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i.MX8 SMARC SOM Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
P122
NC
(I2C_PM_DAT)
PMIC_I2C_SDA/
BG51
IO, 1.8V CMOS
2.2K PU
NC.
Note: Optionally connected to
PMIC_I2C_
SDA
2.7.16
Control Signals
SMARC V2.1.1 specification supports control Signals, for more details on SMARC Control Signals pinouts on SMARC
Edge connector, refer below table:
SMARC
Pin No.
SMARC Edge
Signal Name
CPU Ball Name/
Pin Number
Signal Type/
Termination
Description
P123
BOOT_SEL0#
NA
I, 1.8V CMOS
10K PU
Boot Media Select [2:0]#
000
-FlexSPI (Optional)
001
-eMMC (Default)
011
-microSD
110
-Standard SD
0
-Floating &
1-
GND
P124
BOOT_SEL1#
NA
I, 1.8V CMOS
10K PU
P125
BOOT_SEL2#
NA
I, 1.8V CMOS
10K PU
P126
RESET_OUT(GPIO0_10) M41_I2C0_SCL/
AR45
I, 1.8V CMOS
RESET OUT from CPU to all other
peripherals.
P127
RESET_IN#
POR_B/
BE49
I, 1.8V CMOS
100K PU
Hard RESET Input to SOM.
P128
ON_OFF_BUTTON
ON_OFF_
BUTTON/ BE47
I, 1.8V CMOS
Power ON /OFF Input to SOM.
S150
VIN_PWR_BAD#
NA
I, 5V CMOS
10K PU
Power bad indication from Carrier
board. Module and Carrier power
supplies shall not be enabled while
this signal is held low by the Carrier.
S153
CARRIER_STBY#
NA
O, 1.8V CMOS
10K PU
Carrier power should be enabled only
after CARRIER_STBY# goes High.
S154
CARRIER_PWR_ON
NA
O, 1.8V CMOS
10K PU
Carrier power should be enabled only
after CARRIER_PWR_ON goes High.
S155
FORCE_RECOV#
NA
I, 1.8V CMOS
10K PU
Low on this pin allows non-protected
segments of Module boot device to be
rewritten / restored from an external
USB Host on Module USB0. The
Module USB0 operates in Client Mode
when in the Force Recovery function is
invoked.
S157
TEST_MODE_SELECT
TEST_MODE_
SELECT/BC49
I, 1.8V CMOS
10K PU
Only for Module vendor specific use.
2.7.17
Power and GND
The i.MX8M SMARC SOM works with 5V power input (VCC) from SMARC PCB Edge Connector and generates all other
required powers internally On-SOM itself. i.MX8M SMARC SOM also supports coin cell power input (VDD_RTC) from
SMARC PCB Edge Connector to On-SOM RTC controller for real time clock.
For more details on Power & GND Signals pinouts on SMARC PCB Edge connector, refer the below table.