Power Management Ic (Rohm Bd71847); Rohm Bd71847 Reset Signal; Table 1 - Pmic Signal Description; Table 2 - Pmic Reset Signal Description - TechNexion FLEX-IMX8M-Mini Product Manual

FLEX-IMX8M-Mini HARDWARE MANUAL – VER 1.00 – JAN 31 2020

3.2. Power Management IC (ROHM BD71847)

The FLEX-IMX8M-Mini has an on onboard
(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 CPU PAD
BALL NAME
E13 I2C4_SDA
D13 I2C4_SCL
B24 POR_B
PMIC_ON_R
A24
EQ
PMIC_STBY
E24
_REQ
NAND_DAT
K24
A01
RTC_RESET
F24
_B
A26 RTC_XTALI
AG12 GPIO1_IO04

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 CPU PAD
BALL NAME
AG13 GPIO1_IO02
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
9 PWRON_B
ROHM BD71847
Pinmux
Signal
(mode)
I2C4_SDA SDA
I2C4_SCL SCL
POR_B POR_B
PMIC_ON_RE PMIC_ON_R
Q EQ
PMIC_STBY_ PMIC_STBY
REQ _REQ
GPIO3_IO07 IRQ_B
RTC_RESET_ RTC_RESET
B _B
RTC_XTALI C32K_OUT
USDHC2_VSE SD_VSELEC
LECT T
Pinmux (mode) Signal
WDOG1_B WDOG_B
V I/O Description
1V8 I Connected to Reset Power Signal of PMIC
power management integrated circuit
I/O Description
I/O I2C bus data line
I I2C bus clock line
O PMIC Reset Signal
PMIC Power on request Input
I from processor (this signal has
an external pull-up resistor)
PMIC Power standby request
I
input from processor
O PMIC Interrupt Signal
O PMIC RTC Reset Signal
O 32.768 KHz Clock
SD Card Voltage Selection
O
Signal (on module only)
V I/O Description
Connected to the
WDOG_B signal of
3V3 I
PMIC and i.MX8M-Mini
SoC
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