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| 型號(hào)： | BQ2007SN |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 118K |
| 代理商： | BQ2007SN |
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(LTF) at which fast charging or top-off is allowed. If the
voltage on pin TS rises above V
LTF,
the bq2000T
suspends fast charge or top-off but does not terminate
charge. When the voltage falls back below V
LTF,
fast
charge or top-off resumes from the point where
suspended.
Trickle-charge
condition.
is
allowed
during
this
Table 4 summarizes these various conditions.
Charge Status Display
The charge status is indicated by open-drain output
LED.
Table 5 summarizes the display output of the
bq2000T.
Sleep Mode
The bq2000T features a sleep mode for low power con-
sumption. This mode is enabled when the voltage at pin
BAT is above the low-power-mode threshold, V
SLP
. Dur-
ing sleep mode, the bq2000T shuts down all internal cir-
cuits, drives the LED output to high-impedance state,
and drives pin MOD to low. Restoring BAT below the
V
MCV
threshold initiates the IC and starts a fast-charge
cycle.
10
bq2000T
Table 5. Charge Status Display
Charge Action State
Battery absent
Pre-charge qualification
Trickle charge (before fast charge)
Fast charging
Top-off or trickle (after fast charge,
NiCd, NiMH only)
Charge complete
Sleep mode
Charge suspended (V
TS
> V
LTF
)
LED Status
High impedance
1Hz flash
1Hz flash
Low
High impedance
High impedance
High impedance
1Hz flash
Temperature
Condition
Action
V
TS
> V
LTF
Cold battery—checked at all times
Suspends fast charge or top-off and timer
Allows trickle charge—LED flashes at 1Hz rate
during pre-charge qualification and fast charge
Allows charging
Suspends fast-charge initiation, does not allow
trickle charge—LED flashes at 1Hz rate during
pre-charge qualification
V
HTF
< V
TS
< V
LTF
Optimal operating range
V
TS
< V
HTF
Hot battery—checked during charge quali-
fication and top-off and trickle-charge
V
TS
< V
TCO
Battery exceeding maximum allowable
temperature—checked at all times
Terminates fast charge or top-off
Table 4. Temperature-Monitoring Conditions
2000TCS.eps
BAT-
Power Supply ground
bq2000 ground
SNS
R
SNS
R
f
C
f
1
2
V
SS
bq2000T
Figure 9. Current-Sensing Circuit
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