LTC4100 Linear Technology, LTC4100 Datasheet - Page 14

• Manufacturer Part Number: LTC4100
• Description: Smart Battery Charger Controller
• Manufacturer: Linear Technology

LTC4100
OPERATIO
3. The host may control charging by disabling the Smart
4. The LTC4100 will still respond to Smart Battery critical
Wake-up Charging Mode
The following conditions must be met in order to allow
wake-up charging of the battery:
1. The SafetySignal must be RES_COLD, RES_IDEAL, or
RES_UR.
2. AC must be present. This is qualified by DCDIV > V
Wake-up charging initiates when a newly inserted battery
does not send ChargingCurrent() and ChargingVoltage()
functions to the LTC4100.
The following conditions will terminate the Wake-up Charg-
ing Mode.
1. A T
RES_COLD or RES_UR.
2. The SafetySignal is registering RES_OR.
3. The successful writing of the ChargingCurrent() AND
ChargingVoltage() function. The LTC4100 will proceed to
the controlled charging mode after these two functions are
written.
4. The SafetySignal is registering RES_HOT.
5. The AC power is no longer present. (DCDIV < V
6. The ALARM_INHIBITED becomes set in the
ChargerStatus() function.
7. The INHIBIT_CHARGE is set in the ChargerMode()
function.
8. The CHGEN pin is pulled low by an external device. The
LTC4100 will resume wake-up charging, if the CHGEN pin
is released by the external device. Toggling the CHGEN pin
will not reset the T
14
Battery’s ability to transmit ChargingCurrent() and
ChargingVoltage() request functions and broadcasting
the charging commands to the LTC4100 over the SMBus.
warning messages without host intervention.
TIMEOUT
period is reached when the SafetySignal is
U
TIMEOUT
timer.
ACP
ACP
)
.
9. There is insufficient DCIN voltage to charge the battery.
The LTC4100 will resume wake-up charging when there is
sufficient DCIN voltage to charge the battery. This condi-
tion will not reset the T
Controlled Charging Algorithm Overview
The following conditions must be met in order to allow
controlled charging to start on the LTC4100:
1. The ChargingVoltage() AND ChargingCurrent() func-
tion must be written to non-zero values.
2. The SafetySignal must be RES_COLD, RES_IDEAL, or
RES_UR.
3. AC must be present. This is qualified by DCDIV > V
The following conditions will stop the Controlled Charging
Algorithm and will cause the Battery Charger Controller to
stop charging:
1. The ChargingCurrent() AND ChargingVoltage() func-
tions have not been written for T
2. The SafetySignal is registering RES_OR.
3. The SafetySignal is registering RES_HOT.
4. The AC power is no longer present. (DCDIV < V
5. ALARM_INHIBITED is set in the ChargerStatus() func-
tion.
6. INHIBIT_CHARGE is set in the ChargerMode() function.
Clearing INHIBIT_CHARGE will cause the LTC4100 to
resume charging using the previous ChargingVoltage()
AND ChargingCurrent() function values.
7. RESET_TO_ZERO is set in the ChargerMode() function.
8. CHGEN pin is pulled low by an external device. The
LTC4100 will resume charging using the previous
ChargingVoltage() AND ChargingCurrent() function val-
ues, if the CHGEN pin is released by the external device.
9. Insufficient DCIN voltage to charge the battery. The
LTC4100 will resume charging using the previous
ChargingVoltage() AND ChargingCurrent() function val-
TIMEOUT
timer.
TIMEOUT
.
sn4100 4100is
ACP
ACP
)
.