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AS3658F-BCTP Datasheet(PDF) 130 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) 130 Page - ams AG

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www.austriamicrosystems.com
Revision 1v13
129 - 157
AS3658
Data Sheet Confidential - Deta il ed Descri ption - System Functi ons
10.4
Startup
Figure 56. Startup flow chart
10.4.1 Normal Startup
During a normal reset cycle (e.g. after the battery or a charger is inserted; (see Reset generator and XON-Key on page
118)), after V2_5 is above VPOR and Vsupply is above VRESETRISE a normal startup happens:
The external capacitor on CREF is charged to 1.8V
The 3bit A/D conversion is performed to measure the external resistor value RPROGRAM
Startup State machine reads out the internal Boot-ROM (address defined by boot_ctrl), Start sequence of Step-
Down Converter and LDO’s controlled by the Boot-ROM
Reset-Timer is set by the Boot-ROM
The reset is released when the Reset Timer expires (external pin XRESET)
Power on reset
xon_enable=0
xon_enable=1 and
(chdet=0 or
USBChdet=0)
NO
Charger
detected ?
NO
YES
XON pin pulled
to GND
NO
YES
batsw_on=0
batsw_mode=0
V
BAT>VResVolt?
YES
NO
USB Sup.
detected and
ChDet=0?
NO
batsw_on=1
batsw_mode=1
Switch on
Battery switch
ChEn=1
USB_ChEn=1
YES
YES
Startup Device
V
SUPPLY>VResVolt?
NO
YES
Active state
power_off=1
YES
batsw_on=0
batsw_mode=0
force_reset=1
NO
YES
trickle
Switch on
Switch off
batsw_mode
batsw_on
0
0
1
1
1
X
NO
V
SUPPLY<VResVolt?
NO
YES
YES
batsw_on=0
batsw_mode=0
Reset registers
except
xon_enable



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