Texas Instruments THVD4411 Dual-Protocol Transceiver
Texas Instruments THVD4411 Dual-Protocol Transceiver is a highly integrated and robust multi-protocol transceiver supporting RS-232, RS-422, and RS-485 physical layers. The device has one transmitter and one receiver to enable the 1T1R RS-232 port. The device also integrates one receiver and one transmitter to enable half and full duplex RS-485 ports. MODE selection pins enable shared logic and bus pins for the protocols to share a common single connector. Integrated termination for RS-485 bus pins and RS-232 receiver inputs are provided so no external components are needed to realize a fully functional communication port. A slew rate select feature is available, enabling them to be used at two maximum speeds based on the SLR pin setting.
The Texas Instruments THVD4411 eliminates needing external system-level protection components with a featured integrated Level 4 IEC ESD protection. The RS-485 receiver has a fail-safe feature that drives logic high on received logic output when the bus inputs are open or shorted together or when the bus is idle. Shutdown mode consumes ultra-low current (10µA typical) in power-sensitive applications. The device needs a 3V to 5.5V supply that powers the drivers and receivers for RS-232 and RS-485 and a charge pump for RS-232. The device includes a separate logic supply VIO (1.65V to 5.5V) that enables the ability to interface with low-level microcontrollers.
Features
- Meets or exceeds the requirements of the TIA/EIA-485A and TIA/EIA-232F standards
- One transmitter, one receiver for RS-232
- One transmitter, one receiver for RS-485
- On-chip switchable 120Ω termination resistor for RS-485 mode
- Integrated charge pump for RS-232 signaling
- 3V to 5.5V supply voltage
- 1.65V to 5.5V supply for logic data and control signals
- RS-485 differential output exceeds 2.1V for PROFIBUS compatibility with a 5V supply
- Large output swing (typical ±9V) for RS-232 mode
- SLR pin selectable data rates
- RS-232 3T5R mode: 250kbps and 1Mbps
- RS-485 half-duplex and full-duplex mode: 500kbps and 20Mbps
- Bus I/O protection
- ±16kV HBM ESD
- ±8kV IEC 61000-4-2 contact and ±15kV air-gap discharge
- ±4kV IEC 61000-4-4 fast transient burst
- Shutdown pin for extremely low current consumption (10µA typical) in a disabled state
- Glitch-free power-up/down for hot plug-in capability
- 1/8 unit load (up to 256 bus nodes) for RS-485
- Open, short, and idle bus failsafe for RS-485 receiver
- Bus short-circuit protection, thermal shutdown
- -40°C to 125°C extended ambient temperature range
- Space-saving thermally efficient 4mm x 4mm VQFN-24 package
Applications
- Industrial PC
- Factory automation and control
- HVAC systems
- Building automation
- Point-of-sale terminals
- Grid infrastructure
- Industrial transport
Functional Block Diagram
Related Development Tool
Texas Instruments THVD4411EVM Evaluation Module
Allows quick prototyping of RS-485 and RS-232 multiprotocol THVD4411 transceivers.