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TXS0108E (HW-0108) 8-channel, bidirectional 5V-3.3V logic level converter
The TXS0108E (HW-0108) is an 8-channel bidirectional logic-level converter module designed to bridge communication between devices operating at different voltage levels, such as 3.3V and 5V systems. It features automatic direction sensing, meaning it does not require a dedicated direction-control signal to switch between transmitting and receiving data.
Technical Specifications
According to manufacturers like Texas Instruments and technical guides from ProtoSupplies, the module operates within the following parameters:
- Voltage Range (VCCA): 1.2V to 3.6V (Lower voltage side).
- Voltage Range (VCCB): 1.65V to 5.5V (Higher voltage side).
- Data Rates: Supports up to 110 Mbps for push-pull applications and 1.2 Mbps for open-drain applications like I2C.
- Requirement: VCCA must always be less than or equal to VCCB.
- Dimensions: Approximately 26 x 16 x 3mm.
Key Features
- Bidirectional Translation: Allows seamless two-way communication without manual configuration of data direction.
- Output Enable (OE) Pin: An active-HIGH pin that enables the device when connected to VCCA. If pulled LOW, it places all I/O pins in a high-impedance state, effectively disabling the module.
- Auto-Direction Sensing: Uses internal edge-rate accelerators to detect and automatically switch the signal direction.
Pinout and Connection Guide
The module typically features two rows of pins corresponding to the low-voltage (A) and high-voltage (B) sides:
- VCCA: Connect to the power supply of the lower voltage device (e.g., 3.3V).
- VCCB: Connect to the power supply of the higher voltage device (e.g., 5V).
- GND: Common ground for both voltage domains.
- OE: Output Enable; must be tied HIGH (to VCCA) to operate. Tie to GND via a pull-down resistor to keep it disabled during power-up.
- A1–A8: Data lines for the low-voltage side.
- B1–B8: Data lines for the high-voltage side.
An example of a level converter
Because the Arduino Uno/Nano uses 5V logic and the Ra-01 uses 3.3V, you must use a Logic Level Converter or voltage dividers on the data lines to avoid damaging the module. See more » AI-Thinker LoRA products
| Ra-01 Pin | Logic level converter | Arduino Pin (Uno/Nano) | Wire Color | Notes |
|---|---|---|---|---|
| VCC | Va - Vb | 5V | ♦ red | Power |
| GND | GND | GND | ♦ black | Common ground |
| SCK | A4 - B4 | D13 | ♦ green | SPI Clock |
| MISO | A3 - B3 | D12 | ♦ darkblue | SPI Master In Slave Out |
| MOSI | A2 - B2 | D11 | ♦ yellow | SPI Master Out Slave In |
| NSS | A1 - B1 | D10 (or D7) | ♦ lightblue | Chip Select (CS) |
| RESET | A8 - B8 | D9 (or D6) | ♦ purple | Reset Pin |
| DIO0 | A7 - B7 | D2 | ♦ orange | Interrupt Pin (Required for RX) |
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