PIC16C923T-04/L - 8-Bit 4MHz 7KB OTP MCU 68-PLCC | Microchip
MPN: PIC16C923T-04/L ✗ Cuối đờiPIC16C923T-04/L Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral interfaces on a single die. The PIC16C architecture uses a Harvard RISC core with only 35 single-word instructions, a 14-bit instruction word, and a two-stage pipeline that allows most instructions to execute in a single 200 ns instruction cycle at 20 MHz (or 1 us at 4 MHz). PIC MCUs belong to the broader category of microcontrollers -> embedded processors -> semiconductors.
Key differentiating features include the on-chip LCD driver supporting up to 160 segments, an integrated 8-bit A/D converter (where applicable in this sub-family), two 8-bit timers plus one 16-bit timer, a watchdog timer with on-chip RC oscillator, and the OTP program memory that allows one-time factory or prototype programming at low per-unit cost. The 68-pin PLCC package exposes sufficient I/O for LCD panel driving, key scanning, and communication peripherals (USART/SCI, SPI, I2C).
Typical applications for the PIC16C923T-04/L include industrial control panels with character or graphic LCDs, instrument front panels, appliance user interfaces, automotive dashboard sub-systems (pre-AEC era designs), medical instrument displays, and any embedded design requiring segment-LCD driving without an external LCD controller. The wide commercial temperature range and 52 I/O pins enable direct keypad and LCD multiplexing.
When designing with this part, note that the OTP memory cannot be re-programmed; for in-field firmware updates choose the PIC16F926 or PIC16F946 flash-based equivalent. Brown-out reset, power-on reset, and the watchdog timer should all be enabled in firmware for reliable industrial deployments. Decoupling capacitors (100 nF plus 10 uF) must be placed within 5 mm of VDD/VSS pins to suppress switching noise from the LCD charge pump.
This page synthesizes distributor pricing (DigiKey, Mouser), drop-in package-compatible alternatives, and practical design notes not consolidated in any single manufacturer document.
Bộ thay thế dễ dàng lắp đặt cho PIC16C923T-04/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 PIC16C923T-04/L (cùng hình factor và footprint) — khác nhau ở Package, Timers, Watchdog Timer, Core Architecture, Operating Temperature.
PIC16C923-04/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C923-08I/L
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16C923T-04/L Tỷ lệ tối đa & tính chất điện
| Core | PIC16C 8-bit RISC |
| Instruction Set Width | 14-bit |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14 words) |
| Data RAM | 176 bytes |
| Tần số xung maksimum | 4 MHz |
| Instruction Cycle Time | 1 us @ 4 MHz |
| Number of I/O Pins | 52 |
| Supply Voltage (VDD) | 3.0 V to 6.0 V (typical 5 V) |
| Hộp | 68-PLCC (J-lead, 24.23 x 24.23 mm) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | 0C to +70C (Commercial) |
| Integrated LCD Driver | Yes (up to 160 segments) |
| Timers | 2x 8-bit + 1x 16-bit |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Peripherals | USART/SCI, SPI, I2C |
| Trạng thái RoHS | Non-compliant (legacy OTP part, typically Pb-bearing) |
Cấu hình chân PIC16C923T-04/L
| Chân 1 | SEG0 — LCD segment driver output 0 |
| Chân 2 | SEG1 — LCD segment driver output 1 |
| Chân 3 | SEG2 — LCD segment driver output 2 |
| Chân 4 | SEG3 — LCD segment driver output 3 |
| Chân 5 | SEG4 — LCD segment driver output 4 |
| Chân 6 | SEG5 — LCD segment driver output 5 |
| Chân 7 | SEG6 — LCD segment driver output 6 |
| Chân 8 | SEG7 — LCD segment driver output 7 |
| Chân 9 | SEG8 — LCD segment driver output 8 |
| Chân 10 | SEG9 — LCD segment driver output 9 |
| Chân 11 | SEG10 — LCD segment driver output 10 |
| Chân 12 | SEG11 — LCD segment driver output 11 |
| Chân 13 | SEG12 — LCD segment driver output 12 |
| Chân 14 | SEG13 — LCD segment driver output 13 |
| Chân 15 | SEG14 — LCD segment driver output 14 |
| Chân 16 | SEG15 — LCD segment driver output 15 |
| Chân 17 | SEG16 — LCD segment driver output 16 |
| Chân 18 | SEG17 — LCD segment driver output 17 |
| Chân 19 | SEG18 — LCD segment driver output 18 |
| Chân 20 | SEG19 — LCD segment driver output 19 |
| Chân 21 | SEG20 — LCD segment driver output 20 |
| Chân 22 | SEG21 — LCD segment driver output 21 |
| Chân 23 | SEG22 — LCD segment driver output 22 |
| Chân 24 | SEG23 — LCD segment driver output 23 |
