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| BQ2954 Datasheet, PDF (11/18 Pages) Texas Instruments – Lithium Ion Charge Management IC with Integrated Switching Controller | |||
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bq2954
VCC
bq2954
RT1
LPD1
13
VCC
12
VSS
SNS 7
TS 8
NTC
Thermistor
RT2 RT
t
BAT -
RSNS
VSS
Low-Side Sense Mode
FGbq295404LS.eps
Figure 8. Low-Side Temperature Sensing
VCC
bq2954
RT1
LPD1
13
VCC
12
VSS
SNS 7
TS 8
NTC
Thermistor
RT2 RCSEL
BAT -
VSS
High-Side Sense Mode
FGbq295404HS.eps
Figure 9. High-Side Temperature Sensing
R
1
TM
C
VCC
VCC 13
VSS 12
bq2954
VSS
FGbq295405.eps
Figure 10. R-C Network/Setting MTO
Disabling Temperature Sensing
Temperature sensing can be disabled by placing a 10kâ¦
resistor between TS and BAT- and a 10k⦠resistor be-
tween TS and VCC. See Figures 8 and 9.
Maximum Time-Out
Maximum Time-Out period (tMTO) is programmed from
1 to 24 hours by an R-C network on the TM pin (see Fig-
ure 10) per the following equation:
tMTO = 500 â R â C
(5)
where R is in ohms, C is in Farads, and tMTO is in hours.
The recommended value for C is 0.1µF.
The MTO timer is reset at the beginning of fast charge.
If the MTO timer expires during the voltage regulation
phase, fast charging terminates and the bq2954 enters
the Charge Complete state. If the conditioning phase
continues for time equal to tQT (MTO/4) and the battery
potential does not reach VMIN, the bq2954 enters the
fault state and terminates charge. See Table 3. If the
MTO timer expires during the current-regulation phase
(VBAT never reaches VREG), fast charging is terminated,
and the bq2954 enters the fault state.
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