ZHCS603D November 2011 – April 2022 SN65HVDA100-Q1
PRODUCTION DATA
This mode is entered whenever a wake-up event occurs through LIN bus or NWake while the device is in sleep mode. The LIN bus responder termination circuit and INH are turned on when standby mode is entered. The application system powers up once INH is turned on, assuming the system is using a voltage regulator connected through INH. Standby mode is signaled through a low level on RXD.
When EN is set high while the device is in standby mode the device returns to normal mode and the normal transmission paths from TXD to LIN bus and LIN bus to RXD are enabled.
During power up if EN is low the device goes into Standby mode and if EN is high the device goes into Normal mode. EN has an internal pull-down resistor, so if the pin is floating in the system, the internal pull-down makes sure it is pulled low.
If the INH output of the SN65HVDA100-Q1 is not used to control the system power management (voltage regulators) and monitor wake-up sources, but sleep mode is used to reduce system current, the RXD pin is monitored to make sure SN65HVDA100-Q1 remains in sleep mode. If the SN65HVDA100-Q1 detects an undervoltage on VSUP, the RXD pin transitions low and signals to the software that the SN65HVDA100-Q1 is in standby mode and should be returned to sleep mode to return to the lowest power state.