PIC16C923-08I/L - 8-Bit CMOS MCU with LCD Driver, 7KB OTP, 68-LCC | Microchip
MPN: PIC16C923-08I/L ✗ Cuối đờiPIC16C923-08I/L Tóm tắt
A microcontroller is a single-chip computer that integrates a CPU, memory, and peripheral I/O on one die; an 8-bit MCU like the PIC16C923 is the workhorse class for industrial control, instrumentation, and appliance front-panel human-machine interfaces. The PIC16C923 sits within the Microchip PIC16C family (legacy CMOS/OTP generation) under the broader hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> RISC MCU -> CMOS OTP MCU -> PIC architecture. This categorization matters for engineers selecting for long-life-cycle industrial panels where LCD plus button input plus a few relays are the I/O mix.
Key features of the PIC16C923 include a hardware LCD driver module capable of driving up to 32 segments x 4 commons (128 pixel control) without external LCD bias circuitry, an 8-bit timer/counter with optional 8-bit prescaler, a Watchdog Timer with its own on-chip RC oscillator for reliable reset, a programmable code-protection bit, and In-Circuit Serial Programming (ICSP) capability. The integrated LCD controller is the headline differentiator versus general-purpose 8-bit MCUs - it saves the BOM cost of an external LCD driver chip and the firmware overhead of bit-banging segment waveforms.
The PIC16C923-08I/L variant operates from 5V (4.5V to 5.5V) with an 8 MHz oscillator (suffix -08) in industrial temperature grade (suffix I). The 'L' suffix denotes the 68-lead PLCC (also called LCC or QCCJ) square J-leaded ceramic-compatible package. Because OTP memory cannot be reprogrammed, this part is intended for production volumes rather than prototyping - for development, Microchip recommends the windowed CERDIP -JW variant.
Typical applications include industrial control panels with LCD readouts, HVAC thermostats, weigh scales, blood-pressure monitors and other medical front-panel displays, washing machine and appliance user interfaces, gas pumps and metering equipment, and remote-control keypads with segment displays. The integrated LCD segment driver plus abundant GPIO makes the part a strong fit when the BOM must stay under a tight ceiling.
When designing with PIC16C923, plan the OTP programming step into your manufacturing flow - the parts cannot be reprogrammed in the field, so the firmware image must be locked before the chip is soldered. Also note that the 68-pin PLCC package requires a socketed or careful-reflow PCB land pattern; consider PIC16F946 or PIC16F914 in TQFP/PT packages if you need Flash-based reprogrammability and modern footprints.
This page synthesizes distributor pricing, current Microchip cross-reference data, and engineering design notes for the PIC16C923-08I/L - information typically scattered across Octopart, DigiKey, and Microchip's parametric search, consolidated into a single decision-ready reference.
Bộ thay thế dễ dàng lắp đặt cho PIC16C923-08I/L — 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 PIC16C923-08I/L (cùng hình factor và footprint) — khác nhau ở Timers, LCD Driver, Package, Operating Temperature, Watchdog Timer.
