Data Sheet

FSC-BT806BDatasheet
Shenzhen Feasycom Technology Co.,Ltdwww.feasycom.com
-12-
4. PHYSICAL INTERFACE
4.1 Power Management
4.1.1 Power Supply
The transient response of the regulator is important. If the power rails of the module are supplied from an external
voltage source, the transient response of any regulator used should be 20μs or less. It is essential that the power rail
recovers quickly.
4.1.2Battery Charger
4.1.2.1Battery Charger Hardware Operating Modes
The default mode for the FSC-BT806BB battery charger is OFF.
The internal charger circuit can provide up to 200mA of charge current.
The battery charger hardware is controlled by the VM, see picture below.The battery charger has 5 modes:
Disabled
Trickle charge
Fast charge
Standby: fully charged or float charge
Error: charging input voltage, VCHG, is too low
The battery charger operating mode is determined by the battery voltage and current, see the table below and the
picture below.
Table 3: Battery Charger Operating Modes Determined by Battery Voltage and Current
Parameter
Battery Charger Enabled
VBAT_SENSE(internal)
Off
No
X
Trickle charge
Yes
>0 and <V
fast
Fast charge
Yes
>V
fast
and <V
float
Standby
Yes
I
term
(a)
and >(V
float
- V
hyst
)
Error
Yes
>(VCC_CHG - 50mV)
(a)I
term
is 10% of I
fast
for a given I
fast
setting
The picture belowshows the mode-to-mode transition voltages. These voltages are fixed and calibrated. The transition
between modes can occur at any time.