US 11,983,025 B2
Reset and safe state logic generation in dual power flow devices
Venkata Narayanan Srinivasan, Greater Noida (IN); Mayankkumar Hareshbhai Niranjani, Lathi (IN); Dhulipalla Phaneendra Kumar, Bangalore (IN); Gourav Garg, Kaithal (IN); and Sourabh Banzal, Noida (IN)
Assigned to STMICROELECTRONICS INTERNATIONAL N.V., Geneva (CH)
Filed by STMicroelectronics International N.V., Geneva (CH)
Filed on Oct. 17, 2022, as Appl. No. 17/967,498.
Application 17/967,498 is a continuation of application No. 17/537,010, filed on Nov. 29, 2021, granted, now 11,513,544.
Prior Publication US 2023/0168699 A1, Jun. 1, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G05F 1/10 (2006.01); G05F 1/46 (2006.01); G05F 3/02 (2006.01); H03K 19/20 (2006.01)
CPC G05F 1/46 (2013.01) [H03K 19/20 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of operating an electric device with dual power flow modes, the method comprising:
in a first power flow mode of the dual power flow modes, sequentially powering up a third power domain of the electric device, a second power domain of the electric device, and a first power domain of the electric device, wherein the electric device has isolation paths that provide controlled signal transmission among the first power domain, the second power domain, and the third power domain, wherein each isolation path comprises an isolation circuit coupled between an input power domain of the isolation path and an output power domain of the isolation path, with the input power domain and the output power domain being two of the first, the second, and the third power domains connected by the isolation path;
in a second power flow mode of the dual power flow modes, sequentially powering up the second power domain and the third power domain while keeping the first power domain powered on; and
generating, using a reset and safe state logic generation (RSSLG) circuit in the first power domain of the electric device, an isolation control signal for the isolation circuit in each of the isolation paths, wherein the isolation circuit is configured to allow signal transmission along the isolation path from the input power domain to the output power domain when the isolation control signal has a first value, and is configured to disable signal transmission along the isolation path when the isolation control signal has a second value.