PIC16C923-04I/L
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Xem tài liệu →PIC16C923-08I/L Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit RISC |
| Instruction Set Width | 14-bit |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14) |
| Data RAM | 176 bytes |
| General Purpose Registers | 8 |
| Number of Instructions | 35 single-word |
| Instruction Execution Time | 500 ns at 8 MHz |
| Operating Frequency | 8 MHz (suffix -08) |
| I/O Pins | 52 |
| LCD Driver | Up to 32 segments x 4 commons (integrated) |
| Timers | 8-bit Timer/Counter0 with 8-bit prescaler |
| Watchdog Timer | Yes, with dedicated on-chip RC oscillator |
| In-Circuit Serial Programming | ICSP supported |
| Code Protection | Programmable code-protect bit |
| Điện áp cung cấp | 4.5 V to 5.5 V (5 V nominal) |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial grade) |
| Hộp | 68-pin PLCC / LCC (J-Lead, code QCCJ) |
| Kiểu lắp đặt | Surface Mount (PLCC socket compatible) |
| Lead-Free / RoHS | Refer to Microchip product page (legacy OTP line; non-RoHS variants exist) |
Cấu hình chân PIC16C923-08I/L
| Chân 1 | SEG0 — LCD segment output 0 |
| Chân 2 | SEG1 — LCD segment output 1 |
| Chân 3 | SEG2 — LCD segment output 2 |
| Chân 4 | SEG3 — LCD segment output 3 |
| Chân 5 | SEG4 — LCD segment output 4 |
| Chân 6 | SEG5 — LCD segment output 5 |
| Chân 7 | SEG6 — LCD segment output 6 |
| Chân 8 | SEG7 — LCD segment output 7 |
| Chân 9 | SEG8 — LCD segment output 8 |
| Chân 10 | SEG9 — LCD segment output 9 |
| Chân 11 | SEG10 — LCD segment output 10 |
| Chân 12 | VDD — Positive supply (5 V nominal) |
| Chân 13 | VSS — Ground reference |
| Chân 14 | OSC1 — Crystal oscillator input |
| Chân 15 | OSC2 — Crystal oscillator output |
| Chân 16 | RC0 — PORTC digital I/O 0 |
| Chân 17 | RC1 — PORTC digital I/O 1 |
| Chân 18 | RC2 — PORTC digital I/O 2 |
| Chân 19 | RC3 — PORTC digital I/O 3 |
| Chân 20 | RD0 — PORTD digital I/O 0 |
| Chân 21 | RD1 — PORTD digital I/O 1 |
| Chân 22 | RD2 — PORTD digital I/O 2 |
| Chân 23 | RD3 — PORTD digital I/O 3 |
| Chân 24 | RD4 — PORTD digital I/O 4 |
| Chân 25 | RD5 — PORTD digital I/O 5 |
| Chân 26 | RD6 — PORTD digital I/O 6 |
| Chân 27 | RD7 — PORTD digital I/O 7 |
| Chân 28 | VSS — Ground reference |
| Chân 29 | VDD — Positive supply (5 V nominal) |
| Chân 30 | RB0 — PORTB digital I/O 0 / INT |
| Chân 31 | RB1 — PORTB digital I/O 1 |
| Chân 32 | RB2 — PORTB digital I/O 2 |
| Chân 33 | RB3 — PORTB digital I/O 3 |
| Chân 34 | RB4 — PORTB digital I/O 4 |
| Chân 35 | RB5 — PORTB digital I/O 5 |
| Chân 36 | RB6 — PORTB digital I/O 6 / ICSP clock |
| Chân 37 | RB7 — PORTB digital I/O 7 / ICSP data |
| Chân 38 | COM0 — LCD common output 0 (backplane) |
| Chân 39 | COM1 — LCD common output 1 |
| Chân 40 | COM2 — LCD common output 2 |
| Chân 41 | COM3 — LCD common output 3 |
| Chân 42 | SEG11 — LCD segment output 11 |
| Chân 43 | SEG12 — LCD segment output 12 |
| Chân 44 | SEG13 — LCD segment output 13 |
| Chân 45 | SEG14 — LCD segment output 14 |
| Chân 46 | SEG15 — LCD segment output 15 |
| Chân 47 | SEG16 — LCD segment output 16 |
| Chân 48 | SEG17 — LCD segment output 17 |
| Chân 49 | SEG18 — LCD segment output 18 |
| Chân 50 | SEG19 — LCD segment output 19 |
| Chân 51 | SEG20 — LCD segment output 20 |
| Chân 52 | SEG21 — LCD segment output 21 |
| Chân 53 | SEG22 — LCD segment output 22 |
| Chân 54 | SEG23 — LCD segment output 23 |
| Chân 55 | SEG24 — LCD segment output 24 |
| Chân 56 | SEG25 — LCD segment output 25 |
| Chân 57 | SEG26 — LCD segment output 26 |
