PIC16C56T-XTI/SO - 8-Bit 4MHz OTP MCU 1.5KB | Microchip
MPN: PIC16C56T-XTI/SO ✗ Cuối đờiPIC16C56T-XTI/SO Tóm tắt
Background: A PIC microcontroller is a single-chip computer that integrates a CPU core, program memory, RAM, and I/O peripherals on one piece of silicon. The PIC16C5X family is the lowest-tier PIC family, using a 12-bit instruction set, an 8-bit data path, and RISC-like fixed instruction timing. It belongs to the broader taxonomy: microcontroller -> 8-bit MCU -> CMOS OTP MCU -> PIC16C5X family. OTP devices are programmed once with a device programmer (such as the MPLAB PM3) and are not field-reprogrammable, making them well suited to high-volume, fixed-function products where firmware is finalized before production.
Key features include a Power-On Reset (POR) block that initializes the device on Vdd rise, a Watchdog Timer (WDT) that resets the device on code lock-up, an internal oscillator option that reduces external component count, and a 12-bit wide instruction word that compresses frequently used operations into single-cycle instructions. The PIC16C5X family operates over a 2.5 V to 5.5 V Vdd range (industrial) and supports a wide industrial temperature window, making it well matched to factory-floor embedded designs. The 'XT' speed grade specifies a 4 MHz crystal/ceramic-resonator clock mode, and 'I' denotes the industrial operating-temperature grade.
Typical applications include appliance controllers, security-system keypads, low-end remote controls, sensor signal-conditioning front-ends, and white-goods motor-control boards. The industrial temperature grade allows deployment in outdoor enclosures and automotive under-hood sub-assemblies where commercial-grade parts would drift or fail. Because OTP memory cannot be rewritten in-circuit, PIC16C56T parts are most often used in mature designs where firmware has already been qualified.
When designing with this MCU, verify that your in-circuit emulator or device programmer (PM3, PICSTART Plus) supports the PIC16C56 device ID and the 18-pin SOIC socket adapter. The EPROM die is erasable with a quartz-window ceramic package variant (PIC16C56/JW); the plastic SOIC version here is OTP only and not UV-erasable.
Bộ thay thế dễ dàng lắp đặt cho PIC16C56T-XTI/SO — 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 PIC16C56T-XTI/SO (cùng hình factor và footprint) — khác nhau ở Program Memory Size, Program Memory Type, Package, Timers, Mounting Type.
PIC16C57-XTI/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C56-HSI/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C56-XTI/SO
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C56T-RCI/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C56-LPI/SO
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16C55-XTI/SO
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16C56T-XTI/SO Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit (12-bit instruction word) |
| Family | PIC16C5X |
| Program Memory Type | OTP (One-Time-Programmable) EPROM |
| Program Memory Size | 1.5 KB (1K x 12) |
| RAM Size | 25 x 8 bytes |
| Maximum CPU Frequency | 4 MHz |
| Operating Voltage (Vdd) | 2.5 V to 5.5 V (industrial grade) |
| Oscillator Mode | XT (crystal/ceramic resonator, 4 MHz) |
| Operating Temperature Grade | Industrial (-40C to +85C) |
| I/O Pins | 12 |
| Hộp | 18-SOIC (0.295 inch / 7.50 mm body width) |
| Kiểu lắp đặt | Surface Mount |
| Peripherals | Power-On Reset (POR), Watchdog Timer (WDT) |
| Instruction Set Width | 12-bit |
| Data Path Width | 8-bit |
Cấu hình chân PIC16C56T-XTI/SO
| Chân 1 | RA2/AN2 — I/O port A bit 2 / analog input 2 |
| Chân 2 | RA3/AN3 — I/O port A bit 3 / analog input 3 |
| Chân 3 | RA4/T0CKI — I/O port A bit 4 / Timer0 clock input |
| Chân 4 | MCLR — Master Clear (reset) input, active low |
| Chân 5 | VSS — Ground reference |
| Chân 6 | RB0/INT — I/O port B bit 0 / external interrupt |
| Chân 7 | RB1 — I/O port B bit 1 |
| Chân 8 | RB2 — I/O port B bit 2 |
| Chân 9 | RB3 — I/O port B bit 3 |
| Chân 10 | RB4 — I/O port B bit 4 |
| Chân 11 | RB5 — I/O port B bit 5 |
| Chân 12 | RB6 — I/O port B bit 6 |
| Chân 13 | RB7 — I/O port B bit 7 |
| Chân 14 | VSS — Ground reference (secondary) |
| Chân 15 | OSC1/CLKIN — Oscillator input / external clock in |
| Chân 16 | OSC2/CLKOUT — Oscillator output / clock out |
| Chân 17 | RA0/AN0 — I/O port A bit 0 / analog input 0 |
| Chân 18 | RA1/AN1 — I/O port A bit 1 / analog input 1 |
Ứng dụng tiêu biểu
PIC16C56T-XTI/SO phù hợp cho 6 Áp dụngs: Appliance Control Boards, Security Keypad Controllers, Remote Control Transmitters, Sensor Signal-Conditioning Front-Ends, White-Goods Motor Control, Automotive Under-Hood Sub-Assemblies.
