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BQ27743 Datasheet(PDF) 19 Page - Texas Instruments

No. de pieza BQ27743
Descripción Electrónicos  Single-Cell Li-Ion Battery Fuel Gauge with Programmable Hardware Protection
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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bq27743
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SLUSCM0A – JUNE 2017 – REVISED SEPTEMBER 2018
Product Folder Links: bq27743
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
Table 5. Hardware Overcurrent in Discharge Configuration
Prot OC Config
OVERCURRENT IN DISCHARGE (VOCD) SETTING
[OCD1]
[OCD0]
[OCD0]
0
0
0
14 mV
0
0
1
24 mV
0
1
0
34 mV (default)
0
1
1
44 mV
1
0
0
53 mV
1
0
1
63 mV
1
1
0
73 mV
1
1
1
83 mV
Table 6. Hardware Short-Circuit in Discharge Configuration
Prot OC Config
SHORT-CIRCUIT IN DISCHARGE (VSCD) SETTING
[SCD]
0
73 mV (default)
1
148 mV
8.3.4.4 PROTECTION SYNCHRONIZATION
The bq27743 includes an optional protection synchronization feature for dual battery systems using the PSC and
PSD pins, where the PSC pin is used to synchronize the charge FETs and the PSD pin is used for the discharge
FETs between the two devices in the system.
The PSD and PSC pins are dual purpose pins used in conjunction with the HDQ and INT pins and are
configured by Pack Configuration [PS_EN] where:
[PS_EN]
0
HDQ/PSD is used as the HDQ pin and Protection Synchronization is disabled.
INT/PSC is used as the INT pin and Protection Synchronization is disabled.
1
HDQ/PSD is used as the PSD pin and Protection Synchronization is enabled.
INT/PSC is used as the PSC pin and Protection Synchronization is enabled.
It is recommended to set Pack Configuration [SLEEP] = 0 to disable SLEEP mode when [PSEN] = 1. This will
enable the reaction timing to be consistent.
When the device FET state changes, either because of hardware or firmware protection, then the PSC and PSD
pins change based on the following table:
CHG FET
DSG FET
PSC
PSD
ON
ON
Input
Input
OFF
ON
Output Low
Input
ON
OFF
Input
Output Low
OFF
OFF
Output Low
Output Low
8.4 Device Functional Modes
8.4.1 Operating Modes
The battery protector has several operating modes depending on a variety of conditions. The various modes are
described below:
NORMAL Mode
OVERVOLTAGE Mode
UNDERVOLTAGE Mode
OVERCURRENT IN DISCHARGE and SHORT-CIRCUIT IN DISCHARGE Mode


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