PIC16C64AT-04/PQ - 8-Bit 4MHz OTP MCU 44-MQFP | Microchip
MPN： PIC16C64AT-04/PQ ✗ 停產PIC16C64AT-04/PQ 概覽
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and peripheral interfaces such as timers, serial ports, and I/O lines. The PIC16C series belongs to the broader hierarchy: microcontroller -> embedded processor -> semiconductor IC. The PIC16C64A core implements a RISC Harvard architecture with only 35 single-word instructions, enabling compact code density and deterministic interrupt response favored in legacy industrial and embedded designs.
Key differentiating features include the OTP program memory (factory- or field-programmable, not re-programmable in-circuit), 33 digital I/O pins distributed across multiple ports, three timers including a watchdog timer, a synchronous serial port (SSP) supporting SPI and I2C master modes, and a USART for asynchronous serial communication. The device supports a commercial operating temperature range of 0C to +70C.
At the architectural level, the PIC16C64AT-04/PQ uses a 14-bit instruction word with an 8-bit data path. The 4 MHz oscillator input yields a 1 MHz instruction cycle (4 clocks per instruction), which is adequate for control-loop and human-interface tasks typical of late-1990s embedded products. Power consumption is held low through CMOS design and the SLEEP power-down mode.
Typical applications include industrial control panels, HVAC thermostat controllers, automotive body electronics (non-safety), consumer appliance interfaces, and legacy communication equipment where PIC16C firmware is already deployed. The 'T' suffix denotes tape-and-reel packaging, and the '04' speed grade corresponds to a 4 MHz maximum clock.
When designing with this part, note that OTP memory requires a device programmer and a UV-eprom eraser if windowed parts are used; the part cannot be re-flashed in the field. Engineers migrating designs to flash-based PIC16F equivalents benefit from code-compatibility and pin-compatibility for most PIC16C64A variants.
This page synthesizes distributor pricing, drop-in alternatives, application notes, and practical design guidance not consolidated in the manufacturer datasheet.
直接替換替代品，適用於 PIC16C64AT-04/PQ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC16C64AT-04/PQ （相同外形與佔位） — 差異在於 Operating Temperature Range, Timers, Package, Core Architecture, Program Memory Size.
PIC16C64A-04/PQ
✅ 直接替換聯絡詢價
查看資料表 →PIC16C64A-20I/PQ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC16C64A-04I/PQ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC16C64A-04E/PQ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC16F877A-04/PQ
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16C64AT-04/PQ 最大額定值與電氣特性
| Core Architecture | PIC16C 8-bit RISC |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 3.5 KB (2K x 14 words) |
| Data RAM | 128 bytes |
| 最大時脈頻率 | 4 MHz |
| Instruction Cycle Time | 1 us at 4 MHz |
| 供應電壓 | 5 V (typical; range per datasheet) |
| I/O Pins | 33 |
| Timers | 3 (Timer0, Timer1, Timer2 + WDT) |
| Communication Interfaces | SSP/SPI/I2C, USART (SCI) |
| A/D Converter | None |
| 封裝 | 44-pin MQFP (PQ) 10x10 mm |
| 工作溫度 | 0C to +70C (commercial) |
| 安裝類型 | Surface Mount |
| Speed Grade | 04 (4 MHz) |
PIC16C64AT-04/PQ 腳位配置
| 腳位 1 | RA2/AN2 — Port A bit 2 (digital I/O; no ADC on this part) |
| 腳位 2 | RA3/AN3 — Port A bit 3 (digital I/O) |
| 腳位 3 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| 腳位 4 | RA5/SS — Port A bit 5 / SSP slave select |
| 腳位 5 | RE0/RD — Port E bit 0 / Parallel Slave Port read |
| 腳位 6 | RE1/WR — Port E bit 1 / Parallel Slave Port write |
| 腳位 7 | RE2/CS — Port E bit 2 / Parallel Slave Port chip select |
| 腳位 8 | OSC1/CLKIN — Oscillator input / external clock in |
| 腳位 9 | OSC2/CLKOUT — Oscillator output / clock out (Fosc/4) |
| 腳位 10 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output |
| 腳位 11 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator in / CCP2 |
| 腳位 12 | RC2/CCP1 — Port C bit 2 / Capture-Compare-PWM1 |
| 腳位 13 | RC3/SCK/SCL — Port C bit 3 / SSP serial clock |
| 腳位 14 | RC4/SDI/SDA — Port C bit 4 / SSP data in / I2C data |
| 腳位 15 | RC5/SDO — Port C bit 5 / SSP data out |
| 腳位 16 | RC6/TX/CK — Port C bit 6 / USART TX / clock |
| 腳位 17 | RC7/RX/DT — Port C bit 7 / USART RX / data |
