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AS3658F-BCTP Datasheet(PDF) 59 Page - ams AG

Part # AS3658F-BCTP
Description  Power and Audio Management Unit for Portable Devices
PDF  158 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3658F-BCTP Datasheet(HTML) 59 Page - ams AG

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www.austriamicrosystems.com
Revision 1v13
58 - 157
AS3658
Data Sheet Confidential - Detail ed Descri ption-Power Management Functions
8.9.2 Fuel Gauge
The fuel gauge circuit enables remaining capacity estimation of the battery by tracking the net current flow into and out
of the battery using a voltage-to-frequency converter.
Voltage-to-Frequency Converter
The voltage-to-frequency (VFC) converter constantly monitors the voltage drop across an external current sense
resistor Rsense connected in series between the negative battery terminal and ground. The use of an additional
external RC lowpass filter is highly recommended. Using two 4.7k
Ω resistors (Rfilt1,2) and a 1µF ceramic capacitor
(Cfilt), the filter cut-off is approximately 16.9 Hz. This filter will capture the effect of most spikes, and will thus allow the
current accumulators to accurately reflect the total charge that has gone into or out of the battery.
Table 49.
Charger Config Register
Addr:13
Charger Config
These bits configure the charger
Bit
Bit Name
Default Access
Description
2:0
ChVoltEOC
ROM
Sets the end-of-charge voltage level VCHOFF.
000b
3.90V
001b
3.95V
010b
4.00V
011b
4.05V
100b
4.10V
101b
4.15V
110b
4.20V
111b
4.25V
4:3
Vsupply_min
ROM
Regulate down battery charging current on that level of
Vsupply during trickle charging and/or linear charging, to
prevent voltage drop on vsupply:
00b
3.90V
01b
3.60V
10b
4.20V
11b
4.50V
7:5
ChVoltResume
ROM
Sets the resume voltage level VCHRES
000b
3.85V
001b
3.90V
010b
3.95V
011b
4.00V
100b
4.05V
101b
4.10V
110b
4.15V
111b
4.20V



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