Texas Instruments THVD4431 Multiprotocol Transceiver
Texas Instruments THVD4431 Multiprotocol (RS-232, RS-422, RS485) Transceiver supports RS-232, RS-422, and RS-485 physical layers. The highly integrated and robust multiprotocol transceiver contains three transmitters and five receivers to employ the 3T5R RS-232 port. Additionally, the THVD4431 integrates one transmitter and one receiver to enable the half and full duplex RS-485 port.
The TI THVD4431 Transceiver features integrated Level 4 IEC ESD protection, eliminating the need for external system-level protection components. Diagnostic loopback mode for RS-232 and RS-485 is equipped to check for logic-to-bus and bus-to-logic path functional integrity and cable and connector shorts. In addition, the RS-485 receiver fail-safe option 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), ideal for power-sensitive applications.
The device requires a 3V to 5.5V supply that powers the charge pump for RS-232 and the drivers/receivers for RS-232 and RS-485. A separate logic supply VIO (1.65V to 5.5V) facilitates the interface with low-level microcontrollers.
Features
- Meets or exceeds the requirements of the TIA/EIA-485A and TIA/EIA-232F standards
- Three transmitters, five receivers 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 of 250kbps and 1Mbps
- RS-485 half-duplex and full-duplex mode at 500kbps and 20Mbps
- Bus I/O protection
- ±16kV HBM ESD
- ±8kV IEC 61000-4-2 contact and ±15kV airgap discharge
- ±4kV IEC 61000-4-4 fast transient burst
- Diagnostic loopback for both RS-232 and RS-485 modes
- Shutdown pin for 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
- Extended ambient temperature range of -40°C to 125°C
- Space-saving thermally efficient 6mm x 6mm VQFN-40 package
Applications
- Industrial PC
- Factory automation and control
- HVAC systems
- Building automation
- Point-of-sale terminals
- Grid infrastructure
- Industrial transport
Associated Evaluation Module
Texas Instruments THVD4431EVM Evaluation Module
Designed to demonstrate the THVD4431 RS-485/RS-232 multiprotocol transceiver easily.
Simplified Schematic
Block Diagram
