ATTINY44A-SSU - 4KB Flash 20MHz 8-bit AVR MCU | Microchip
N.º de pieza: ATTINY44A-SSU ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.95 | $1,95 |
| 10 | $1.72 | $17,20 |
| 100 | $1.46 | $146,00 |
| 500 | $1.28 | $640,00 |
| 1.000 | $1.12 | $1.120,00 |
ATTINY44A-SSU Descripción general
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working RAM, and programmable peripherals into one package. The 8-bit AVR RISC architecture is Harvard-based with separate program and data buses, executing most instructions in a single clock cycle. This places the ATTINY44A in the broader hierarchy: microcontroller -> embedded MCU -> semiconductor -> integrated circuit. It belongs to the tinyAVR subfamily, optimized for low pin-count, low-power applications.
Key features include a 10-bit ADC with up to 8 channels, two 8-bit timer/counters with PWM, one 16-bit timer/counter with two PWM channels, an internal calibrated 8 MHz oscillator, internal voltage reference, programmable watchdog timer with separate on-chip oscillator, and four software-selectable power-saving modes. The chip operates from 1.8 V to 5.5 V, drawing as little as sub-microamp current in power-down.
The AVR core uses single-cycle pipelined execution with a rich instruction set, simplifying C compiler code generation. ISP (In-System Programming) via SPI and debugWIRE on-chip debug eliminate the need for an external programmer port, while the peripheral touch controller supports capacitive sensing buttons for HMI.
Typical applications include battery-powered sensor nodes, LED light controllers, remote controls, low-cost motor control, consumer appliances, and IoT edge devices. The wide voltage range and deep sleep modes make it suitable for energy-harvesting designs.
Designers should configure unused pins as inputs with internal pull-ups enabled to minimize sleep current and prevent floating-node noise coupling into the analog ADC inputs.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that are not consolidated in the manufacturer datasheet.
Alternativas directas para ATTINY44A-SSU — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ATTINY44A-SSU (mismo factor de forma y huella) — difiere en Package, ADC, Operating Temperature, EEPROM, Maximum Clock Frequency.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ATTINY44A-SSUR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ATTINY44-20SSU
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ATTINY441-SSUR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ATTINY24A-SSU
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ATTINY412-SSF
✅ Sustitución directa✓ En stock
$0.36 / unidad
Ver hoja de datos →ATTINY412-SSNR
✅ Sustitución directa✓ En stock
$0.42 / unidad
Ver hoja de datos →ATTINY44A-SSU Valores máximos y características eléctricas
| Core Architecture | AVR 8-bit RISC |
| Program Memory (Flash) | 4 KB (2K x 16) |
| EEPROM | 256 bytes |
| SRAM | 256 bytes |
| Frecuencia de reloj máxima | 20 MHz |
| Operating Voltage (VCC) | 1.8 V to 5.5 V |
| I/O Pins | 12 |
| ADC | 10-bit, 8 channels |
| Timers/Counters | 1 x 8-bit + 1 x 16-bit (PWM) |
| Temperatura de funcionamiento | -40C to +85C (Industrial) |
| Encapsulado | 14-pin SOIC (150-mil) |
| Tipo de montaje | Surface Mount |
| Programming Interface | ISP (SPI) + debugWIRE |
| Nivel MSL | 1 (Unlimited) |
| Estado RoHS | Compliant |
Configuración de pines de ATTINY44A-SSU
