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The NuMicro? NUC121/125 series is a 32-bit microcontroller ( MCU ) with ARM? Cortex?-M0 core. It runs up to 50 MHz and supports 32 KB Flash, 8 KB SRAM , 12-bit ADC , 48 MHz high speed RC oscillator supporting crystal-less USB transfer and 24-ch PWM /B PWM which makes it powerful in USB communication and data control-processing. The NUC121/NUC125 series supports industrial operating temperature from - 40 ℃ to 105 ℃ , wide range power supply from 2.5V to 5.5V , and high noise immunity ( 8 kV ESD, 4 kV EFT ) . The available packages are QFN33, LQFP48 and LQFP64.

In addition to the rich features of NUC121, NUC125 supports independent VDDIO pin and voltage adjustable interface ( VAI ) with individual I/O ( 1.8V - 5.5V ) connecting to the external components with different voltage ranges to allow more flexibility in designs.

The NUC121/125 series also embedded an extra SPROM ( Security Protection ROM ) , providing a secure code execution area to protect the intelligent property of developers. 

Target Application:

USB Composite Device, Gaming Mouse/Keyboard/Pad, USB Type-C Earphone, Industrial Automation, IoT device, etc.

Key Features:

?Core
 -ARM? Cortex?-M0 core
 -Maximum frequency: 50 MHz
 -Single-cycle 32-bit hardware multiplier
  
?Memory
 -32 KB application ROM ( APROM )
 -4.5 KB Flash for loader ( LDROM )
 -512 B Security Protection ROM ( SPROM )
 -8 KB embedded SRAM supports PDMA mode
 -Configurable Data Flash
 -Supports program update by:
  • ISP ( In-System Programming )
  • ICP ( In-Circuit Programming )
  • IAP ( In-Application Programming )
  
?PDMA ( Peripheral DMA )
 -5 independent configurable channels
 -Single and burst transfer type
  
? ADC
 -Supports 12-bit SAR ADC
 -Up to 12 single-end analog input channels or 6 differential channels
 -Supports PDMA transfer
  
?  PWM /B PWM
 -24-ch PWM /B PWM /Capture maximum clock frequency up to 100 MHz
 -PWM /B PWM supports trigger ADC on three kinds of events
 -PWM supports brake function
  
?Connectivity
 -Up to one USCI interface could be set as UART , SPI , I?C mode
 -Up to one UART , one SPI /I?S and two I?C for independent set
 -Crystal-less USB 2.0 FS
  
?Clock Control
 -48 MHz internal RC ( HI RC )
 -10 kHz internal RC ( LI RC )
 -4-24 MHz external crystal ( HXT )
 -32.768 kHz external crystal ( LXT )
 -PLL up to 100 MHz
  
?Voltage Adjustable Interface
 -User Configurable 1.8- 5.5V I/O Interface with a dedicated power input ( VDDIO ) ( NUC125 only )
 -Supports USCI interface ( UART , SPI , I?C mode )
  • One built-in temperature sensor with 1 ℃ resolution
  • Operating Voltage: 2.5- 5.5V
  • Operating Temperature: - 40 ℃ -105 ℃
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