PIC16LC55AT-04/SS - 4MHz 768B OTP 8-bit MCU 28-SSOP | Microchip
MPN: PIC16LC55AT-04/SS ✓ فعالPIC16LC55AT-04/SS جائزہ
An 8-bit microcontroller is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral interfaces on one die. It belongs to the broader category of microcontrollers (MCU) -> embedded microcontrollers -> 8-bit MCUs -> CMOS RISC microcontrollers -> semiconductor ICs. The PIC16C5X family specifically uses a Harvard RISC architecture with only 33 single-word single-cycle instructions, making code density high and execution deterministic — a key reason these MCUs dominated low-cost embedded designs from the mid-1990s onward.
Key features include 768 bytes of OTP EPROM (12-bit word width), 25 bytes of general-purpose RAM, 12 bidirectional I/O pins, a watchdog timer with on-chip RC oscillator, a power-on reset circuit, and an 8-bit real-time timer/counter (RTCC). The "LC" prefix indicates a low-power CMOS variant with an extended supply voltage range of 3 V to 6.25 V, allowing operation from two AA cells or 5 V rails. The "04" speed suffix specifies 4 MHz maximum oscillator frequency.
Architecturally, the device uses a 12-bit instruction word with a 2-stage pipeline, so most instructions execute in a single 250 ns clock cycle at 4 MHz. The OTP memory is programmed via Microchip's ICSP (In-Circuit Serial Programming) protocol, eliminating the need for a separate programmer socket. An 8-bit prescaler extends the RTCC and watchdog timing, and the internal RC oscillator provides a low-cost clock option without external crystals.
Typical applications include consumer appliances, low-end toys and educational devices, simple sensor interfaces, battery-powered remote controls, and white-goods controllers. The wide 3 V to 6.25 V supply range also makes the part a fit for 5 V industrial control boards and automotive accessory modules (where the /I industrial or /E extended temperature grade is required instead).
A key design consideration is that the OTP memory can be programmed only once; for prototyping or field-updatable firmware, choose the PIC16F55 or PIC16CR55 sibling that uses Flash or ROM instead. Also note that this part is built on a legacy 16C5X core — modern designs should consider PIC16F1xxx or PIC16F1xxxx families for active migration paths.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
کے لیے ڈراپ اِن متبادل PIC16LC55AT-04/SS — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں PIC16LC55AT-04/SS (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, Timers, Core Architecture, I/O Pins, Instruction Set.
PIC16C55A-04/SS
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16LC55A-04I/SS
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16LC55AT-04I/SS
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
PIC16F55-I/SS
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
PIC16LC558T-04/SO
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16LC55AT-04/SS زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Core Architecture | 8-bit RISC (PIC16C5X Harvard) |
| Instruction Set | 33 single-word instructions |
| CPU Speed | 4 MHz (250 ns instruction cycle) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 768 B (512 x 12 bits) |
| Data RAM | 25 B |
| I/O Pins | 12 |
| Timers | 1 x 8-bit RTCC + WDT with on-chip RC |
| Supply Voltage Range | 3 V to 6.25 V (LC low-power) |
| پیکیج | 28-SSOP (0.209 inch / 5.30 mm body) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| Temperature Grade | Commercial (PIC16LC55A-04/SS) |
| Oscillator Options | External RC / Crystal / Internal RC |
| Programming Method | ICSP (In-Circuit Serial Programming) |
| RoHS اسٹیٹس | Compliant per Microchip product page |
PIC16LC55AT-04/SS پن کنفیگریشن
| پن 1 | RA0 — Bidirectional I/O port A bit 0 |
| پن 2 | RA1 — Bidirectional I/O port A bit 1 |
| پن 3 | RA2 — Bidirectional I/O port A bit 2 |
| پن 4 | RA3 — Bidirectional I/O port A bit 3 |
| پن 5 | RB0 — Bidirectional I/O port B bit 0 / ICSP data |
| پن 6 | RB1 — Bidirectional I/O port B bit 1 |
| پن 7 | RB2 — Bidirectional I/O port B bit 2 |
| پن 8 | RB3 — Bidirectional I/O port B bit 3 |
