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SS8000GQTR Datasheet(PDF) 9 Page - Silicon Standard Corp.

No. de pieza SS8000GQTR
Descripción Electrónicos  GSM Power-Management System
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Fabricante Electrónico  SSC [Silicon Standard Corp.]
Página de inicio  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS8000GQTR Datasheet(HTML) 9 Page - Silicon Standard Corp.

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SS8000G
APPLICATION INFORMATION (cont.)
Power Sequence and Protection Logic
The SS8000 handles the power-ON and -OFF of the
handset. It is possible to start the power-on sequence in
three different ways:
n
Pulling PWRKEY low
n
Pulling PWRBB high
n
CHRIN exceeds Chr_Det threshold
Pulling PWRKEY low is the normal way of turning on the
handset. This will turn on Vcore, Vio, Vm LDOs as long
as the PWRKEY is held low. The Vtcxo and Va LDOs
are turned on when SRCLKEN is high. The microproc-
essor then starts and pulls PWRBB high after which the
PWRKEY can be released. Pulling PWRBB high will
also turn on the handset. This is the case when the
alarm in the RTC expires.
Applying an external supply on CHRIN will also turn the
handset on. If the SS8000 is in the UVLO state, ap-
plying the adapter will not start up the LDOs.
Table 1 shows states of the handset and the LDOs
Table 1. States of Mobile Handset and LDO
Phone State
Chr_on
-UV
PWRBB (–PWRKEY)
SRCLKEN
Vrtc
Vd,Vio,Vm Va, Vtcxo
No Battery or Vbat < 2.5V
X
L
X
X
Off
Off
Off
2.5V < Vbat < 3.2V
L
L
X
X
On
Off
Off
Pre-Charging
H
L
X
X
On
Off
Off
Charger-on
H
H
X
X
On
On
On
Switched off
L
H
L
X
On
Off
Off
Stand-by
L
H
H
L
On
Off
On
Active
L
H
H
H
On
On
On
Undervoltage Lockout (UVLO)
The UVLO function in the SS8000 prevents startup
when initial voltage of the main battery is below the 3.2V
threshold. When the battery voltage is greater than 3.2V,
the UVLO comparator trips and the threshold is reduced
to 3.0V. This allows the handset to start normally until
the battery decays to below 3.0V.
Once the SS8000 enters a UVLO state, it draws very
low quiescent current, typically 30µA. The RTC LDO is
still running until the DDLO disables it. In this mode the
SS8000 draws 5µA of quiescent current.
Deep Discharge Lockout (DDLO)
The DDLO in the SS8000 has two functions:
l
To turn off the Vrtc LDO.
l
To shut down the handset when the software fails to
turn off the phone when the battery drops below 3.0V.
The DDLO will shut down the handset when the bat-
tery falls below 2.5 V to prevent further discharge and
damage to the cells.
Reset
The SS8000 contains a reset circuit that is active at
both power-up and power-down. The RESET pin is held
low at initial power-up, and the reset delay timer is
started. The delay is set by an external capacitor on
RSTCAP:
RSTCAP
RESET
C
nF
ms
2
t
×
=
(1)
At power-off, RESET will be kept low.
Over-temperature Protection
If the die temperature of the SS8000 exceeds 165°C,
the SS8000 will disable all the LDOs except the RTC
LDO. Once the over-temperature state is resolved, a
new power-on sequence is required to enable the LDOs.
Battery Charger
The SS8000 battery charger can be used with Li-ion
and NiMH batteries. The BATUSE pin can set SS8000
to fit the battery type. BATUSE is set low when a Li-ion
battery is used, and set high when a NiMH battery is
used. The SS8000 charges the battery in three phases:
pre-charging, constant current mode charging, and con-
stant voltage mode charging. Figure 2 shows the flow
chart of charger behavior. The circuitry of the SS8000
combines a PMOS transistor, diode, current-sense re-
sistor externally to form a simple and low cost linear
charger shown in Figure 3. The SS8000 provides a
pulsed top-off charging algorithm through the CHRCNTL
pin from the baseband chipset.
12/06/2004 Rev.2.10


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