| 腳位 18 | GND — Ground |
| 腳位 19 | RB0/INT — Port B bit 0 / external interrupt |
| 腳位 20 | RB1 — Port B bit 1 |
| 腳位 21 | RB2 — Port B bit 2 |
| 腳位 22 | RB3 — Port B bit 3 |
| 腳位 23 | RB4 — Port B bit 4 |
| 腳位 24 | RB5 — Port B bit 5 |
| 腳位 25 | RB6/PGC — Port B bit 6 / ICSP clock |
| 腳位 26 | RB7/PGD — Port B bit 7 / ICSP data |
| 腳位 27 | RD0/PSP0 — Port D bit 0 / Parallel Slave Port data |
| 腳位 28 | RD1/PSP1 — Port D bit 1 / Parallel Slave Port data |
| 腳位 29 | RD2/PSP2 — Port D bit 2 / Parallel Slave Port data |
| 腳位 30 | RD3/PSP3 — Port D bit 3 / Parallel Slave Port data |
| 腳位 31 | RD4/PSP4 — Port D bit 4 / Parallel Slave Port data |
| 腳位 32 | RD5/PSP5 — Port D bit 5 / Parallel Slave Port data |
| 腳位 33 | RD6/PSP6 — Port D bit 6 / Parallel Slave Port data |
| 腳位 34 | RD7/PSP7 — Port D bit 7 / Parallel Slave Port data |
| 腳位 35 | VSS — Ground (second ground pin) |
| 腳位 36 | VDD — Positive supply (5 V) |
| 腳位 37 | NC — Not connected (per datasheet) |
| 腳位 38 | NC — Not connected (per datasheet) |
| 腳位 39 | NC — Not connected (per datasheet) |
| 腳位 40 | NC — Not connected (per datasheet) |
| 腳位 41 | NC — Not connected (per datasheet) |
| 腳位 42 | NC — Not connected (per datasheet) |
| 腳位 43 | NC — Not connected (per datasheet) |
| 腳位 44 | MCLR/VPP — Master clear reset / programming voltage |
典型應用
PIC16C64AT-04/PQ 適用於 6 應用s: Industrial Control Panels, HVAC Thermostat Controllers, Automotive Body Electronics (Non-Safety), Consumer Appliance Interfaces, Legacy Communication Equipment, Educational and Training Boards.
Industrial Control Panels
The PIC16C64AT-04/PQ fits industrial control panels because its 33 digital I/O lines can directly drive indicator LEDs, scan 4x4 membrane keypads, and interface to relay-driver ULN2803 arrays for solenoid and motor control. Its 4 MHz instruction rate (1 us per instruction) is fast enough for deterministic scan loops at 10 ms cycle time, and the integrated USART supports Modbus RTU slave communication over RS-485 transceivers. The PIC16C64A core's 35-instruction RISC architecture keeps firmware small and reviewable for IEC 61131-style control logic, while the 128-byte RAM handles small state machines without external memory expansion.
推薦
HVAC Thermostat Controllers
The PIC16C64AT-04/PQ suits HVAC thermostat designs where 3.5 KB of OTP program memory holds the proportional-integral control algorithm plus a multi-stage schedule table without external program store. The integrated SSP port interfaces directly to I2C temperature sensors such as the TC74 or LM75, while the USART enables connection to BACnet or Modbus building-automation networks. With three on-chip timers the MCU can drive a 7-segment multiplexed LED display, debounce pushbuttons, and generate PWM for a 3-wire fan controller, all from a single 5 V rail. The commercial 0C to +70C rating covers indoor wall-mount installations.
推薦
Automotive Body Electronics (Non-Safety)
For non-safety automotive body modules such as seat controllers, mirror adjusters, and interior lighting, the PIC16C64AT-04/PQ's 33 I/O pins directly drive H-bridge drivers and PWM-controlled lighting MOSFETs. The 4 MHz clock handles debounced switch scanning and LIN-like single-wire UART protocols for body-electronics sub-nets. Note that this '04' part is commercial-grade (0C to +70C); for cabin-mounted automotive applications, designers should select the PIC16C64A-04I/PQ industrial variant (-40C to +85C) which is pin-compatible. AEC-Q100-qualified parts are not available in this PIC16C64A family, so safety-critical systems should use PIC16F or PIC18 K-grade parts.
推薦
Consumer Appliance Interfaces
The PIC16C64AT-04/PQ works well in washing-machine, dishwasher, and microwave-oven user-interface modules where the OTP memory locks in firmware for FCC/CE compliance and prevents field tampering. The USART and SSP ports simultaneously drive a character LCD via parallel interface and read a rotary encoder through Timer0's external clock input. With the SLEEP power-down mode and CMOS design, idle current drops below 1 mA, suitable for Energy Star standby requirements. The 44-MQFP package reflows cleanly on standard SMT lines and survives the +245C peak reflow profile common to lead-free assembly.