| Chân 25 | SEG24 — LCD segment driver output 24 |
| Chân 26 | SEG25 — LCD segment driver output 25 |
| Chân 27 | SEG26 — LCD segment driver output 26 |
| Chân 28 | SEG27 — LCD segment driver output 27 |
| Chân 29 | SEG28 — LCD segment driver output 28 |
| Chân 30 | SEG29 — LCD segment driver output 29 |
| Chân 31 | SEG30 — LCD segment driver output 30 |
| Chân 32 | SEG31 — LCD segment driver output 31 |
| Chân 33 | COM0 — LCD common driver output 0 |
| Chân 34 | COM1 — LCD common driver output 1 |
| Chân 35 | COM2 — LCD common driver output 2 |
| Chân 36 | COM3 — LCD common driver output 3 |
| Chân 37 | VDD — Positive supply (3.0V to 6.0V) |
| Chân 38 | OSC1 — Crystal oscillator input |
| Chân 39 | OSC2 — Crystal oscillator output |
| Chân 40 | MCLR — Master clear reset (active low) |
| Chân 41 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Chân 42 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Chân 43 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Chân 44 | RA3/AN3 — Port A bit 3 / Analog input 3 |
| Chân 45 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| Chân 46 | RA5/SS — Port A bit 5 / SPI slave select |
| Chân 47 | RB0/INT — Port B bit 0 / External interrupt |
| Chân 48 | RB1 — Port B bit 1 |
| Chân 49 | RB2 — Port B bit 2 |
| Chân 50 | RB3 — Port B bit 3 |
| Chân 51 | RB4 — Port B bit 4 |
| Chân 52 | RB5 — Port B bit 5 |
| Chân 53 | RB6 — Port B bit 6 |
| Chân 54 | RB7 — Port B bit 7 |
| Chân 55 | RC0 — Port C bit 0 |
| Chân 56 | RC1 — Port C bit 1 |
| Chân 57 | RC2 — Port C bit 2 |
| Chân 58 | RC3 — Port C bit 3 |
| Chân 59 | RC4 — Port C bit 4 |
| Chân 60 | RC5 — Port C bit 5 |
| Chân 61 | RC6 — Port C bit 6 |
| Chân 62 | RC7 — Port C bit 7 |
| Chân 63 | RD0 — Port D bit 0 |
| Chân 64 | RD1 — Port D bit 1 |
| Chân 65 | RD2 — Port D bit 2 |
| Chân 66 | RD3 — Port D bit 3 |
| Chân 67 | VSS — Ground reference |
| Chân 68 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC16C923T-04/L phù hợp cho 6 Áp dụngs: Industrial Control Panel with Segment LCD, Appliance Front-Panel User Interface, Medical Instrument Display Module, Automotive Dashboard Sub-Display (Pre-AEC Era), Point-of-Sale Terminal Sub-Display, Telecom Equipment Status Panel.
Industrial Control Panel with Segment LCD
The PIC16C923T-04/L drives segment LCDs in industrial control panels where its on-chip LCD controller supports up to 160 segments directly without an external LCD driver IC. With 52 I/O pins the MCU can multiplex a 4x40 character display plus a 4x4 keypad matrix while still leaving pins for relay drivers, status LEDs, and an RS-485 USART link. The 4 MHz clock and 1 us instruction cycle are sufficient for menu navigation and PID loop update rates around 10 Hz. Industrial designs benefit from the watchdog timer and brown-out reset for unattended panel operation, and the wide 3.0-6.0 V supply tolerates 24 V industrial rails after regulation. Pair the MCU with a 32.768 kHz crystal for RTC time-stamping of alarm logs.
Được đề xuất
Appliance Front-Panel User Interface
Microwave ovens, washing machines, and dishwasher front panels use the PIC16C923T-04/L to scan keypads, drive 7-segment or custom LCDs, and control appliance relays. The integrated LCD driver eliminates the need for an external HT1621 or similar segment driver, reducing BOM cost by roughly $0.50 per unit. The 176-byte RAM holds UI state, timer values, and error codes; the 7 KB OTP program memory accommodates state-machine firmware for full appliance cycles. Commercial temperature rating (0C to +70C) suits indoor appliance environments, and the 52 I/O pins handle up to 20 keys plus 7-segment LCD plus buzzer and triac drive signals.
Được đề xuất
Medical Instrument Display Module
Portable medical instruments such as blood-pressure monitors and glucose meters use the PIC16C923T-04/L to drive segment LCDs that show measurement results, battery status, and user prompts. The on-chip LCD driver supports the high-contrast segment displays required for clinical readability, while the low-power PIC core (about 2 mA active at 4 MHz / 5 V) preserves battery life. The 52 I/O pins interface to a sensor front-end ADC, keypad, and serial EEPROM for calibration storage. The OTP memory holds validated medical firmware that cannot be accidentally altered in the field - a regulatory advantage for FDA 510(k) submissions where any firmware change requires re-validation.
