Power Considerations

8.1.3Battery 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.

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

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.

8.2RDK Mouse

8.2.1Usage 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.

108

CY4672 Reference Design Guide, Document # 001-16968 Revision **

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Cypress CY4672 manual RDK Mouse, Battery Life Calculations, Mode Hrs/day Days Average Icc mA Charge mAh