Overview
The TCA9416DDFR is a 2-bit bidirectional I2C and SMBus voltage-level translator produced by Texas Instruments. This device is designed to interface between different logic signal levels, operating from 1.08 V to 3.6 V on both the A-side and B-side. It features an output enable (OE) input and includes rising and falling edge accelerators to enhance data transmission rates. The TCA9416 is particularly useful in applications where devices or systems operate at different interface voltages, such as in wearables, personal electronics, and servers.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOT-23-THN (DDF) | - |
| Pins | 8 | - |
| Operating Temperature Range | -40 to 125 | °C |
| Voltage Range (VCCA and VCCB) | 1.08 to 3.6 | V |
| Internal Pull-up Resistors | 10 kΩ | - |
| Ioff (when VCCA or VCCB = 0 V) | 2.5 µA | - |
| ESD Protection | 2500-V Human-body model, 1500-V Charged-device model | - |
| Latch-up Performance | Exceeds 100 mA per JESD 78, class II | - |
Key Features
- 2-bit bidirectional translator for SDA and SCL lines in I2C applications without a direction pin.
- Provides bidirectional voltage translation between 1.08 V and 3.6 V on both A and B ports.
- High-impedance output SCL_A, SDA_A, SCL_B, SDA_B pins when OE = 0 V or VCC = 0 V.
- Internal 10-kΩ pull-up resistors on all SDA and SCL pins, enabled based on respective VCC voltage.
- No power-supply sequencing required; either VCCA or VCCB can be ramped first.
- OE input can be tied directly to VCCA or controlled by GPIO.
- Rising and falling edge accelerators to speed up signal transitions.
- Compatible with standard I2C and SMBus speeds (100 kHz, 400 kHz, 1 MHz).
Applications
The TCA9416DDFR is suitable for various applications where voltage-level translation is necessary:
- Wearables: To interface devices operating at different voltage levels.
- Personal electronics: For bridging the voltage compatibility gap between different components.
- Servers: To ensure seamless communication between devices with different logic signal levels.
- Open-drain driver applications: Such as I2C or SMBus, where bidirectional data flow is required without a control signal.
Q & A
- What is the primary function of the TCA9416DDFR?
The TCA9416DDFR is a 2-bit bidirectional I2C and SMBus voltage-level translator, designed to interface between different logic signal levels.
- What is the operating voltage range of the TCA9416DDFR?
The device operates from 1.08 V to 3.6 V on both the A-side and B-side.
- Does the TCA9416DDFR require a direction pin for voltage translation?
No, the TCA9416DDFR provides bidirectional voltage translation without a direction pin.
- What is the purpose of the OE input pin?
The OE input pin can be used to disable the device by setting it low, which prevents any signals from propagating across the device.
- What are the internal pull-up resistors used for?
The internal 10-kΩ pull-up resistors are used on all SDA and SCL pins and are enabled based on the respective VCC voltage.
- Is power-supply sequencing required for the TCA9416DDFR?
No, either VCCA or VCCB can be ramped first without any sequencing requirement.
- What are the edge accelerators used for?
The rising and falling edge accelerators are used to speed up signal transitions, improving the overall data rate.
- What are the typical applications of the TCA9416DDFR?
The device is typically used in wearables, personal electronics, servers, and open-drain driver applications such as I2C or SMBus.
- What is the ESD protection level of the TCA9416DDFR?
The device has ESD protection exceeding 2500-V Human-body model and 1500-V Charged-device model.
- What is the latch-up performance of the TCA9416DDFR?
The device's latch-up performance exceeds 100 mA per JESD 78, class II.
