ATSAMDA1G15B-ABT - 48MHz Cortex-M0+ MCU 32KB Flash 48-TQFP | Microchip
MPN: ATSAMDA1G15B-ABT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.94 | $4.94 |
| 10 | $4.45 | $44.50 |
| 100 | $3.95 | $395.00 |
| 500 | $3.55 | $1,775.00 |
| 1,000 | $3.2 | $3,200.00 |
| 3,000 | $2.85 | $8,550.00 |
ATSAMDA1G15B-ABT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (SRAM), and a rich set of peripherals such as timers, communication interfaces, and analog blocks. Within the broader semiconductor hierarchy, an MCU belongs to the embedded processor family, sitting between simple 8-bit microcontrollers and application processors. The SAM DA1 family is the first sub-tier of the SAM D ARM Cortex-M0+ lineup and adds functional-safety (FuSa) hardware features including dual brown-out detectors, a windowed watchdog timer, and a Cortex-M0+ core with cycle-level deterministic interrupt response.
Key features include up to six SERCOM serial-communication modules (each independently configurable as USART, I2C, or SPI), a 12-bit ADC with up to 12 channels and 350 ksps throughput, a 10-bit DAC, two analog comparators, and up to 38 GPIO. The peripheral event system allows direct hardware-level signaling between on-chip peripherals without CPU intervention, reducing latency and power consumption.
The ATSAMDA1G15B-ABT uses a single-rail 1.62-3.63 V supply with an internal 8 MHz regulator and a separate 32.768 kHz low-power oscillator for RTC operation. Built-in ARM Serial Wire Debug, a 2-channel DMA controller, and the SAM D21/DA1 peripheral IP combine to make this device a low-power deterministic platform for safety-sensitive IoT nodes, sensor hubs, and human-machine-interface controllers.
Typical applications include industrial sensor conditioning, building automation, low-power wireless sensor nodes, appliance user-interface boards, and safety-conscious LED lighting controllers. Designers select this part when functional-safety support, ultra-low power, and a Cortex-M ecosystem are required.
When designing with this MCU, budget for an external 32.768 kHz crystal if RTC accuracy matters, and follow the Atmel/Microchip SAM DA1 errata for ADC offset calibration at temperatures below 0 degrees C. This page synthesizes distributor stock, drop-in alternatives, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for ATSAMDA1G15B-ABT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATSAMDA1G15B-ABT (same form factor and footprint) — differing in Package, ADC, Operating Temperature, SERCOM Modules, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMDA1G16B-ABT
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMDA1G14B-MBT
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →ATSAMDA1E16B-ABT
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →ATSAMD21G15B-AU
✅ Drop-In✓ In Stock
$1.65 / Unit
View Datasheet →ATSAMD21G15B-MUT
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →ATSAMDA1G15B-ABT Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0+ |
| Core Architecture | ARM 32-bit |
| Maximum Clock Frequency | 48 MHz |
| DMIPS | 45 |
| Program Memory (Flash) | 32 KB |
| RWW Flash | 1 KB |
| SRAM | 4 KB |
| Operating Voltage Range | 1.62 V to 3.63 V |
| Operating Temperature Range | -40C to +85C (Industrial) |
