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SC908 Datasheet(PDF) 22 Page - Semtech Corporation

Part # SC908
Description  Power Management IC for Single-Cell Li-Ion Devices
PDF  30 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC908 Datasheet(HTML) 22 Page - Semtech Corporation

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SC908
22
Applications Information (continued)
The fault modes signaled by FLTB are:
input over-voltage
battery NTC temperature out of range
pre-charge timeout.
charger-only over-temperature (low OT, post-
termination only)
•
•
•
•
When any of these conditions occurs the FLTB output goes
low; otherwise it remains high impedance.
The LBATB output is active when the battery voltage is
below the low-battery warning voltage, V
WARN
, if the charg-
ing adapter is absent. If CPB and CHRGB outputs are both
active, LBATB indicates when the charger is in precharge
mode. However, LBATB and FLTB active together always
Table 3 — Status Output State, Charging Adapter Present
Status Pins
Output State
(on = low)
Conditions
Description
and
Comments
Adapter
Voltage
(mutually
exclusive)
Battery
Voltage
(mutually
exclusive)
EN_NTC
(mutually
exclusive)
Charging State,
Charging Faults
(Internal signals)
on = open drain output driver is active
off = output is not active
T = listed condition is true
F = listed condition is false
- = don’t care
Blank = mutually exclusive with another condition
on
off
off
off
TT
T-
-
-
-
F
V
VAD
valid, Charger Disable/Reset OR
Charging Done (Die Temperature OK)
F-
-
F
F
F
F
on
off
off
on
T
T
T
--
-
-
F
V
VAD
valid and Low Battery Warning,
Charger Disable/Reset OR
Charge Cycle Pending (about to begin)
T
on
off
on
off
T-
-
F
T-
F-
-
F
V
VAD
valid,
Battery Temperature Fault OR
Charger Over-Temp Fault (Die Temp > T
CHRGR_OT
)
TT
on
off
on
on
T
T
T-
-
-
-
F
V
VAD
valid, Low Battery Detected, with either
Charger Disable/Reset OR
Battery Temperature Fault OR
Charger Over-Temp Fault OR
BAT short-to-ground
T-
-
-
-
TT
-
F
F
F-
-
-
T
-
-
on
on
off
off
T-
-
F
T
-
F
F
T
F
V
VAD
valid, Pre-termination Charging,
Battery Voltage > V
DET
on
on
off
on
T
-
-
F
T
F
F
T
T
F
V
VAD
valid, Pre-Charging (trickle charging),
Battery Voltage > V
DET
on
on
on
off
T-
-
F
T
T
F
T
T
F
V
VAD
valid, Pre-Charging with Charger Over-Temp
Fault, Battery Voltage > V
DET
on
on
on
on
T
T
T
-
F
-
T
F
V
VAD
valid, Battery Voltage < V
DET
Pre-Charging or Pre-Termination Charging



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