PIC16LF84A-04I/SS - 4MHz 1.75KB Flash 8-bit MCU | Microchip
部品番号: PIC16LF84A-04I/SS ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $2.54 | $2.54 |
| 10 | $2.3 | $23.00 |
| 100 | $1.95 | $195.00 |
| 500 | $1.7 | $850.00 |
| 1,000 | $1.45 | $1,450.00 |
PIC16LF84A-04I/SS 概要
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, on-chip program memory, on-chip data RAM, and a small set of peripheral registers. It belongs to the broader hierarchy of embedded computing devices: microcontroller -> microprocessor with peripherals -> CPU; it sits below 16-bit and 32-bit MCUs in raw throughput but above purely hardware state machines in flexibility. The PIC16F8X family, including the PIC16LF84A, is widely taught in introductory embedded courses because it has only 35 instructions, an 8-level hardware stack, and a Harvard architecture that separates program and data buses.
The LF (low-power) variant operates across 2.0 V to 5.5 V supply and offers brown-out reset, a programmable watchdog timer, an on-chip 8-bit timer/counter (TMR0) with 8-bit prescaler, and 64 bytes of non-volatile EEPROM data memory. The /SS suffix denotes the 20-pin SSOP package, while the -04 speed grade marks a 4 MHz maximum oscillator input and the I suffix indicates the industrial temperature range of -40 C to +85 C. The 20-pin SSOP provides 13 I/O plus VDD, VSS, MCLR and OSC1/OSC2 pins.
Typical applications include battery-powered sensor nodes, consumer appliance controllers, hobby and education boards, low-cost user-interface controllers, and small logic-replacement designs that benefit from in-system reprogrammability. When designing with this device, place a 100 nF decoupling capacitor close to VDD and route the MCLR pin through a 10 kohm pull-up to VDD to allow clean in-circuit serial programming. Avoid leaving unused I/O pins floating - configure them as outputs to minimize current draw in sleep mode.
ドロップイン代替品: PIC16LF84A-04I/SS — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: PIC16LF84A-04I/SS （同一形状・フットプリント） — 相違点: Timers, Package, Core Architecture, Watchdog Timer, Operating Temperature.
クイック比較ツール — 並列比較する代替部品を選択:
PIC16F84A-04I/SS
✅ ドロップイン📋 参考代替品（カタログ未掲載）
PIC16LF84A-04I/SO
✅ ドロップイン✓ 在庫あり
$2.21 / 個
データシートを見る →PIC16LF84A-04/SS
✅ ドロップイン✓ 在庫あり
$2.1 / 個
データシートを見る →PIC16F84A-20I/SS
✅ ドロップイン✓ 在庫あり
$1.65 / 個
データシートを見る →PIC16LF84AT-04I/SS
✅ ドロップイン✓ 在庫あり
$1.65 / 個
データシートを見る →PIC16F628A-I/SS
✅ ドロップイン✓ 在庫あり
$1.41 / 個
データシートを見る →PIC16LF84A-04I/SS 最大定格＆電気的特性
| Core Architecture | PIC RISC, 8-bit Harvard |
| Program Memory | 1.75 KB (1K x 14) Flash |
| Data SRAM | 68 bytes |
| EEPROM Data Memory | 64 bytes |
| Maximum Clock Input | 4 MHz |
| Instruction Cycle Time | 200 ns @ 4 MHz |
| Number of Instructions | 35 single-word |
| I/O Pins | 13 |
| Timers | TMR0 8-bit with prescaler |
| Watchdog Timer | Yes (software enabled) |
| Supply Voltage (LF) | 2.0 V to 5.5 V |
| 動作温度 | -40 C to +85 C (industrial) |
| パッケージ | 20-pin SSOP (5.30 mm) |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
| In-Circuit Programming | ICSP via RB6/RB7 |
| Hardware Stack | 8-level |
PIC16LF84A-04I/SS ピン構成
| ピン 1 | RA2 — Bidirectional I/O port A bit 2 |
| ピン 2 | RA3 — Bidirectional I/O port A bit 3 |
| ピン 3 | RA4/T0CKI — Bidirectional I/O port A bit 4 / TMR0 clock input |
| ピン 4 | MCLR/VPP — Master Clear (active low reset) / programming voltage input |
| ピン 5 | VSS — Ground reference |
| ピン 6 | RB0/INT — Bidirectional I/O port B bit 0 / external interrupt input |
| ピン 7 | RB1 — Bidirectional I/O port B bit 1 |
| ピン 8 | RB2 — Bidirectional I/O port B bit 2 |
| ピン 9 | RB3 — Bidirectional I/O port B bit 3 |
| ピン 10 | RB4 — Bidirectional I/O port B bit 4 |
| ピン 11 | RB5 — Bidirectional I/O port B bit 5 |
| ピン 12 | RB6 — Bidirectional I/O port B bit 6 / ICSP clock |
| ピン 13 | RB7 — Bidirectional I/O port B bit 7 / ICSP data |
| ピン 14 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| ピン 15 | OSC2/CLKOUT — Oscillator crystal output / CLKOUT |
| ピン 16 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| ピン 17 | RA0 — Bidirectional I/O port A bit 0 |
| ピン 18 | RA1 — Bidirectional I/O port A bit 1 |
| ピン 19 | NC — Not connected (per datasheet, reserved) |
| ピン 20 | NC — Not connected (per datasheet, reserved) |
主な用途
PIC16LF84A-04I/SS の用途: 6 件s: Battery-Powered Sensor Nodes, Consumer Appliance User-Interface Controllers, Educational and Hobby Development Boards, Discrete Logic Replacement and Glue Logic, Automotive Interior Lighting Controllers (non-safety), Industrial Control Module (Modbus RTU Slave).
