Ibase SMARC-EVK1 Manual de usuario Pagina 46

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SMARC Evaluation Kit
4.2.15. I2C Interface
I2C signals
Pin
Signal Name
I/O
Type
Power Rail
Description
P121
I2C1_SCL_1V8
O
OD
1.8V
I2C Clock signal for Audio CODEC
P122
I2C1_SDA_1V8
I/O
OD
1.8V
I2C Data signal for Audio CODEC
S5
I2C2_SCL
O
OD
3.3V
I2C Clock signal for Camera
S7
I2C2_SCL
I/O
OD
3.3V
I2C Data signal for Camera
S139
I2C3_SCL
O
OD
3.3V
I2C Clock signal for LCD Display
S140
I2C3_SCL
I/O
OD
3.3V
I2C Data signal for LCD Display
S48
I2C4_SCL
O
OD
3.3V
I2C Clock signal for PCI express
S49
I2C4_SCL
I/O
OD
3.3V
I2C Data signal for PCI express
4.3. Layout recommendations
1.1 Signal impedance recommendation
Signal Group
Impedance
Layout Tolerance (±)
All signals, unless specified
50 Ω Single End
10%
PCIe, USB Diff signals
90 Ω Differential
10%
Diff signals: LVDS, SATA, HDMI, DDR, MIPI
(CSI & DSI), MLB, PHY IC to Ethernet
Connector
100 Ω Differential
10%
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