The 50 MHz entry-level K20 USB microcontrollers (MCUs) are the lowest power Kinetis ARM® Cortex™-M4 devices with high feature integration in a small form factor, making them ideal for space- and cost-constrained applications. These MCUs offer 32 KB to 128 KB of flash memory and optional 32 KB of FlexNVM in 32-pin QFN (5 mm x 5 mm) to 64-pin LQFP packages. Peripheral options include full-speed USB Device/Host/On-The-Go with device charge detect capability, a 16-bit analog-to-digital converter (ADC), low-power touch-sensing interface and several general timing, communication and control peripherals.
Features
Ultra-Low-Power
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11 low-power modes with power and clock gating for optimal peripheral activity and recovery times. Stop currents of <190 na="" vlls0="" run="" currents="" of="">
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Full memory and analog operation down to 1.71 volts for extended battery life
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Low-leakage wake-up unit with up to eight internal modules and 16 pins as wake-up sources in low-leakage stop (LLS)/very low-leakage stop (VLLS) modes
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Low-power timer for continual system operation in reduced power state
Flash, SRAM and FlexMemory
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32 KB-128 KB flash. Fast access, high reliability with 4-level security protection
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Up to 16 KB of SRAM
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FlexMemory: Up to 2 KB of user-segmentable byte write/erase EEPROM for data tables/system data. EEPROM with over 10M cycles and flash with 70 µsec write time (brownouts without data loss or corruption). No user or system intervention to complete programming and erase functions and full operation down to 1.71 volts. In addition, FlexNVM from 32 KB for extra program code, data or EEPROM backup.
Mixed-Signal Capability
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High-speed 16-bit ADC with configurable resolution. Single or differential output mode operation for improved noise rejection. 500 ns conversion time achievable with programmable delay block triggering
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Up to two high-speed comparators providing fast and accurate motor over-current protection by driving PWMs to a safe state
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Optional analog voltage reference provides an accurate reference to analog blocks and replaces external voltage references to reduce system cost
Performance
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50 MHz ARM® Cortex®-M4 core with DSP instruction set, single cycle MAC and single instruction multiple data (SIMD) extensions.
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Up to 4-channel DMA for peripheral and memory servicing with reduced CPU loading and faster system throughput
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Cross bar switch enables concurrent multi-master bus accesses, increasing bus bandwidth
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Independent flash banks allow concurrent code execution and firmware updating with no performance degradation or complex coding routines
Timing and Control
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Up to two FlexTimers with a total of 10 channels. Hardware dead-time insertion and quadrature decoding for motor control
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Carrier modulator timer for infrared waveform generation in remote control applications
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Four-channel 32-bit periodic interrupt timer provides time base for RTOS task scheduler or trigger source for ADC conversion and programmable delay block
Human-Machine Interface
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Hardware touch-sensing interface with up to 16 inputs. Operates in low power modes (minimum current adder when enabled). Hardware implementation avoids software polling method. High sensitivity level allows use of overlay surfaces upto 5 mm thick.
Connectivity and Communications
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Full-speed USB Device/Host/On-The-Go with device charge detect capability
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Optimized charging current/time for portable USB devices, enabling l