LTC4100EG#TRPBF Linear Technology, LTC4100EG#TRPBF Datasheet - Page 14

IC SMART BATTERY CHARGER 24-SSOP

LTC4100EG#TRPBF

Manufacturer Part Number
LTC4100EG#TRPBF
Description
IC SMART BATTERY CHARGER 24-SSOP
Manufacturer
Linear Technology
Datasheet

Specifications of LTC4100EG#TRPBF

Function
Charge Management
Battery Type
Smart Batteries
Voltage - Supply
6 V ~ 28 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-SSOP (0.200", 5.30mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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LTC4100
OPERATION
The RES_COLD bit is set only when the SafetySignal re-
sistance value is greater than 28.5kΩ. The SafetySignal
indicates a cold battery. The RES_COLD bit will be set
whenever the RES_OR bit is set.
The RES_HOT bit is set only when the SafetySignal resis-
tance is less than 3150Ω, which indicates a hot battery.
The RES_HOT bit will be set whenever the RES_UR bit
is set.
The RES_UR bit is set only when the SafetySignal resis-
tance value is less than 575Ω.
ALARM_INHIBITED bit is set if a valid AlarmWarning()
message has been received and charging is inhibited as
a result. This bit is cleared if both ChargingVoltage() and
ChargingCurrent() are rewritten to the LTC4100, power is
removed (DCDIV < V
setting of the ALARM_INHIBITED will activate the LTC4100
SMBALERT pull-down.
POWER_FAIL bit is set if the LTC4100 does not have suf-
fi cient DCIN voltage to charge the battery or if an external
device is pulling the CHGEN input signal low. Charging is
disabled whenever this bit is set. The setting of this bit
does not clear the values in the ChargingVoltage() and
ChargingCurrent() function values, nor does it necessarily
affect the charging modes of the LTC4100.
BATTERY_PRESENT is set if a battery is present other-
wise it is cleared. The LTC4100 uses the SafetySignal
in order to determine battery presence. If the LTC4100
detects a RES_OR condition, the BATTERY_PRESENT
bit is cleared immediately. The LTC4100 will not set the
BATTERY_PRESENT bit until it successfully samples the
SafetySignal twice and does not detect a RES_OR condi-
tion on either sampling. If AC is not present (e.g. DCDIV
< V
after the battery is connected to the SafetySignal. The
ChargingCurrent() and ChargingVoltage() function val-
ues are immediately cleared whenever this bit is cleared.
Charging will never be allowed if this bit is cleared. A
change in BATTERY_PRESENT will activate the LTC4100
SMBALERT pull-down.
AC_PRESENT is set if the voltage on DCDIV is greater than
V
on DCIN is suffi cient to charge the battery. A change in
14
ACP
ACP
. This does not necessarily indicate that the voltage
), this bit may not be set for up to one-half second
ACP
), or if a battery is removed. The
AC_PRESENT will activate the LTC4100 SMBALERT pull-
down.
Description: The Battery, System Host or other master
device sends the desired charging current (mA) to the
LTC4100 .
Purpose: The LTC4100 uses R
I
determine its charging current supplied to the battery. The
charging current will never exceed the maximum current
permitted by R
truncated to the granularity of the I
rent will also be reduced if the battery voltage exceeds the
programmed charging voltage.
Input: The CHARGING_CURRENT is an unsigned 16 bit
integer specifying the requested charging current in mA.
The following table defi nes the maximum permissible
value of CHARGING_CURRENT that will not set the CUR-
RENT_OR in the ChargerStatus() function for a given
value of the R
R
Short to GND
10kΩ ±1%
33kΩ ±1%
Open (or Short to V
Description: The Battery, SMBus Host or other master
device sends the desired charging voltage (mV) to the
LTC4100.
Purpose: The LTC4100 uses R
V
determine its charging voltage supplied to the battery. The
charging voltage will never be forced beyond the voltage
permitted by R
truncated to the granularity of the V
voltage will also be reduced if the battery current exceeds
the programmed charging current.
ChargingCurrent() (‘h14)
DAC
ChargingVoltage() (‘h15)
ILIM
DAC
• SMBus Protocol: Write Word.
• SMBus Protocol: Write Word.
, and the value of the ChargingCurrent() function to
, and the value of the ChargingVoltage() function to
ILIM
DD
VLIM
ILIM
) 0x0000 through 0x0FFF 0mA through 4095mA
:
. The ChargingCurrent() value will be
0x0000 through 0x0BFF 0mA through 3071mA
0x0000 through 0x03FF 0mA through 1023mA
0x0000 through 0x07FF 0mA through 2047mA
. The ChargingVoltage() value will be
ChargingCurrent()
VLIM
ILIM
, the granularity of the
DAC
, the granularity of the
. The charging cur-
DAC
. The charging
Current
4100fb

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