Datasheet
Table 37-17. Injection Current
(1)
Symbol Description min max Unit
I
inj1
(2)
IO pin injection current -1 +1 mA
I
inj2
(3)
IO pin injection current -15 +15 mA
I
injtotal
Sum of IO pins injection current -45 +45 mA
1. Injecting current may have an effect on the accuracy of Analog blocks
2. Conditions for V
pin
: V
pin
< GND-0.6V or 3.6V<V
pin
≤4.2V.
Conditions for V
DD
: 3V<V
DD
≤3.6V.
If V
pin
is lower than GND-0.6V, a current limiting resistor is required. The negative DC injection
current limiting resistor R is calculated as R = |(GND-0.6V – V
pin
)/I
inj1
|.
If V
pin
is greater than V
DD
+0.6V, a current limiting resistor is required. The positive DC injection
current limiting resistor R is calculated as R = (V
pin
-(V
DD
+0.6))/I
inj1
.
3. Conditions for V
pin
: V
pin
< GND-0.6V or V
pin
≤3.6V.
Conditions for V
DD
: V
DD
≤3V.
If V
pin
is lower than GND-0.6V, a current limiting resistor is required. The negative DC injection
current limiting resistor R is calculated as R = |(GND-0.6V – V
pin
)/I
inj2
|.
If V
pin
is greater than V
DD
+0.6V, a current limiting resistor is required. The positive DC injection
current limiting resistor R is calculated as R = (V
pin
-(V
DD
+0.6))/I
inj2
.
37.11 Analog Characteristics
37.11.1 Voltage Regulator Characteristics
Table 37-18. Voltage Regulator Electrical Characteristics
Symbol Parameter Conditions Min. Typ. Max. Units
V
DDCORE
DC calibrated output voltage Voltage regulator normal mode 1.1 1.23 1.30 V
Note: Supplying any external components using the V
DDCORE
pin is not allowed to assure the integrity of
the core supply voltage.
Table 37-19. Decoupling requirements
Symbol Parameter Conditions Min. Typ. Max. Units
C
IN
(1)
Input regulator capacitor, between V
DDIN
and GND
Ceramic dielectric X7R - 10 - µF
- 100 - nF
C
OUT
(2)
Output regulator capacitor, between
V
DDCORE
and GND
- 0.8 1 - µF
ESR Cout External Series Resistance of Cout - - 1 Ω
Note: 1. It is recommended to use ceramic X7R capacitor with low-series resistance. Refer to Figure
42-1 for a typical circuit connections of the decoupling capacitor.
SAM D21 Family
Electrical Characteristics
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 998