Battery-Powered Sensor Nodes
The PIC16LF84A-04I/SS is well-suited to battery-powered sensor nodes because its 2.0 V to 5.5 V supply range enables direct operation from a single lithium coin cell or two alkaline cells across the full discharge curve, eliminating boost converters and their quiescent current. The 35-instruction RISC core consumes microamp-level sleep current, allowing months of battery life when the node wakes periodically to read a temperature or motion sensor. The 1.75 KB Flash and 64-byte EEPROM comfortably hold application firmware plus per-device calibration constants stored across power cycles. In a typical design, the MCU sleeps at <1 uA, wakes via watchdog timeout to read the sensor, transmits a packet over a UART-driven radio, and returns to sleep - all on a 3 V coin cell. Compared to discrete logic, the integrated brown-out reset and watchdog timer protect the node from brown-outs and code lockups in unattended deployments.
おすすめ
Consumer Appliance User-Interface Controllers
The PIC16LF84A-04I/SS drives cost-effective user-interface panels in coffee machines, microwave ovens, washing machines and small kitchen appliances where 13 I/O pins easily accommodate a 4x3 keypad matrix plus 5-7 LED indicators. The 200 ns instruction cycle handles button-debounce loops and LED-multiplex refresh without processor loading, and the in-circuit serial programming (ICSP) interface lets the manufacturer update firmware on the assembly line or in service centers. The PIC16F8X instruction set is so compact (only 35 single-word opcodes) that firmware fits in the 1.75 KB Flash even with rotary-encoder decoding and seven-segment display driving. The 8-level hardware stack is adequate for the interrupt-driven keypad scan routines typical of these appliances, and the on-chip EEPROM stores user-set clock values and last-mode memory across power loss.
おすすめ
Educational and Hobby Development Boards
The PIC16LF84A-04I/SS is the canonical microcontroller taught in introductory embedded systems courses and used in countless hobby projects because the 35-instruction RISC core can be learned in a single lab session. The 4 MHz instruction cycle and 200 ns execution time make timing loops directly observable on an oscilloscope, and the 13 I/O pins provide enough headroom for breadboard-based experiments with LEDs, pushbuttons, 7-segment displays and simple serial interfaces. The ICSP programming via RB6/RB7 allows students to debug iteratively without removing the part from the breadboard, dramatically reducing hardware damage. The SSOP-20 footprint also accepts SOIC-20 adapter boards, broadening prototyping flexibility for both surface-mount and through-hole training labs. Its 1.75 KB Flash capacity hosts full C-compiler output for libraries and bootloader code, yet small enough to teach hand-assembled instruction exercises.
おすすめ
Discrete Logic Replacement and Glue Logic
Designers use the PIC16LF84A-04I/SS to replace banks of 74-series TTL or HC logic chips that implement sequencers, counters, latches and state machines in legacy designs. With 13 I/O pins, 64 bytes EEPROM for state storage and 200 ns response, a single PIC16LF84A-04I/SS can replace 3-6 SSI/MSI logic packages, simplifying PCB layout and BOM cost while adding programmable flexibility for last-minute design changes. The 2.0-5.5 V supply range makes the part compatible with both 3.3 V and 5 V logic families, simplifying interface to modern low-voltage peripherals. The watchdog timer and brown-out reset add the safety features absent in pure-logic sequencers, while ICSP lets the engineer iterate on the state machine without re-spinning the PCB. Code reuse is high because the 35-instruction set is straightforward to hand-code for simple sequencer replacements.
おすすめ
Automotive Interior Lighting Controllers (non-safety)
The PIC16LF84A-04I/SS supports interior ambient lighting controllers for door panels, footwells, and dashboard accent LEDs in non-safety automotive applications where the industrial -40 to +85 C temperature range is acceptable. The 13 I/O pins can PWM-drive 4-6 LED channels via MOSFET drivers while reading rotary brightness encoders and pushbutton inputs. The 1.75 KB Flash holds a comfortable fade-pattern library plus button-debounce state machines, and the on-chip EEPROM stores user preferences such as last brightness across battery disconnects. The 2.0-5.5 V supply tolerates cranking transients on 12 V automotive rails when fed through a low-dropout regulator. For safety-critical functions such as airbag controllers or ADAS, the AEC-Q100-qualified PIC16F family members are the correct choice instead.