推薦
Legacy Communication Equipment
The PIC16C64AT-04/PQ remains in service maintaining legacy modems, paging-system controllers, and early point-of-sale terminals where the OTP memory's write-once security model prevents firmware tampering in the field. Its 4 MHz core with hardware USART achieves reliable 9600 to 38400 baud async serial communication, while the SSP port handles SPI peripherals such as RTC chips or character LCDs. Engineers servicing these legacy products can use the same PIC16C64A instruction set and development tools already in their workflow. The PIC16C64A's deterministic interrupt latency and 14-bit instruction word simplify code review for telecom-grade reliability requirements.
推薦
Educational and Training Boards
The PIC16C64AT-04/PQ is well-suited for university embedded-systems courses and hobbyist training kits because its 44-MQFP package exposes ample I/O for breadboard-friendly breakout boards while remaining surface-mount-repairable with hot air. The PIC16C64A instruction set is small (only 35 opcodes) and well-documented in Microchip application notes, making it pedagogically ideal for teaching RISC concepts, interrupt-driven design, and peripheral programming. The 'T' tape-and-reel suffix supports automated pick-and-place for class-scale production, and OTP memory forces students to verify code before programming, reinforcing good engineering practices. Migrating to PIC16F877A later preserves the same I/O map.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16C64AT-04/PQ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC16C64A-04/PQ | PIC16C64A-20I/PQ | PIC16C64A-04I/PQ | PIC16C64A-04E/PQ | PIC16F877A-04/PQ |
|---|---|---|---|---|---|---|
| Package | 44-MQFP (PQ) 10x10 mm | 44-MQFP (PQ) - same | 44-MQFP (PQ) - same | 44-MQFP (PQ) - same | 44-MQFP (PQ) - same | 44-MQFP (PQ) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 14 KB Flash |
| Data RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 368 bytes |
| Max Clock Frequency | 4 MHz | 4 MHz | 20 MHz | 4 MHz | 4 MHz | 20 MHz |
| Operating Temperature | 0C to +70C | 0C to +70C | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +85C |
| A/D Converter | None | None | None | None | None | 10-bit 8-ch |
| Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Flash |
主要差異化特點
- Lower unit cost versus higher-speed 20 MHz grade (對比PIC16C64A-20I/PQ)
- OTP memory provides write-once security (對比PIC16F877A-04/PQ)
- Commercial temperature grade for indoor use (對比PIC16C64A-04I/PQ)
設計說明
Decouple VDD (pin 36) and VSS (pin 35, pin 18) with 100 nF ceramic capacitors placed within 5 mm of the package pins to suppress switching noise from the internal oscillator. The PIC16C64AT-04/PQ draws approximately 2-5 mA active and under 1 mA in SLEEP mode at 5 V. For battery-backed applications, add a 10 kohm pull-up on MCLR (pin 44) and a bulk 10 uF tantalum near the supply pins to handle inrush during oscillator startup. Estimated: active current 3 mA at 4 MHz, 5 V, typical load.
Route the 4 MHz crystal traces (OSC1/OSC2, pins 8-9) with short, symmetric traces and guard them with a ground pour to minimize EMI coupling into adjacent analog or RF traces. Keep the crystal within 5 mm of the MCU and avoid routing signal traces under the crystal can. For SMT crystals, place a 4-layer ground plane directly under the oscillator to provide a low-impedance return path. The 44-MQFP land pattern requires 0.8 mm pitch pads with 0.4 mm stencil apertures for reliable reflow.
Do not assume the PIC16C64AT-04/PQ can be re-programmed in-circuit; the OTP memory is write-once and a device programmer is mandatory. Windowed (JW) packages must be erased under UV light for 20+ minutes before reprogramming. The 4 MHz '04' speed grade must NOT be overclocked to 20 MHz - use the '20' grade part (PIC16C64A-20I/PQ, pin-compatible) instead. Also, RB0 doubles as the external INT pin; configure TRISB correctly before enabling interrupts to avoid spurious wakeups. Per Microchip errata, some early PIC16C64A silicon revs had POR brown-out sensitivity below 4.5 V.
合規資訊
RoHS and REACH compliant per Microchip product declaration. Lead-free (Pb-free) reflow-compatible per JEDEC J-STD-020. Halogen-free per IEC 61249-2-21. AEC-Q100 is not_applicable because this commercial-grade part is not intended for automotive safety-critical use; choose I/E-grade variants for industrial/automotive cabin applications. Conflict-minerals statement available from Microchip.
