Adaptive system controlled power supply transient filter
View Patent ↗An electronic device that includes a power on reset, a variable power supply filter coupled to the power on reset, and control logic coupled to the power on reset and the variable power supply filter. The control logic is configured to activate the variable power supply filter based on a core domain of the electronic device being active.
1. An electronic device, comprising:
a power on reset;
a variable power supply filter coupled to the power on reset; and
control logic coupled to the power on reset and the variable power supply filter, the control logic configured to transmit a control signal to the variable power supply filter causing the variable power supply filter to adjust a bandwidth of the variable power supply filter based on a core domain of the electronic device being active.
2. The system of claim 1 , wherein the variable power supply filter is a low pass filter.
3. The system of claim 1 , wherein the control signal causes the bandwidth of the variable power supply filter to lower based on the core domain of the electronic device being active.
4. The system of claim 3 , wherein the bandwidth of the variable power supply filter is lowered such that power transients are damped by the variable power supply filter.
5. The system of claim 1 , wherein, based on the core domain of the electronic device being inactive, the variable power supply filter is set with a bandwidth such that power transients are not damped by the variable power supply filter.
6. The system of claim 1 , wherein the control logic is programmable.
7. The system of claim 1 , wherein the electronic device is a microcontroller.
8. The system of claim 1 , wherein the power on reset is configured to reset the electronic device when a threshold amount of power is applied to the power on reset.
9. A method, comprising:
receiving a power on reset impulse;
resetting an electronic device; and
based on a core domain of the electronic device being active, adjusting a bandwidth of a power supply filter coupled to a power on reset to a first state.
10. The method of claim 9 , wherein the adjusting the bandwidth of the power supply filter to a first state comprises lowering the bandwidth of the power supply filter such that power transients are damped by the power supply filter.
11. The method of claim 9 , further comprising, based on the core domain of the electronic device being inactive, adjusting the bandwidth of the power supply filter to a second state.
12. The method of claim 11 , wherein the adjusting the bandwidth of the power supply filter to a second state comprises raising the bandwidth such that power transients are not damped by the power supply filter.
13. The method of claim 9 , wherein the electronic device is a microcontroller.
14. The method of claim 9 , further comprising, receiving, by the power on reset, power, and wherein the resetting the electronic device comprises resetting the electronic device based on the power on reset receiving a threshold amount of power.
15. A system comprising:
a low pass filter;
a power on reset coupled to the low pass filter, the power on reset configured to reset an electronic device;
a voltage reference coupled to the low pass filter and power on reset, the voltage reference configured to produce a fixed voltage; and
control logic coupled to the power on reset, low pass filter, and voltage reference, the control logic configured to transmit a control signal to the low pass filter causing the low pass filter to adjust a bandwidth of the low pass filter based on the voltage reference producing the fixed voltage.
16. The system of claim 15 , wherein the control signal causes the bandwidth of the low pass filter to lower based on the voltage reference producing the fixed voltage such that power transients are damped by the low pass filter.
17. The system of claim 15 , wherein, based on the voltage reference not producing the fixed voltage, the low pass filter is set with a bandwidth such that power transients are not damped by the low pass filter.
18. The system of claim 15 , wherein the threshold amount of time is programmable.
19. The system of claim 15 , wherein the electronic device is a microcontroller.
20. The system of claim 15 , wherein the power on reset is configured to reset the electronic device based on a threshold amount of power being applied to the power on reset.