Appliance Control Boards
The PIC16C56T-XTI/SO is well suited for fixed-function appliance controllers such as microwave ovens, washing machines, and dishwasher control panels. Its 1.5 KB OTP memory holds the typical motor-driver state machine plus user-interface button-scan logic without requiring external program storage. The 4 MHz XT oscillator provides deterministic 1 us instruction timing for mains-zero-crossing detection and triac/SCR phase-angle control. The 12 I/O pins drive the seven-segment or LCD indicator, relay drivers, and keypad matrix without external mux logic. Industrial -40C to +85C temperature grade tolerates the heat of an enclosed appliance compartment and the cold of an unheated garage.
Được đề xuất
Security Keypad Controllers
Standalone security-system keypads (door entry, alarm arm/disarm stations) frequently use the PIC16C56T-XTI/SO because OTP memory locks the PIN-decryption firmware against external read-out. The 25-byte RAM is sufficient to hold the rolling-code buffer and four-digit PIN while the 4 MHz core scans the 4x4 keypad matrix with no perceptible debounce delay. The Watchdog Timer (WDT) recovers the device from ESD-induced code runaway at the key contacts. The 18-SOIC wide-body package mounts flush on a backlit keypad PCB without crowding the piezo-buzzer driver. Industrial temperature grade handles outdoor gate-station installations.
Được đề xuất
Remote Control Transmitters
Low-end infrared or 315/433 MHz RF remote controls for ceiling fans, garage-door openers, and consumer A/V gear use the PIC16C56T-XTI/SO as the encoder. Its 1.5 KB OTP fits a typical 32-button matrix-scan plus Manchester- or PWM-encoded transmission routine. The 4 MHz XT oscillator rate generates a stable carrier frequency without trimming, and the POR block ensures clean start-up after long battery storage. Low-power PIC16C5X sleep current keeps the remote's coin-cell battery alive for years. The 18-SOIC is small enough for a thin remote housing.
Được đề xuất
Sensor Signal-Conditioning Front-Ends
Industrial sensor transmitters (4-20 mA loops, RTD/thermocouple cold-junction compensators, thermistor linearizers) embed the PIC16C56T-XTI/SO to perform lookup-table conversion, linearization, and HART-style modulation. The 4 MHz core runs a 10-bit sigma-delta conversion on a multiplexed analog input with no external ADC, and the 25-byte RAM holds a moving-average filter. Industrial temperature grade matches the sensor head environment. The Watchdog Timer recovers from sensor-line brown-out events.
Được đề xuất
White-Goods Motor Control
Washing-machine drain pumps, refrigerator compressor inverters, and dishwasher circulation pumps use the PIC16C56T-XTI/SO as a secondary supervisory controller. Its 12-bit instruction word executes zero-crossing triac firing and tachometer-capture logic in real time, offloading these tasks from the main VFD controller. The 18-SOIC package solders to a secondary logic board adjacent to the power stage, and the industrial temperature grade survives under-cabinet heat. OTP memory locks the safety interlock code against unauthorized drive-parameter tampering.
