
554
42073A-MCU Wireless-02/13
ATmega2564/1284/644RFR2
Table 35-5. Reset, Brown-out and Internal Voltage Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Units
VRST
RSTN Pin Threshold Voltage
0.1VDD
0.9VDD
V
tRST
Minimum pulse width on RSTN Pin
200
300
ns
VHYS
Brown-out Detector Hysteresis
7.5
50
mV
tBOD
Min Pulse Width on Brown-out Reset
100
ns
VBG
Bandgap reference voltage
VDD = 3.0V, TA = 25°C
1.2
V
Table 35-6. Power-On Reset Voltage Characteristics
Symbol
Parameter
Condition
Min
(1)
Typ
(1)
Max
(1)
Units
VPOT
Power-on Reset Threshold Voltage
(rising)
(2)
Power supply discharged
1.55
1.6
1.65
V
Power-on Reset Threshold Voltage
(falling)
(3)
1.45
(4)
0.9
(5)
1.5
(4)
1.2
(5)
1.55
(4)
1.4
(5)
V
tPOT
Power-on Reset recovery time
Time of EVDD/DEVDD<VPOT
1.0
ms
VPSR
Power-on slope rate
0.01
3300
V/ms
Note:
1.
2.
3.
4.
5.
Values are guidelines only.
Threshold where device is released from reset when voltage is rising.
The Power-on Reset will not work unless the supply voltage has been below VPOT (falling).
Threshold voltage if the device is not in DEEP_SLEEP state
DEEP_SLEEP state the threshold voltage is reduced to a second level.
35.8 Power Management Electrical Characteristics
35.8.1 Power Switches
Table 35-7. Timing Characteristics of the Power Switches
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
tPOR
Power-on reset time
Applies if the device is powered up. Additional
delay may occur if slow rising power supply.
170
s
tBG
Bandgap startup time
7
s
tDRT_ON
DRT switch switch-on time
2
s
tPWRSW_ON
Power switch switch-on time
2
s
35.8.2 Voltage Regulators
Table 35-8. Timing Characteristics of the Voltage regulators
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
tAVREG
Power up time AVREG
CAVDD = 1 F
60
s
tDVREG
Power up time DVREG
Startup after Power-On
CDVDD = 100 nF
CDVDD = 1 F
40
60
s
tDVREG
Power up time DVREG
Startup after DEEP_SLEEP
CDVDD = 100 nF… 1 F
10
s