| Pin 1 | VCC — Power supply input (1.8 V to 5.5 V) |
| Pin 2 | PB0 (MOSI/DI/SDA/AIN0/OC0A/AREF/PCINT8) — Port B bit 0 / SPI MOSI / I2C SDA / ADC ch0 / Analog comparator input |
| Pin 3 | PB1 (MISO/DO/AIN1/OC0B/PCINT9) — Port B bit 1 / SPI MISO / ADC ch1 / Analog comparator input |
| Pin 4 | PB3 (PCINT11/RESET) — Reset input (active low) or Port B bit 3; weak drive strength when used as RESET per datasheet |
| Pin 5 | PB2 (SCK/USCK/SCL/ADC7/PCINT10) — Port B bit 2 / SPI SCK / I2C SCL / ADC ch7 |
| Pin 6 | PA7 (ADC6/OC1B/PCINT7) — Port A bit 7 / ADC ch6 / Timer1 channel B PWM output |
| Pin 7 | PA6 (ADC5/OC1A/PCINT6) — Port A bit 6 / ADC ch5 / Timer1 channel A PWM output |
| Pin 8 | PA5 (ADC4/OC0B/PCINT5) — Port A bit 5 / ADC ch4 / Timer0 channel B PWM output |
| Pin 9 | PA4 (ADC3/OC0A/PCINT4) — Port A bit 4 / ADC ch3 / Timer0 channel A PWM output |
| Pin 10 | PA3 (ADC2/PCINT3) — Port A bit 3 / ADC ch2 |
| Pin 11 | PA2 (ADC1/AIN0/PCINT2) — Port A bit 2 / ADC ch1 / Analog comparator positive input |
| Pin 12 | PA1 (ADC0/AIN1/PCINT1) — Port A bit 1 / ADC ch0 / Analog comparator negative input |
| Pin 13 | PA0 (PCINT0/OC0A/AREF) — Port A bit 0 / Analog reference voltage input |
| Pin 14 | GND — Ground reference |
Aplicaciones típicas
ATTINY44A-SSU es adecuado para 6 aplicacións: Battery-Powered IoT Sensor Node, LED Light Controller, Remote Control Transmitter, Low-Cost BLDC / Fan Motor Control, Consumer Appliance Interface Board, Capacitive Touch Button Controller.
Battery-Powered IoT Sensor Node
The ATTINY44A-SSU's 1.8 V to 5.5 V VCC range and picoPower sleep modes below 1 uA make it ideal for battery-powered IoT sensor nodes that wake periodically to read sensors and transmit. The 10-bit ADC with 8 channels supports temperature, light, and battery voltage measurements without an external analog frontend. Its 4 KB Flash is sufficient for a sensor reading loop, threshold detection, and a simple RF protocol stack. The 14-pin SOIC footprint fits on a coin-cell sensor module.
Recomendado
LED Light Controller
The ATTINY44A-SSU's 16-bit timer with two PWM channels drives high-brightness LEDs with smooth dimming and color mixing. Its 20 MHz clock provides enough resolution for flicker-free PWM at frequencies above 1 kHz, avoiding audible noise and visible flicker. The 12 GPIO pins handle multiple LED strings, push-button inputs, and a UART link for control signals. picoPower sleep modes enable standby currents below 10 uA for mains-powered but idle luminaires.
Recomendado
Remote Control Transmitter
The ATTINY44A-SSU's small 14-pin SOIC footprint and low active current around 1 mA at 1 MHz suit handheld remote controls. Its 12 GPIO lines connect to a 4x4 matrix keypad or capacitive touch buttons, while an internal timer drives the 38 kHz carrier for IR transmission. The 4 KB Flash fits button mapping, IR protocol encoding, and low-battery detection firmware. Internal 8 MHz oscillator eliminates the need for an external crystal.
Recomendado
Low-Cost BLDC / Fan Motor Control
The ATTINY44A-SSU drives small brushless DC motors and fans using its 16-bit timer PWM outputs and ADC for back-EMF sensing. The wide 1.8-5.5 V VCC range supports 3.3 V and 5 V motor rails directly. With 12 GPIO, the MCU handles three half-bridge enable signals, a tachometer input, and a UART debug port. Its 20 MHz clock enables 16-bit PWM at 10 kHz with sufficient resolution for smooth torque control of small fans.
