures sensor signals at up to 5 channels, and the 64 B EEPROM stores calibration constants between power cycles. The 128 B RAM buffers sample arrays before flushing to external EEPROM via I2C. The USART streams logged data to a PC for analysis. Industrial temperature support and low nanoWatt sleep current extend battery life in field-deployed instruments. Designers leverage self-programming flash for bootloader-style firmware updates in the field.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC16F870-I/SS — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC16F870-E/SS | PIC16F870T-I/SS | PIC16LF870-I/SS | PIC16F870-I/SP | PIC16F876A-I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP (0.65 mm pitch) | 28-SSOP (0.65 mm pitch) - same | 28-SSOP (0.65 mm pitch) - same | 28-SSOP (0.65 mm pitch) - same | 28-SPDIP (1.778 mm pitch) - through-hole | 28-SSOP (0.65 mm pitch) - same |
| Program Memory (Flash) | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) | 14 KB (8K x 14) |
| Data RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 368 bytes |
| Data EEPROM | 64 bytes | 64 bytes | 64 bytes | 64 bytes | 64 bytes | 256 bytes |
| Operating Voltage | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 2.0 V to 5.5 V | 4.0 V to 5.5 V | 2.0 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| ADC Channels / Resolution | 5 channels / 10-bit | 5 channels / 10-bit | 5 channels / 10-bit | 5 channels / 10-bit | 5 channels / 10-bit | 8 channels / 10-bit |
| I/O Pins | 22 | 22 | 22 | 22 | 22 | 22 |
| Unit Price (qty 1) | $3.85 | $4.10 (extended temp premium) | $3.85 | $4.05 (low-voltage variant) | $3.95 (through-hole) | $5.20 |
تفاوت‌های کلیدی
- Same SSOP-28 footprint with extended-temperature operation (در مقابلPIC16F870-E/SS)
- Low-voltage variant for battery-powered designs (در مقابلPIC16LF870-I/SS)
- Drop-in SSOP-28 upgrade with 4x more flash and RAM (در مقابلPIC16F876A-I/SS)
- Through-hole alternative with identical electrical ratings (در مقابلPIC16F870-I/SP)
یادداشت‌های طراحی
Place a 0.1 uF decoupling capacitor within 5 mm of each VDD pin (pin 20) and a bulk 10 uF tantalum or ceramic capacitor on the same VDD trace. For battery-backed designs, the PIC16F870 supports nanoWatt sleep mode at sub-microamp quiescent current; verify the BOR (Brown-Out Reset) voltage is configured above the minimum operating voltage to avoid spurious resets during supply collapse. Estimated: at 20 MHz and 5 V supply, the active current is typically 11 mA, so the bulk capacitor must supply transient peaks above this level.
Route the crystal between OSC1 (pin 9) and OSC2 (pin 10) with traces no longer than 10 mm and grounded guard traces on either side to minimize EMI coupling. Place load capacitors (typically 15-33 pF for HS mode) close to the crystal pins. For ICD debugging, ensure the PGC (pin 27) and PGD (pin 28) lines are not loaded with more than 50 pF of stray capacitance to avoid programming failures. The MCLR pull-up resistor (typically 10 kOhm) must be placed within 5 mm of pin 1 to ensure reliable reset.
Do not leave unused I/O pins floating; configure them as outputs driving low to minimize current draw in CMOS inputs. The PIC16F870's analog inputs (AN0-AN5) require the TRISA register to set the pin as input AND the ADCON1 register to configure digital or analog mode - forgetting the ADCON1 step causes the ADC to read garbage or short analog channels to digital logic. The MSSP module in I2C mode requires external pull-up resistors (typically 4.7 kOhm) on SDA and SCL; the PIC16F870 has weak internal pull-ups but they are insufficient for reliable multi-master operation.
For long-trace USART connections (>50 mm), place a series resistor (100 ohm) close to the TX pin to dampen reflections on the line. The USART baud-rate error must be calculated against the actual oscillator frequency; for 20 MHz operation the error is typically below 1 percent at common baud rates. The ADC sampling time is governed by the ADC clock select bits (ADCS2:ADCS0); at 20 MHz system clock, use Fosc/32 or slower for full 10-bit accuracy. ADC input impedance during sample is approximately 10 kOhm, so source impedances above 5 kOhm require an external buffer amplifier.
اطلاعات انطباق
RoHS compliant per Microchip product page. PIC16F870-I/SS industrial temperature grade is not AEC-Q100 qualified; PIC16F870-E/SS extended temperature variant is recommended for automotive-grade deployments.
