ATTINY44A-SSU - 4KB Flash 20MHz 8-bit AVR MCU | Microchip
Teilenummer: ATTINY44A-SSU ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 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 Übersicht
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.
Drop-in-Alternativen für ATTINY44A-SSU – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit ATTINY44A-SSU (gleiche Bauform und Footprint) – abweichend in Package, ADC, Operating Temperature, EEPROM, Maximum Clock Frequency.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
ATTINY44A-SSUR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ATTINY44-20SSU
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ATTINY441-SSUR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ATTINY24A-SSU
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ATTINY412-SSF
✅ Drop-In✓ Auf Lager
$0.36 / Stück
Datenblatt ansehen →ATTINY412-SSNR
✅ Drop-In✓ Auf Lager
$0.42 / Stück
Datenblatt ansehen →ATTINY44A-SSU Grenzwerte & elektrische Eigenschaften
| Core Architecture | AVR 8-bit RISC |
| Program Memory (Flash) | 4 KB (2K x 16) |
| EEPROM | 256 bytes |
| SRAM | 256 bytes |
| Maximale Taktfrequenz | 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) |
| Betriebstemperatur | -40C to +85C (Industrial) |
| Gehäuse | 14-pin SOIC (150-mil) |
| Montageart | Surface Mount |
| Programming Interface | ISP (SPI) + debugWIRE |
| MSL-Level | 1 (Unlimited) |
| RoHS-Status | Compliant |
ATTINY44A-SSU Pin-Konfiguration
| 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 |
Typische Anwendungen
ATTINY44A-SSU ist geeignet für 6 Anwendungs: 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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ATTINY44A-SSU – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | 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) |
Wichtigste Unterscheidungsmerkmale
- Wider voltage range with same Flash and pinout (vs. ATTINY44-20SSU)
- More memory than its predecessor, same package (vs. ATTINY24A-SSU)
- Upgrade path with double SRAM and 12-bit ADC option (vs. ATTINY441-SSUR)
- Lower power consumption than modern tinyAVR-2 (vs. ATTINY412-SSF)
Designhinweise
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.
Compliance-Informationen
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.
