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AS3525 Datasheet(PDF) 119 Page - ams AG |
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AS3525 Datasheet(HTML) 119 Page - ams AG |
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119 / 194 page  AS3525-A/-B C22O22 Data Sheet, Confidential © 2005-2009, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved. www.austriamicrosystems.com Revision 1.13 119 - 194 7.4 Audio and Power Management functions 7.4.1 SYSTEM 7.4.1.1 General The system block handles the power up, power down and regulator voltage settings of the AFE. 7.4.1.2 Power Up The chip powers up when on of the following condition is true: • High signal on the PWR_UP pin (>80ms, >1V & >1/3 BVDD) • Input voltage on the UVDD pin (USB plug in: >80ms, BVDD>1.5V, UVDD>4.5V) • Input voltage on the CHG_IN pin (charger plug in: >80ms, BVDD>1.5V, CHG_IN>4.0V) • Input voltage on BVDD pin (battery change: >1.35V) To hold the chip in power up mode the PwrUpHld bit in the SYSTEM register (0x20h) is set. 7.4.1.3 Power Down The chip automatically shuts off if one of the following conditions arises: 1. Clearing the PwrUpHld bit in SYSTEM register (0x20h) 2. I2C watchdog power down if enabled (no serial reading for >1s, has to be enabled) 3. BVDD drops below the minimum threshold voltage (<2.7V) 4. Junction temperature reaches maximum threshold, set in SUPERVISOR register (0x24h) 5. High signal on the PWR_UP pin for more than (>6s, >1V & >1/3 BVDD). Figure 44 Power Up Timing Power up from PwrUp, CHG_IN, VBUS or RTCSUP pin BVDD rising with VBAT1 supply (DCDC3V) VREF, IREF rising with vdd_bandgap QLDO1 & 2 AVDD & DVDD for internal supply Enable CP Sequence EN LDO2 + DCDC start sequencer with 1.2 MHz clock VREF=ok QLDO2=ok Enable PVDD Enable CVDD +2ms +4ms start up with length regulator (200mA) charge pump (50mA) enable unlock, enable via I2C setting +6ms PowerGood = XRES +8ms Enable IOVDD +10ms |
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