おすすめ
Industrial Control Module (Modbus RTU Slave)
The PIC16LF84A-04I/SS implements a low-cost Modbus RTU slave node on industrial RS-485 links where the 4 MHz instruction cycle is more than adequate for 9600-38400 baud bit-banged UART communication. With 13 I/O, the part simultaneously drives an RS-485 transceiver enable line, monitors 4-6 digital inputs, and controls 2-3 relay outputs while maintaining the Modbus state machine in 1.75 KB Flash. The 64-byte EEPROM stores the device address, baud rate and last-state holding registers across power cycles, while the 68-byte RAM holds the Modbus PDU and input image. The industrial -40 to +85 C temperature rating matches most factory-floor enclosure environments. The watchdog timer automatically recovers the slave from transient EMI-induced code lockups typical of industrial settings, and ICSP enables firmware updates in the field without removing the module from the DIN rail.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: PIC16LF84A-04I/SS — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | PIC16F84A-04I/SS | PIC16LF84A-04/SS | PIC16F84A-20I/SS | PIC16LF84AT-04I/SS | PIC16F628A-I/SS |
|---|---|---|---|---|---|---|
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Supply Voltage | 2.0 V to 5.5 V (LF) | 4.0 V to 5.5 V | 2.0 V to 5.5 V | 4.0 V to 5.5 V | 2.0 V to 5.5 V | 3.0 V to 5.5 V |
| Max Clock | 4 MHz | 4 MHz | 4 MHz | 20 MHz | 4 MHz | 20 MHz |
| Flash Program Memory | 1.75 KB | 1.75 KB | 1.75 KB | 1.75 KB | 1.75 KB | 3.5 KB |
| Data SRAM | 68 bytes | 68 bytes | 68 bytes | 68 bytes | 68 bytes | 224 bytes |
| EEPROM | 64 bytes | 64 bytes | 64 bytes | 64 bytes | 64 bytes | 128 bytes |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 16 |
| Temperature Range | -40 C to +85 C (I) | -40 C to +85 C (I) | 0 C to +70 C | -40 C to +85 C (I) | -40 C to +85 C (I) | -40 C to +85 C (I) |
主な差別化要因
- Wider supply-voltage range enables single-cell battery operation （vs PIC16F84A-04I/SS)
- Industrial -40 to +85 C temperature range （vs PIC16LF84A-04/SS)
- Five-times faster clock headroom when stepping up （vs PIC16F84A-04I/SS)
- Enhanced peripheral path without changing PCB layout （vs PIC16F628A-I/SS)
設計ノート
Decouple VDD (pin 14) with a 100 nF ceramic capacitor placed within 5 mm of the package, plus a 10 uF bulk capacitor at the regulator output. The PIC16LF84A-04I/SS operates from 2.0 V to 5.5 V, so a low-dropout regulator such as MCP1700 is appropriate for cell-powered designs. Add a 10 kohm pull-up on MCLR/VPP (pin 4) to enable reliable ICSP programming - leaving MCLR floating is a common cause of intermittent reset on breadboard prototypes.
Route the OSC1/OSC2 traces (pins 15-16) short and symmetric, and place the crystal/ceramic resonator and its load capacitors (typically 15-33 pF) within a few millimeters of the pins to minimize parasitic capacitance. When using an external clock source, drive OSC1 with a CMOS-level signal and leave OSC2 floating. Keep clock traces away from switching power or relay lines to prevent injection of noise into the 200 ns instruction cycle timing.
Do not leave unused I/O pins floating - configure them as outputs (write 0 to the TRIS register) to draw a defined current and avoid spurious input transitions that can wake the part from sleep. Never drive MCLR with a slow-rising signal; the brown-out reset works correctly only with a fast-edged reset. When using ICSP, ensure the programmer's VPP voltage does not exceed 13.5 V or the part may enter high-voltage programming mode unintentionally. The watchdog timer must be cleared (CLRWDT) within the prescaler window or the device will reset - document this behavior in firmware comments.
RB0 doubles as the external interrupt (INT) input and is the only edge-sensitive interrupt source on the PIC16LF84A-04I/SS. Configure OPTION_REG<INTEDG> for rising or falling edge selection. When reading mechanical switches, software debounce on the order of 5-20 ms is required because the input Schmitt trigger has a hysteresis of approximately 0.4 V but no time-domain filtering. Use the on-chip TMR0 prescaler to extend the watchdog timer to its maximum 2.3 s timeout for sleep-mode wakeup.
コンプライアンス情報
RoHS-compliant per Microchip product page and DigiKey listing. Lead-free NiPdAu finish. Halogen-free per Microchip environmental compliance. Not AEC-Q100 qualified - this part targets industrial and consumer markets. For AEC-Q100 applications use qualified PIC16F family members. Conflict-minerals declaration available on request through Microchip.
