NXP Kinetis KL0 series ARM Cortex-M0+ MCU, MKL04Z32VFK4, 48MHz, 32KB Flash, 4KB RAM, 12-ch 12-bit ADC, 22 GPIO, 1.71-3.6V supply, -40 to 105°C, 24-VFQFN exposed pad in tray.
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Specifications
| Parameter | Value |
|---|---|
| Series | Kinetis KL0 |
| Mounting type | Surface Mount |
| Oscillator type | Internal |
| Program memory type | FLASH |
| Voltage - supply (Vcc (Vdd)) | 1.71V ~ 3.6V |
| Operating temperature | -40°C ~ 105°C (TA) |
| Speed | 48MHz |
| Package | Tray |
| RAM size | 4K x 8 |
| Core size | 32-Bit Single-Core |
| Peripherals | Brown-out Detect/Reset, DMA, LVD, POR, PWM, WDT |
| Connectivity | I²C, SPI, UART/USART |
| Number of i (O) | 22 |
| Core processor | ARM® Cortex®-M0+ |
| Case | 24-VFQFN Exposed Pad |
| Data converters | A/D 12x12b |
| Program memory size | 32KB (32K x 8) |
Frequently asked questions
Does the MKL04Z32VFK4 need an external crystal for accurate UART timing?
The MKL04Z32VFK4 runs on its internal oscillator. For basic UART at lower baud rates the internal RC is adequate, but integrators targeting 115200 baud or higher across the full -40 to 105°C range should verify the datasheet trim accuracy specification — internal RC drift at temperature is the sensitivity point, not room-temperature accuracy.
Can I implement a dual-bank bootloader on the MKL04Z32VFK4 without external memory?
No — the MKL04Z32 uses a single Flash bank with no read-while-write region. A dual-bank or secure in-place firmware update scheme requires a SPI NOR companion chip; the on-chip 32KB Flash cannot host simultaneous read and write operations. Budget external NOR Flash if OTA updates or secure boot partitioning are required.
What second-source options exist for the KL04 24-QFN footprint?
The KL05 and KL14 variants from NXP share the 4x4 mm QFN-24 footprint and are the nearest family alternatives. Firmware migration between KL04 and KL05 requires peripheral register-address verification — they are not drop-in register-equivalent. For cross-compatible drop-in sourcing, confirm the exact variant's DMA channel count and ADC channel count against your firmware assumptions before substitution.