SLLS888B June 2008 – October 2016 SN65HVD1050A-Q1
PRODUCTION DATA.
Designed for operation is especially harsh environments, the SN65HVD1050A-Q1 features cross-wire, overvoltage, and loss of ground protection from –27 V to 40 V, overtemperature protection, a –12-V to 12-V common-mode range, and withstands voltage transients according to ISO 7637.
Pin 8 provides for two different modes of operation: high-speed or silent mode. The high-speed mode of operation is selected by connecting S (pin 8) to ground.
If a high logic level is applied to the S pin of the SN65HVD1050A-Q1, the device enters a listen-only silent mode during which the driver is switched off while the receiver remains fully functional.
In silent mode, all bus activity is passed by the receiver output to the local protocol controller. When data transmission is required the local protocol controller must transition the device to high speed mode by placing a logic low on the S pin to resume full operation.
A dominant time-out circuit in the SN65HVD1050A-Q1 prevents the driver from blocking network communication with a hardware or software failure. The time-out circuit is triggered by a falling edge on TXD (pin 1). If no rising edge is seen before the time-out constant of the circuit expires, the driver is disabled. The circuit is then reset by the next rising edge on TXD.
VREF (pin 5) is available as a VCC / 2 voltage reference.