Infrared light emitting diode control circuit
First Claim
Patent Images
1. A system for controlling a light emitting diode (LED), the system comprising:
- a central processing unit (CPU);
a power management integrated circuit (PMIC); and
an integrated sensor hub microcontroller (ISH);
wherein the PMIC is communicatively coupled to the LED, the CPU and the ISH and is configured to;
send an activation signal to the LED in response to receipt of an enable signal from a software application executing on the CPU and responsive to determining that a disable signal from the ISH is not present; and
wherein the ISH is configured to;
generate the disable signal to the PMIC responsive to determining that a deactivation condition has been met; and
start a watchdog timer when the LED transitions from an ON state to an OFF state, wherein a running watchdog timer being the deactivation condition.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed in some examples are devices, methods, and machine-readable mediums for reliable control of IR LEDs. In some examples, a microcontroller running firmware controls whether the LED is activated or not by use of a disable signal. The microcontroller enables or disables the operation of the LED based upon a user'"'"'s proximity to the LED, a watchdog timer, and a confirmation that only trusted software is executing.
10 Citations
18 Claims
-
1. A system for controlling a light emitting diode (LED), the system comprising:
-
a central processing unit (CPU); a power management integrated circuit (PMIC); and an integrated sensor hub microcontroller (ISH); wherein the PMIC is communicatively coupled to the LED, the CPU and the ISH and is configured to; send an activation signal to the LED in response to receipt of an enable signal from a software application executing on the CPU and responsive to determining that a disable signal from the ISH is not present; and wherein the ISH is configured to; generate the disable signal to the PMIC responsive to determining that a deactivation condition has been met; and start a watchdog timer when the LED transitions from an ON state to an OFF state, wherein a running watchdog timer being the deactivation condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for controlling a light emitting diode (LED), the method comprising:
-
using a power management integrated circuit (PMIC) that is communicatively coupled to an light emitting diode (LED), a central processing unit (CPU), and an integrated sensor hub microcontroller (ISH) to; send an activation signal to the LED in response to receipt of an enable signal from a software application executing on the CPU and responsive to determining that a disable signal from the ISH is not present; and using the ISH to; generate the disable signal to the PMIC responsive to determining that a deactivation condition has been met; and start a watchdog timer when the LED transitions from an ON state to an OFF state, wherein a running watchdog timer being the deactivation condition. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
Specification