LTC4100EG#TRPBF Linear Technology, LTC4100EG#TRPBF Datasheet - Page 15

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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OPERATION
Input: The CHARGING_VOLTAGE is an unsigned 16-bit
integer specifying the requested charging voltage in mV.
The LTC4100 considers any value from 0x0001 through
0x049F the same as writing 0x0000. The following
table defi nes the maximum permissible value of CHARG-
ING_VOLTAGE that will not set the VOLTAGE_OR in the
ChargerStatus() function for a given value of R
R
Short to GND
10kΩ ±1%
33kΩ ±1%
100kΩ ±1%
Open (or Short to V
Description: The Smart Battery, acting as a bus master
device, sends the AlarmWarning() message to the LTC4100
to notify it that one or more alarm conditions exist. Alarm
indications are encoded as bit fi elds in the Battery’s Sta-
tus register, which is then sent to the LTC4100 by this
function.
Purpose: The LTC4100 will use the information sent by
this function to properly charge the battery. The LTC4100
will only respond to certain alarm bits. Writing to this
function does not necessarily cause an alarm condition
that inhibits battery charging.
Input: Only the OVER_CHARGED_ALARM, TERMINATE
_CHARGE_ALARM, reserved (0x2000), and OVER
_TEMP_ALARM bits are supported by the LTC4100.
Writing a one to any of these specifi ed bits will inhibit
the charging by the LTC4100 and will set the ALARM_
INHIBITED bit in the ChargerStatus() function. The
TERMINATE_DISCHARGE_ALARM, REMAINING_
CAPACITY_ALARM, REMAINING_TIME_ALARM, and the
ERROR bits are ignored by the LTC4100.
Description: The SMBus Host uses this command to
determine the version number of the LTC4100 and set
extended operation modes not defi ned by the Smart Bat-
tery Charger Specifi cation.
AlarmWarning() (‘h16)
LTC0() (‘h3C)
VLIM
• SMBus Protocol: Write Word.
DD
)
Maximum ChargingVoltage()
0x54CF (21708mV)
0x6D5F (27996mV)
0x332F (13100mV)
0x43FF (17404mV)
0x225F (8796mV)
VLIM
:
Purpose: This function allows the SMBus Host to deter-
mine if the battery charger is an LTC4100. Identifying the
manufacturer and version of the Smart Battery Charger
permits software to perform tasks specifi c to a given
charger. The LTC4100 also provides a means of disabling
the LOWI current mode of the I
Input: The NO_LOWI is the only bit recognized by this
function. The default value of NO_LOWI is zero. The
LTC4100 LOWI current mode provides a more accurate
average charge current when the charge current is less
than 1/16 of the full scale I
is set, a less accurate I
the charging current, but because the charger is not pulsed
on and off, it may be preferred.
Output: The NO_LOWI indicates the I
tion. If clear, then the LOWI current mode will be used
when the charging current is less than 1/16 of the full-
scale I
The LTC Version Identifi cation will always be 0x202 for
the LTC4100.
Description: The SMBus system host uses the Alert
Response Address to quickly identify the generator of an
SMBALERT# event.
Purpose: The LTC4100 will respond to an ARA address
0x18 if the SMBALERT signal is actively pulling down the
SMBALERT# bus. The LTC4100 will follow the prioritiza-
tion reporting as defi ned in the System Management Bus
Specifi cation, Version 1.1, from the SBS Implementers
Forum.
Output: The Device Address will be sent to the SMBus
system host. The LTC4100 Device address is 0x12.
The following events will cause the LTC4100 to pull-down
the SMBALERT# bus through the SMBALERT pin:
Alert Response Address (ARA)
• SMBus Protocol: Write Word.
• SMBus Protocol: Read Word.
• SMBus Protocol: A 7-bit Addressable Device Responds
• Change of AC_PRESENT in the ChargerStatus() func-
tion.
to an ARA.
DAC
value.
DAC
DAC
algorithm is used to generate
value. When the NO_LOWI
DAC
.
DAC
LTC4100
mode of opera-
15
4100fb

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