User's Manual l MBa335x UM 0202 l © 2018, TQ-Systems GmbH
Page 14
4.1.6
Port-Expander
Illustration 9:
Block diagram Port-Expander
The MBa335x provides two port expanders. D900 only provides outputs, D901 only provides inputs.
Attention:
Depending on their primary function the port expanders should either be configured as inputs or
outputs to avoid functionality interference.
The port expanders are controlled by I2C0 by default as shown in section 4.1.2. I2C1 can be used with an assembly option.
The following table shows the signals used at the port expander.
Table 14:
Signals at Port-Expander
Device
Port
I/O
Signal
Target / Source
IO0
PMIC_SLEEP
→
PMIC Pin SLEEP on TQMa335x
IO1
LCD.PWR_EN
→
LVDS-CMD connector X18,
→
header X4 on MBa335x, optional PU/PD to VCC3V3
IO2
PCIE.PWR_EN
→
Pin ON/OFF of VCC3V3_MPCIE regulator N2300, 10 kΩ PD to GND, optional PU to VCC3V3
IO3
LVDS.SHTDN#
→
Pin SHTDN# of LVDS-Transmitter D2000, 10 kΩ PD to GND, optional PU to VCC3V3
IO4
LCD.BLT_EN
→
LVDS-COMD connector X18,
→
header X4 on MBa335x, 10 kΩ PD to GND, optional PU to VCC3V3
IO5
PCIE.WAKE#
→
Mini PCIe connector X22, 10 kΩ PU to VCC3V3, optional PD to GND
IO6
PCIE.DIS#
→
Mini PCIe connector X22, 10 kΩ PD to GND, optional PU to VCC3V3
D900
IO7
O
u
tp
u
t
n.c.
–
IO0
BUTTON.1#
→
Navigation button S5, 10 kΩ PU to VCC3V3
IO1
BUTTON.2#
→
Navigation button S6, 10 kΩ PU to VCC3V3
IO2
BUTTON.3#
→
Navigation button S7, 10 kΩ PU to VCC3V3
IO3
RTC_INT#
→
Pin SQW/INT# of RTC DS1339 on TQMa335x, 10 kΩ PU to VCC3V3
IO4
PMIC_INT
→
PMIC Pin IN1 on TQMa335x,
→
MBa335x header X6
IO5
TEMP_OS#
→
Pin EVENT# of EEPROM SE97BTP on TQMa335x, 10 kΩ PU to VCC3V3,
→
header X6 on MBa335x
IO6
n.c.
optional at ENET_1.INT#, see Table 32
D901
IO7
In
p
u
t
n.c.
optional at ENET_2.INT#, see Table 32
