# FU5821T

**Fortior Tech** · Microcontroller Units (MCUs/MPUs/SOCs) · TSSOP-16

FU5821T from Fortior Tech, in a TSSOP-16. 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 | P0.1/TIM4/SDA/TXD | bidirectional | GPIO with configurable INT0 input and open-drain output, also Timer4 I/O, I2C SDA (can be open-drain) and UART TXD open-drain output. |
| 2 | H_PU | output | 2P2N-mode pre-driver high-side U-phase output with built-in 50kΩ pull-up resistor. |
| 3 | H_PV | output | 2P2N-mode pre-driver high-side V-phase output with built-in 50kΩ pull-up resistor. |
| 4 | L_U | output | 2P2N-mode pre-driver low-side U-phase output with built-in 25kΩ pull-down resistor. |
| 5 | L_V | output | 2P2N-mode pre-driver low-side V-phase output with built-in 25kΩ pull-down resistor. |
| 6 | VCC | power_in | Power supply input, requires an external filter capacitor of 2.2μF or larger. |
| 7 | VSS | power_in | Ground. |
| 8 | VDD5 | power_in | Medium-voltage supply input or internal 5V LDO output supply, with an external 1 to 4.7μF capacitor. |
| 9 | RSTN/FICEK | input | External reset input (chip resets when low for more than 50μs) and FICE clock pin. |
| 10 | P1.2/TIM4S/TIM2/TXDS/FICED | bidirectional | GPIO with configurable INT0/INT1 input, also remapped Timer4 I/O, Timer2 I/O, remapped UART TXD output and FICE data pin. |
| 11 | P1.6/C0M/AD5 | bidirectional | GPIO with configurable INT1 input, CMP0 negative input and ADC channel 5 input. |
| 12 | P0.4/TIM2S/C0P/AD6 | bidirectional | GPIO with configurable INT0/INT1 input, remapped Timer2 I/O, CMP0 positive input and ADC channel 6 input. |
| 13 | P0.6/ISEN/AD0 | input | Input port P0.6, bus current sense input and ADC channel 0 input. |
| 14 | P0.2/HALP/AD2 | bidirectional | GPIO used for Hall logic-level input, differential Hall positive input and ADC channel 2 input. |
| 15 | P0.3/HALM/AD3 | bidirectional | GPIO, differential Hall negative input and ADC channel 3 input. |
| 16 | P1.1/TIM3/SCL/RXD/AD7 | bidirectional | GPIO with configurable INT0/INT1 input and configurable pull-up/pull-down, Timer3 I/O, I2C SCL (can be open-drain), UART RXD input (or TXD output/RXD input in single-wire mode) and ADC channel 7 input. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Fortior Tech |
| Package | TSSOP-16 |
| Category | Single Chip Microcomputer/Microcontroller |
| Pins | 16 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating ambient temperature (VCC ≤ 28V) | TA | -40 |  | 85 | ℃ | VCC ≤ 28V | 29 |
| Operating ambient temperature (VCC < 15V) | TA | -40 |  | 105 | ℃ | VCC < 15V | 29 |
| Operating junction temperature | TJ | -40 |  | 150 | ℃ |  | 29 |
| Storage temperature |  | -55 |  | 150 | ℃ |  | 29 |
| VCC voltage relative to VSS | VCC | -0.3 |  | 40 | V |  | 29 |
| VDD5 voltage relative to VSS | VDD5 | -0.3 |  | 6.5 | V |  | 29 |
| VCC operating voltage | VCC | 5 |  | 28 | V | Single supply high-voltage mode, TA = 25℃ | 29 |
| VDD5 operating voltage | VDD5 |  |  | 5.5 | V | VCC connected to VDD5 | 29 |
| System clock |  |  | 24 |  | MHz |  | 29 |
| IVCC operating current | IVCC |  | 12 |  | mA |  | 29 |
| IVCC standby current | IVCC |  | 1.5 |  | mA |  | 29 |
| IVCC sleep current | IVCC |  | 100 |  | μA |  | 29 |
| GPIO output rise time |  |  | 15 |  | ns | 50pF load, 10% to 90%, TA = 25℃ | 30 |
| GPIO output fall time |  |  | 13 |  | ns | 50pF load, 90% to 10%, TA = 25℃ | 30 |
| GPIO output low voltage | VOL |  |  | 0.7 | V | IOL = 8mA | 30 |
| GPIO pull-up resistance (other GPIO) |  |  | 35 |  | kΩ | GPIO except P0[3:1] | 30 |
| GPIO pull-up resistance P0[3:2] |  |  | 6 |  | kΩ | P0[3:2] | 30 |
| GPIO pull-down resistance P1[1] |  |  | 15 |  | kΩ | P1[1] | 30 |
| Internal fast clock frequency |  | 23.5 | 24 | 24.5 | MHz | TA = -40℃ ~ 85℃, VCC = 5V ~ 28V | 31 |
| WDT clock frequency |  | 29 | 32.8 | 37 | kHz | TA = -40℃ ~ 85℃, VCC = 5V ~ 28V | 31 |
| RSTN reset low-level minimum time |  | 50 |  |  | μs | TA = 25℃, VCC = 5V ~ 28V | 31 |
| VDD5 LDO voltage | VDD5 | 4.7 | 5 | 5.3 | V | VCC = 7V ~ 28V | 31 |
| Thermal resistance junction to ambient | θJA |  | 139 |  | ℃/W | JEDEC standard, 2S2P PCB | 31 |
| Thermal resistance junction to case | θJC |  | 43 |  | ℃/W | JEDEC standard, 1S0P PCB | 31 |

## CAD (KiCad official)

- Symbol: `FU5821T`
- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`
- 3D model: TSSOP-16 (KiCad packages3D, STEP)
- 3D model files: `fu5821t-etched.step` / `fu5821t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fu5821t.step` / `fu5821t.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Fortior Tech datasheet](docs/fu5821t-datasheet.pdf) (157 pp, sha256 `baf47c2e26fc12de`, retrieved 2026-10-23, 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`, primary `claude-sonnet-5-5` (text), consensus `claude-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).

[Datasheet PDF](docs/fu5821t-datasheet.pdf)