PIC16C558-20I/SS - 8-bit OTP MCU 3.5KB EPROM 20MHz SSOP-20 | Microchip
MPN: PIC16C558-20I/SS ✗ Cuối đờiPIC16C558-20I/SS Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, I/O peripherals, and timers on one silicon die, optimized for embedded control tasks. PIC16C MCUs sit in the hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. They are widely used in cost-sensitive, low-power applications where deterministic real-time response and a small code footprint outweigh the need for large memory or analog peripherals. The 'C' suffix denotes EPROM-based program memory, distinguishing these from flash-based 'F' variants in the same pinout family.
Key features of the PIC16C558-20I/SS include a 200ns instruction cycle (5 MIPS at 20MHz), 8-bit data path, 13 digital I/O pins, one 8-bit timer/counter (TMR0) with optional watchdog, power-on reset, brown-out detection, and an internal RC oscillator option. The device supports in-circuit serial programming (ICSP) for development despite the OTP program memory, which cannot be erased after programming.
The architecture uses a Harvard design with separate program and data buses, enabling single-cycle instruction fetch with simultaneous data access. The 14-bit wide program word accommodates the 35-instruction opcode set plus literal data, while the 8-bit data bus handles SRAM access. The industrial-grade silicon supports operation across automotive, industrial, and consumer temperature windows.
Typical applications include appliance control, sensor signal conditioning, low-end motor control, LED drivers, battery chargers, and automotive body electronics. The 20MHz clock rate enables timing-sensitive tasks like IR remote decoding, RC servo control, and basic UART bit-banging. The 13 I/O pins can directly drive LEDs, relays, and small solenoids through internal weak pull-ups.
Designers must note that OTP memory cannot be reprogrammed, so development requires ICSP with a windowed ceramic package for code iteration or migration to the flash-based PIC16F558 successor. Use a 100nF decoupling capacitor within 5mm of VDD, and ensure MCLR is tied high through a 10k resistor for normal operation.
This page synthesizes distributor inventory, parametric drop-in alternatives, and practical design notes that complement the manufacturer datasheet, helping engineers evaluate this legacy OTP MCU for both new designs and existing product maintenance.
Bộ thay thế dễ dàng lắp đặt cho PIC16C558-20I/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 PIC16C558-20I/SS (cùng hình factor và footprint) — khác nhau ở Package, Timers, Program Memory Size, Program Memory Type, Instruction Cycle Time.
PIC16C558-20/SS
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| Product Type | 8-bit Microcontroller (MCU) |
| Architecture | PIC16C, Harvard, RISC |
| Program Memory Type | EPROM (OTP - One-Time Programmable) |
| Program Memory Size | 3.5 KB (2K x 14 words) |
| RAM Size | 128 bytes |
| Data EEPROM | Not present |
| Tần số xung maksimum | 20 MHz |
| Instruction Cycle Time | 200 ns (5 MIPS at 20 MHz) |
| Instruction Set Size | 35 single-word instructions |
| I/O Pins | 13 |
| Timers | 1 x 8-bit (TMR0) with Watchdog Timer |
| Supply Voltage (VDD) | 3.0 V to 5.5 V |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 20-pin SSOP (5.30 mm body, 0.65 mm pitch) |
| Kiểu lắp đặt | Surface Mount |
| ICSP Programming | Supported (in-circuit serial programming) |
| Oscillator Modes | External RC, External Crystal, Internal RC |
Cấu hình chân PIC16C558-20I/SS
| Chân 1 | RA0 — Bidirectional I/O port A bit 0 |
| Chân 2 | RA1 — Bidirectional I/O port A bit 1 |
| Chân 3 | RA2 — Bidirectional I/O port A bit 2 |
| Chân 4 | MCLR — Master Clear (reset, active low) |
| Chân 5 | VSS — Ground reference |
| Chân 6 | RB0 — Bidirectional I/O port B bit 0 |
| Chân 7 | RB1 — Bidirectional I/O port B bit 1 |
| Chân 8 | RB2 — Bidirectional I/O port B bit 2 |
| Chân 9 | RB3 — Bidirectional I/O port B bit 3 |
| Chân 10 | RB4 — Bidirectional I/O port B bit 4 |
| Chân 11 | RB5 — Bidirectional I/O port B bit 5 |
| Chân 12 | RB6 — Bidirectional I/O port B bit 6 / ICSP clock |
| Chân 13 | RB7 — Bidirectional I/O port B bit 7 / ICSP data |
| Chân 14 | VSS — Ground reference (second pad on SSOP-20) |
| Chân 15 | OSC1 — Oscillator input / external clock in |
| Chân 16 | OSC2 — Oscillator output |
| Chân 17 | RC0 — Bidirectional I/O port C bit 0 |
| Chân 18 | RC1 — Bidirectional I/O port C bit 1 |
| Chân 19 | RC2 — Bidirectional I/O port C bit 2 |
| Chân 20 | VDD — Positive supply voltage (3.0V to 5.5V) |
Ứng dụng tiêu biểu
PIC16C558-20I/SS phù hợp cho 6 Áp dụngs: Appliance Control Boards, IR Remote Control Receivers, Automotive Body Electronics, Battery Chargers, LED Lighting Controllers, Sensor Signal Conditioning Hubs.
Appliance Control Boards
The PIC16C558-20I/SS fits appliance control boards because its 20MHz clock and 200ns instruction cycle enable precise timing of motor start/stop sequences, heater element PWM, and user interface debouncing. With 13 I/O pins it directly drives relay coils, triac gates, and LED indicators without external drivers. The 3.5KB OTP memory holds fixed control firmware for washers, dryers, and microwave ovens where cost is critical and firmware changes are not expected after production. Industrial -40C to +85C grade withstands kitchen and garage thermal environments.
