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Contents

Pinout
Key specifications
Ordering variants
CAD (KiCad official)
3D model downloads
Provenance

README

markdown

FE1.1S-BSOP28BCN

Terminus Tech · USB Converters · SSOP-28-150mil

FE1.1S-BSOP28BCN from Terminus Tech, 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
Package	SSOP-28-150mil
Category	Interface
Pins	28

Ordering variants

Same part, different packaging or reel option.

FE1.1S-BSOP28BCN
FE1.1S-BSOP28BCNTR
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)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`fe1-1s-bsop28bcn.step`	362 KB	You want the bare part, or you mark your own boards.
`fe1-1s-bsop28bcn-etched.step`	4.0 MB	You want the part with `FE1.1S-BSOP28BCN` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 989 faces against 447 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: Terminus Tech datasheet (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