DS2778 Maxim Integrated Products, DS2778 Datasheet - Page 13

• Manufacturer Part Number: DS2778
• Description: 2-Cell Stand-Alone Li+ Fuel-Gauge IC
• Manufacturer: Maxim Integrated Products

Table 1. Li+ Protection Conditions and DS2775/DS2776 Responses
Figure 3. Li+ Protection Circuitry Example Waveforms
Note 1: V
Note 2: Sleep mode is only entered if UVEN = 1.
Note 3: If V
Note 4: With test current I
Note 5: With test current I
Overvoltage (OV) (Note 1)
Undervoltage (UV) (Note 1)
Overcurrent, Charge (COC)
Overcurrent, Discharge
(DOC)
Short Circuit (SC)
DISCHARGE
*IF UVEN = 1.
Protector and Optional SHA-1 Authentication
CONDITION
vides an internal current limit (I
CHARGE
CELL
POWER
MODE
CELL
V
SNS
2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
V
CC
DC
IN
is defined as (V
< V
______________________________________________________________________________________
UV
when a charger connection is detected, release is delayed until V
t
OVD
PPD
TST
flowing from V
flowing from PLS to V
IN1
THRESHOLD
V
V
- V
V
V
V
SNS
SNS
CELL
CELL
t
SNS
SCO
SS
RC
) or (V
< V
> V
> V
> V
< V
) to safely charge the battery.
COC
DOC
SC
DD
OV
UV
IN2
to PLS (pullup on PLS).
- V
t
SS
IN1
OVD
(pulldown on PLS) enabled.
).
ACTIVATION
DELAY
t
t
t
t
t
OCD
OCD
OVD
UVD
SCD
t
OCD
Sleep Mode (Note 2)
t
OCD
CC Off, DC Off,
CC Off, DC Off
RESPONSE
CC Off
DC Off
DC Off
CELL
≥ V
UV
V
. The recovery charge path pro-
PLS
(charger removed) (Note 4)
t
t
V
UVD
UVD
or (both V
RELEASE THRESHOLD
(V
(load removed) (Note 5)
PLS
V
> V
Both V
SNS
CELL
UVEN = 0) (Note 3)
V
V
> V
IN2
PLS
PLS
< V
DD
(charger connected)
CELL
1.2mV and both
< V
> V
CELL
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OV
– V
DD
DD
< V
) (Note 1)
TP
> V
– V
– V
V
V
V
V
V
0
-V
V
V
V
V
V
ACTIVE
SLEEP*
CE
(Note 5)
UV
OV
CE
UV
SC
DOC
OHCC
CP
DD
CP
PLS
COC
TP
TP
or
and
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