Được đề xuất
Automotive Under-Hood Sub-Assemblies
Non-safety automotive sub-assemblies such as seat heaters, mirror controllers, and HVAC damper actuators use industrial-temperature PIC16C56T-XTI/SO parts in non-AEC-Q100 applications. The -40C to +85C temperature grade handles under-dash environments (true under-hood applications require AEC-Q100 grade which the PIC16C56 family does not carry). The 4 MHz XT oscillator is stable against vibration better than internal-RC alternatives in this segment. 18-SOIC wide-body package suits through-hole-reflow secondary boards.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C56T-XTI/SO — 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 | PIC16C57-XTI/SO | PIC16C56-HSI/SO | PIC16C56-XTI/SO | PIC16C56T-RCI/SO | PIC16C55-XTI/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC (7.50 mm) | 18-SOIC (7.50 mm) - same | 18-SOIC (7.50 mm) - same | 18-SOIC (7.50 mm) - same | 18-SOIC (7.50 mm) - same | 18-SOIC (7.50 mm) - same |
| Program Memory | 1.5 KB (1K x 12) OTP | 3 KB (2K x 12) OTP | 1.5 KB (1K x 12) OTP | 1.5 KB (1K x 12) OTP | 1.5 KB (1K x 12) OTP | 0.75 KB (512 x 12) OTP |
| RAM Size | 25 x 8 bytes | 72 x 8 bytes | 25 x 8 bytes | 25 x 8 bytes | 25 x 8 bytes | 24 x 8 bytes |
| Max CPU Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Oscillator Mode | XT (external crystal 4 MHz) | XT | HS (internal high-speed option) | XT | RC (external resistor-capacitor) | XT |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| Pin Count | 18 | 18 | 18 | 18 | 18 | 18 |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| Memory Type | OTP (One-Time-Programmable) | OTP | OTP | OTP | OTP | OTP |
Bảo phân biệt quan trọng
- Industrial temperature grade as standard (vsPIC16C56-XT/SO (commercial 0C to +70C))
- Tape-and-reel packaging for SMT production (vsPIC16C56-XTI/SO (tube packaging))
- Same die as PIC16C57 with double program memory (vsPIC16C55-XTI/SO)
Ghi chú thiết kế
Estimated: The PIC16C56T-XTI/SO draws approximately 2-5 mA active current at 4 MHz and 5 V Vdd, and a few microamps in sleep mode (WDT disabled). A 100 nF decoupling capacitor must be placed within 5 mm of the VDD pin, with a 10 uF bulk capacitor on the same node. For battery-powered remotes, switch the device to sleep between tasks and gate the XT oscillator with the SLEEP instruction to reduce quiescent current below 1 uA. The MCLR pin requires a 10 kohm pull-up to VDD and a 100 nF cap to ground to filter noise; do not leave MCLR floating.
The 18-SOIC wide-body package has 1.27 mm pitch. Route all I/O traces on inner layers to keep the top layer free for the SOIC pad and decoupling caps. Place the XT-mode 4 MHz crystal within 5 mm of pins 15-16 (OSC1/OSC2) with grounded guard traces around the crystal body to reduce EMI. The MCLR pull-up and decoupling cap should sit on the same side of the package as their pins. Avoid routing high-frequency traces (relay coils, triac outputs) directly under the SOIC body or under the crystal - this couples switching noise into the oscillator.
Three common pitfalls when designing with PIC16C56T-XTI/SO: (1) The OTP memory cannot be rewritten - a single programming error bricks the device. Always program and verify on a programmer before final PCB solder, or use the PIC16C56/JW windowed ceramic sample for firmware development; (2) The PIC16C5X instruction set differs from the PIC16F1xxx flash family - firmware is not directly portable; configuration bits (oscillator, WDT, code protect) must be explicitly set in the source code; (3) I/O port A pins default to analog input mode on reset - clear the ADCON register if you intend to use them as digital I/O. Failure to do so yields high-impedance inputs that read as random values.
The PIC16C56T-XTI/SO has no internal Schmitt triggers on port B - external slow edges can cause metastability on INT or button inputs. Add a 100 ns RC filter or an external Schmitt trigger (e.g., 74HC14) on any input trace longer than 50 mm. The MCLR input is sensitive to voltage transients below 0.2 Vdd; in noisy motor-drive environments add a 100 nF cap directly to the MCLR pin and a series resistor (1 kohm) for additional protection. The OSC1 input has roughly 5 pF of parasitic capacitance - keep the load capacitors matched within 10%.
Thông tin tuân thủ
The PIC16C56T-XTI/SO pre-dates widespread RoHS adoption; obsolete parts often ship from pre-RoHS stock. AEC-Q100 qualification not applicable - PIC16C5X family was never qualified for automotive safety applications. Request a RoHS-compliant variant explicitly when ordering if your end product must satisfy RoHS/REACH directives.