THVD1406新产品！具有超强自动方向控制！

THVD1406新产品，是一款件适用于长 线缆上的多点应用。现在增加数量订货2023年3月可以发货

THVD1406新特点和优势：

? 符合或超出 TIA/EIA-485A 标准要求

? 3V 至 5.5V 电源电压

? 使用数据输入引脚的自动方向控制

? 半双工 RS-422/RS-485

? 数据速率

– THVD1406：500kbps

– THVD1426：12Mbps

? 总线 I/O 保护

– ±16kV HBM ESD

– ±12kV IEC 61000-4-2 接触放电

– ±15kV IEC 61000-4-2 空气间隙放电

– ±4kV IEC 61000-4-4 快速瞬变脉冲

? ±16V 总线故障保护

? 节省空间的小型 8 引脚 SOT 封装选项 (2.1mm x 

1.2mm)

– 请参阅布局示例，了解采用标准 SOIC-8 封装的

共同布局

? 工业级工作温度范围：-40°C 至 125°C

? 用于噪声抑制的较大接收器滞后

? 低功耗

– 低待机电源电流：3μA（典型值）

– 运行期间静态电流：1.7 mA（典型值）

? 适用于热插拔功能的无干扰上电/断电

? 开路、短路和空闲总线失效防护

? 1/8 单位负载（多达 256 个总线节点）

THVD1406应用：

? 工厂自动化和控制

? 楼宇自动化

? HVAC 系统

? 视频监控

? 智能电表

更多说明：

Robust and reliable bus node design often requires the use of external transient protection devices in order to protect against surge transients that may occur in industrial environments. Since these transients have a wide frequency bandwidth (from approximately 3 MHz to 300 MHz), high-frequency layout techniques should be applied during PCB design. 1. Place the protection circuitry close to the bus connector to prevent noise transients from propagating across the board. 2. Use VCC and ground planes to provide low inductance. Note that high-frequency currents tend to follow the path of least impedance and not the path of least resistance. 3. Design the protection components into the direction of the signal path. Do not force the transient currents to divert from the signal path to reach the protection device. 4. Apply 100-nF to 220-nF decoupling capacitors as close as possible to the VCC pins of transceiver, UART and/or controller ICs on the board. 5. Use at least two vias for VCC and ground connections of decoupling capacitors and protection devices to minimize effective via inductance. 6. Use 1-kΩ to 10-kΩ pull-up resistors for RE and SHDN lines to connect them together to VCC to reduce the number of GPIO lines to MCU or the number of isolation channels. 7. Insert pulse-proof resistors into the A and B bus lines if the TVS clamping voltage is higher than the specified maximum voltage of the transceiver bus pins. These resistors limit the residual clamping current into the transceiver and prevent it from latching up. 8. While pure TVS protection is sufficient for surge transients up to 1 kV, higher transients require metal-oxide varistors (MOVs) which reduce the transients to a few hundred volts of clamping voltage, and transient blocking units (TBUs) that limit transient current to less than 1 mA.

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深圳市雷智腾电子进出口有限公司

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