ATSAML22N17A-AUT - 32MHz M0+ 128KB Flash MCU | Microchip
MPN: ATSAML22N17A-AUT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.82 | $5.82 |
| 10 | $5.24 | $52.40 |
| 100 | $4.66 | $466.00 |
| 500 | $4.2 | $2,100.00 |
| 1,000 | $3.75 | $3,750.00 |
ATSAML22N17A-AUT Overview
An ultra-low-power microcontroller (MCU) is a class of embedded controller that integrates a CPU core, memory, and peripherals while optimizing every operating mode for minimum energy consumption. Within the semiconductor taxonomy, an MCU belongs to microcontrollers -> integrated circuits -> semiconductors. The SAM L22 family specifically targets battery-powered metering, medical, and IoT applications where the segment LCD driver eliminates the cost and current drain of an external display controller.
Key features of the ATSAML22N17A-AUT include 39 uA/MHz active current running CoreMark, a deep-sleep backup mode drawing only 490 nA with RTC retention, a 12-bit ADC, multiple SERCOM interfaces, a full-speed USB device, and a hardware segmented LCD controller with integrated charge pump. The device also provides a 32 kHz RTC, multiple timers, and an event system for low-power peripheral signaling without CPU intervention.
The architecture combines an ARM Cortex-M0+ core with single-cycle I/O access, a dedicated LCD segment driver peripheral, and a sophisticated power management unit featuring eight distinct sleep modes. The integrated charge pump allows direct biasing of 3V or 5V LCD glass from a single Li-ion cell, simplifying meter and appliance front-panel designs.
Typical applications include electricity meters, water/gas meters with LCD readouts, medical monitoring devices, industrial sensor nodes, and battery-powered IoT terminals. The combination of segment LCD, USB, and sub-microamp backup current makes the part especially well-suited to portable metering and wearable health devices.
When designing with this part, ensure that decoupling capacitance is placed within 5 mm of each VDD pin pair and that the segment LCD bias network follows the reference schematic in the datasheet. The AUT suffix indicates tape-and-reel packaging for high-volume assembly.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single decision-ready view of the ATSAML22N17A-AUT and its pin-compatible peers.
Drop-in alternatives for ATSAML22N17A-AUT — 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 ATSAML22N17A-AUT (same form factor and footprint) — differing in RoHS Status, ADC, Core, Maximum Clock Frequency, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAML22N18A-AUT
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAML22N16A-AUT
✅ Drop-In✓ In Stock
$2.85 / Unit
View Datasheet →ATSAML22J17A-AUT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ATSAM4LS2CA-AU
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →ATSAM4LS2CA-AUR
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAML22N17A-AUT Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0+ 32-bit |
| Max CPU Speed | 32 MHz |
| Program Memory (Flash) | 128 KB (128K x 8) |
