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L9680 データシート(PDF) 42 Page - STMicroelectronics |
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L9680 データシート(HTML) 42 Page - STMicroelectronics |
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42 / 286 page  Start-up and power control L9680 42/286 DS11615 Rev 7 Figure 15. ER discharge state diagram 6.5 ER CAP diagnostic The L9680 IC contains a full integrated solution to check the connection, value and series resistance of energy reserve capacitor independent from ER Cap leakage current and Boost Voltage level. 6.5.1 ER CAP measurement The IC contains two current generators used to charge and discharge the energy reserve capacitor connected on ER pin. The simplified block diagram is shown in the figure below. Figure 16. ER CAP measurement block diagram To obtain an accurate ER CAP measurement, the VER voltage conversion must be required when both current generators are off, namely no current flows through ER cap permits to avoid ESR error contribution. GAPGPS02258 power mode control ER Discharge [Active_mode = 1 OR (POWER_MODE_SHUTDOWN=1 AND VER_VBATMON_COMP=1)] AND SYS_CTL(ER_CUR_EN[1:0]) = 10 AND “ER CAP ESR DIAG not in progress” /SLEEP_MODE = 0 OR ER_STATE = 1 OR SPI ER_CUR_EN[1:0] 10 OR (POWER_MODE_SHUTDOWN=1 AND VER_VBATMON_COMP=0) SSM_Reset ER DISCHARGE ON Start T1 350ms ER DISCHARGE OFF Reset T1 POWER_MODE_SHUTDOWN=0 AND T1 timeout ER DISCHARGE STBY Default SYS_CTL(ER_CUR_EN[1:0]) = 00 at SSM_RESET = 1 /SLEEP_MODE = 0 OR ER_STATE = 1 OR SPI ER_CUR_EN[1:0] 10 POWER_MODE_SHUTDOWN ER_Discharge OFF =1 VER_VBATMON_COMP = 1 when VER < VBATMON + Vver_vbatmon_th ERBOOST ER_CHARGE ER_DISCHARGE GNDA ER Cap ESR I GND_ADC VER EN CAPmes ADC 10-bit C leak GAPGPS02261 |
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