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DA9021 Datasheet(PDF) 81 Page - Dialog Semiconductor |
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DA9021 Datasheet(HTML) 81 Page - Dialog Semiconductor |
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81 / 142 page  DA9021/22 System PMIC with high efficiency USB power manager Datasheet Revision 2.5 17-Feb-2017 CFR0011-120-00 Rev 5 81 of 142 © 2017 Dialog Semiconductor 16 Power supply sequencer The start-up of DA9021/22 supplies is performed with a sequencer. The sequencer is able to control up to 14 IDs (3 buck converter, 5 LDOs, 4 feedback pin level controls, a Wait ID and a POWERDOWN register), which can be grouped in three power domains. The power sequences for each domain have configurable size. nPOR_UPPER POWER-UP PWR1_EN SYS_EN PWR_EN EXT_WAKEUP nONKEY VDDCORE VDDOUT 3.6V (from Charger Buck) VDD_REF Registers Loaded From OTP nVDD_FAULT SEQ1 SEQ2 SEQ3 Wait for PWR_EN PWR_UP Wait for PWR1_EN Debouncing (10ms default) nRESET Start Reset Time OTP read finished SEQ1+SEQ2+SEQ3=15step 1ms to 1s Wait for SYS_EN = 32us Figure 37: Typical power-up timing |
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