ATR2406-PNQG Atmel, ATR2406-PNQG Datasheet - Page 21

• Manufacturer Part Number: ATR2406-PNQG
• Manufacturer: Atmel

Specifications of ATR2406-PNQG

• Operating Temperature Classification: Commercial
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Lead Free Status / Rohs Status: Compliant

4779K–ISM–06/06
A successful packet exchange needs the following amount of charge:
Q = Q1 + Q2 + Q3 + Q4 + Q5 + Q6 + Q7 + Q8 + Q9 + Q10 = 192.47 µAs
As the described system is a FHSS system with 5 different channels, the system has to do this
up to 5 times before the packet is acknowledged by the base station. The average will be 2.5
times. In case of an interfered environment, some more retries may be required, therefore it is
assumed the factor will be 3. The power-up time is included only once, as the cycle will be
completed without powering up and down the handheld in order to be as power efficient as
possible.
Note:
Average current in active mode:
Now it is assumed the system uses a small battery with a capacity of 100 mAh. This is
100.000 µAh.
The most important factor is to get the power down current as low as possible!
Example:
Assume a system, where the Handheld is used just 10 times per day.
and assuming the power down current of this device is just 4 µA.
Average current needed for a packet exchange:
System Power Down current:
Overall power consumption is 8.1 µA
Battery lifetime will be around: 12345 hours = 514 days = 1.4 years.
I
I = 0.031 µA + 4 µA = 4.03 µA
Battery lifetime will be around 24807 hours = 1033 days = 2.83 years.
Power down current is the main factor influencing the battery lifetime.
active
155 µAs + (37.5 µAs
Device will be used 1000 times a day
Current AVR:
Current ATR:
Current Vreg(+ShutDown):
Assumed average power down current is 5 µA.
Maybe very often for a light switch
= 0.031 µA
3) = 267.5 µAs
1.25 µA
1.0 µA
2.75 µA
3.1 µA
ATR2406
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