| Chân 58 | SEG27 — LCD segment output 27 |
| Chân 59 | SEG28 — LCD segment output 28 |
| Chân 60 | SEG29 — LCD segment output 29 |
| Chân 61 | SEG30 — LCD segment output 30 |
| Chân 62 | SEG31 — LCD segment output 31 |
| Chân 63 | RA0 — PORTA digital I/O 0 / AN0 |
| Chân 64 | RA1 — PORTA digital I/O 1 / AN1 |
| Chân 65 | RA2 — PORTA digital I/O 2 / AN2 |
| Chân 66 | RA3 — PORTA digital I/O 3 / AN3 / VREF+ |
| Chân 67 | RA4 — PORTA digital I/O 4 / T0CKI |
| Chân 68 | MCLR — Master clear reset (active low) |
Ứng dụng tiêu biểu
PIC16C923-08I/L phù hợp cho 7 Áp dụngs: Industrial Control Panel with LCD Readout, HVAC Thermostat with Segment LCD, Weigh Scale with Multi-Segment LCD, Blood Pressure Monitor Front Panel, Washing Machine User Interface, Gas Pump / Metering Equipment, Remote Control Keypad with Segment Display.
Industrial Control Panel with LCD Readout
The PIC16C923-08I/L's integrated 32-segment x 4-common LCD driver and 52 GPIO pins are ideal for industrial control panels driving multi-digit numeric displays plus status icons and switch inputs. At 8 MHz, the 500 ns instruction cycle handles 10 Hz keypad scanning and segment refresh with headroom for menu logic; the Watchdog Timer with its own RC oscillator protects against firmware lockup in factory environments. Typical reference designs use PIC16C923 + a 5 V LDO + a PLCC socket + a 32-segment custom LCD glass.
Được đề xuất
HVAC Thermostat with Segment LCD
The PIC16C923's industrial -40 C to +85 C operating range and integrated LCD driver make it a strong fit for HVAC wall thermostats displaying setpoint, room temperature, fan mode, and schedule on a segment LCD. The device reads a 10K NTC thermistor via the ADC, drives a relay via GPIO for compressor control, and refreshes the 7-segment + icon display through the internal LCD controller without external bias chips. At 5 V/8 MHz, average active current stays under 5 mA with sleep modes for battery-backed thermostats.
Được đề xuất
Weigh Scale with Multi-Segment LCD
The PIC16C923-08I/L drives the multi-digit 7-segment + decimal-point LCD typical of commercial weigh scales, while the 8-bit ADC reads a load-cell bridge through an external instrumentation amp (e.g., MCP6N11). The integrated LCD controller saves BOM cost versus external segment drivers, and the 8 MHz core delivers 500 ns instructions for sub-100 ms scale settling. OTP memory locks calibration constants at production; the Watchdog Timer prevents field lockups on ESD events common in retail environments.
Được đề xuất
Blood Pressure Monitor Front Panel
Front-panel control for blood-pressure monitors uses PIC16C923-08I/L's segment LCD to display systolic, diastolic, pulse rate, and user prompts, while a separate signal-processing chain handles cuff pressure and pulse detection. The 52 GPIO pins accommodate membrane-switch scanning for start/memory/mode keys plus LED indicators for inflation status. Industrial temperature grade ensures reliable operation in clinical settings with stable 5 V supply from a regulated mains adapter.
Được đề xuất
Washing Machine User Interface
The PIC16C923's segment LCD plus 52 GPIO suit washing-machine front-panel control where icons display wash cycle, temperature, spin speed, and remaining time. The MCU interfaces to triac drivers (MOC3021) for motor and heater control via opto-isolated GPIO, and reads rotary encoder + push buttons for user input. OTP memory locks cycle firmware per SKU; the Watchdog Timer plus the wide operating temperature handle appliance laundry-room environments reliably.
