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AS3685C
Datasheet
8 External Components
8.1 Capacitor and Resistor Selection
Use low-ESR ceramic capacitors with X7R or X5R dielectric. These capacitors allow good filtering and have a
wide temperature range. The connections of all external capacitors should be kept as short as possible. All
resistors should have a tolerance of ±1%.
8.2 Usage of PCB Wire Inductance
The inductance between the battery and pin V BAT can be used as a filter to reduce disturbance on the battery.
Instead of using one capacitor (C BAT ) it is recommended to split C BAT into C BAT1 a nd C BAT2 with the capacitance
of
C BAT1 = C BAT2 = C BAT
It is recommended to apply a minimum of 20nH (maximum 200nH) with low impedance. This inductance can be
realized on the PCB without any discrete coil. Assuming that a 1mm signal line corresponds to approximately
1nH (valid if the length (L) is significantly bigger than the width (W) of the line (L/W <10)), a line length of
20mm < L < 200mm
is recommended. The shape of the line is not important.
Figure 18 – PCB Wire Inductance Example1
L
Battery
Connector
AS3685
Pin VBAT
C BAT1
VSS
Figure 19 – PCB Wire Inductance Example2
Battery
Connector
C BAT1
VSS
L1
C BAT2
VSS
AS3685
Pin VBAT
C BAT2
VSS
L TOTAL = L
L TOTAL = L1 + 10*L2
8.3 External Component Specifications
Table 8 – External Components List
Part
C BAT 1
C FLY1 , C FLY2
C VCP
R ISET
Min
10k Ω
Value
Typ
2.2 μ F
1.0 μ F
2.2 μ F
Max
130k Ω
Tol
(Min)
+/-20%
+/-20%
+/-20%
+/-1%
Rating
(Max)
6.3V
6.3V
6.3V
Notes
Ceramic, X5R
e.g. Murata GRM21BR71A225KA01L
Ceramic, X5R
e.g. Murata GRM188R60J105K
Ceramic, X5R
e.g. Murata GRM21BR71A225KA01L
Current Set Resistor
Package
(min)
0603
0603
(0402, 0405)
0603
0201
R TXMASK
See section ‘TXMask function’
+/-1%
TXMask Set Resistor
0201
D LED
Flash Led
Notes:
1. See section ‘Usage of PCB Wire Inductance’
www.austriamicrosystems.com/AS3685
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