Battery monitor with software trim
First Claim
1. A battery monitor for monitoring a voltage level of a battery in a portable telephone, the battery monitor comprising:
- means including a programmable register for generating a plurality of reference voltages as a function of data stored in the programmable register;
means for simultaneously comparing the plurality of reference voltages with the voltage level of the battery; and
wherein the comparing means generates at least one output signal when the voltage level of the battery is equal to the reference voltage.
11 Assignments
0 Petitions
Accused Products
Abstract
A battery monitor with programmable voltage references. The battery monitor includes a comparator circuit connected to a battery for receiving a voltage level thereof and to a voltage reference circuit for receiving a at least one reference voltage generated thereby. A trim circuit is connected to the voltage reference circuit for adjusting the reference voltage(s) and generated by the voltage reference circuit. The comparator circuit compares the voltage level of the battery with the reference voltage(s) generates an output based on the relative value of the battery voltage compared to the reference voltage(s). The trim circuit is programmable and includes a microprocessor connected to a programmable register and a memory. The microprocessor obtains trim data from the memory and writes the trim data to the programmable register.
36 Citations
12 Claims
-
1. A battery monitor for monitoring a voltage level of a battery in a portable telephone, the battery monitor comprising:
-
means including a programmable register for generating a plurality of reference voltages as a function of data stored in the programmable register; means for simultaneously comparing the plurality of reference voltages with the voltage level of the battery; and wherein the comparing means generates at least one output signal when the voltage level of the battery is equal to the reference voltage. - View Dependent Claims (2)
-
-
3. A battery monitor for monitoring a voltage level of a battery in a portable telephone, the battery monitor comprising:
-
a comparator circuit arranged to be coupled to the battery to receive a voltage level therefrom; a voltage reference circuit coupled to the comparator circuit, the voltage reference circuit including a band gap circuit coupled in series with a variable resistor and a voltage divider and arranged to simultaneously provide a plurality of reference voltage levels to the comparator circuit; a trim circuit, including a programmable register coupled to the variable resistor, the trim circuit arranged to adjust the contents of the programmable register, wherein the plurality of reference voltage levels are generated as a function of data stored in the programmable register; and wherein the comparator circuit is further arranged to compare the voltage level of the battery with the plurality of voltage levels and generate an output based on results of the comparison. - View Dependent Claims (4, 5, 6, 7)
-
-
8. A monitor for detecting characteristics of a battery in a portable telephone, the monitor comprising:
-
a first voltage divider coupled in parallel with the battery; a plurality of comparators coupled to the first voltage divider to receive a voltage level of the battery; a first control circuit including a programmable register;
p1 a voltage reference circuit coupled to the programmable register and to the plurality of comparators, the voltage reference circuit arranged to simultaneously generate a plurality of reference voltages to the comparators as a function of data stored in the register; andwherein the comparators are arranged to generate outputs indicative of characteristics of the battery when the battery voltage level reaches a predetermined value compared to the reference voltages. - View Dependent Claims (9, 10, 11, 12)
-
Specification