ATMEGA88-20MJ - 8-bit AVR MCU 20MHz 8KB Flash VQFN-32 | Microchip
MPN: ATMEGA88-20MJ ✓ Hoạt độngATMEGA88-20MJ Tóm tắt
An 8-bit microcontroller integrates a processor core, memory, and peripherals on a single chip, forming the lowest tier of the embedded processing hierarchy (MCU -> embedded processor -> microcontroller -> semiconductor). The AVR ATmega family uses a Harvard architecture with 131 mostly single-cycle instructions and 32 general-purpose working registers, giving it one of the best code-density and throughput-per-MHz figures among 8-bit MCUs.
Key features of the ATMEGA88-20MJ include operation from 1.8 V to 5.5 V (the 20 MHz speed grade requires 4.5 V to 5.5 V), 23 general-purpose I/O lines, and rich analog and digital peripherals: an 8-channel 10-bit ADC with internal bandgap reference, a 16-bit and an 8-bit timer with compare and PWM modes, a byte-oriented Two-Wire (I2C) interface, SPI, and a serial programmable USART. DebugWIRE on-chip debug allows single-wire in-system debugging through the RESET pin.
Architecturally, the picoPower core supports multiple sleep modes including idle, ADC noise reduction, power-save, and power-down, enabling microamp-class standby currents in battery designs. Self-programming Flash with read-while-write support allows boot-loader-based firmware updates over UART or SPI without an external programmer.
Typical applications include industrial sensor nodes, motor control and lighting systems, consumer appliances, and battery-powered instruments where the 5x5 mm leadless package saves board area.
Design consideration: at 20 MHz the part must operate from 4.5 V to 5.5 V; for 3.3 V or 1.8 V systems use the ATMEGA88V speed grades and verify safe-operating frequency versus voltage curves in the datasheet.
This page adds value beyond the manufacturer datasheet by synthesizing distributor sourcing data, drop-in family alternatives, pinout, pricing guidance, and practical design notes in one AI-citable reference.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA88-20MJ — 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 ATMEGA88-20MJ (cùng hình factor và footprint) — khác nhau ở Package, Communication Interfaces, Timers, EEPROM, SRAM.
ATMEGA88A-20MU
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA88PA-20MU
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA88PV-10MU
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA168PA-20MU
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA328P-MU
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA88V-10MJ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATMEGA88-20MJ Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit AVR RISC (Harvard) |
| Tần số xung maksimum | 20 MHz |
| Peak Throughput | Up to 20 MIPS at 20 MHz |
| Flash Program Memory | 8 KB (4K x 16), ISP, self-programming |
| SRAM | 1 KB |
| EEPROM | 512 B |
| Supply Voltage Range | 1.8 V to 5.5 V (4.5 V to 5.5 V for 20 MHz speed grade) |
| General Purpose I/O | 23 I/O lines |
| Working Registers | 32 x 8-bit general purpose |
| Instructions | 131 instructions, most single-cycle |
| ADC | 8-channel 10-bit with internal reference |
| Timers | 1 x 8-bit, 1 x 16-bit with compare/PWM |
| Communication Interfaces | I2C (Two-Wire), SPI, UART/USART |
| On-Chip Debug | DebugWIRE |
| Hộp | 32-VQFN (MLF) 5x5 mm |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân ATMEGA88-20MJ
| Chân 1 | PC6/RESET — Port C bit 6 or active-low Reset input (DebugWIRE) |
| Chân 2 | PD0/RXD — Port D bit 0, USART receive input |
| Chân 3 | PD1/TXD — Port D bit 1, USART transmit output |
| Chân 4 | PD2/INT0 — Port D bit 2, external interrupt 0 |
| Chân 5 | PD3/INT1/OC2B — Port D bit 3, external interrupt 1, Timer2 output compare B |
| Chân 6 | PD4/T0/XCK — Port D bit 4, Timer0 external clock, USART external clock |
| Chân 7 | VCC — Digital supply voltage |
| Chân 8 | GND — Ground |
| Chân 9 | PB6/XTAL1/TOSC1 — Port B bit 6, crystal oscillator input / Timer oscillator |
| Chân 10 | PB7/XTAL2/TOSC2 — Port B bit 7, crystal oscillator output / Timer oscillator |
| Chân 11 | PD5/T1/OC0B — Port D bit 5, Timer1 external clock, Timer0 output compare B |
| Chân 12 | PD6/AIN0/OC0A — Port D bit 6, analog comparator positive input, Timer0 output compare A |
| Chân 13 | PD7/AIN1 — Port D bit 7, analog comparator negative input |
| Chân 14 | PB0/ICP1/CLKO — Port B bit 0, Timer1 input capture, system clock output |
| Chân 15 | PB1/OC1A — Port B bit 1, Timer1 output compare A (PWM) |
