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BQ2058MSN Datasheet(PDF) 7 Page - Texas Instruments

Part # BQ2058MSN
Description  Lithium Ion Pack Supervisor for 3- and 4-Cell Packs
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

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Event Definition:
0:
The bq2058 is in the low-power sleep mode because one or more of the cell voltages are below VUV.
1:
A charger is applied to the pack, causing the difference between CSH and BAT1P to become greater
than 70mV. This awakens the bq2058, and the discharge pin DSG goes low.
2:
One or more cells charge to a voltage equal to VOV, initiating the overvoltage delay timer.
3:
The overvoltage delay time expires, causing CHG to be driven high.
4:
All cell voltages fall below VCE, causing CHG to be driven low.
5:
Stop charging, apply a load.
6:
An overcurrent condition is detected, initiating the overcurrent delay timer.
7:
The overcurrent delay time expires, causing DSG to be driven high.
8:
The overcurrent condition is no longer present; DSG is driven low.
9:
Pin CTL is driven high; both DSG and CHG are driven high.
10:
Pin CTL is driven low; both DSG and CHG resume their normal function.
11:
One or more cells fall below VUV, initiating the overdischarge delay timer.
12:
Once the overdischarge delay timer expires, if any of the cells is below VUV, the bq2058 drives
DSG high and enters the low-power sleep mode.
bq2058
TD205801.eps
Cell Voltage
VOV
CSH
DSG
CHG
CTL
VCE
VUV
0
1
2
3
4 5
6
7
8
9 10
11 12
BAT1P + 70mV (VCD)
BAT1P - 160mV (VOCH)
tUVD
tOCD
tOVD
Figure 3. Protector Event Diagram


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