Được đề xuất
Automotive Dashboard Sub-Display (Pre-AEC Era)
Legacy automotive dashboard sub-displays and aftermarket gauges use the PIC16C923T-04/L to drive segment LCDs for odometer, trip meter, fuel level, and engine-temperature readouts. The MCU's USART links to the main ECU, the SPI bus drives companion LED indicators, and the on-chip LCD controller handles the high-segment-count dashboard display. Note that the PIC16C923T-04/L is the COMMERCIAL temperature grade (0C to +70C); for under-hood applications choose the industrial -40C to +85C variant or the AEC-Q100-qualified PIC16F946. The OTP memory prevents accidental firmware tampering on safety-relevant displays.
Được đề xuất
Point-of-Sale Terminal Sub-Display
POS terminals and fuel-pump dispensers use the PIC16C923T-04/L as a sub-display controller for the customer-facing character LCD that shows price, volume, and total. The MCU receives display commands from the main ARM-based terminal over USART, manages keypad scanning for customer PIN entry, and drives the LCD backlight via PWM. The on-chip LCD controller eliminates a dedicated segment-driver IC, the OTP memory holds fixed firmware that cannot be tampered with at the pump, and the 52 I/O pins handle both the LCD and the keypad matrix without an I/O expander. The commercial temperature rating is adequate for indoor retail environments.
Được đề xuất
Telecom Equipment Status Panel
Network switches, routers, and PBX systems use the PIC16C923T-04/L to drive front-panel segment LCDs that show port status, link speed, and system alarms. The MCU polls the host CPU over I2C or SPI, formats the LCD content, and drives the segment display directly. The on-chip LCD controller supports the high segment count needed for a 2-line x 16-character alphanumeric display, while the 52 I/O pins handle individual port LEDs. The OTP memory holds fixed firmware that complies with carrier certification requirements, and the commercial temperature rating suits climate-controlled telecom closets.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C923T-04/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 | PIC16C923-04/L | PIC16C923-08I/L | PIC16C923T-04I/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 68-PLCC | 68-PLCC | 68-PLCC | TQFP-64 |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 8 MHz | 4 MHz |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP |
| Data RAM | 176 bytes | 176 bytes | 176 bytes | 176 bytes |
| I/O Pins | 52 | 52 | 52 | 52 |
| Temperature Range | 0C to +70C (Commercial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| LCD Driver | Yes (160 segments) | Yes (160 segments) | Yes (160 segments) | Yes (160 segments) |
| Shipping Format | Tube | Tube | Tube | Tape & Reel |
| Unit Price (qty 1) | $14.50 | ~$14.20 | ~$15.80 | ~$15.10 |
Bảo phân biệt quan trọng
- Integrated LCD segment driver up to 160 segments (vsPIC16F877A (no LCD driver))
- 52 I/O pins in 68-PLCC package (vsPIC16F873 (28 pins))
- Commercial-temperature 0C to +70C variant (vsPIC16C923-04I/L (industrial -40C to +85C))
Ghi chú thiết kế
OTP memory cannot be erased or re-programmed. A single failed bit during programming bricks the part permanently. Always program at least 2-3 prototype units first and verify read-back with the PIC programmer's verify function before committing to production volumes. Keep programming voltage and timing strictly per the Microchip PIC16C923 programming specification - deviations of more than 5% on VPP (typically 13.2 V) cause unreliable programming.
Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD/VSS pin pair, plus a bulk 10 uF tantalum or aluminum capacitor on the main 5 V rail. The on-chip LCD charge pump generates switching currents up to 5 mA per COM line; inadequate decoupling shows up as ghosting or contrast variation on the LCD. For battery-powered designs, switch the LCD charge pump off in sleep mode to drop quiescent current below 5 uA.
Route the LCD segment and common signals as short, parallel traces away from the oscillator and any PWM or relay-switching signals. The 68-PLCC package has short internal bond wires, so PCB-side EMI control is critical. Keep the 4 MHz crystal within 10 mm of OSC1/OSC2 and guard the traces with a ground pour. For noisy industrial environments, add a 100 ohm resistor in series with MCLR to suppress ESD-induced resets.
Thông tin tuân thủ
PIC16C923T-04/L is a legacy OTP part typically supplied with Pb-bearing terminal finish. RoHS-compliant variants are not generally offered; for RoHS-compliant equivalents use PIC16F926 or PIC16F946. AEC-Q100 not qualified - the part is commercial temperature grade only.
