
164
8024A–AVR–04/08
ATmega8HVA/16HVA
Notes:
1. This is the absolute minimum capacitance required to ensure stable operation of the voltage regulator.
Table 28-1.
Recommended values for external devices
Symbol
Use
Parameter
Min
Typ
Max
Unit
R1
Pull-up resistor for thermistors
R
8
10
12
k
Ω
RT1/RT2
NTC Thermistor
R@25°C
8
10
12
k
Ω
B-constant
3000
4000
N/A
R
S
Source impedance when using
PA1..PA0 as V-ADC inputs
R
037
k
Ω
Worst-case Gain-error due to RS
012
%
CREF
VREF decoupling
C
1
2.2
22
F
CREG
VREG charge-storage capacitor
C
2.2
22
F
CVCC
VCC decoupling capacitor
C
0.1
F
CF1
Fly capacitors
C
220
nF
RCF/RDF
R1
k
Ω
RBATT
R1
k
Ω
RP
Cell-input LP-filter resistors
R
10
500
1000
Ω
CP
Cell-input LP-filter capacitors
C
0.01
0.1
0.5
F
RP*CP
Cell-input LP-filter time-constants
6.5
25
100
s
R
PI
Current sense LP-filter resistors
R
10
100
500
Ω
RNI
Ci
Current sense LP-filter capacitor
C
0.01
0.1
0.4
F
(R
PI+RNI)*Ci
Current sense LP-filter time-constant
10
20
s
Rsense
Coulomb Counter sense resisotor
R
10
m
Ω
τ