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AS3658F-BCTP Datasheet(PDF) 131 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) 131 Page - ams AG

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www.austriamicrosystems.com
Revision 1v13
130 - 157
AS3658
Data Sheet Confidential - Deta il ed Descri ption - System Functi ons
10.4.2 Startup from Charger
If the voltage on pin VCHARGER is within VSTARTCHARGER, the AS3658 is started (even with VBAT = 0V). This
allows the battery to be charged (even from deeply discharged batteries) and finally a normal startup to happen.
Table 139. Charger Startup Conditions
Symbol
Parameter
Min
Typ
Max
unit
Note
10.4.3 Programmable Startup Sequences—Boot ROM
The startup- and reset sequences of the device are highly configurable. The configuration of these sequences is
defined by the ratio of the internal trimmed bias resistors and RPROGRAM. At the beginning of each reset cycle a 3 bit
AD-conversion is performed. The result of this conversion is used to select 1 of 8 possible address-ranges of an
internal mask-programmable ROM. The information that is stored in this ROM defines the following parameters:
Voltage levels for all regulators and step down dcdc converters
power-on sequence of RF_1, RF_2, DIG_1, DIG_2, SD1, SD2 and SD3
duration of the reset cycle
several other configuration bits (e.g. charger)
The following values of RPROGRAM are used to select the 8 possible address ranges (8 different startup voltage /
sequences settings can be used):
000: open
001: 320k
Ω
010: 160k
Ω
011: 80k
Ω
100: 40k
Ω
101: 20k
Ω
110: 10k
Ω
111: 0
Ω
Note: For detailed startup sequences see austriamicrosystems AG document AS3658_BootROM_*.
VSTARTCHARGER
Voltage on
VCHARGER for
system to start
4.0
5.0
15
V
on Pin VCHARGER
Table 140. Boot ROM Bits definitions
Addr:107
Boot_status
These bits show the boot status
Bit
Bit Name
Default
Access
Description
2:0
rom_adr
NA
R
Boot-ROM address
3
rom_valid
1
R
If ‘1’ Boot-ROM address is valid



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