| پن 9 | RB4 — Bidirectional I/O port B bit 4 |
| پن 10 | RB5 — Bidirectional I/O port B bit 5 |
| پن 11 | RB6 — Bidirectional I/O port B bit 6 / ICSP clock |
| پن 12 | RB7 — Bidirectional I/O port B bit 7 |
| پن 13 | RC0 — Bidirectional I/O port C bit 0 |
| پن 14 | VSS — Ground reference |
| پن 15 | RC1 — Bidirectional I/O port C bit 1 |
| پن 16 | RC2 — Bidirectional I/O port C bit 2 |
| پن 17 | RC3 — Bidirectional I/O port C bit 3 |
| پن 18 | RC4 — Bidirectional I/O port C bit 4 |
| پن 19 | RC5 — Bidirectional I/O port C bit 5 |
| پن 20 | RC6 — Bidirectional I/O port C bit 6 |
| پن 21 | RC7 — Bidirectional I/O port C bit 7 |
| پن 22 | OSC1 — Oscillator input / external clock |
| پن 23 | OSC2 — Oscillator output (crystal mode) |
| پن 24 | VDD — Positive supply (3.0 V to 6.25 V) |
| پن 25 | MCLR/VPP — Master clear reset (active low) / programming voltage |
| پن 26 | T0CKI — Timer0 clock input |
| پن 27 | RTCC — Real-time clock/counter output |
| پن 28 | NC — Not connected (per datasheet) |
عام استعمالات
PIC16LC55AT-04/SS کے لیے موزوں ہے 7 ایپلیکیشنs: Consumer Appliance Controllers, Battery-Powered Remote Controls, Educational and Toy Electronics, Industrial Sensor Interfaces, Automotive Accessory Modules, White-Goods User Interface Boards, Simple Sensor Hubs.
Consumer Appliance Controllers
The PIC16LC55AT-04/SS fits consumer appliance controllers — washing-machine keypads, microwave user interfaces, low-end air-conditioner remotes — because its 12 I/O lines directly drive 7-segment displays, matrix keypads, and triac-trigger optos without external glue logic. The 4 MHz CPU executes scan loops in well under 1 ms, and the 3.0-6.25 V LC supply tolerates rectified 5 V rails without an LDO. The 768 B OTP holds typical user-interface firmware; the part is cost-optimized for high-volume SKUs where per-unit MCU pricing is paramount.
تجویز کردہ
Battery-Powered Remote Controls
The PIC16LC55AT-04/SS is well-suited for battery-powered remote controls (TV, set-top, garage-door, key-fob) because its 3.0-6.25 V LC supply operates directly from two AA cells, and the PIC16C5X core's sleep current is in the microamp range when the WDT-driven wakeup is used. The 4 MHz CPU wakes instantly for IR carrier generation (typically 38 kHz), and 12 I/O drive IR LEDs, keypad matrix, and indicator LEDs without external logic. The 768 B OTP fits standard remote-control firmware with multiple device codes.
تجویز کردہ
Educational and Toy Electronics
The PIC16LC55AT-04/SS is a canonical educational and toy-electronics MCU because the PIC16C5X instruction set is small (33 instructions), the OTP cost is minimal at high volume, and Microchip's free MPLAB X IDE with MPASM/XC8 toolchain supports the part out of the box. Hobbyists use it for blinking-LED trainers, line-following robots, and simple talking toys. The 28-SSOP package is breadboard-friendly via SSOP-to-DIP adapters, and 768 B OTP is enough for animated sequences and basic sensor feedback loops.
تجویز کردہ
Industrial Sensor Interfaces
The PIC16LC55AT-04/SS handles industrial sensor interface modules (limit switches, photoelectric sensors, proximity probes) because its 12 I/O lines are split across ports sufficient for sensor input, alarm output, and serial communication. The 3.0-6.25 V supply rails run from a regulated 24 V industrial bus via a small LDO. The /I industrial-grade variant (PIC16LC55AT-04I/SS) covers -40C to +85C. The 4 MHz CPU bit-bangs Modbus RTU or simple UART protocols at 9600 baud with minimal firmware overhead.
تجویز کردہ
Automotive Accessory Modules
The PIC16LC55AT-04/SS /I variant fits automotive accessory modules (interior lighting controllers, seat-heater keypads, generic body controllers) because its 3.0-6.25 V LC supply tolerates 12 V battery transients when paired with a TVS diode and bulk capacitor. The industrial -40C to +85C temperature grade covers cabin environments, and the 12 I/O drive LEDs, switches, and LIN-bus transceivers. Note that AEC-Q100 qualification is NOT held by this part; for safety-critical modules, migrate to PIC16F1xxx AEC-Q100 grades.
