Overview
The FUSB251UCX, manufactured by onsemi, is an I2C controlled switch designed for over voltage protection on CC (Configuration Channel) and SBU (Side-Band Use) pins in USB Type-C interface ports. This device features SPST (Single-Pole Single-Throw) switches on CC1/2 and SBU1/2, which are automatically enabled with a valid VDD supply. This allows the Type-C/PD controller to utilize the over voltage protected CC path. The FUSB251UCX also includes a dead battery mode, where the CC ports are pulled down with a resistor (Rd) to enable a source device to provide Vbus for battery charging. Additionally, it incorporates moisture detection on both CC and SBU paths using ADC detection, generating an interrupt and updating the corresponding register to notify the host upon moisture detection.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Junction Temperature (TJ) | -40 | 150 | °C | |
| Storage Temperature (TSTG) | -65 | 150 | °C | |
| Supply Voltage (VDD) | 2.7 | 5.5 | V | |
| CC and SBU DC Tolerance | -0.5 | 24 | V | |
| Surge Protection on CC and SBU | ±35 | V | ||
| CC Switch Ron | 0.3 | Ω | ||
| SBU Switch Ron | 3 | Ω | ||
| Package Type | WLCSP, 15 ball, 3x5 array | |||
| Dimensions | 1.49 x 2.06 x 0.574 mm | |||
| Operating Temperature Range | -40 | 85 | °C |
Key Features
- Low Ron SPST switches on both CC1/2 and SBU1/2 paths for USB Type-C
- Dead battery mode with CC pulled down with Rd to allow source device to provide Vbus for battery charging
- 24 V DC tolerant on CC and SBU ports
- ±35 V surge protection on CC and SBU
- Over voltage protection on CC and SBU
- I2C interface with processor and interrupt for event notification
- Moisture detection on CC and SBU pins with ADC detection
- On-chip IEC ESD protection with external capacitor on CAP pin
- 50 MHz bandwidth on SBU switch
Applications
- Smart Phones
- Tablets, Netbooks, Ultra-Mobile PCs
- Gaming Devices and E-books
- Portable Devices with Li-ion Battery
- Car Cigarette Jack
- External USB Storage
- Outdoor Devices
Q & A
- What is the primary function of the FUSB251UCX?
The FUSB251UCX is an I2C controlled switch with over voltage protection on CC and SBU pins in USB Type-C interface ports.
- What type of switches does the FUSB251UCX have?
The device has SPST switches on CC1/2 and SBU1/2.
- What is the dead battery mode in the FUSB251UCX?
In dead battery mode, the CC ports are pulled down with a resistor (Rd) to allow a source device to provide Vbus for battery charging.
- What is the voltage tolerance of the CC and SBU ports?
Both CC and SBU ports are 24 V DC tolerant.
- Does the FUSB251UCX have surge protection?
Yes, it has ±35 V surge protection on both CC and SBU.
- How does the moisture detection feature work?
The device detects moisture on both CC and SBU paths using ADC detection, generating an interrupt and updating the corresponding register to notify the host.
- What is the package type of the FUSB251UCX?
The package type is WLCSP with a 15-ball 3x5 array.
- What is the operating temperature range of the FUSB251UCX?
The operating temperature range is -40°C to 85°C.
- What are some common applications of the FUSB251UCX?
Common applications include smart phones, tablets, gaming devices, portable devices with Li-ion batteries, and external USB storage.
- How does the I2C interface work in the FUSB251UCX?
The device includes a full I2C slave controller with interrupt for event notification.
