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BQ77904 Datasheet(PDF) 15 Page - Texas Instruments

No. de pieza BQ77904
Descripción Electrónicos  BQ77904, BQ77905 3-Series to 20-Series Ultra Low-Power Voltage, Current, Temperature, and Open-Wire Stackable Lithium-Ion Battery Protector
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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BQ77904 Datasheet(HTML) 15 Page - Texas Instruments

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protection-fault checks. Comparator 1 checks for OV, UV, and OW protection faults. Comparator 2 checks for
OCD1, OCD2, SCD, OTC, OTD, UTC, and UTD protection faults. For OV, UV, and OW protection faults, every
cell is checked individually in round-robin fashion, starting with cell 1 and ending with the highest-selected cell.
The number of the highest cell is configured using the CCFG pin.
Devices can be ordered with various timing and hysteresis settings. See the Section 5 section for a summary of
options available per device type.
Check OV VCELL1
Check OV VCELL2
Time to check
UV?
Check OV VCELLn
Check UV VCELL1
Check UV VCELL2
Check UV VCELLn
Time to check
OW?
Turn off Comp1 until
next cycle start
Check OW VCELLx,
x = x +1
YES
Reset x = 1, if x >
the highest cell
configured via
CCFG pin
YES
NO
NO
n = the highest call
configured by CCFG pin
x starts
from 1
at POR
Figure 8-1. Comparator 1 Flowchart
Check SCD
Time to check
OCD1?
Time to check
OCD2?
Check
OCD1
Check
OCD2
YES
YES
NO
NO
Time to check
OT?
Time to check
UT?
Check OT
Check UT
YES
YES
NO
NO
Figure 8-2. Comparator 2 Flowchart
8.3.2 Fault Operation
8.3.2.1 Operation in OV
An OV fault detection is when at least one of the cell voltages is measured above the OV threshold, VOV. The
CHG pin is turned off if the fault condition lasts for a duration of OV Delay, tOVn_DELAY. The OV fault recovers
when the voltage of the cell in fault is below the (OV threshold – OV hysteresis, VHYS_OV) for a time of OV Delay.
The BQ77904 and BQ77905 assume OV fault after device reset.
www.ti.com
BQ77904, BQ77905
SLUSCM3K – APRIL 2020 – REVISED JULY 2020
Copyright © 2020 Texas Instruments Incorporated
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Product Folder Links: BQ77904 BQ77905


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