User's Manual l MBa6ULxL UM 0101 l © 2018, TQ-Systems GmbH
Page 9
4.1.4
Port replicator PCA9554BS signals
The port replicator PCA9554BS with I
2
C address
0x22
provides the following signals:
Table 6:
Port replicator PCA9554BS signals
I/O port
Direction
Function
Remark
IO0
O
ENET1_RST#
–
IO1
O
ENET2_RST#
–
IO2
O
BOOT_CFG_EN#
–
O
PWR_EN_3V3_DISPLAY
Default
IO3
I
ENET1_INT#
Alternative
O
PWR_EN_1V5
Default
IO4
I
ENET2_INT#
Alternative
IO5
O
LCD.PWRCTRL
–
IO6
O
LCD.WAKE
–
IO7
O
PCIE_1.DIS#
Alternative: PCIE_2.DIS#
Attention:
I2C4 bus
Attention when using I2C4. Since the PMIC can be addressed via I2C4,
errors on the bus can lead to instabilities of the MBa6ULxL!
4.1.5
Temperature sensor / SPD EEPROM
Since there is already a temperature sensor SE97BTP on the TQMa6ULxL, no temperature sensor is provided on the MBa6ULxL.
4.1.6
RTC supply
The TQMa6ULxL provides a discrete RTC. Another RTC is provided by the i.MX6ULx on the TQMa6ULxL.
Both RTCs are supplied via the LICELL.
A lithium battery type CR2032 with very low self-discharge is provided on the MBa6ULxL as a backup supply for both RTCs.
The increased current consumption must be considered, if the i.MX6ULx RTC is used.
This leads to a fast battery discharge. More information can be found in the User’s Manual of the TQMa6ULxL.
For the RTCs installed on the MBa6ULxL the following applies:
Table 7:
RTC supply, components
Parameter
Value
Remark
Coin cell
2.1 V to 3.7 V, typical 3.0 V, 220 mAh
–20 °C to +60 °C
Current consumption RTC
See TQMa6ULxL User’s Manual
Depends on RTC used
