
555
42073A-MCU Wireless-02/13
ATmega2564/1284/644RFR2
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
IRAMPMAX
Max. load current during ramp-up
Current limitation is applied to ramp-up only.
15
mA
35.8.3 Low-Leakage Voltage Regulator
Table 35-28. Timing Characteristics of the Low-Leakage Voltage Regulator
(1,2)
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
tCAL
Calibration time
After power-on or wake-up from DEEP_SLEEP
200
s
Notes:
1. Values are guidelines only.
2. The autonomous calibration process must be completed before the device can enter DEEP_SLEEP mode. Entering
DEEP_SLEEP is only delayed if the CPU code execution until the sleep() command is shorter than tCAL. See sections
35.8.4 Deep-Sleep Mode
Table 35-10. Timing Characteristics entering Deep-Sleep Mode
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
tDS
Time to enter DEEP_SLEEP
(1)
CPU sleep() instruction to oscillator is turned off
while transceiver is already in SLEEP state
3
CLK
tDSWRC
Time from wake-up event to
CPU code execution (ISR
(3)) for
ATmega256RFR2
CPU running with 16 MHz RC oscillator clock,
wake-up with pin change interrupt
34
s
tDSWRC128K
Time from wake-up event to
CPU code execution (ISR) for
ATmega256RFR2
CPU running with 128 kHz RC oscillator clock,
wake-up with pin change interrupt
420
s
tDSWXT
Time from wake-up event to
CPU code execution (ISR) for
ATmega256RFR2
CPU running with 16 MHz crystal clock
(CKSEL = 0110), wake-up with pin change
interrupt (SUT = 00
258 clocks)
(2)
600
s
tDSWRC,TRXOFF Time from wake-up event to
TRX_OFF transceiver state for
ATmega256RFR2
CPU running with 16 MHz RC oscillator clock,
wake-up with pin change interrupt
650
s
tDSWXT,TRXOFF Time from wake-up event to
TRX_OFF transceiver state for
ATmega256RFR2
CPU running with 16 MHz crystal clock
(CKSEL = 0110), wake-up with pin change
interrupt (SUT = 00
258 clocks)
(2)
650
s
tDSWOFF,128K
Reduction of wake-up time for
ATmega128RFR2
(4)
9
s
tDSWOFF,64K
Reduction of wake-up time for
ATmega64RFR2
(4)
13
s
Note:
1. The automatic LLVREG calibration must have been completed or disabled. Se
e2. Crystal oscillator start-up times depend on CKSEL and SUT setting. See
3. ISR = Interrupt Service Routine.
4. Subtract tDSWOFF from wake-up times of device ATmega256RFR2.