تجویز کردہ
White-Goods User Interface Boards
The PIC16LC55AT-04/SS is widely deployed in white-goods user interface boards (dishwasher panels, refrigerator displays, oven timers) because the 28-SSOP footprint is compact enough for slim door panels, the 12 I/O drive 7-segment LCD/LED multiplex directly, and the OTP cost-per-unit is below Flash equivalents at million-unit volumes. The 3.0-6.25 V LC supply accepts rectified 5 V or 12 V rails. The 4 MHz CPU handles button debouncing, encoder tracking, and beeper control with substantial firmware headroom.
تجویز کردہ
Simple Sensor Hubs
The PIC16LC55AT-04/SS serves as a simple sensor hub in low-cost data loggers, environmental monitors, and HVAC zone controllers because its 4 MHz core reads multiple I/O sensors sequentially, applies moving-average filtering in firmware, and outputs via UART or PWM. The 768 B OTP accommodates 4-5 channels of 10-bit equivalent sensor reading with averaging. The 25 B RAM is tight but workable for circular buffers. For higher-channel-count designs, step up to PIC16F1xxx with 14-bit ADC and DMA.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا PIC16LC55AT-04/SS — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | PIC16C55A-04/SS | PIC16LC55A-04I/SS | PIC16LC55AT-04I/SS | PIC16F55-I/SS | PIC16LC558T-04/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SOIC - larger body but pin-compatible |
| Program Memory Type | OTP EPROM (768 B) | Mask ROM (768 B) | OTP EPROM (768 B) | OTP EPROM (768 B) | Flash (re-programmable) | OTP EPROM (768 B) |
| CPU Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 12 |
| Supply Voltage | 3.0 V to 6.25 V (LC) | 4.5 V to 5.5 V (standard) | 3.0 V to 6.25 V (LC) | 3.0 V to 6.25 V (LC) | 2.0 V to 5.5 V | 3.0 V to 6.25 V (LC) |
| Temperature Grade | Commercial (0C to +70C) | Commercial | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Commercial |
اہم امتیازی خصوصیات
- OTP EPROM programming for lowest die cost in high volume (بمقابلہPIC16F55-I/SS)
- Wide 3.0 V to 6.25 V LC supply range supports battery and 5 V rails (بمقابلہPIC16C55A-04/SS)
- Compact 28-SSOP footprint saves PCB area over 28-SOIC (بمقابلہPIC16LC558T-04/SO)
ڈیزائن نوٹس
Estimated: the PIC16LC55AT-04/SS draws roughly 2 mA active at 4 MHz / 5 V and under 4 uA in SLEEP mode with WDT disabled, per the PIC16C5X family datasheet. Add a 100 nF decoupling capacitor as close as possible to VDD (pin 24), and a 10 uF bulk capacitor on the 5 V rail. For 3 V battery designs, include a 100 kohm pull-up on MCLR (pin 25) and a series resistor on the ICSP clock line (RB6) to prevent leakage paths in sleep.
Route the 28-SSOP footprint with 0.65 mm pitch SOIC-style land patterns; Microchip publishes reference land dimensions in the SSOP package specification. Keep the MCLR/VPP trace short and away from switching nodes to avoid spurious resets. The OSC1/OSC2 pins should be guarded with a ground ring if a crystal is used; for cost-sensitive designs using the internal RC oscillator, leave OSC2 floating or pulled low to avoid stray coupling.
Do not attempt to erase OTP memory — it is One-Time Programmable by definition, so firmware bugs require a new physical part. Verify all firmware on a PIC16F55 Flash prototype before committing to OTP volume. Also note that the 16C5X core has no hardware UART; UART communication must be bit-banged on any I/O pin using the RTCC or a tight instruction loop. Finally, ensure the supply voltage does not exceed 6.25 V even on transient spikes — add a TVS diode if the design sees inductive loads.
Place the ICSP connector (typically a 5-pin header with VPP/VSS/VDD/RB6/RB7) on the same PCB edge as the MCU so production programming is straightforward. If the board is double-sided, route RB6 and RB7 on the top layer directly under the connector pads to minimize stray capacitance during high-speed ICSP. For low-EMI designs, place the crystal within 5 mm of OSC1/OSC2 and surround it with a ground pour stitched with vias every 5 mm.
تعمیل کی معلومات
RoHS and REACH compliance per Microchip product page. Lead-free and halogen-free per Microchip packaging specifications. AEC-Q100 not held — for automotive safety modules, migrate to PIC16F1xxx AEC-Q100 grades.
