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BQ29209-Q1 Datasheet(PDF) 9 Page - Texas Instruments

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Part # BQ29209-Q1
Description  Voltage Protection with Automatic Cell Balance
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

BQ29209-Q1 Datasheet(HTML) 9 Page - Texas Instruments

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VC2
7.6 V
6 V
100%
79%
8.4 V
111%
(VC2
VC1)
CB2
+
)+
VD
CB
CB2
I
(R
R
R
-
=
VC1
CB1
R
CB
CB1
I
R
=
+
9
bq29209-Q1
www.ti.com
SLUSC62A – JUNE 2015 – REVISED MARCH 2016
Product Folder Links: bq29209-Q1
Submit Documentation Feedback
Copyright © 2015–2016, Texas Instruments Incorporated
Feature Description (continued)
8.3.5 Cell Balance Configuration
The cell balancing current may be calculated as follows:
For Cell 1 (VC1–GND) balancing current, ICB1:
(1)
For Cell 2 (VC2–VC1) balancing current, ICB2:
(2)
Where:
RCB = resistor connected between the top of Cell 1 and the VC1_CB
RCB1 = resistor connected between the top of Cell 1 and the VC1
RCB2 = resistor connected between the top of Cell 2 and the VC2
RVD = resistor connected between the top of Cell 2 and the VDD
8.3.6 Cell Imbalance Auto-Detection (Via Cell Voltage)
The VMM_DET_ON and VMM_DET_OFF specifications are calibrated where VDD = VC2 = 7.6 V and VC1 = 3.8 V. The
recommended range of cell balancing is VC2 and VDD between 6.0 V and 8.4 V, and VC1 between 3 V and 4.2
V. Below VDD = 6 V, it is recommended to pull CB_EN high to disable the cell balancing function.
Figure 5. VMM_DET_ON and VMM_DET_OFF Threshold
8.3.7 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 (VPROTECT, VOA). If accurate
overvoltage thresholds are to be tested, use the standard delay settings that are intended for normal use.
To enter CTM, VDD 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, XDELAY, to a significantly reduced factor of
approximately 0.08, thereby reducing the delay time during an overvoltage condition.


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