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BQ27743 Datasheet(数据表) 32 Page - Texas Instruments

部件型号  BQ27743
说明  Single-Cell Li-Ion Battery Fuel Gauge with Programmable Hardware Protection
下载  42 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
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BQ27743 Datasheet(HTML) 32 Page - Texas Instruments

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bq27743
SLUSCM0A – JUNE 2017 – REVISED SEPTEMBER 2018
www.ti.com
Product Folder Links: bq27743
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
Typical Applications (continued)
Table 11. Key Data Flash Parameters for Configuration (continued)
NAME
DEFAULT
UNIT
RECOMMENDED SETTING
T4 Temp
50
°C
Sets the boundary between charging with T4-T5 or T4-T5 parameters. Also
serves as charge inhibit boundary if initiating new charging event. Defaults set
based on recommended values from JEITA standard.
T5 Temp
60
°C
Sets the boundary between charging suspend and charging with T4-T5
parameters. Refer to JEITA standard for compliance.
Temp Hys
1
°C
Adds temperature hysteresis for boundary crossings to avoid oscillation if
temperature is changing by a degree or so on a given boundary.
T1-T2 Chg Voltage
4350
mV
Sets reported charge voltage when inside of T1 Temp and T2 Temp range.
Defaults set based on recommended values from JEITA standard.
T2-T3 Chg Voltage
4350
mV
Sets reported charge voltage when inside of T2 Temp an d T3 Temp range.
Defaults set based on recommended values from JEITA standard.
T3-T4 Chg Voltage
4300
mV
Sets reported charge voltage when inside of T3 Temp and T4 Temp range.
Defaults set based on recommended values from JEITA standard.
T4-T5 Chg Voltage
4250
mV
Sets reported charge voltage when inside of T4 Temp and T5 Temp range.
Defaults set based on recommended values from JEITA standard.
T1-T2 Chg Current
50
%
Sets reported charge current when inside of T1 Temp and T2 Temp range.
Defaults set based on recommended values from JEITA standard.
T2-T3 Chg Current
80
%
Sets reported charge current when inside of T2 Temp and T3 Temp range.
Defaults set based on recommended values from JEITA standard.
T3-T4 Chg Current
80
%
Sets reported charge current when inside of T3 Temp and T4 Temp range.
Defaults set based on recommended values from JEITA standard.
T4-T5 Chg Current
80
%
Sets reported charge current when inside of T4 Temp and T5 Temp range.
Defaults set based on recommended values from JEITA standard.
OV Prot Threshold
4390
mV
Set to maximum allowable cell voltage due to overcharge in normal operation.
OV Prot Delay
1
s
Set to required OVP duration prior to fault detection and FET disable. Setting of 0
disables firmware-based OVP feature. Default of 1s is recommended.
OV Prot Recovery
4290
mV
Set to desired OVP recovery threshold. 100 to 200 mV below OVP trip threshold
is common.
OV Prot Threshold
2800
mV
Set to minimum allowable cell voltage due to overdischarge in normal operation.
OV Prot Delay
1
s
Set to required UVP duration prior to fault detection and FET disable. Setting of 0
disables firmware-based UVP feature. Default of 1s is recommended.
OV Prot Recovery
2900
mV
Set to desired UVP recovery threshold. 100 to 200 mV above UVP trip threshold
is common.
Body Diode Current
Threshold
60
mA
Varies based on FET selection. Use the max DC current for the forward-biased
body diode from the FET datasheet and derate based on the operating
temperature range to arrive at the minimum current value (and add some margin)
that the fuel gauge should use to re-enable FET when disabled during a fault
condition.
OT Chg
55.0
°C
Set to desired temperature at which charging is prohibited to prevent cell damage
due to excessive ambient temperature.
OT Chg Time
5
s
Set to desired time before CHG FET is disabled based on overtemperature.
Since temperature changes much more slowly than other fault conditions, the
default setting is sufficient for most application.
OT Chg Recovery
50.0
°C
Set to the temperature threshold at which charging is no longer prohibited.
OT Dsg
60.0
°C
Set to desired temperature at which discharging is prohibited to prevent cell
damage due to excessive ambient temperature.
OT Dsg Time
5
s
Set to desired time before DSG FET is disabled based on overtemperature. Since
temperature changes much more slowly than other fault conditions, the default
setting is sufficient for most application.
OT Dsg Recovery
55.0
°C
Set to the temperature threshold at which cell discharging is no longer prohibited.
Prot OC Config
0A
hex
Set based on required trip thresholds for overcurrent in charge, overcurrent in
discharge, and short-circuit in discharge. When setting this parameter, be sure to
account for charger tolerance and maximum load spikes expected in the end
system to avoid accidental trip of these fault conditions




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