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108 CY4672 Reference Design Guide, Document # 001-16968 Revision **
Power Considerations
8.1.3 Battery Life Calculations
The following table shows the times spent in each state by the RDK keyboard usage model. By sub-
stituting the current measurements in section Current Measurements on page 107, the overall aver-
age Icc for RDK keyboard can be calculated.
The RDK keyboard uses two AA battery cells and enables the PMU function. Therefore, it is able to
access approximately a 2850-mAh battery capacity, which yields a battery life estimate of 841 days.
8.2 RDK Mouse
8.2.1 Usage Model
The following usage model are considered for the RDK mouse.
■ 1 hour per day with the 3030/3040 sensor in ‘active’ state.
■ 2 hours per day with the 3030/3040 sensor in ‘rest1’ state.
■ 2 hours per day with the 3030/3040 sensor in ‘rest2’ state.
■ 19 hours per day with the 3030/3040 sensor in ‘rest3’ state.
■ 5 days per week as above, 2 days per week 24 hours in ‘rest3’ state.
Table 8-2. Mouse Current Measurement
Mode Hrs/day Days Average Icc (mA) Charge (mAh)
Week day
Active 4 5 0.89 17.8
Idle 20 5 0.04 4
Weekend Idle 24 2 0.04 1.92
Charge Per Week (mAh) 23.72
Overall Average Icc (mA) 0.141
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