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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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L9965P-FP 데이터시트(PDF) 52 Page - STMicroelectronics |
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L9965P-FP 데이터시트(HTML) 52 Page - STMicroelectronics |
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52 / 104 page  Figure 26. ER cap discharge pins voltage profiles t1 ∆t1 ∆VER t1B t1A t2 t2B t2A Vstart Vstart_t1+ Vstop Vstop_t2- ∆tDCH ∆t2 VERBST ∆VESR_t1 ∆VESR_t2 VERDCHSW Vstart Vstop t0 RDCH*IDCH To perform capacitance and ESR measurements, the device has two dedicated ADCs: one for voltages' measurement, one for current measurement. Before to run the diagnostic, the user should write: • Capacitance threshold via ERCAP_C_THR[7:0] bit field in NVM, precalculated by the user using the following formula: CμF="00"&ERCAP_C_THR7:0&"0000"×LSBC RERDCHSW (4) • ESR threshold via and ERCAP_ESR_THR[6:0] bit field in NVM, precalculated by the user using the following formula: ESRmΩ = ERCAP_ESR_THR7:0&"0000" ×LSBESR×RERDCHSW 1000 (5) To reduce the noise during the measurement step, the ERBST is automatically disabled during the ER capacitor diagnostic (see the Figure 27). L9965P Functional description DS14702 - Rev 4 page 52/104 |
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