| SRAM | 16 KB |
| Supply Voltage (VDD) | 1.6 V to 3.6 V |
| Active Current (CoreMark) | 39 uA/MHz |
| Backup Mode Current (RTC retained) | 490 nA |
| Operating Temperature | -40C to +85C |
| Package | 100-pin TQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| LCD Segments | Up to 320 |
| ADC | 12-bit |
| USB | Full-Speed USB Device |
| RoHS Status | Compliant |
ATSAML22N17A-AUT Pin Configuration
| Pin 1 | PA00 — GPIO / SERCOM1 PAD0 |
| Pin 2 | PA01 — GPIO / SERCOM1 PAD1 |
| Pin 3 | PA02 — GPIO / AIN0 (ADC input) |
| Pin 4 | PA03 — GPIO / AIN1 (ADC input) |
| Pin 5 | GND — Ground |
| Pin 6 | VDD — Digital supply 1.6-3.6 V |
| Pin 7 | PA04 — GPIO / AIN2 / VREF |
| Pin 8 | PA05 — GPIO / AIN3 |
| Pin 9 | PA06 — GPIO / AIN4 |
| Pin 10 | PA07 — GPIO / AIN5 |
| Pin 11 | VDDIO — I/O supply |
| Pin 12 | GND — Ground |
| Pin 13 | PA08 — GPIO / SERCOM0 PAD0 / I2S |
| Pin 14 | PA09 — GPIO / SERCOM0 PAD1 / I2S |
| Pin 15 | PA10 — GPIO / SERCOM2 PAD2 |
| Pin 16 | PA11 — GPIO / SERCOM2 PAD3 |
| Pin 17 | PA12 — GPIO / SERCOM4 PAD0 / I2S |
| Pin 18 | PA13 — GPIO / SERCOM4 PAD1 / I2S |
| Pin 19 | PA14 — GPIO / SERCOM2 PAD0 |
| Pin 20 | PA15 — GPIO / SERCOM2 PAD1 |
| Pin 21 | PA16 — GPIO / SERCOM1 PAD2 / I2S |
| Pin 22 | PA17 — GPIO / SERCOM1 PAD3 / I2S |
| Pin 23 | PA18 — GPIO / SERCOM3 PAD2 |
| Pin 24 | PA19 — GPIO / SERCOM3 PAD3 |
| Pin 25 | PA20 — GPIO / SERCOM5 PAD2 |
| Pin 26 | PA21 — GPIO / SERCOM5 PAD3 |
| Pin 27 | PA22 — GPIO / SERCOM3 PAD0 |
| Pin 28 | PA23 — GPIO / SERCOM3 PAD1 |
| Pin 29 | PA24 — GPIO / SERCOM5 PAD0 / USB D- |
| Pin 30 | PA25 — GPIO / SERCOM5 PAD1 / USB D+ |
| Pin 31 | GND — Ground |
| Pin 32 | VDD — Digital supply 1.6-3.6 V |
| Pin 33 | PA26 — GPIO |
| Pin 34 | PA27 — GPIO |
| Pin 35 | PA28 — GPIO / SEG53 LCD |
| Pin 36 | PA29 — GPIO / SEG52 LCD |
| Pin 37 | PA30 — GPIO / SWCLK (programming) |
| Pin 38 | PA31 — GPIO / SWDIO (programming) |
| Pin 39 | PB00 — GPIO / SEG51 LCD |
| Pin 40 | PB01 — GPIO / SEG50 LCD |
| Pin 41 | PB02 — GPIO / SERCOM5 PAD0 |
| Pin 42 | PB03 — GPIO / SERCOM5 PAD1 |
| Pin 43 | PB04 — GPIO / SEG49 LCD |
| Pin 44 | PB05 — GPIO / SEG48 LCD |
| Pin 45 | PB06 — GPIO / SEG47 LCD |
| Pin 46 | PB07 — GPIO / SEG46 LCD |
| Pin 47 | PB08 — GPIO / SEG45 LCD / I2S |
| Pin 48 | PB09 — GPIO / SEG44 LCD / I2S |
| Pin 49 | PB10 — GPIO / SEG43 LCD |
| Pin 50 | PB11 — GPIO / SEG42 LCD |
| Pin 51 | PB12 — GPIO / SEG41 LCD |
| Pin 52 | PB13 — GPIO / SEG40 LCD |
| Pin 53 | PB14 — GPIO / SEG39 LCD |
| Pin 54 | PB15 — GPIO / SEG38 LCD |
| Pin 55 | PC00 — GPIO / SEG37 LCD |
| Pin 56 | PC01 — GPIO / SEG36 LCD |
| Pin 57 | PC02 — GPIO / SEG35 LCD |
| Pin 58 | PC03 — GPIO / SEG34 LCD |
| Pin 59 | PC04 — GPIO / SEG33 LCD |
| Pin 60 | PC05 — GPIO / SEG32 LCD |
| Pin 61 | PC06 — GPIO / SEG31 LCD |
| Pin 62 | PC07 — GPIO / SEG30 LCD |
| Pin 63 | VDDIO — I/O supply |
| Pin 64 | GND — Ground |
| Pin 65 | PC08 — GPIO / SEG29 LCD |
| Pin 66 | PC09 — GPIO / SEG28 LCD |
| Pin 67 | PC10 — GPIO / SEG27 LCD / COM5 |
| Pin 68 | PC11 — GPIO / SEG26 LCD / COM4 |
| Pin 69 | PC12 — GPIO / SEG25 LCD / COM3 |
