FE1.1S-BSOP28BCN

@@ -0,0 +1,73 @@+# FE1.1S-BSOP28BCN++**Terminus Tech FE1 1S BSOP28BCN** · USB Converters · SSOP-28-150mil++FE1.1S-BSOP28BCN from Terminus Tech FE1 1S BSOP28BCN, in a SSOP-28-150mil. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VSS | power_in | Ground reference for the digital and analog supplies. |+| 2 | XOUT | output | 12MHz crystal oscillator output. Connects to one terminal of the 12MHz crystal (16-20pF load, 50Ω ESR max, ±50ppm). |+| 3 | XIN | input | 12MHz crystal oscillator input, or external 12MHz clock input. Integrated feedback resistor and load capacitors are provided internally. |+| 4 | DM4 | bidirectional | USB Downstream Facing Port 4 D- (differential minus). Supports High-, Full-, and Low-Speed signaling. |+| 5 | DP4 | bidirectional | USB Downstream Facing Port 4 D+ (differential plus). Supports High-, Full-, and Low-Speed signaling. |+| 6 | DM3 | bidirectional | USB Downstream Facing Port 3 D-. |+| 7 | DP3 | bidirectional | USB Downstream Facing Port 3 D+. |+| 8 | DM2 | bidirectional | USB Downstream Facing Port 2 D-. |+| 9 | DP2 | bidirectional | USB Downstream Facing Port 2 D+. |+| 10 | DM1 | bidirectional | USB Downstream Facing Port 1 D-. |+| 11 | DP1 | bidirectional | USB Downstream Facing Port 1 D+. |+| 12 | NC | unconnected | No connection. Was 1.8V power in pre-Revision B silicon; strongly recommended to leave unconnected in new designs. May be used for testing internal 1.8V level. |+| 13 | NC | unconnected | No connection. Was 3.3V power input pre-Revision B; may either be left NC or tied to pin 21 (VD33F) on the PCB for backward compatibility. |+| 14 | REXT | passive | External bias resistor pin. Connect a 2.7kΩ ±1% resistor to VSS to establish the internal bias reference. |+| 15 | DMU | bidirectional | USB Upstream Facing Port D- (differential minus). High-/Full-Speed transceiver. |+| 16 | DPU | bidirectional | USB Upstream Facing Port D+ (differential plus). Includes integrated 1.5kΩ upstream pull-up. |+| 17 | XRSTJ | input | Active-low external reset. Pull up to 3.3V for normal operation; the internal POR handles power-up. To force a reset, drive low for at least 10μs. Schmitt-trigger, 5V-tolerant. |+| 18 | VBUSM | input | Upstream port VBUS monitor. High indicates host is powered (hub operates normally); low indicates host powered down (hub enters power-down). Schmitt-trigger, 5V-tolerant. |+| 19 | BUSJ | input | Bus power sense. High = self-powered (supports high-power devices on downstream ports); low = bus-powered (each downstream port limited to 100mA). Schmitt-trigger, 5V-tolerant. |+| 20 | VDD5 | power_in | 5V power input to the integrated 5V→3.3V regulator. Leave No-Connection if an external 3.3V source is used on VD33F. |+| 21 | VD33F | power_in | 3.3V rail - filter capacitor pin for the embedded 5V→3.3V regulator, or 3.3V input from an external source when VDD5 is unused. |+| 22 | DRV/CHRGEN | bidirectional | Dual-function: LED drive control pin in normal operation; sampled at power-on-reset as Charging Hub Enable. Tie high at POR to enable the battery-charging (UCS) function; otherwise the pin functions as an LED drive output. I/O with 24mA drive strength. |+| 23 | LED1/EESCL | bidirectional | LED indicator for Ports 1 and 3 (or joint indicator when LED2/JLEDEN is strapped high at POR). Also functions as the external EEPROM I²C clock (SCL). I/O with 8mA drive strength. |+| 24 | LED2/JLEDEN | bidirectional | LED indicator for Ports 2 and 4 in normal operation; sampled at power-on-reset as Joint LED Indicator Enable - tying to 3.3V at POR enables joint port indicator mode. I/O with 8mA drive strength. |+| 25 | PWRJ | output | Active-low, open-drain power enable output for controlling downstream device power in Ganged Power Switching mode. Toggled by the host driver to limit in-rush current or in response to over-current detection. 4mA sink capability. |+| 26 | OVCJ | input | Active-low over-current sense input from an external current monitor. Asserts under Global Over-Current Protection. Schmitt-trigger, 5V-tolerant. |+| 27 | TESTJ/EESDA | bidirectional | Active-low test-mode enable at POR (factory test only - leave No-Connection in end applications) or external EEPROM I²C serial data (SDA). Open-drain output with internal pull-up, 4mA sink. |+| 28 | NC | unconnected | No connection. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Terminus Tech FE1 1S BSOP28BCN |+| Package | SSOP-28-150mil |+| Category | Interface |+| Pins | 28 |++## Ordering variants++- `FE1.1S-BSOP28BCNBSOP28BCN`+- `FE1.1S-BSOP28BCNBSOP28BCNTR`+- `FE1.1S-BSOP28BCNBQFN24B`+- `FE1.1S-BSOP28BCNBQFN24BT`+- `FE1.1S-BSOP28BCNBQFN24BV`+- `FE1.1S-BSOP28BCNBQFP48B`+- `FE1.1S-BSOP28BCNBQFP48BT`++## CAD (KiCad official)++- Symbol: `FE1.1S-BSOP28BCN`+- Footprint: `Package_SO:SSOP-28_5.3x10.2mm_P0.65mm`+- 3D model: SSOP-28-150mil (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Terminus Tech FE1 1S BSOP28BCN datasheet](docs/fe1-1s-bsop28bcn-datasheet.pdf) (22 pp, sha256 `5677873747ef908e`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/fe1-1s-bsop28bcn-datasheet.pdf)

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