ltc1760 Linear Technology Corporation, ltc1760 Datasheet - Page 10

• Manufacturer Part Number: ltc1760
• Description: Dual Smart Battery System Manager
• Manufacturer: Linear Technology Corporation

PI FU CTIO S
LTC1760
10
DCDIV (Pin 16): DCDIV Comparator Input from External
Resistor Divider Connected from DCIN to GND. If the
voltage at DCDIV pin is above the DCDIV comparator
threshold, then the AC_PRESENT bit is set and the wall
adapter power is considered to be adequate to charge the
batteries. If DCDIV is taken more than 1.8V above V
then all of the power path switches are latched off until all
power is removed.
DCIN (Pin 41): Supply. External DC power source. A
0.1µF bypass capacitor must be connected to this pin as
close as possible. No series resistance is allowed, since
the adapter current limit comparator input is also this pin.
Internal Power Supply Pins
V
Also used in conjunction with MODE pin to modify the
LTC1760 operating mode.
GND (Pin 24): Ground for Low Power Circuitry.
V
Power Internal Logic Circuitry. Must be connected to V
PGND (Pin 38): High Current Ground Return for BGATE
Driver.
V
output with at least a 2µF to 4.7µF capacitor. Do not use
this regulator output to supply external circuitry except
as shown in the application circuit.
SBS Interface Pins
SCL2 (Pin 17): SMBus Clock Signal to Smart Battery 2. Do
not connect to an external pull-up. The LTC1760 connects
this pin to an internal pull-up (I
SCL (Pin 18): SMBus Clock Signal to SMBus Host. Also
used to determine flashing rate for stand-alone charge
indicators. Requires an external pullup to V
SMBus operating mode). Connected to internal SMBus
accelerator.
SCL1 (Pin 19): SMBus Clock Signal to Smart Battery 1. Do
not connect to an external pull-up. The LTC1760 connects
this pin to an internal pull-up (I
DDS
CC2
CC
U
(Pin 40): Internal Regulator Output. Bypass this
(Pin 25): The V
(Pin 20): Power Supply for SMBus Accelerators.
U
U
CC2
Power Supply is used Primarily to
PULLUP
PULLUP
) when required.
) when required.
DDS
(normal
CC
CC
,
.
SDA2 (Pin 21): SMBus Data Signal to Smart Battery 2. Do
not connect to an external pull-up. The LTC1760 connects
this pin to an internal pull-up (I
SDA (Pin 22): SMBus Data Signal to SMBus Host. Also
used to indicate charging status of Battery 2. Requires an
external pullup to V
accelerator.
SDA1 (Pin 23): SMBus Data Signal to Smart Battery 1. Do
not connect to an external pull-up. The LTC1760 connects
this pin to an internal pull-up (I
MODE (Pin 26): Used in conjunction with V
SCL, SDA and SMBALERT to indicate charging status.
May also be used as a hardware charge inhibit.
TH2B (Pin 27): Thermistor Force/Sense Connection to
Smart Battery 2 SafetySignal. Connect to Battery 2 ther-
mistor through resistor network shown in “Typical
Application.”
TH2A (Pin 28): Thermistor Force/Sense Connection to
Smart Battery 2 SafetySignal. Connect to Battery 2 ther-
mistor through resistor network shown in “Typical
Application.”
SMBALERT (Pin 29): Active Low Interrupt Pin. Signals
SMBus Host that there has been a change of status in
battery or AC presence. Open drain with weak current
source pull-up to V
pulled to 5V externally). Also used to indicate charging
status of Battery 1.
TH1A (Pin 30): Thermistor Force/Sense Connection to
Smart Battery 1 SafetySignal. Connect to Battery 1 ther-
mistor through resistor network shown in “Typical
Application.”
TH1B (Pin 31): Thermistor Force/Sense Connection to
Smart Battery 1 SafetySignal. Connect to Battery 1 ther-
mistor through resistor network shown in “Typical
Application.”
CC2
DDS
. Connected to internal SMBus
(with Schottky to allow it to be
PULLUP
PULLUP
) when required.
) when required.
DDS
to allow
1760f