BQ29200 Datasheet, PDF (8/15 Pages) Texas Instruments – Voltage Protection with Automatic Cell Balance for 2-Series Cell Li-Ion Batteries

bq29200
bq29209
SLUSA52 – JUNE 2010
R_VD
RIN
VCELL2
1 VC2
RIN ^CIN
OUT 8
2 VC1
VDD 7
CIN
3 VC1_CB CB_EN 6
CVD
RCB
VCELL1
4 CD
GND 5
CCD
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Figure 4. 2-Series Cell Configuration
CUSTOMER TEST MODE
Customer Test Mode (CTM) helps to greatly reduce the overvoltage detection delay time and enable quicker
customer production testing. This mode is intended for quick-pass board-level verification tests, and, as such,
individual cell overvoltage levels may deviate slightly from the specifications (V_PROTECT, V_OA). If accurate
overvoltage thresholds are to be tested, use the standard delay settings that are intended for normal use.
To enter CTM, V_DD should be set to approximately 9.5 V higher than VC2. When CTM is entered, the device
switches from the normal overvoltage delay time scale factor, x_DELAY, to a significantly reduced factor of
approximately 0.08, thereby reducing the delay time during an overvoltage condition.
CAUTION
Avoid exceeding any Absolute Maximum Voltages on any pins when placing the part
into Customer Test Mode. Also, avoid exceeding Absolute Maximum Voltages for the
individual cell voltages (VC1–GND) and (VC2–VC1). Stressing the pins beyond the
rated limits may cause permanent damage to the device.
To exit CTM, the device should be powered off before being powered back on.
VDD
VC2
(VC2-VC1)
or
(VC1-GND)
4V
15 V
Test Mode entered
> 10 ms
V_PROTECT
4.5 V
V_PROTECT V_HYST
OUT
<<t_d
8
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