US 12,222,747 B2
Methods and apparatus to facilitate safe startup of a power management unit
Michael Zwerg, Dallas, TX (US)
Assigned to Texas Instruments Incorporated, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on Mar. 31, 2023, as Appl. No. 18/129,674.
Claims priority of provisional application 63/326,303, filed on Apr. 1, 2022.
Prior Publication US 2023/0315142 A1, Oct. 5, 2023
Int. Cl. G06F 1/00 (2006.01); G06F 1/08 (2006.01); G06F 1/10 (2006.01)
CPC G06F 1/08 (2013.01) [G06F 1/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An integrated circuit comprising:
a clock generator;
processor circuitry to utilize the clock generator after a boot protocol is complete; and
power management circuitry including:
a first voltage measurement circuit including an output terminal, the first voltage measurement circuit to, after a supply voltage is above a first threshold, output a first logic value at the output terminal of the first voltage measurement circuit;
a second voltage measurement circuit including an input terminal and an output terminal, the second voltage measurement circuit to, after a first voltage at the input terminal of the second voltage measurement circuit corresponds to the first logic value and the supply voltage is above a second threshold, output the first logic value to the output terminal of the second voltage measurement circuit; and
a voltage regulator including an input terminal, a first output terminal, and a second output terminal, the voltage regulator to regulate the supply voltage to produce a second voltage; and
a third voltage measurement circuit to, after a third voltage at the input terminal of the voltage regulator corresponds to the first logic value and the second voltage is above a third threshold, enable the clock generator, the boot protocol to be complete after the clock generator is enabled.