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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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L9679P 데이터시트(PDF) 42 Page - STMicroelectronics |
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L9679P 데이터시트(HTML) 42 Page - STMicroelectronics |
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42 / 279 page  Start-up and power control L9679P 42/279 DS11627 Rev 7 The user can decide the charge and discharge time based on the ER CAP used in application, in order to maximize the differential voltage and then improve the accuracy. Anyway, a timeout on ER Discharge current has been implemented to prevent thermal issue, so the discharge time cannot be longer than 350 ms. Figure 16. ER CAP measurement timing diagram The following formulas can be used to retrieve the ER CAP value from the voltage and timing measurements. T1 = discharge time T2 = charge time, same as discharge time T1 = T2 = T V1 = Vstart - Vstop V2 = Vend - Vstop I1 = discharge current I2 = charge current, same as discharge current I1 = I2 = I ILEAK = leakage current ESR > 0 VER (t) ER_DISCHARGE ER_CHARGE ESR = 0 Vstart Vstop Vend T1 T2 GAPGPS02262 V1 V2 + I1 ILEAK + C ---------------------------T1 I2 ILEAK – C --------------------------T2 + = C 2 I T Vstart Vend 2 Vstop – + ---------------------------------------------------------------- = |
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