Datasheet

UVLO Mode
Shutdown Mode
Power Supply to PACK
Internal V
REG2
> 2.4 V Internal V
REG2
< 2.3 V
Power Supply to PACK
DSG: OFF
Any State
NoPowerSupply
CHG: OFF
DSG: OFF
VREG1: OFF
VREG2: OFF
XRST:LOW
I C: Disabled
UVProtection:Disabled
OV Protection: Disabled
Current Protection: Disabled
Thermal Protection: Disabled
2
CHG: OFF
DSG: OFF
VREG1: OFF
VREG2: OFF
XRST:LOW
I C: Disabled
Current Protection: Disabled
VCELL: Disabled
Watchdog: Disabled
Thermal Protection: Disabled
2
FirmwareCommand
and NoSupplytoPACK
Firmware
Command
Firmware
Command
FirmwareCommand
NoSupplyPACK
Voltage Mode
CHG: OFF
DSG: OFF
VREG1: ON
VREG2: ON
XRST:HIGH
I C:Enabled
UVProtection:Enabled
OV Protection: Enabled
Current Protection: Disabled
Thermal Protection: Enabled
2
CHG: ON
DSG: OFF
VREG1: ON
VREG2: ON
XRST:HIGH
I C:Enabled
UVProtection:Disabled
OV Protection: Enabled
Current Protection:Enabled
Thermal Protection: Enabled
2
CHG: ON
DSG: ON
VREG1: ON
VREG2: ON
XRST:HIGH
I C:Enabled
UVProtection:Enabled
OV Protection: Enabled
Current Protection:Enabled
Thermal Protection: Enabled
2
CurrentProtection Mode
DischargeSide
CHG: OFF
DSG: OFF
VREG1: ON
VREG2: ON
XRST:HIGH
I C:Enabled
UVProtection:Enabled
OV Protection: Enabled
Current Protection:Enabled
Thermal Protection: Disabled
2
Overtemperature
Protection Mode
CHG: OFF
DSG: ON
VREG1: ON
VREG2: ON
XRST:HIGH
I C:Enabled
UVProtection:Enabled
OV Protection: Disabled
Current Protection:Enabled
Thermal Protection: Enabled
2
Overvoltage
Protection Mode
Undervoltage
Protection Mode
Normal Mode
V >V orV
foraperiodof
t ort
SR OC SC
OC SC
Firmware
Command
V <V
cell UV
or
V >V
cell OV
or
AllCell Voltage> V + V
(or V – V >0.4Vand All
CellVoltage < V ),then
FirmwareCommand
UV UV
pack bat
UV
Δ
AllCell Voltage< V ,then
FirmwareCommand
OV
TurnOn T and
V <0.975V
out
IN
TurnOn T and
V >1.075V,
thenFirmware
Command
out
IN
B0327-01
bq77PL900
SLUS844B – JUNE 2008 – REVISED JANUARY 2009 ...................................................................................................................................................... www.ti.com
Figure 4. Host-Control Mode
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