| Pin 70 | PC13 — GPIO / SEG24 LCD / COM2 |
| Pin 71 | PC14 — GPIO / SEG23 LCD / COM1 |
| Pin 72 | PC15 — GPIO / SEG22 LCD / COM0 |
| Pin 73 | PC16 — GPIO / SEG21 LCD |
| Pin 74 | PC17 — GPIO / SEG20 LCD |
| Pin 75 | PC18 — GPIO / SEG19 LCD |
| Pin 76 | PC19 — GPIO / SEG18 LCD |
| Pin 77 | PC20 — GPIO / SEG17 LCD |
| Pin 78 | PC21 — GPIO / SEG16 LCD |
| Pin 79 | PC22 — GPIO / SEG15 LCD |
| Pin 80 | PC23 — GPIO / SEG14 LCD |
| Pin 81 | PC24 — GPIO / SEG13 LCD |
| Pin 82 | PC25 — GPIO / SEG12 LCD |
| Pin 83 | PC26 — GPIO / SEG11 LCD |
| Pin 84 | PC27 — GPIO / SEG10 LCD |
| Pin 85 | PC28 — GPIO / SEG9 LCD |
| Pin 86 | PC29 — GPIO / SEG8 LCD |
| Pin 87 | PC30 — GPIO / SEG7 LCD |
| Pin 88 | PC31 — GPIO / SEG6 LCD |
| Pin 89 | PD00 — GPIO / SEG5 LCD |
| Pin 90 | PD01 — GPIO / SEG4 LCD |
| Pin 91 | PD02 — GPIO / SEG3 LCD |
| Pin 92 | PD03 — GPIO / SEG2 LCD |
| Pin 93 | PD04 — GPIO / SEG1 LCD |
| Pin 94 | PD05 — GPIO / SEG0 LCD |
| Pin 95 | PD06 — GPIO |
| Pin 96 | PD07 — GPIO |
| Pin 97 | VDD — Digital supply 1.6-3.6 V |
| Pin 98 | GND — Ground |
| Pin 99 | VDDCORE — Internal core supply (decouple 1uF) |
| Pin 100 | RESET — Reset input, active low |
Typical Applications
ATSAML22N17A-AUT is suitable for 6 applications: Electricity Meter with Segment LCD, Water and Gas Meter with LCD Display, Battery-Powered Medical Monitor, Industrial Sensor Node with USB Diagnostics, Wearable Health and Fitness Device, IoT Edge Node with LCD Status Display.
Electricity Meter with Segment LCD
The ATSAML22N17A-AUT is purpose-built for single-phase and three-phase electricity meters where the integrated segment LCD controller drives up to 320 segments for kWh, voltage, current, and tariff readouts. With 39 uA/MHz active current and 490 nA backup, it sustains 10+ years of battery or capacitor-backed operation. The Cortex-M0+ core runs metering algorithms and the integrated 12-bit ADC samples voltage and current channels. The same 100-pin TQFP footprint supports family migration to ATSAML22N18A-AUT for added Flash headroom.
Recommended
Water and Gas Meter with LCD Display
The ATSAML22N17A-AUT drives a 4- or 8-compartment mechanical register through its segment LCD peripheral and counts pulses from a reed switch or Hall sensor via a GPIO interrupt. The 490 nA backup mode with RTC retains time and consumption data during primary cell replacement. 128 KB Flash fits wireless M-Bus or LoRaWAN stacks when paired with an external transceiver. The 100-pin TQFP provides ample GPIO for tamper switches, optical interfaces, and valve control outputs.
Recommended
Battery-Powered Medical Monitor
The ATSAML22N17A-AUT suits portable medical devices such as glucose meters, pulse oximeters, and body temperature monitors where battery life and a clear numeric LCD display are essential. Its 12-bit ADC captures sensor data, the segment LCD shows measurement results without a separate driver IC, and the 1.6-3.6 V range accepts direct Li-ion or 2x AA cells. Hardware crypto on the J-variant or AES on the L22J enables secure patient data storage where required.