Được đề xuất
Gas Pump / Metering Equipment
Fuel dispensers and utility meters use PIC16C923-08I/L to drive multi-segment volume/price displays and accumulate pulse counts from flow sensors. The 8 MHz core handles BCD arithmetic for transaction totals, while the integrated LCD driver eliminates an external segment-driver IC in cost-sensitive forecourt hardware. Industrial temperature grade covers outdoor cabinet exposure; OTP memory locks calibration constants at factory seal for metrology certification.
Được đề xuất
Remote Control Keypad with Segment Display
The PIC16C923-08I/L fits IR/RF remote-control keypads that include a small segment LCD for menu navigation or status icons. The 52 GPIO can scan a 4x5 membrane matrix plus drive the LCD directly; low-power sleep modes via the Watchdog Timer wakeup extend battery life. OTP memory locks OEM key mappings per model variant, preventing field firmware tampering in security-sensitive applications.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C923-08I/L — 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 | PIC16C923-04I/L | PIC16C923-08I/PT |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 68-pin PLCC (L) | 68-pin PLCC (L) - same | TQFP-64 (different) |
| Maximum Clock Frequency | 8 MHz | 4 MHz | 8 MHz |
| Instruction Cycle Time | 500 ns | 1 us | 500 ns |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP |
| Data RAM | 176 bytes | 176 bytes | 176 bytes |
| LCD Driver Segments | 32 seg x 4 com | 32 seg x 4 com | 32 seg x 4 com |
| I/O Pins | 52 | 52 | 52 |
| Temperature Grade | Industrial (-40 C to +85 C) | Industrial (-40 C to +85 C) | Industrial (-40 C to +85 C) |
| Lifecycle Status | Obsolete / NRND | Obsolete / NRND | Obsolete / NRND |
Bảo phân biệt quan trọng
- Integrated LCD segment driver eliminates external LCD bias chip (vsPIC16F84A + external HT1621 LCD controller)
- Industrial temperature grade (-40 C to +85 C) for harsh environments (vsPIC16C923-08 (commercial 0 C to +70 C))
- 8 MHz / 500 ns instruction cycle for real-time control (vsPIC16C923-04I/L (4 MHz / 1 us instruction cycle))
Ghi chú thiết kế
PIC16C923 uses OTP (one-time-programmable) EPROM. Firmware must be programmed BEFORE the part is soldered into the PCB if using a non-ICSP flow, since OTP cannot be erased. For development, order the -JW windowed CERDIP variant (erasable UV EPROM) or use a modern PIC16F946 Flash equivalent with ICSP. Plan OTP programming into your manufacturing flow with a dedicated gang programmer to avoid field failures.
The 68-pin PLCC (L) package uses J-leads on a 1.27 mm pitch and is intended for socketed assembly (e.g., 68-pin PLCC socket) to simplify field replacement and OTP programming workflows. If you must surface-mount, ensure the PCB land pattern matches the J-lead footprint with adequate pad extension for solder fillet formation. For hand prototyping, a PLCC-to-DIP adapter (e.g., SchmartBoard) lets you use the part on a breadboard.
PIC16C923 requires a regulated 4.5 V to 5.5 V supply with bulk decoupling of at least 10 uF tantalum or ceramic + 0.1 uF ceramic close to each VDD/VSS pair (the part has multiple VDD/VSS pins on a 68-pin device). Brown-out detection must be enabled in configuration bits to prevent code execution at low VDD that could corrupt the OTP read; this is a documented Microchip erratum pattern on early PIC16C silicon revisions.
Thông tin tuân thủ
PIC16C923-08I/L is a legacy OTP Microchip part; verify RoHS/lead-free status with Microchip product page or current datasheet for your specific date code. The part is not AEC-Q100 qualified (automotive) - use PIC16F946 automotive variants for AEC-Q100 designs.
