BQ27742-G1 Datasheet, PDF (32/46 Pages) Texas Instruments – Single-Cell Li-Ion Battery Fuel Gauge with Programmable Hardware Protection

bq27742-G1
SLUSBV9C – MARCH 2014 – REVISED FEBRUARY 2016
www.ti.com
Typical Applications (continued)
Table 11. Key Data Flash Parameters for Configuration (continued)
NAME
T4 Temp
T5 Temp
Temp Hys
T1-T2 Chg Voltage
T2-T3 Chg Voltage
T3-T4 Chg Voltage
T4-T5 Chg Voltage
T1-T2 Chg Current
T2-T3 Chg Current
T3-T4 Chg Current
T4-T5 Chg Current
OV Prot Threshold
OV Prot Delay
OV Prot Recovery
OV Prot Threshold
OV Prot Delay
OV Prot Recovery
DEFAULT
50
60
1
4350
4350
4300
4250
50
80
80
80
4390
1
4290
2800
1
2900
Body Diode Current
Threshold
60
OT Chg
55.0
OT Chg Time
5
OT Chg Recovery
50.0
OT Dsg
60.0
OT Dsg Time
5
OT Dsg Recovery
55.0
Prot OC Config
0A
UNIT
°C
°C
°C
mV
mV
mV
mV
%
%
%
%
mV
s
mV
mV
s
mV
mA
°C
s
°C
°C
s
°C
hex
RECOMMENDED SETTING
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.
Sets the boundary between charging suspend and charging with T4-T5
parameters. Refer to JEITA standard for compliance.
Adds temperature hysteresis for boundary crossings to avoid oscillation if
temperature is changing by a degree or so on a given boundary.
Sets reported charge voltage when inside of T1 Temp and T2 Temp range.
Defaults set based on recommended values from JEITA standard.
Sets reported charge voltage when inside of T2 Temp an d T3 Temp range.
Defaults set based on recommended values from JEITA standard.
Sets reported charge voltage when inside of T3 Temp and T4 Temp range.
Defaults set based on recommended values from JEITA standard.
Sets reported charge voltage when inside of T4 Temp and T5 Temp range.
Defaults set based on recommended values from JEITA standard.
Sets reported charge current when inside of T1 Temp and T2 Temp range.
Defaults set based on recommended values from JEITA standard.
Sets reported charge current when inside of T2 Temp and T3 Temp range.
Defaults set based on recommended values from JEITA standard.
Sets reported charge current when inside of T3 Temp and T4 Temp range.
Defaults set based on recommended values from JEITA standard.
Sets reported charge current when inside of T4 Temp and T5 Temp range.
Defaults set based on recommended values from JEITA standard.
Set to maximum allowable cell voltage due to overcharge in normal operation.
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.
Set to desired OVP recovery threshold. 100 to 200 mV below OVP trip threshold
is common.
Set to minimum allowable cell voltage due to overdischarge in normal operation.
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.
Set to desired UVP recovery threshold. 100 to 200 mV above UVP trip threshold
is common.
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.
Set to desired temperature at which charging is prohibited to prevent cell damage
due to excessive ambient temperature.
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.
Set to the temperature threshold at which charging is no longer prohibited.
Set to desired temperature at which discharging is prohibited to prevent cell
damage due to excessive ambient temperature.
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.
Set to the temperature threshold at which cell discharging is no longer prohibited.
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
32
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