Recomendado
Consumer Appliance Interface Board
The ATTINY44A-SSU operates reliably in appliance environments from -40C to +85C industrial grade, handling button inputs, LED indicators, and buzzer control for white goods interfaces. Its 256 B EEPROM stores user preferences such as last mode and calibration constants without external storage. ISP via SPI supports factory firmware updates and field service programming through a 6-pin header. The 14-pin SOIC package is well-suited to hand-rework on appliance service boards.
Recomendado
Capacitive Touch Button Controller
The ATTINY44A-SSU supports up to 12 capacitive touch sensing buttons via its QTouch library and internal ADC, removing the need for a dedicated touch controller IC. Each GPIO can be configured with a sense capacitor and an internal pull-up for charge-transfer touch measurement. The 4 KB Flash accommodates QTouch libraries, debounce logic, and I2C/SPI host interface for system integration. picoPower modes keep standby touch-scan current below 5 uA.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATTINY44A-SSU — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATTINY44A-SSUR | ATTINY44-20SSU | ATTINY441-SSUR | ATTINY24A-SSU | ATTINY412-SSF |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-14 (150-mil) | SOIC-14 (150-mil) - same | SOIC-14 (150-mil) - same | SOIC-14 (150-mil) - same | SOIC-14 (150-mil) - same | SOIC-8 - not same |
| Flash Memory | 4 KB | 4 KB | 4 KB | 4 KB | 2 KB | 4 KB |
| SRAM | 256 B | 256 B | 256 B | 512 B | 128 B | 256 B |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 2.7 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 6 |
| ADC | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10/12-bit, 12 channels | 10-bit, 8 channels | 10/12-bit, 6 channels |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +125C |
| Core Architecture | AVR 8-bit | AVR 8-bit | AVR 8-bit | AVR 8-bit | AVR 8-bit | AVR 8-bit (tinyAVR-2) |
Diferenciadores clave
- Wider voltage range with same Flash and pinout (frente a ATTINY44-20SSU)
- More memory than its predecessor, same package (frente a ATTINY24A-SSU)
- Upgrade path with double SRAM and 12-bit ADC option (frente a ATTINY441-SSUR)
- Lower power consumption than modern tinyAVR-2 (frente a ATTINY412-SSF)
Notas de diseño
Estimated: Sleep current at 3.3 V with WDT disabled is approximately 0.1 uA per the picoPower specification. To achieve lowest sleep current, disable the analog comparator, ADC, and Brown-out Detector (BOD) before entering Power-Down mode. Configure unused pins as inputs with internal pull-ups enabled (PUE bit set) to prevent floating nodes that leak through ESD clamps.
Place a 100 nF decoupling capacitor as close as possible to the VCC pin (pin 1) and a 10 uF bulk capacitor near the device for high-current digital transients during ADC conversion. Keep the RESET pin trace short; add a 10 kohm pull-up to VCC and a 100 nF capacitor to ground if the pin is also used as a GPIO (PB3) to avoid false reset triggers. Route the ADC analog traces away from switching digital lines to preserve ADC SNR.
Do not exceed 5.5 V on any pin including RESET; the ATTINY44A-SSU has no internal clamping above VCC. When using debugWIRE, the RESET pin must be configured as reset and not as a regular GPIO. ISP via SPI requires MOSI/MISO/SCK plus RESET to be accessible; ensure your PCB exposes these for field programming. The internal 8 MHz oscillator is factory-calibrated but may drift over temperature - use the internal PLL or external crystal for time-critical UART or PWM applications.
For ADC accuracy above 8 bits, use the internal 1.1 V bandgap reference rather than VCC, and average 4 or more ADC samples to reduce noise. Switch the ADC off between conversions (ADCSRA bit ADEN) to save current; this also prevents ADC input leakage during sleep. Route sensitive analog inputs (PB0, PB1) away from the oscillator pins and clock traces.
Información de cumplimiento
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified - choose automotive-grade variants if required. Halogen-free status not explicitly stated in provided data.