| SERCOM Modules | 6 (configurable as USART/SPI/I2C) |
| ADC | 12-bit, up to 12 channels, up to 350 ksps |
| DAC | 10-bit, 1 channel |
| Analog Comparators | 2 |
| GPIO Count | Up to 38 |
| DMA Channels | 2 (peripheral-to-memory, memory-to-memory) |
| Timers/Counters | TC x3, TCC x1, RTC x1, WDT x1 |
| Package | 48-pin TQFP (7x7x1.0 mm) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
ATSAMDA1G15B-ABT Pin Configuration
| Pin 1 | PA00 — General-purpose I/O / XIN32 (32.768 kHz crystal input) |
| Pin 2 | PA01 — General-purpose I/O / XOUT32 (32.768 kHz crystal output) |
| Pin 3 | PA02 — General-purpose I/O / AIN0 (ADC input channel 0) |
| Pin 4 | PA03 — General-purpose I/O / AIN1 / VREFA reference voltage |
| Pin 5 | VDD — Digital supply voltage |
| Pin 6 | GND — Ground |
| Pin 7 | PA04 — General-purpose I/O / AIN2 |
| Pin 8 | PA05 — General-purpose I/O / AIN3 |
| Pin 9 | PA06 — General-purpose I/O / AIN4 |
| Pin 10 | PA07 — General-purpose I/O / AIN5 |
| Pin 11 | PA08 — General-purpose I/O / AIN6 / SERCOM0 PAD0 |
| Pin 12 | PA09 — General-purpose I/O / AIN7 / SERCOM0 PAD1 |
| Pin 13 | PA10 — General-purpose I/O / AIN8 / SERCOM0 PAD2 |
| Pin 14 | PA11 — General-purpose I/O / AIN9 / SERCOM0 PAD3 |
| Pin 15 | VDDIO — I/O supply voltage |
| Pin 16 | GND — Ground |
| Pin 17 | PA12 — General-purpose I/O / SERCOM2 PAD0 |
| Pin 18 | PA13 — General-purpose I/O / SERCOM2 PAD1 |
| Pin 19 | PA14 — General-purpose I/O / SERCOM2 PAD2 |
| Pin 20 | PA15 — General-purpose I/O / SERCOM2 PAD3 |
| Pin 21 | PA16 — General-purpose I/O / SERCOM1 PAD0 |
| Pin 22 | PA17 — General-purpose I/O / SERCOM1 PAD1 |
| Pin 23 | PA18 — General-purpose I/O / SERCOM1 PAD2 |
| Pin 24 | PA19 — General-purpose I/O / SERCOM1 PAD3 |
| Pin 25 | PA20 — General-purpose I/O / SERCOM3 PAD0 |
| Pin 26 | PA21 — General-purpose I/O / SERCOM3 PAD1 |
| Pin 27 | PA22 — General-purpose I/O / SERCOM3 PAD2 |
| Pin 28 | PA23 — General-purpose I/O / SERCOM3 PAD3 |
| Pin 29 | PA24 — General-purpose I/O / SERCOM4 PAD0 / USB_DM |
| Pin 30 | PA25 — General-purpose I/O / SERCOM4 PAD1 / USB_DP |
| Pin 31 | GND — Ground |
| Pin 32 | VDD — Digital supply voltage |
| Pin 33 | PA26 — General-purpose I/O / SERCOM4 PAD2 |
| Pin 34 | PA27 — General-purpose I/O / SERCOM4 PAD3 |
| Pin 35 | PA28 — General-purpose I/O / SERCOM5 PAD0 |
| Pin 36 | PA29 — General-purpose I/O / SERCOM5 PAD1 |
| Pin 37 | PA30 — General-purpose I/O / SERCOM5 PAD2 / SWCLK |
| Pin 38 | PA31 — General-purpose I/O / SERCOM5 PAD3 / SWDIO |
| Pin 39 | PB00 — General-purpose I/O / AIN8 |
| Pin 40 | PB01 — General-purpose I/O / AIN9 |
| Pin 41 | PB02 — General-purpose I/O / AIN10 / SERCOM5 PAD0 |
| Pin 42 | PB03 — General-purpose I/O / AIN11 |
| Pin 43 | PB04 — General-purpose I/O / SERCOM3 PAD0 |
| Pin 44 | PB05 — General-purpose I/O / SERCOM3 PAD1 |
| Pin 45 | PB06 — General-purpose I/O / SERCOM3 PAD2 |
| Pin 46 | PB07 — General-purpose I/O / SERCOM3 PAD3 |
| Pin 47 | VDDIO — I/O supply voltage |
| Pin 48 | GND — Ground |
Typical Applications
ATSAMDA1G15B-ABT is suitable for 7 applications: Functional-Safety Appliance Controller, Building Automation Sensor Hub, Industrial Sensor Conditioning Module, Low-Power Wireless Sensor Node, Appliance User-Interface Board, Safety-Conscious LED Lighting Controller, Portable Medical Monitoring Accessory.
