Datasheet

T1
T2
T3
T4 T5
(50 C)°(45 C)°(10 C)°(0 C)° (60 C)°
4.15 V
4.25 V
1.0 C°
4.1 V
0.5 C°
Implementation on bq
Portion of spec not covered by TS
24278
DISABLE
V
DRV
TEMP
PACK +
PACK -
+
+
V
DRV
TS COLD
TS HOT
TS
bq24278
RHI
RLO
bq24278
www.ti.com SLUSB04 –JUNE 2012
Figure 4. TS Circuit
Figure 5. Charge Current During TS Conditions
To satisfy the JEITA requirements, four temperature thresholds are monitored; the cold battery threshold; the
cold battery threshold (T
NTC
< 0°C), the cool battery threshold (0°C < T
NTC
< 10°C), the warm battery threshold
(45°C < T
NTC
< 60°C) and the hot battery threshold (T
NTC
> 60°C). These temperatures correspond to the V
COLD
,
V
COOL
, V
WARM
, and V
HOT
thresholds. Charging is suspended and timers are suspended when V
TS
< V
HOT
or V
TS
>
V
COLD
. When V
HOT
< V
TS
< V
WARM
, the battery regulation voltage is reduced by 140 mV from the programmed
regulation threshold. When V
COOL
< V
TS
< V
COLD
, the charging current is reduced to half of the programmed
charge current.
The TS function is voltage based for maximum flexibility. Connect a resistor divider from DRV to GND with TS
connected to the center tap to set the threshold. The connections are shown in Figure 10. The resistor values are
calculated using the following equations:
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