Real-time clock integrated circuit comprising power management functions
A real time clock and power management integrated circuit consists of a) an RTC block comprising an internal clock generator for generating a system clock signal that controls a device and b) a power management block. The power management block comprises primary and backup power source connections, a Feed Power Downconverter Component, a backup power source charger power booster/regulator component to increase or regulate voltage from the primary power source to a predetermined charger input voltage, a charge control logic component, a backup power source cut-off logic component, and a mode control logic component to enable operation of the charge control logic component and the battery cut-off logic component under predetermined conditions.
1. A real time clock and power management integrated circuit consisting of:
a) an RTC block comprising an internal clock generator for generating a system clock signal that controls a device; and
b) a power management block comprising:
i) a primary power source connection for connection of the circuit to a primary power source,
ii) a backup power source connection for connection of the circuit to a backup power source,
iii) a Feed Power Downconverter Component configured to reduce voltage potential from the backup power source prior to feeding power to the RTC block by a factor of at least 3:2,
iv) a backup power source charger power booster/regulator component to increase or regulate voltage from the primary power source to a predetermined charger input voltage,
v) a charge control logic component configured to control the level of charge of the backup power source,
vi) a backup power source cut-off logic component to cease current draw on the backup power source under predetermined conditions, and
vii) a mode control logic component operably coupled to the charge control logic component and the battery cut-off logic component to enable operation of the charge control logic component and the battery cut-off logic component under predetermined conditions.
2. The real time clock and power management circuit integrated of claim 1 , wherein the components are configured for connection to a backup power source that is a rechargeable thin film microbattery.
3. The real time clock and power management circuit integrated of claim 1 , wherein the components are configured for connection to a backup power source that is a rechargeable lithium thin film microbattery.
4. The real time clock and power management circuit integrated of claim 1 , wherein the components are configured for connection to a backup power source that is a supercapacitor.
5. The real time clock and power management circuit integrated of claim 1 , wherein the Feed Power Downconverter Component is a Switch Capacitor DC-DC Downconverter Component.
6. The real time clock and power management circuit integrated of claim 1 , wherein the Feed Power Downconverter Component is configured to reduce voltage potential from the backup power source prior to feeding power to the RTC block by a factor selected from 3:1, 3:2, 4:1, or 5:1.
7. The real time clock and power management circuit integrated of claim 1 , wherein the Feed Power Downconverter Component is configured to reduce voltage potential from the primary power source and the backup power source prior to feeding power to the RTC block by a factor of at least 2:1.
8. The real time clock and power management circuit integrated of claim 1 , wherein the Feed Power Downconverter Component is configured to reduce voltage potential from the primary power source prior to feeding power to the RTC block by a factor selected from 3:1, 3:2, 4:1, or 5:1.
9. The real time clock and power management circuit integrated of claim 1 , wherein the Feed Power Downconverter Component is configured to deliver power to the RTC block at a voltage potential of from about 0.3V to about 3.3V.
10. The real time clock and power management circuit integrated of claim 1 , wherein the backup power source charger power booster/regulator component is configured to boost and/or regulate the primary supply voltage to at least 4.1V from an input voltage of ˜2.1V to 5.5V for the purpose of charging a solid state battery.
11. The real time clock and power management circuit integrated of claim 1 , wherein the backup power source charger power booster/regulator component is configured to boost and/or regulate the primary supply voltage to at least 3V-3.3V from an input voltage of ˜2.1V to 5.5V for the purpose of charging a super-capacitor or a rechargeable coin cells.
12. A copackaged unit consisting of the real time clock and power management circuit integrated of claim 1 copackaged together with a backup power source.
13. The copackaged unit of claim 12 , wherein the backup power source provided in the copackaged unit is a thin film lithium battery.