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RT5035B Datasheet(PDF) 22 Page - Richtek Technology Corporation |
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RT5035B Datasheet(HTML) 22 Page - Richtek Technology Corporation |
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22 / 44 page  RT5035A/B Copyright © 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS5035A/B-02 February 2017 22 CH9 : Keep Alive LDO and RTC Related Function Block The RT5035A/B provides a 3.1V output LDO for all IC control circuits and real time clock. The LDO features low quiescent current (3 A) and high output voltage accuracy. This LDO is always on, even when the system is shut down. For better stability, it is recommended to connect a 1 F to the VDDM pin. The RTCPWR switch avoids back charging from the RTCPWR node into the input node VDDM. RTCPWR + - + - VREF VM VM 3.1V VDDM = 3.1V ±3% BAT UVLO VM Low BAT discharge UVLO 2.4V/2.2V VDDM /RESET 2.6V/2.4V + - BAT VM falling delay 4ms CL = 40mA (min) To ASIC Power Sequencer To ASIC Power Sequencer RTCPWR RTCPWR + 1 μF Backup Battery RTCPWR RTCPWR RTCPWR Rbias C2 C1 R1 Freq divider 1Hz clock C32K N = 0 to 63 Count YY/MM/DD, Week, hh : mm : ss With leap year correction Internal bus To ASIC Power Sequencer 32768Hz XOUT XIN RTCGND RTC UVLO 1.9V + - RTCPWR /R /R /EN VDDM CH10 : Synchronous Step-Down DC-DC Converter CH10 is suitable for memory power in DSC system. The converter operates in fixed frequency PWM mode or PFM mode with integrated internal MOSFETs, FB resistors and compensation network. The CH10 step-down converter can be operated at 100% maximum duty cycle to extend battery operating voltage range. The output voltage of CH10 is adjustable by the I2C interface in the range of 1.2V to 1.52V or set by external feedback resistors, as expressed in the following equation : VOUT_CH10 = (1 + R1 / R2) x VFB10 Where VFB10 is 0.8V typically and suggested value for R1 is 100k to 600k. RTC_C32K The Frequency Divider from 32768Hz to 1Hz would generate the below 1Hz wave that with a little jitter but the 1Hz average frequency can be finely tuned. RTCPWR RTCPWR Rbias C2 C1 R1 Freq divider 1Hz clock 32767 CLKo C32K 32767 CLKo 32767 CLKo N CLKo ... 1 2 60 1 60sec N = 0 to 127 Fine tune 1Hz by digital divider can create tuning range = (-60 to 67) / (32768Hz x 60s) = -30 to 33 ppm each tune step size = 0.5 ppm. But the 1Hz would include jitter and the C32K still is not tuned. 1Hz clock |
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