ADP5062CP-EVALZ Analog Devices, ADP5062CP-EVALZ Datasheet - Page 19

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ADP5062CP-EVALZ

Manufacturer Part Number
ADP5062CP-EVALZ
Description
Power Management IC Development Tools ADP5062 Evaluation board
Manufacturer
Analog Devices
Type
Linear Regulators - Standardr
Series
ADP5062r
Datasheet

Specifications of ADP5062CP-EVALZ

Rohs
yes
Product
Evaluation Boards
Tool Is For Evaluation Of
ADP5062
Input Voltage
4 V to 6.7 V
Description/function
Battery charger (isolated flyback)
Interface Type
I2C
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Output Current
2.1 A
Factory Pack Quantity
1
For Use With
ADP5062
Data Sheet
Trickle Charge Mode
A deeply discharged Li-Ion cell can exhibit a very low cell voltage
making it unsafe to charge the cell at high current rates. The
ADP5062
pack protection circuit and lift the cell voltage to a safe level for
fast charging. A cell with a voltage below V
with the trickle mode current, I
mode, the CHARGER_STATUS bits are set.
During trickle charging, the ISO_Sx node is regulated to V
by the LDO and the battery isolation FET is off, which means
that the battery is isolated from the system power supply.
Trickle Charge Mode Timer
The duration of trickle charge mode is monitored to ensure that
the battery is revived from its deeply discharged state. If trickle
charge mode runs for longer than 60 minutes without the cell
voltage reaching V
charging stops. The fault condition is asserted on the CHARGER_
STATUS bits, allowing the user to initiate the fault recovery
procedure specified in the Fault Recovery section.
Weak Charge Mode (Constant Current)
When the battery voltage exceeds V
V
During the weak charge mode, the battery voltage is too low to
allow the full system to power-up. Because of the low battery
level, the USB transceiver cannot be powered and, therefore,
cannot enumerate for more current from a USB host. Conse-
quently, the USB limit remains at 100 mA.
The system microcontroller may or may not be powered by the
charger output voltage (V
of current that the microcontroller and/or the system architecture
requires. When the ISO_Sx pins power the microcontroller, the
battery charge current (I
20 mA to ensure microcontroller operation (if doing so), nor
can I
fore, set the battery charging current as follows:
WEAK
Set the default 20 mA via the linear trickle charger branch (to
ensure that the microprocessor remains alive if powered by
the main charger output, ISO_Sx). Any residual current on
the main charger output, ISO_Sx, is used to charge the
battery.
During weak current mode, other features may prevent the
weak charging current from reaching its full programmed
value. Isothermal charging mode or input current limiting for
USB compatibility can affect the programmed weak charging
current value under certain operating conditions. During
weak charging, the ISO_Sx node is regulated to V
the battery isolation FET.
CHG_WEAK
, the charger switches to intermediate charge mode.
charger uses a trickle charge mode to reset the battery
be increased above the 100 mA USB limit. There-
TRK_DEAD
CHG_WEAK
ISO_SFC
, a fault condition is assumed and
), depending upon the amount
TRK_DEAD
) cannot be increased above
TRK_DEAD
. During trickle charging
TRK_DEAD
but is less than
is charged
ISO_SFC
ISO_STRK
by
Rev. 0 | Page 19 of 44
Fast Charge Mode (Constant Current)
When the battery voltage exceeds V
charger switches to fast charge mode, charging the battery with
the constant current, I
current), the CHARGER_STATUS bits are set to 010.
During constant current mode, other features may prevent the
current, I
charging mode or input current limiting for USB compatibility
can affect the value of I
The voltage on ISO_Sx is regulated to stay at V
battery isolation FET when V
Fast Charge Mode (Constant Voltage)
As the battery charges, its voltage rises and approaches the termi-
nation voltage, V
on the BAT_SNS pin to determine when charging should end.
However, the internal ESR of the battery pack combined with
the printed circuit board (PCB) and other parasitic series
resistances creates a voltage drop between the sense point at the
BAT_SNS pin and the cell terminal. To compensate for this and to
ensure a fully charged cell, the
charging mode when the termination voltage is detected on the
BAT_SNS pin. The
the cell continues to charge, maintaining a voltage of V
BAT_SNS pin. During fast charge mode (constant voltage), the
CHARGER_ STATUS[2:0] bits are set to 011.
Fast Charge Mode Timer
The duration of fast charge mode is monitored to ensure that
the battery is charging correctly. If the fast charge mode runs
for longer than t
reaching V
The fault condition is asserted on the CHARGER_STATUS[2:0]
bits, allowing the user to initiate the fault recovery procedure as
specified in the Fault Recovery section.
If the fast charge mode runs for longer than t
been reached on the BAT_SNS pin but the charge current has
not yet fallen below I
asserted in this circumstance and charging resumes as normal if
the recharge threshold is breached.
Watchdog Timer
The
function to ensure charging is under the control of the processor.
The watchdog timer starts running when the
determines that the processor should be operational, that is,
when the processor sets the RESET_WD bit for the first time or
when the battery voltage is greater than the weak battery threshold,
V
reset regularly within the watchdog timer period, t
While in charger mode, if the watchdog timer expires without
being reset, the
problem and triggers the safety timer, t
mation see the Safety Timer section.
WEAK
ADP5062
. When the watchdog timer has been triggered, it must be
CHG
TRM
, from reaching its full programmed value. Isothermal
, a fault condition is assumed and charging stops.
charger features a programmable watchdog timer
ADP5062
TRM
CHG
. The
ADP5062
without the voltage at the BAT_SNS pin
END
CHG
CHG
, charging stops. No fault condition is
ADP5062
. During fast charge mode (constant
charger assumes that there is a software
under certain operating conditions.
ADP5062
ISO_Bx
reduces charge current gradually as
< V
charger monitors the voltage
TRK_DEAD
ISO_SFC
SAFE
enters a constant voltage
. For more infor-
and V
.
CHG
ADP5062
ISO_SFC
, and V
ADP5062
WEAK
WD
TRM
by the
.
, the
on the
TRM
charger
has

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