Datasheet

www.ti.com
SLEEP MODE
CHARGE ENABLE PIN
CHARGE STATUS OUTPUT
bq24200, bq24201
bq24202, bq24203
bq24204, bq24205
SLUS501C – OCTOBER 2001 – REVISED MARCH 2008
After a charge termination, the bq2420x restarts the charge once the voltage on the BAT pin falls below the
V
(RCH)
threshold. This feature keeps the battery at full capacity at all times.
The bq2420x enters the low-power sleep mode if the Vcc is removed from the circuit (i.e., the Vcc and IN pins
are floating). For applications where these pins are not floating, placing a low-power 10 Ω (1/16 W) between the
IN and VCC pins ensures the V
(SLP)
conditions are met (see Figure 9 ).This feature prevents draining the battery
during the absence of V
CC
.
Figure 9. Sleep Mode
The CE pin on bq24202, bq24203, bq24204 and bq24205 can be used to enable or suspend the charge. Charge
is enabled if the voltage V
IL(CE)
is applied to the pin. Applying the V
IH(CE)
suspends the charge. During a charge
suspend mode, the internal powerFET is turned off and all timers are reset.
The STAT pin on the bq2420x, indicates various conditions of operation. These conditions are summarized in
Table 1 .
Table 1. STAT Pin
CONDITION STAT
Pre-charge High
Fast-charge High
Charge-complete Low
Taper timer done Low
Charge suspend (due to temperature or CE input) Hi-Z
Thermal shutdown Hi-Z
Pre-charge timer fault Hi-Z
Sleep mode Hi-Z
Charge timer fault Hi-Z
12 Submit Documentation Feedback Copyright © 2001 – 2008, Texas Instruments Incorporated
Product Folder Link(s): bq24200, bq24201 bq24202, bq24203 bq24204, bq24205