FLEX-IMX8M-Mini HARDWARE MANUAL
– VER 1.00 – JAN 31 2020
Page
10
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3.2. Power Management IC (ROHM BD71847)
The FLEX-IMX8M-Mini has an on onboard
ROHM BD71847
power management integrated circuit
(PMIC) that features a configurable architecture supporting the numerous outputs with various current
ratings as well as programmable voltage and sequencing required by the components on the FLEX-
IMX8M-Mini module.
Table 1
– PMIC Signal Description
CPU
BALL
CPU PAD
NAME
Pinmux
(mode)
Signal
I/O
Description
E13
I2C4_SDA
I2C4_SDA
SDA
I/O
I2C bus data line
D13
I2C4_SCL
I2C4_SCL
SCL
I
I2C bus clock line
B24
POR_B
POR_B
POR_B
O
PMIC Reset Signal
A24
PMIC_ON_R
EQ
PMIC_ON_RE
Q
PMIC_ON_R
EQ
I
PMIC Power on request Input
from processor (this signal has
an external pull-up resistor)
E24
PMIC_STBY
_REQ
PMIC_STBY_
REQ
PMIC_STBY
_REQ
I
PMIC Power standby request
input from processor
K24
NAND_DAT
A01
GPIO3_IO07
IRQ_B
O
PMIC Interrupt Signal
F24
RTC_RESET
_B
RTC_RESET_
B
RTC_RESET
_B
O
PMIC RTC Reset Signal
A26
RTC_XTALI
RTC_XTALI
C32K_OUT
O
32.768 KHz Clock
AG12
GPIO1_IO04
USDHC2_VSE
LECT
SD_VSELEC
T
O
SD Card Voltage Selection
Signal (on module only)
3.2.1. ROHM BD71847 Reset Signal
To perform a hard-reset of the FLEX-IMX8M-Mini a software reset signal can be implemented. By
connecting a Watchdog circuit on the carrier board by using PIN 238
Table 2
– PMIC Reset Signal Description
CPU
BALL
CPU PAD
NAME
Pinmux (mode)
Signal
V
I/O Description
AG13
GPIO1_IO02
WDOG1_B
WDOG_B
3V3
I
Connected to the
WDOG_B signal of
PMIC and i.MX8M-Mini
SoC
To perform a hard-reset of the FLEX-IMX8M-Mini an external circuit (for example a button or external
watchdog IC) can be integrated on the carrier board by using PIN 238.
Table 3
– PMIC Hard Reset Signal Description
Connector Signal
V
I/O Description
9
PWRON_B
1V8
I
Connected to Reset Power Signal of PMIC