| Chân 16 | PB2/SS/OC1B — Port B bit 2, SPI slave select, Timer1 output compare B (PWM) |
| Chân 17 | PB3/MOSI/OC2A — Port B bit 3, SPI master output, Timer2 output compare A (PWM) |
| Chân 18 | PB4/MISO — Port B bit 4, SPI master input |
| Chân 19 | PB5/SCK — Port B bit 5, SPI serial clock |
| Chân 20 | AVCC — ADC supply voltage |
| Chân 21 | ADC6 — ADC input channel 6 |
| Chân 22 | AREF — ADC analog reference input |
| Chân 23 | GND — Ground |
| Chân 24 | ADC7 — ADC input channel 7 |
| Chân 25 | PC0/ADC0 — Port C bit 0, ADC input channel 0 |
| Chân 26 | PC1/ADC1 — Port C bit 1, ADC input channel 1 |
| Chân 27 | PC2/ADC2 — Port C bit 2, ADC input channel 2 |
| Chân 28 | PC3/ADC3 — Port C bit 3, ADC input channel 3 |
| Chân 29 | PC4/ADC4/SDA — Port C bit 4, ADC channel 4, Two-Wire data line |
| Chân 30 | PC5/ADC5/SCL — Port C bit 5, ADC channel 5, Two-Wire clock line |
| Chân 31 | NC — Not connected (per datasheet) |
| Chân 32 | NC — Not connected (per datasheet) |
| Chân 33 | VCC (exposed pad) — Exposed pad, connect to VCC (per datasheet) |
| Chân 34 | GND (exposed pad) — Exposed pad, connect to GND (per datasheet) |
Ứng dụng tiêu biểu
ATMEGA88-20MJ phù hợp cho 6 Áp dụngs: Industrial Sensor Nodes, Motor Control and PWM Systems, Battery-Powered Portable Instruments, LED Lighting and Dimming Control, Consumer Appliance Control, Embedded Learning and Prototyping.
Industrial Sensor Nodes
The ATMEGA88-20MJ fits industrial sensor acquisition nodes because its 8-channel 10-bit ADC directly digitizes thermistor, potentiometer, and 0-5 V transducer signals without an external converter, while the 20 MHz core delivers 20 MIPS for local filtering and decision logic. The 32-VQFN 5x5 mm package conserves board area in compact DIN-rail and machinery-mounted modules, and the industrial temperature capability suits control cabinets. Placed with a 16 MHz crystal or internal RC clock and the USART bridged to RS-485 transceivers, the node streams digitized data while picoPower-class sleep modes in successor revisions (ATMEGA88PA) cut standby current. The 512 B EEPROM retains calibration coefficients through power cycles without external NVM.
Được đề xuất
Motor Control and PWM Systems
With one 16-bit timer and one 8-bit timer providing compare channels and hardware PWM, the ATMEGA88-20MJ drives DC and brushless motor H-bridges directly at 20 MHz resolution of 50 ns per PWM step. The 20 MIPS RISC core executes PID control loops with cycle-level determinism, while the 10-bit ADC reads back current shunt and back-EMF signals on up to 8 channels for closed-loop control. In a 5 V system the 23 GPIO lines source up to 20 mA each, sufficient to gate small MOSFET drivers. Typical implementations run the 16-bit timer at full clock in fast-PWM mode; the VQFN exposed GND pad provides a low-inductance return path that reduces switching-noise coupling into the analog front end.
Được đề xuất
Battery-Powered Portable Instruments
Operating from 1.8 V to 5.5 V, the ATMEGA88-20MJ runs directly from two alkaline cells or a single lithium cell through an LDO, eliminating regulated-supply complexity in portable meters and data loggers. Sleep modes including power-down and power-save cut current to microamp levels so instruments idle for months between measurements; the asynchronous Timer/Counter can keep real-time counting while the core sleeps. The internal 1.1 V bandgap reference supports ratiometric ADC measurements without external references, and 512 B EEPROM logs calibration and limited data between sessions. Designs prioritizing battery life should specify the picoPower ATMEGA88PA-20MU drop-in revision, which further reduces deep-sleep current while keeping the identical 32-VQFN footprint.
Được đề xuất
LED Lighting and Dimming Control
Hardware PWM from the 16-bit Timer/Counter makes the ATMEGA88-20MJ a compact LED dimming engine: at 20 MHz, 16-bit PWM resolution produces flicker-free dimming curves above 1 kHz carrier, and the 10-bit ADC can monitor current through a shunt for constant-current regulation. Multiple compare channels drive several color channels (RGB or tunable-white) independently, with 23 GPIO lines covering indicator, button, and communication duties in a single 5x5 mm package. DALI or DMX-style protocols are commonly bit-banged or driven from the USART. The VQFN-32 footprint keeps the controller beside the LED driver on dense luminaire PCBs, and the 5.5 V ceiling suits direct 5 V constant-voltage LED strip systems.
