EFM32WG842 Datasheet, PDF (18/78 Pages) Silicon Laboratories – Operation from backup battery when main power drains out

3.6 Power Management
...the world's most energy friendly microcontrollers
The EFM32WG requires the AVDD_x, VDD_DREG and IOVDD_x pins to be connected together (with
optional filter) at the PCB level. For practical schematic recommendations, please see the application
note, "AN0002 EFM32 Hardware Design Considerations".
Table 3.6. Power Management
Symbol
V_BODextthr-
V_BODextthr+
V_PORthr+
t_RESET
C_DECOUPLE
Parameter
Condition
Min
Typ
BOD threshold on
1.74
falling external sup-
ply voltage
BOD threshold on
rising external sup-
ply voltage
Power-on Reset
(POR) threshold on
rising external sup-
ply voltage
Delay from reset
is released until
program execution
starts
Applies to Power-on Reset,
Brown-out Reset and pin reset.
Voltage regulator
decoupling capaci-
tor.
X5R capacitor recommended.
Apply between DECOUPLE pin
and GROUND
Max
Unit
1.96 V
1.85
1.98 V
1.98 V
163
µs
1
µF
3.7 Flash
Table 3.7. Flash
Symbol
Parameter
Condition
EC_FLASH
Flash erase cycles
before failure
RET_FLASH
t_{W_PROG}
T_AMB<150°C
Flash data retention T_AMB<85°C
T_AMB<70°C
Word (32-bit) pro-
gramming time
t_PERASE
Page erase time
t_DERASE
Device erase time
I_ERASE
Erase current
I_WRITE
Write current
V_FLASH
Supply voltage dur-
ing flash erase and
write
1_{Measured at 25°C}
Min
Typ
20000
Max
Unit
cycles
10000
10
20
20
h
years
years
µs
20
20.4
20.8 ms
40
40.8
41.6 ms
7¹ mA
7¹ mA
1.98
3.8 V
2014-06-13 - EFM32WG842FXX - d0196_Rev1.40
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