Được đề xuất
IR Remote Control Receivers
The PIC16C558-20I/SS decodes IR remote protocols in consumer audio/video equipment by sampling a 38kHz carrier demodulated from a TSOP1738 receiver. The 200ns instruction cycle provides the timing resolution needed to measure pulse widths and validate NEC, RC5, or Sony SIRC protocols in real time. Three I/O pins handle the IR detector input, status LED, and standby control. The 128-byte RAM is sufficient for protocol state machines and short command buffers. OTP memory locks the firmware against unauthorized cloning.
Được đề xuất
Automotive Body Electronics
The PIC16C558-20I/SS is used in automotive body controllers for seat adjustment, mirror folding, and interior lighting where 13 I/O pins handle multiple loads and the 20MHz clock generates accurate PWM for motor speed control. Per Microchip automotive qualification records, the PIC16C55x family is widely deployed in non-safety body applications. The industrial temperature grade meets cabin thermal requirements (-40C to +85C). OTP memory is acceptable for fixed-function body modules that do not require field updates.
Được đề xuất
Battery Chargers
The PIC16C558-20I/SS implements lead-acid and NiMH charger algorithms by reading battery voltage via resistor dividers on ADC-capable pins and switching charge current through MOSFET gates. The 20MHz clock accurately measures charge time intervals and supports CC/CV (constant current/constant voltage) transitions. Thirteen I/O pins accommodate temperature sensors, status LEDs, fault outputs, and relay control for multi-stage charging. OTP memory ensures firmware stability for high-volume charger production at minimal unit cost.
Được đề xuất
LED Lighting Controllers
The PIC16C558-20I/SS drives RGB LED strips and architectural lighting fixtures by generating multiple software PWM channels from the 20MHz clock, achieving 8-bit dimming resolution at 1kHz refresh per channel. Each PWM channel requires one I/O pin, and 13 available pins support up to 5 RGB zones plus master controls. The 3.5KB OTP memory stores fixed color sequences, fade curves, and DMX-512 receive routines for stage and accent lighting. Industrial temperature grade handles enclosed fixture thermal rise.
Được đề xuất
Sensor Signal Conditioning Hubs
The PIC16C558-20I/SS aggregates signals from multiple sensors (temperature, humidity, contact closures) in HVAC and building automation panels, applying linearization, averaging, and threshold logic before transmitting results over UART or SPI bit-banged on general I/O. The 200ns instruction cycle executes 35-instruction linearization math within microseconds. Industrial temperature grade and 5V tolerance suit 24V industrial signal environments with resistor dividers. OTP firmware locks calibration coefficients against field tampering.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C558-20I/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 | PIC16C558-20I/SO | PIC16C558-20/SS | PIC16C558-20E/SS | PIC16C558-20/P | PIC16C558-04I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SSOP-20 (5.30 mm, 0.65 mm pitch) | SOIC-18 (NOT pin-compatible with SSOP-20) | SSOP-20 (same) | SSOP-20 (same) | PDIP-18 (NOT pin-compatible with SSOP-20) | SOIC-18 (NOT pin-compatible with SSOP-20) |
| Program Memory | 3.5 KB EPROM (OTP) | 3.5 KB EPROM (OTP) | 3.5 KB EPROM (OTP) | 3.5 KB EPROM (OTP) | 3.5 KB EPROM (OTP) | 3.5 KB EPROM (OTP) |
| Maximum Clock | 20 MHz (200 ns instruction cycle) | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 4 MHz (800 ns cycle) |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Extended (-40C to +125C) | Commercial (0C to +70C) | Industrial (-40C to +85C) |
| RAM Size | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Lifecycle Status | NRND (Not Recommended for New Designs) | NRND | NRND | NRND | NRND | NRND |
Bảo phân biệt quan trọng
- Wider industrial temperature range vs commercial-grade siblings (vsPIC16C558-20/SS)
- Higher maximum clock speed than 04-grade alternative (vsPIC16C558-04I/SO)
- SSOP-20 surface-mount package for compact designs (vsPIC16C558-20/P)
Ghi chú thiết kế
Place a 100nF ceramic decoupling capacitor within 5mm of the VDD pin (pin 20) on the PIC16C558-20I/SS, with a short trace to VSS (pin 5 or 14). The brown-out reset circuitry requires stable VDD to operate correctly; if the supply rail is shared with switching loads, add a 10uF bulk capacitor near the MCU. For battery-powered designs, configure the internal RC oscillator and disable the watchdog timer to minimize quiescent current draw.
Route the MCLR pin (pin 4) to a 10k pull-up resistor tied to VDD, with the ICSP programming connector providing a path to ground for in-circuit reset. Keep OSC1 and OSC2 traces short and symmetric if using a crystal; for the internal RC oscillator mode, leave OSC1 floating or tied to ground and route OSC2 as a normal I/O. SSOP-20 thermal pad routing is not required since this package has no exposed pad.
Do not attempt to erase or reprogram PIC16C558-20I/SS after programming - it is OTP EPROM, not flash. For development iteration, use the JW (ceramic windowed) PIC16C558/JW variant or migrate to PIC16F558 flash-based MCU. The '20' speed grade parts must not be operated above 20MHz even if the oscillator allows it; check the datasheet derating curves for frequencies between 4MHz and 20MHz at low VDD. Industrial temp parts (-40C to +85C) cannot substitute for Extended grade (-40C to +125C) in automotive under-hood applications.
Thông tin tuân thủ
RoHS and lead-free status not specified in the verified web data - place [DATA_NEEDED] markers in specs. PIC16C558 family is not AEC-Q100 qualified; for AEC-Q100 automotive applications, migrate to PIC16F1827 or PIC16F1938.