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AN2390 Datasheet(PDF) 11 Page - STMicroelectronics

Part # AN2390
Description  A flexible universal battery charger
PDF  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2390 Datasheet(HTML) 11 Page - STMicroelectronics

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AN2390
Evaluation board implementation
11/42
2.2
Analog measurement circuitry
2.2.1
Voltage reference generation
In the evaluation board, TL1431 is used to provide the reference voltage for the ADC
measurement as shown in Figure 5.
Figure 5.
Voltage reference generation circuit
This device provides a reference voltage to the ADC and provides a reference of precision
better than the 0.5% needed for the battery charger application.
By choosing the appropriate value of R16 and R17 with the proper accuracy, we can provide
the required reference voltage to the VAREF pin of the ST7 MCU using the following
formula:
VAREF_VALUE = 2.5 V * (1 + R16 / R17)
R16
4.7k (0.1%)
100 (1%)
R3
TL1431AIZ
R17
15k (0.1%)
D4
VAREF
VIN



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