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LC709203FXE-03MH Arkusz danych(PDF) 11 Page - ON Semiconductor

Numer części LC709203FXE-03MH
Szczegółowy opis  Smart LiB Gauge Battery Fuel Gauge LSI
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Producent  ONSEMI [ON Semiconductor]
Strona internetowa  http://www.onsemi.com
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11
Before RSOC (0x04)
This LSI obtains Open Circuit Voltage (OCV) reading 10 ms
after Power-on reset to initialize RSOC (See figure 7).
Or the LSI can be forced to initialize RSOC by sending the
Before RSOC Command (0
04 = AA55) or the Initial RSOC
Command (0
07 = AA55). The accuracy of the Initialization
requires the OCV reading to be taken with minimal load or
charge, under 0.025C, on the battery. (i.e. less than 75mA for
3000mAh design capacity battery.).
The LSI initializes RSOC by the maximum voltage between
initialize after Power-on reset and setting the command when the
Before RSOC command is written. (See figure 8).
Thermistor B (0x06)
Sets B-constant of the thermistor to be measured. Refer to the
specification sheet of the thermistor for the set value to use.
Initial RSOC (0x07)
The LSI can be forced to initialize RSOC by sending the Before
RSOC Command (0
04 = AA55) or the Initial RSOC Command
(0
07 = AA55).
Figure 7. RSOC automatic initialization
Figure 8. Before RSOC command
The LSI initializes RSOC by the measured voltage at that
time when the Initial RSOC command is written. (See
figure 9). The maximum time to initialize RSOC after the
command is written is 1.5 ms.
Cell Temperature (0x08)
This register contains the cell temperature from
20C (009E4)
to +60
C (00D04) measured in 0.1C units.
In the Thermistor mode (0
16 = 01) the LSI measures the
attached thermistor and loads the temperature into the Cell
Temperature register. In the Thermistor mode, the thermistor
shall be connected to the LSI as shown in figure 2. The
temperature is measured by having TSW pin to provide power
into the thermistor and TSENSE pin to sense the output voltage
from the thermistor. Temperature measurement timing is
controlled by the LSI, and the power to the thermistor is not
supplied for other reasons except to measure the temperature.
In the I2C mode (0
16 = 00) the temperature is provided by the
host processor. During discharge/charge the register should be
updates when the temperature changes more than 1
C
Cell Voltage (0x09)
This register contains the voltage on VDD 1mV units.
Current Direction (0x0A)
This register is used to control the reporting of RSOC. In Auto
mode the RSOC is reported as it increases or decreases. In
Charge mode the RSOC is not permitted to decrease. In
Discharge mode the RSOC is not permitted to increase.
With consideration of capacity influence by temperature, we
recommend operating in Auto because RSOC is affected by the
cell temperature. A warm cell has more capacity than a cold cell.
Be sure not to charge in the Discharge mode and discharge in the
Charge mode; it will create an error.
An example of RSOC reporting is shown in Figures 10 and 11.
Figure 9. Initial RSOC command


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