Recommended
Industrial Sensor Node with USB Diagnostics
The ATSAML22N17A-AUT integrates a full-speed USB device that engineers can use for firmware update and diagnostic logging without an external bridge IC. In industrial 4-20 mA sensor heads, the 12-bit ADC and multiple SERCOM channels (I2C/SPI/UART) connect to MEMS sensors and isolated transceivers. The wide -40C to +85C operating range supports factory-floor deployment, and the 100-pin TQFP provides a rugged leaded package for harsh environments.
Recommended
Wearable Health and Fitness Device
Wearable step counters, heart-rate monitors, and thermometer watches leverage the ATSAML22N17A-AUT for sub-microamp standby between sensor samples and an integrated segment LCD for time and metric display. The 32 MHz Cortex-M0+ executes BLE stack stubs and HRM algorithms within 39 uA/MHz, while 490 nA backup mode keeps the RTC alive overnight. The 100-pin TQFP package suits small form-factor wearable PCBs where exposed lead reliability matters.
Recommended
IoT Edge Node with LCD Status Display
IoT edge devices such as smart thermostats, room controllers, and HVAC user interfaces benefit from the ATSAML22N17A-AUT's segment LCD up to 320 segments and multiple SERCOM channels for sensor and radio connectivity. The Cortex-M0+ runs FreeRTOS or ASF firmware, the 128 KB Flash holds TCP/IP and MQTT stacks, and the 1.6-3.6 V range accepts 3.3 V system rails directly. The 100-pin TQFP is convenient for hand-soldered prototypes and production assemblies alike.
Recommended
Recommended Products Summary
Engineering reference data for ATSAML22N17A-AUT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAML22N18A-AUT | ATSAML22N16A-AUT | ATSAML22J17A-AUT | ATSAM4LS2CA-AU |
|---|---|---|---|---|---|
| Package | TQFP-100 (14x14) | TQFP-100 (14x14) - same | TQFP-100 (14x14) - same | TQFP-100 (14x14) - same | TQFP-100 (14x14) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M4F |
| Max Clock | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 48 MHz |
| Flash | 128 KB | 256 KB | 64 KB | 128 KB | 128 KB |
| SRAM | 16 KB | 32 KB | 8 KB | 16 KB | 32 KB |
| LCD Segments | 320 | 320 | 320 | 320 | None |
| Active Current | 39 uA/MHz | 39 uA/MHz | 39 uA/MHz | 39 uA/MHz | 90 uA/MHz |
| Backup Current | 490 nA | 490 nA | 490 nA | 490 nA | 1500 nA |
Key Differentiators
- Integrated segment LCD controller with 320 segments (vs ATSAM4LS2CA-AU)
- Sub-500 nA backup mode with RTC retention (vs ATSAM4LS2CA-AU)
- Scalable Flash footprint across the SAM L22 family (vs ATSAML22N18A-AUT)
Design Notes
Place a 1uF X7R ceramic decoupling capacitor within 5 mm of the VDDCORE pin (pin 99) and a 100 nF X7R within 5 mm of each VDD/VDDIO pair (pins 6, 11, 32, 63, 97). The VDDCORE pin is internally regulated and must not be driven externally. Use a star-ground topology connecting all GND pins to a single copper pour under the TQFP thermal pad to avoid ground bounce during LCD charge-pump switching.
The segment LCD charge pump uses external VLCD and HPM pins; consult the reference schematic in the SAM L22 datasheet section 'LCD Controller'. Using incorrect reservoir capacitor values (< 1uF) on HPM causes ghosting segments. Do not enable the LCD controller before configuring the GPIO mux for SLCD_COM and SLCD_SEG functions, otherwise the segment pins default to GPIO and can drive the LCD glass incorrectly.
Route the USB DP and DM pair (PA24, PA25) as a 90-ohm differential pair with length matching within 2 mm. Place the 27 ohm series damping resistors close to the MCU side and keep the pair away from switching power traces. For PCB layout, fan out the 100-pin TQFP on both sides with 0.2 mm trace width minimum to reach inner escape layers; the 14x14 mm package offers generous routing channels for 4-layer stack-ups.
Compliance Information
RoHS and REACH compliance per Microchip product page. Industrial temperature grade -40C to +85C; not AEC-Q100 qualified (use ATSAML22N17A-AUT automotive variant for vehicle applications if available).
