A6155

The A6155 offers a high level of integration by combining voltage regulation, voltage monitoring and software monitoring in an 8 lead package. The voltage regulator has a low dropout voltage (typ. 380 mV at 100 mA) and a low quiescent current (155 A). The quiescent current increases only slightly in dropout prolonging battery life. Built-in protection includes a positive transient absorber for up to 60 V (load dump) and the ability to survive an unregulated input voltage of 20 V (reverse battery). The input may be connected to ground or a reverse voltage without reverse current flow from the output to the input. A comparator monitors the voltage applied at the VIN input comparing it with an internal 1.275 V reference. The power-on reset function is initialized after VIN reaches 1.275 V and takes the reset output inactive after TPOR depending of external resistance. The reset output goes active low when the VIN voltage is less than 1.275 V. The RES and EN outputs are guaranteed to be in a correct state for a regulated output voltage as low as 1.2 V. The watchdog function monitors software cycle time and execution. If software clears the watchdog too quickly (incorrect cycle time) or too slowly (incorrect execution) it will cause the system to be reset. The system enable output prevents critical control functions being activated until software has successfully cleared the watchdog three times. Such a security could be used to prevent motor controls being energized on repeated resets of a faulty system. If the microcontroller does not work that means no signal on the TCL input the A6155 goes in a standby mode (CAN-bus sleep detector).