Version 1.0
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2.6 I2C I/O Expander
The UltraZed-EG SOM uses a
Texas Instruments
TCA9534PWR
(16-pin TSSOP)
I2C and SMBUS Low-
Power I/O Expander. The Zynq Ult MPSoC controller required for I2C is named I2C1 and it exists
at MIO [25:24].
Table 10
– I2C1 TRM Pin Mapping
IO NAME
TRM SIGNAL NAME
NET NAME
PS_MIO24
SCL_OUT
MIO24_I2C1_SCL
PS_MIO25
SDA_OUT
MIO25_I2C1_SDA
Each of the ports of the I2C I/O Expander represents functions different control functions like resets and
power down. The following tables describes the connections and functionality of the ports of the I2C I/O
Expander.
Table 11
– Texas Instruments TCA9534 Pin Mapping
I/O EXPANDER NAME
I/O EXPANDER PIN
FUNCTION
NET NAME
A0
1
ADDRESS
GND
A1
2
ADDRESS
GND
A2
3
ADDRESS
GND
P0
4
P-PORT
P0_EMMC0_RST_N
P1
5
P-PORT
P1_USB0_RST_N
P2
6
P-PORT
P2_GEM3_RST_N
P3
7
P-PORT
P3_GEM3_PWDN_N
GND
8
GROUND
GND
P4
9
P-PORT
P4_I2CMUX_INT_N
P5
10
P-PORT
P5_PMBUS_ALERT_N
P6
11
P-PORT
P6_I2CMUX_RST_N
P7
12
P-PORT
P7_CC_RST_N
INT_N
13
INTERRUPT
MIO23_INT_N
SCL
14
SERIAL CLOCK
MIO24_I2C1_SCL
SDA
15
SERIAL DATA
MIO25_I2C1_SDA
VCC
16
POWER
+VCCO_PSIO0_500
Table 12
–TCA9534 P-Ports Function
I/O NAME
FUNCTION
DIRECTION Active-State
NET NAME
P0
eMMC Soft Reset
OUTPUT
LOW
P0_EMMC0_RST_N
P1
USB 2.0 ULPI PHY
Soft Reset
OUTPUT
LOW
P1_USB0_RST_N
P2
Gigabit Ethernet PHY Soft Reset
OUTPUT
LOW
P2_GEM3_RST_N
P3
Gigabit Ethernet Power-Down
OUTPUT
LOW
P3_GEM3_PWDN_N
P4
2-Ch I2C Switch/Mux Interrupt
INPUT
LOW
P4_I2CMUX_INT_N
P5
PMBUS Alert #
INPUT
LOW
P5_PMBUS_ALERT_N
P6
2-Ch I2C Switch/Mux Soft Reset
OUTPUT
LOW
P6_I2CMUX_RST_N
P7
Carrier Card Reset
OUTPUT
LOW
P7_CC_RST_N
The following figure describes the addressing required to access the I2C I/O Expander. Please see the
appropriate device datasheet for further details regarding accessing this device.