Được đề xuất
Consumer Appliance Control
Home appliances such as fans, coffee machines, and small pumps use the ATMEGA88-20MJ as a cost-effective control core: triac or relay outputs from GPIO, capacitive-touch or mechanical button inputs read through the ADC, and NTC temperature sensing on a second ADC channel closes thermostat loops. The 20 MIPS throughput handles UI state machines and safety interlock checking concurrently, while the brown-out detector and watchdog timer provide the reset discipline expected in mains-adjacent products. Self-programming Flash allows a USART bootloader so firmware can be updated on the assembly line or in the field without a test fixture. The 32-VQFN MLF body withstands reflow assembly on high-volume appliance boards.
Được đề xuất
Embedded Learning and Prototyping
Because the ATmega88 shares its architecture, register map, and 32-VQFN/TQFP pinout with the famous ATmega328P of Arduino fame, it remains a widely used teaching and prototyping MCU: 131 mostly single-cycle AVR instructions give students predictable timing, and the DebugWIRE single-wire debugger needs only the RESET line, minimizing harness complexity on breadboards and prototype PCBs. Free toolchains (AVR-GCC, Microchip Studio) and the abundant Arduino ecosystem provide code examples that port with a device recompile. The 8 KB Flash comfortably holds classic exercises - UART echo, ADC voltmeter, SPI/I2C sensor drivers - while teaching memory budgeting. ISP programming requires only six header pins, making lab boards trivial to design.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA88-20MJ — 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 | ATMEGA88A-20MU | ATMEGA88PA-20MU | ATMEGA168PA-20MU | ATMEGA328P-MU |
|---|---|---|---|---|---|
| Package | 32-VQFN (MLF) 5x5 mm | 32-VQFN (MLF) 5x5 mm - same | 32-VQFN (MLF) 5x5 mm - same | 32-VQFN (MLF) 5x5 mm - same | 32-VQFN (MLF) 5x5 mm - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 8 KB | 8 KB | 8 KB | 16 KB | 32 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 2 KB |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 10 MHz | 20 MHz |
| PicoPower Low Sleep Current | No (standard ATmega88 core) | No | Yes | Yes | Yes |
| Timers | 1 x 8-bit, 1 x 16-bit | 1 x 8-bit, 1 x 16-bit | 1 x 8-bit, 1 x 16-bit | 2 x 8-bit, 1 x 16-bit | 2 x 8-bit, 1 x 16-bit |
| Communication Interfaces | I2C, SPI, USART | I2C, SPI, USART | I2C, SPI, USART | I2C, SPI, USART | I2C, SPI, USART |
Bảo phân biệt quan trọng
- Lowest-cost family entry point (vsATMEGA168PA-20MU)
- Full 20 MHz speed in wide-stock package (vsATMEGA88PV-10MU)
- Trade-off: not picoPower (vsATMEGA88PA-20MU)
Ghi chú thiết kế
Respect the speed-versus-voltage derating: the 20 MHz grade is guaranteed only from 4.5 V to 5.5 V per the datasheet maximum frequency curves. At 3.3 V, safe operation is approximately 13.3 MHz maximum. Running 20 MHz at reduced VCC may work on a bench sample but is out of specification over temperature and lot variation. Decouple VCC and AVCC separately with 100 nF ceramics placed within 2 mm of the pins, and connect AVCC to VCC through an LC filter in mixed-signal designs to protect ADC accuracy.
The VQFN (MLF) exposed pads 33 (VCC) and 34 (GND) are electrically required, not optional thermal enhancements - the die return path depends on the GND pad. Design the land pattern with vias in the center pad solder window (typically 4-6 vias of 0.3 mm) to tie the GND pad to the ground plane, and use sufficient solder paste coverage to avoid voids. Leadless packages reflow poorly with excessive paste; follow the datasheet-recommended stencil aperture reduction around 50 percent for the center pad.
DebugWIRE shares the RESET pin with ISP programming: enabling DWEN disables external reset and normal high-voltage/ISP entry until DWEN is cleared, which has stranded many designs. Always leave a 6-pin ISP header or ensure access to an STK500/high-voltage programmer before enabling DebugWIRE. Also remember PB6/PB7 default to crystal pins - using them as GPIO requires clearing the CKOPT/fuse bits correctly, and misconfiguring clock fuses can brick the device to external-clock recovery.
Estimated: an ATmega88 running 20 MHz at 5 V dissipates roughly 0.1 W of core current (about 20 mA) plus I/O drive; with the VQFN-32 theta-JA on a standard 4-layer board (order of 40-60 C/W), junction rise stays under 10 C - no heatsinking is needed for typical MCU loads. Verify actual ICC from the datasheet active-current curves for your clock source and I/O configuration rather than relying on this estimate.
Thông tin tuân thủ
Compliance status not stated in the provided web data; verify RoHS/REACH status on the Microchip product page certificate of conformance for this exact suffix (MJ).