Functional-Safety Appliance Controller
The ATSAMDA1G15B-ABT is engineered for IEC 60730 class B white-goods safety controllers, where its dual brown-out detectors, windowed watchdog timer, and hardware CRC engine eliminate the need for external supervisor ICs. With the 48 MHz Cortex-M0+ core delivering 45 DMIPS, the MCU can scan a 7-segment user interface while simultaneously running motor-control state machines and fault diagnostics. The 32 KB Flash holds a class B self-test library plus application firmware, while 4 KB SRAM is sufficient for the diagnostic stack. Its 1.62-3.63 V supply range supports direct battery or rectified-rail operation.
Recommended
Building Automation Sensor Hub
For HVAC and lighting sensor hubs, the ATSAMDA1G15B-ABT integrates a 12-bit ADC with up to 12 channels, two analog comparators for threshold detection, and 6 SERCOM modules that can be reconfigured as I2C, SPI, or UART to talk to light, temperature, CO2, and occupancy sensors on a single bus. The Cortex-M0+ event system routes sensor triggers directly to timers without CPU wake-up, dropping average sleep current below 10 uA. Six SERCOM channels let one MCU act as the master hub for an entire room, replacing multiple 8-bit parts.
Recommended
Industrial Sensor Conditioning Module
The ATSAMDA1G15B-ABT serves as a 4-20 mA loop-powered sensor conditioner where its 12-bit ADC, 10-bit DAC, and dual comparators implement ratiometric measurement, linearization, and HART-style signaling in firmware. The Cortex-M0+ core executes 45 DMIPS, sufficient for polynomial compensation tables on a 4 KB SRAM stack. The 1.62-3.63 V supply allows direct loop operation with a 3.0 V shunt regulator. The -40C to +85C industrial temperature range meets process-plant deployment requirements.
Recommended
Low-Power Wireless Sensor Node
In LoRa/Zigbee/Thread sensor nodes, the ATSAMDA1G15B-ABT acts as the application processor while an external radio handles the link layer. The 32 KB Flash stores the wireless stack plus application logic, and the Cortex-M0+ SleepWalking peripheral event system wakes the MCU only on matched sensor events, allowing years of operation from two AA cells. The 6 SERCOM modules provide SPI to the radio, I2C to the sensor, and a UART debug port, all in a single 7x7 mm TQFP that fits in the smallest sensor puck.
Recommended
Appliance User-Interface Board
The ATSAMDA1G15B-ABT powers washing-machine, dishwasher, and oven HMI boards where it drives a 7-segment or character LCD, scans capacitive touch buttons via the 12-bit ADC, and drives triac-control outputs through its timers. Its 38 GPIO capacity handles all keypad rows, LED drivers, and buzzer control without external expanders. Functional-safety features (dual BOD, windowed WDT) ensure the appliance meets IEC 60730 class B requirements without an external supervisor.
Recommended
Safety-Conscious LED Lighting Controller
For flicker-free LED drivers and emergency lighting, the ATSAMDA1G15B-ABT generates PWM signals via its TCC timer (up to 48 MHz) to drive constant-current LED strings while monitoring battery state and mains presence. The 10-bit DAC provides analog dimming on legacy 0-10 V systems, and the dual comparators detect battery low-voltage conditions without external ICs. Functional-safety support ensures emergency-lighting units comply with IEC 62034 monitoring requirements.
