User's Manual l TQMa8MxML UM 0103 l © 2022, TQ-Systems GmbH
Page 47
3.2.9.9
PMIC
The characteristics and functions of all pins and signals have to be taken from the i.MX 8M Mini Reference Manual (2)
and the PMIC Data Sheet (7). The PMIC is connected to the I2C1 bus.
The following block diagram shows the connection between PMIC and i.MX 8M Mini:
i.MX 8M Mini / Nano
PCA9450
LGA
PMIC_STBY_REQ
PMIC_STBY_REQ
PMIC_STBY_REQ
PMIC_ON_REQ
PMIC_ON_REQ
PMIC_ON_REQ
WDOG#
GPIO1_IO02
PMIC_WDOG#
SCL / SDA
I2C1
I2C1
PMIC_WDOG#
PMIC_RST#
PMIC_RST#
100 k
Ω
V_3V3
Figure 24: Block diagram PMIC interface
The PMIC has I
2
C address
The following PMIC and power management signals are available on the TQMa8MxML LGA pads
Table 40:
PMIC signals
Signal
Direction
TQMa8MxML
Power group
Remark
PMIC_WDOG#
I
PU
AG13
V_3V3
•
Watchdog Reset input of i.MX 8M Mini
•
Deactivated by default on the part of the PMIC,
can therefore be used as GPIO1_IO02
PMIC_RST#
I
PU
E6
V_1V8_SNVS
•
Low-active with internal PU
•
See PMIC Data Sheet (7)
I2C1_SCL
I/O
C10
V_3V3
•
Can be used on carrier board, see chapter 3.2.5.4
I2C1_SDA
O
C9
Attention: Destruction or malfunction, PMIC programming
Improper programming of the PMIC may result in the i.MX 8M Mini or periphery being operated
outside its specification. This may lead to malfunctions, accelerated aging or destruction of the
TQMa8MxML.
