SLLSFE4A May 2022 – December 2022 TLIN1431-Q1
PRODUCTION DATA
VSUP is the power supply pin. VSUP is connected to the battery through an external reverse battery-blocking diode (see Figure 8-3). The VSUP pin is a high-voltage-tolerant pin. Decoupling capacitors of 100 nF are recommended to be connected close to this pin to improve the transient performance. If there is a loss of power at the ECU level, the device has extremely low leakage from the LIN pin, which does not load the bus down. This is optimal for LIN systems in which some of the nodes are unpowered (ignition supplied) while the rest of the network remains powered (battery supplied). When VSUP drops low enough the regulated output drops out of regulation. The LIN bus works with a VSUP as low as 5.5 V, but at a lower voltage, the performance is indeterminate and not guaranteed. If VSUP voltage level drops enough, it triggers the UVSUP, and if it keeps dropping, at some point it passes the POR threshold.