Datasheet

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 kΩ
RT1/RT2 NTC Thermistor
R@25°C 8 10 12 kΩ
B-constant 3000 4000 N/A
R
S
Source impedance when using
PA1..PA0 as V-ADC inputs
R 037kΩ
Worst-case Gain-error due to R
S
012%
CREF VREF decoupling C 1 2.2 22 µF
CREG VREG charge-storage capacitor C 1.1
(1)
2.2 22 µF
CVCC VCC decoupling capacitor C 0.1 µF
CF1 Fly capacitors C 220 nF
R
CF
/R
DF
R1kΩ
R
BATT
R1kΩ
RP Cell-input LP-filter resistors R 10 500 1000 Ω
CP Cell-input LP-filter capacitors C 0.01 0.1 0.5 µF
RP*CP Cell-input LP-filter time-constants 6.5 25 100 µs
R
PI
Current sense LP-filter resistors R 10 100 500 Ω
R
NI
Ci Current sense LP-filter capacitor C 0.01 0.1 0.4 µF
(R
PI
+R
NI
)*Ci Current sense LP-filter time-constant 10 20 µs
Rsense Coulomb Counter sense resisotor R 10 mΩ
τ
τ