Recommended
Portable Medical Monitoring Accessory
In battery-powered patient-monitoring accessories such as pulse-oximeter dongles and spirometer attachments, the ATSAMDA1G15B-ABT runs the measurement algorithm on its Cortex-M0+ core while streaming results over USB via a SERCOM. The 32 KB Flash stores firmware and calibration tables, and the 1.62-3.63 V supply supports direct lithium-cell operation. The 4 KB SRAM is sufficient for short-duration waveform buffers, and the 12-bit ADC captures sensor signals at 350 ksps.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMDA1G15B-ABT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMDA1G16B-ABT | ATSAMDA1G14B-MBT | ATSAMDA1E16B-ABT | ATSAMD21G15B-AU | ATSAMD21G15B-MU |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-TQFP (7x7x1.0 mm) | 48-TQFP (7x7x1.0 mm) - same | 48-TQFP (7x7x1.0 mm) - same | 48-TQFP (7x7x1.0 mm) - same | 48-TQFP (7x7x1.0 mm) - same | 48-TQFP (7x7x1.0 mm) - same |
| Core | ARM Cortex-M0+ 32-bit | ARM Cortex-M0+ 32-bit | ARM Cortex-M0+ 32-bit | ARM Cortex-M0+ 32-bit | ARM Cortex-M0+ 32-bit | ARM Cortex-M0+ 32-bit |
| Maximum Clock Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 32 KB | 64 KB | 16 KB | 64 KB | 32 KB | 32 KB |
| SRAM | 4 KB | 8 KB | 2 KB | 8 KB | 4 KB | 4 KB |
| Functional Safety (FuSa) | Yes (SAM DA1 family) | Yes | Yes | Yes | No (SAM D21 family) | No (SAM D21 family) |
| Packaging | Tape & Reel (TR) | Tape & Reel (TR) | Tray (MBT) | Tape & Reel (TR) | Tray (AU) | Tray (MU) |
| Operating Voltage | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V |
Key Differentiators
- Functional-safety hardware included at no extra cost (vs ATSAMD21G15B-AU)
- Lower BOM count in safety designs (vs ATSAMD21G15B-AU)
- Pin-compatible upgrade path within family (vs ATSAMDA1G14B-MBT)
Design Notes
The ATSAMDA1G15B-ABT draws roughly 7 mA active at 48 MHz from a 3.3 V supply and drops below 10 uA in STANDBY sleep with RTC running. Place a 1 uF X7R ceramic bypass capacitor on each VDD/VDDIO pin and a 100 nF decoupling cap within 5 mm of each supply pad. For battery-powered designs, use a 2.2 uF bulk cap on VDD to handle the inrush when SERCOM peripherals wake the core from SleepWalking.
Route the 48-pin TQFP with a 4-layer stackup (signal-ground-power-signal) and stitch the ground plane with 4-via fences around the SWD/SWCLK debug pins (PA30/PA31). Keep the 32.768 kHz crystal traces under 5 mm and guard them with a ground ring. The USB DP/DM differential pair (PA24/PA25) requires 90-ohm controlled impedance if USB is used.
Do not assume the SAM DA1 register map is identical to the SAM D21 - the dual-BOD registers, windowed WDT, and safety-AUX have different bit positions. Review the SAM DA1 errata (Microchip document DS80000756) for ADC gain-offset calibration, which must be loaded from SIGROW at boot when operating below 0 degrees C. Failing to enable the BOD33 in continuous mode disables the safety interrupt.
SERCOM pads can be remapped to multiple pin locations, but only one SERCOM instance may drive each GPIO at a time. Conflicting assignments cause unpredictable peripheral behavior at boot. Use Atmel START or MPLAB Harmony 3 Pin Manager to generate the SERCOM-to-PIO mapping table before laying out the PCB; reverify after any pin assignment change.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - SAM DA1 family targets IEC 60730 class B white-goods, not automotive. Lead-free reflow profile per JEDEC J-STD-020.
