LTC4100EG#PBF Linear Technology, LTC4100EG#PBF Datasheet - Page 16

IC SMART BATTERY CHARGER 24-SSOP

LTC4100EG#PBF

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

Specifications of LTC4100EG#PBF

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
SMBus Accelerator Pull-Ups
Both SCL and SDA have SMBus accelerator circuits
which reduce the rise time on systems with signifi cant
capacitance on the two SMBus signals. The dynamic pull-up
circuitry detects a rising edge on SDA or SCL and applies
1mA to 10mA pull-up to V
< V
to supply DC current). This action allows the bus to meet
SMBus rise time requirements with as much as 250pF on
each SMBus signal. The improved rise time will benefi t
all of the devices which use the SMBus, especially those
devices that use the I
pull-up circuits only pull to V
that are not compliant to the SMBus specifi cations may still
have rise time compliance problems if the SMBus pull-up
resistors are terminated with voltages higher than V
The Control Block
The LTC4100 charger operations are handled by the con-
trol block. This block is capable of charging the selected
battery autonomously or under SMBus Host control.
The control block can request communications with the
system management host (SMBus Host) by asserting
SMBALERT = 0; this will cause the SMBus Host, if present,
to poll the LTC4100.
The control block receives SMBus slave commands from
the SMBus interface block.
The control block allows the LTC4100 to meet the follow-
ing Smart Battery-controlled (Level 2) charger require-
ments:
1. Implements the Smart Battery’s critical warning mes-
2. Operates as an SMBus slave device that responds to
16
• Change of BATTERY_PRESENT in the ChargerStatus()
• Setting ALARM_INHIBITED in the ChargerStatus()
• Internal power-on reset condition.
sages over the SMBus.
ChargingVoltage() and ChargingCurrent() commands and
adjusts the charger output parameters accordingly.
DD
function.
function.
– 0.8V (external pull-up resistors are still required
2
C logic levels. Note that the dynamic
DD
DD
when V
, so some SMBus devices
IN
> 0.8V until V
DD
.
IN
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
2. AC must be present. This is qualifi ed by DCDIV >
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
charging mode.
1. A T
2. The SafetySignal is registering RES_OR.
3. The successful writing of the ChargingCurrent() AND
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 Charger-
7. The INHIBIT_CHARGE is set in the ChargerMode()
8. The CHGEN pin is pulled low by an external device. The
Battery’s ability to transmit ChargingCurrent() and
ChargingVoltage() request functions and broadcast-
ing the charging commands to the LTC4100 over the
SMBus.
warning messages without host intervention.
RES_UR.
V
RES_COLD or RES_UR.
ChargingVoltage() function. The LTC4100 will proceed
to the controlled charging mode after these two func-
tions are written.
Status() function.
function.
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
ACP
TIMEOUT
.
period is reached when the SafetySignal is
TIMEOUT
timer.
ACP
4100fb
)

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