i.MX8MMINI hardware design for RTC and set level voltage

[bl]

Hi 

     I have two questions about hardware design for i.mx8m mini , please halp me:

     1)   In 8MMINILPD4-EVK-DESIGNFLES.ZIP, We need to use CPU RTC function on our project , how to connect the PMIC(BD71847MWV) if we use the coin-battery(3V), or can't support that ........

      2)  about the power configuration for  CPU , if we set power NVCC_ECSPI is 3.3V, powe NVCC_UART is 1.8V,(as figure 1), then the level voltage is 3.3v of the ECSPI signals ,right?  but we change to UARTs from ECSPIs in IOMUX configuration, what is the level voltage of the UARTs now. (as figure 2)

[igorpadykov · Accepted solution]

Hi Bin

1. one can look at PMIC(BD71847MWV) datasheet for supported functionality

(seems there is no coin-battery option)

Avnet: Quality Electronic Components & Services 

2. level voltages are defined by balls "Power group" (not signal name) described in

Table 64. i.MX 8M Mini 14 x 14 mm functional contact assignments i.MX8MMini Datasheet
https://www.nxp.com/docs/en/data-sheet/IMX8MMCEC.pdf

Best regards
igor
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[bl]

thanks for your response...........