产品概览
THVD1520DR from TI is a 3.3V/5V RS-485 transceiver with +/-16kV IEC ESD and true fail-safe. 500kbps for Modbus/BACnet. 1/4 unit load = 128 nodes. Fail-safe: open/short/idle bus = HIGH.
工作原理
Differential driver converts TX to A/B bus signals. Receiver converts bus to RX. Fail-safe biases receiver threshold above 0V, so undriven bus = HIGH. DE/RE control driver/receiver enable.
Pin Description
| 针脚 | 名称 | 功能 |
|---|---|---|
| 1 | RO | Receiver output |
| 2 | RE | Rx enable (low) |
| 3 | 可选择丢弃 | Driver enable |
| 4 | DI | Driver input |
| 6 | A | Non-inverting bus |
| 7 | B | Inverting bus |
| 8 | VCC | 3.0-5.5V supply |
应用
- Modbus RTU communication
- BACnet building automation
- HVAC control buses
Alternative Models
| 制造商 | 部件编号 | 说明 |
|---|---|---|
| TI | THVD1550DR | 50Mbps version |
| ADI | ADM3077EARZ | Low-power RS-485 |