Rtc Current Consumption; Uart Interfaces; Table 9: Minimum Supply Voltage Of The Rtc Module; Table 10: Mapping Of Smarc Ser Interfaces To I.mx8 Uarts - Kontron SMARC-sAMX8 User Manual

6.2. RTC Current Consumption

The module RTC (RV-8803) can operate down to 1.5 V, the i.MX8 RTC minimum supply voltage is 2.4 V. Due to the
higher current consumption of the i-MX8 RTC this part is not powered with the V_RTC voltage rail.

Table 9: Minimum Supply Voltage of the RTC Module

Ambient Current in V_BAT_R
temperature
25°C 40 µA (Max) / 240 nA (typical)
85°C
RV-8803 is powered through Schottky diode BAS70 from V_VDD_RTC pin S147 of SMARC connector.

6.3. UART Interfaces

Use following UART interfaces with control signals of i.MX8.

Table 10: Mapping of SMARC SER interfaces to i.MX8 UARTs

SER UART
SER0 UART0
SER1 M40 UART
SER2 UART1
SER3 M41 UART
There are additional UART available but it will require modification to the bootloader and BSP. The pinout from SMARC
will not be compatible with regular SMARC 2.0 carrier as they used pins that are defined for different functionality.

UART2 shares UART0_RTS_B and UART0_CTS_B
 UART3 shares GPIO2/CAM0_RST# and GPIO3/CAM1_RST#

UART4 shares LCD1_VDD_EN and LCD1_BKLT_EN
www.kontron.com
Minimum voltage for module RTC (RV-
8803) V_BAT_R/V_RTC
2.02V/1.69 V
2.08V/1.71 V
Kontron SMARC-sAMX8 - Rev. 1.2
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