NuMaker-HMI-MA35D1-S1
Nov. 2, 2022
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Rev 1.01
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3.1.4
RTC Wake-up Control
Battery Input Connector (J48): DC 3V battery input connector to provide an additional optional
power to keep the RTC power from the V
BAT
pin of MA35D1 when the system is power off.
RTC Wake-up Control Pins: The RTC_RPWR and RTC_nRWAKE pins of MA35D1 are the RTC
wake-up control pins to control the related DC/DC power whether output voltages or not.
Pin No.
Pin Name of MA35D1
Function Description
U1.E7
RTC_RPWR*
1
RTC wake-up output pin for external DC/DC (for
example, the PMIC device DA9062-3A (U2) on this
NuMaker-SOM-MA35D16A81 board) enable pin
control.
U1.G5
RTC_nRWAKE*
2*3
RTC wake-up interrupt input with internal pull-high
Note
*
1
: This RTC_RPWR output pin of MA35D1 is not wired directly to the SYS_EN input pin (pin
30) of PMIC device DA9062-3A (U2) on this NuMaker-SOM-MA35D16A81 board by default. (The
R89 resistor is NC, but R88 resistor is mounted on board by default)
Note
*
2
: This RTC_nRWAKE input pin is wired directly to the RTC Wakeup key button (SW3) on
NuMaker-BASE-MA35D1B1 board and the R90 resistor is mounted on board by default.
Note
*
3
: This RTC_nRWAKE pin is internal pull-high. If user does not use the RTC wake-up interrupt
function, please pull this pin to low (the R90 is mounted on board by default). In this condition, user
also needs to disable the PWRST bit (RTC_PWRCTL[6]) of the RTC Power Control Register by
clearing it for saving the RTC power consumption.
Table 3-1 RTC Power Control Pins of MA35D1
3.1.5
PMIC
PMIC Reset Key Button (SW1): Press this key to pull the nRESETREQ (pin 16) of PMIC device
DA9062-3A (U2) low to reset this PMIC device to supply the output voltages and control the
nRESET signal following the default power-on sequence stored in the internal configured
initialization.
PMIC (U2): After systerm power-on and pull the SYS_EN (pin 30) of the PMIC device DA9062-3A
(U2) to high, the PMIC will follows the configured power-on sequence to supply all necessary and
different voltages to the target chip MA35D16A887C and dedicated peripherals on this NuMaker-
SOM-MA35D16A81 board, and release the nRESET signal from low to high at the last one
sequence step.
U2.#
Pin Name
Output Voltage / MAX. Current
U2.26
VBUCK1
DC 1.2V ~ 1.34V / 2.5A
U2.27
VBUCK2
DC 1.2V / 2.5A
U2.25
VBUCK3
DC 3.3V / 2A
U2.24
VBUCK4*
1
DC 1.35V or 1.8V / 2A
U2.1
VLDO1
DC 3V / 100mA
U2.2
VLDO2
DC 1.8V / 300mA
U2.9
VLDO3
DC 2.5V / 300mA
U2.11
VLDO4*
2
DC 3.3V or 1.8V / 300mA
