User's Manual l TQMa8MxML UM 0103 l © 2022, TQ-Systems GmbH
Page 29
3.2.5.4
I
2
C
All four I
2
C interfaces provided by the i.MX 8M Mini are routed to TQMa8MxML LGA pads.
All I
2
C devices on the TQMa8MxML are connected to I2C1. If more devices are connected to the I2C1 bus on the carrier board, the
maximum capacitive bus load according to the I
2
C standard has to be taken note of. Additional pull-ups should be provided at
the I
2
C bus on the carrier board, if required.
I2C4 is not available when Trust Secure Element SE050 is assembled.
i.MX 8M
Mini / Nano
24LC64T
I2C2
I2C3
I2C1
I2C4
PCA9450
SE050
I2C2
I2C1
I2C3
I2C4
PCF85063
LGA
SE97BTP
NP
3.3 V
Figure 10: Block diagram I
2
C
The following table shows the signals used by the I
2
C interfaces.
Table 21:
I
2
C signals
Signal
Direction
CPU ball
TQMa8MxML
Power group
Remark
I2C1_SCL
O
E9
C10
V_3V3
4.7 kΩ PU to 3.3 V on TQMa8MxML
I2C1_SDA
I/O
F9
C9
4.7 kΩ PU to 3.3 V on TQMa8MxML
I2C2_SCL
O
D10
D11
No PU on TQMa8MxML
I2C2_SDA
I/O
D9
D10
No PU on TQMa8MxML
I2C3_SCL
O
E10
C13
No PU on TQMa8MxML
I2C3_SDA
I/O
F10
C12
No PU on TQMa8MxML
I2C4_SCL
O
D13
C14
No PU on TQMa8MxML
I2C4_SDA
I/O
E13
D13
No PU on TQMa8MxML
The following table shows the I
2
C devices connected to the I2C1 bus on the TQMa8MxML.
Table 22:
Address assignment I2C1 bus
Component
Function
7-bit address
PCA9450
PMIC
0x25 / 010 0101b
24LC64T
EEPROM (optional)
0x57 / 101 0111b
PCF85063A
RTC (optional)
0x51 / 101 0001b
SE97BTP
EEPROM (Normal Mode)
0x53 / 101 0011b
EEPROM (Protection Mode)
0x33 / 011 0011b
Temperature sensor in EEPROM
0x1B / 001 1011b
SE050
Trust Secure Element (optional)
0x48 / 100 1000b
9:
I2C4 is not available when Trust Secure Element SE050 is assembled.
