Cypress CY4672 manual Active mode-Move the mouse in a circle on white Paper

Power Considerations

8.2.2Current Measurements

The following is the results of RDK mouse current measurement:

Table 8-3. RDK keyboard Power Consumption

Operation Mode	Icc (mA) with	Icc (mA) with	Average Icc
	Supply Voltage =	Supply Voltage =
			(mA)
	2.5V	2.8V
Active mode–Move the mouse in a circle on white	8	6.9	7.5
paper.
Rest1 mode–Allow the mouse to sit idle for 1 sec-	2.03	1.81	1.92
ond after being in the active state.
Rest2 mode–Allow the mouse to sit idle for 10 sec-	0.16	0.15	0.16
onds after being in the active state.
Rest3 mode–Allow the mouse to sit idle for 10 min-	0.071	0.070	0.071
utes after being in the active state.
Not connected mode–Briefcase Mode.	0.05	0.04	0.05

8.2.3Battery Life Calculations

The following table shows the times spent in each state by the RDK mouse usage model. By substi- tuting the current measurements in section Current Measurements, the overall average Icc for RDK mouse can be calculated.

Table 8-4. RDK Mouse Power Consumption

	Mode	Hrs/day	Days	Average Icc (mA)	Charge (mAh)
	Active	1	5	7.5	37.5
Week day	Rest1	2	5	1.92	19.2
	Rest2	2	5	0.16	1.6
	Rest3	19	5	0.07	6.65
Weekend	Rest3	24	2	0.07	3.36
Charge Per Week (mAh)					68.3
Overall Average Icc (mA)					0.407

The RDK mouse 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 292 days.

CY4672 Reference Design Guide, Document # 001-16968 Revision ** 109

[+] Feedback