component
FM33LC023U
Public Made by Adomby adom
FUDAN MICRO Other Processors and Microcontrollers (MCUs), QFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownFM33LC023U
FUDAN MICRO · Other Processors and Microcontrollers (MCUs) · QFN-32-EP(5x5)
FM33LC023U from FUDAN MICRO, in a QFN-32-EP(5x5). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | PD8 | bidirectional | GPIO that doubles as SWIO, the SWD interface data line. |
| 2 | NRST | input | Global reset pin; holding it low for more than 8 ms resets the chip, and it also wakes the chip from low-power modes. |
| 3 | PA13 | bidirectional | GPIO with UART0_RX, LPUART0_RX and ADC_IN6 functions. |
| 4 | PA14 | bidirectional | GPIO with UART0_TX, LPUART0_TX and ADC_IN7 functions. |
| 5 | PA15 | bidirectional | GPIO with WKUP0 wakeup input, SVS external supply detect input and ADC_IN10. |
| 6 | PA8 | bidirectional | GPIO with SEG0 (LCD), LPT32_CH1 and COMP2_INP1 functions. |
| 7 | PA11 | bidirectional | True open-drain GPIO that doubles as I2C SCL; it needs an external pull-up and has 20 mA sink capability. |
| 8 | PA12 | bidirectional | True open-drain GPIO that doubles as I2C SDA (and ADC_EXSAMP); it needs an external pull-up and has 20 mA sink capability. |
| 9 | PB2 | bidirectional | GPIO with WKUP2 wakeup input, UART4_RX and ATIM_CH1N functions. |
| 10 | PB3 | bidirectional | GPIO with UART4_TX and ATIM_CH2N functions. |
| 11 | PB8 | bidirectional | GPIO with SEG7 (LCD), SPI1_SSN and ATIM_CH3N functions. |
| 12 | PB9 | bidirectional | GPIO with SEG8 (LCD), ANATST analog test, SPI1_SCK and GPT0_ETR functions. |
| 13 | PB10 | bidirectional | GPIO with SEG9 (LCD), OPA1_INN1, SPI1_MISO and GPT0_CH1 functions. |
| 14 | PB11 | bidirectional | GPIO with SEG10 (LCD), OPA1_INP1, SPI1_MOSI and GPT0_CH2 functions. |
| 15 | DP | bidirectional | USB D+ data line. |
| 16 | DM | bidirectional | USB D- data line. |
| 17 | PC2 | bidirectional | GPIO with XTHIN high-frequency crystal input (4-32 MHz), UART1_RX and LPUART1_RX functions. |
| 18 | PC3 | bidirectional | GPIO with XTHOUT high-frequency crystal output, UART1_TX and LPUART1_TX functions. |
| 19 | PC4 | bidirectional | GPIO with SEG13 (LCD), OPA1_OUT and UART5_RX functions. |
| 20 | PC5 | bidirectional | GPIO with SEG14 (LCD), OPA2_OUT and UART5_TX functions. |
| 21 | PC8 | bidirectional | GPIO with SEG17 (LCD), SPI2_SCK and ADC_IN9 functions. |
| 22 | PC9 | bidirectional | GPIO with SEG18 (LCD), SPI2_MISO and ADC_IN0 functions. |
| 23 | PC10 | bidirectional | GPIO with WKUP5 wakeup input, SEG19 (LCD), SPI2_MOSI and ADC_IN1 functions. |
| 24 | PD9 | bidirectional | GPIO that doubles as XT32KO, the 32768 Hz crystal output. |
| 25 | PD10 | bidirectional | GPIO that doubles as XT32KI, the 32768 Hz crystal input. |
| 26 | VDD15 | power_out | LDO output (1.5 V core supply); connect a 100 nF capacitor to ground. |
| 27 | VSS | power_in | Ground. |
| 28 | VDD | power_in | Main power supply, 1.8 to 3.6 V when USB is used. |
| 29 | PD11 | bidirectional | GPIO with WKUP6 wakeup input, FOUT0 clock output, ATIM_BRK1 and ADC_IN2 functions. |
| 30 | PD0 | bidirectional | GPIO with SEG22 (LCD), UART5_RX and ADC_IN3 functions. |
| 31 | PD1 | bidirectional | GPIO with SEG23 (LCD), UART5_TX and ADC_IN4 functions. |
| 32 | PD7 | bidirectional | GPIO that doubles as SWCLK, the SWD interface clock. |
| 33 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | FUDAN MICRO |
| Package | QFN-32-EP(5x5) |
| Category | Embedded Processors & Controllers |
| Pins | 33 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage | VDD-VSS | -0.3 | 6.5 | V | includes VDD, VDDA | 63 | |
| Pin voltage | VPIN | -0.3 | 6.5 | V | VSS-0.3 to 6.5 | 63 | |
| Voltage difference between VDD and VDDA | /ΔVDD/ | 50 | mV | 63 | |||
| Voltage difference between all ground pins | /ΔVSS/ | 50 | mV | 63 | |||
| Operating temperature | TA | -40 | 85 | °C | 63 | ||
| Storage temperature | TSTG | -55 | 150 | °C | 63 | ||
| ESD HBM, pins other than PA11, PA12, PB12 | HBM | -8000 | 8000 | V | TA=25℃, JEDEC JS-001 | 63 | |
| ESD HBM, PA11, PA12, PB12 | HBM | -5000 | 5000 | V | TA=25℃, JEDEC JS-001 | 63 | |
| ESD CDM | CDM | -1000 | 1000 | V | TA=25℃, JEDEC JS-002 | 63 | |
| IO latchup trigger current | Itrigger | -125 | 125 | mA | -(0.5VDD) < VI < (1.5VDD), TA=25℃, JESD78E | 63 | |
| IO latchup supply voltage | Vsupply | 8.25 | V | TA=25℃, JESD78E | 63 | ||
| Max current into VDD (source) | ΣIVDD | 90 | mA | 63 | |||
| Max current out of VSS (sink) | ΣIVSS | 70 | mA | 63 | |||
| Total IO sink current | ΣIIO | 90 | mA | all IO sink | 63 | ||
| Total IO source current | ΣIIO | 70 | mA | all IO source | 63 | ||
| AHB clock frequency | fHCLK | 0 | 64 | Mhz | 64 | ||
| APB clock frequency | fPCLK | 0 | 64 | Mhz | 64 | ||
| Operating voltage (USB used) | VDD | 1.8 | 3.6 | V | BOR enabled | 64 | |
| Operating voltage (USB used) | VDD | 1.35 | 3.6 | V | BOR disabled | 64 | |
| Analog operating voltage (USB used) | VDDA | 1.8 | 3.6 | V | VDDA=VDD required | 64 | |
| Junction temperature | TJ | -40 | 105 | °C | TA=-40~+85C | 64 |
CAD (KiCad official)
- Symbol:
FM33LC023U - Footprint:
Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm - 3D model: QFN-32-EP(5x5) (KiCad packages3D, STEP)
- 3D model files:
fm33lc023u-etched.step/fm33lc023u-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);fm33lc023u.step/fm33lc023u.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: FUDAN MICRO datasheet (707 pp, sha256
6d623d96ef650faf, retrieved 2026-10-22, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).