difference should be controlled less than 0.15 mm, avoiding right-angle traces.
•
Traces between differential pairs must be parallel with equal length, and the length
difference should be controlled less than 10 mm, avoiding right-angle traces.
•
The two pairs differential signal lines should be routed on the layer that is closest to
the ground layer, and protected with GND all around.
5.6. I
2
C Interface
FM101-CG
series module supports 1-way I
2
C interface, and the standard I
2
C
specification, version 3.0 is applied.
I
2
C external pull-up is required. See
for reference design.
Table 21. I
2
C pin definition
Pin Name
Pin
Number
Type
Description
I2C_SDA
42
OD
I
2
C data signal
I2C_SCL
43
OD
I
2
C clock signal
5.7. PCM and I
2
S Digital Audio Interface
The
FM101-CG
module provides a digital audio interface (PCM/I
2
S) for communication
with external codec and other digital audio devices.
5.7.1. PCM Interface Definition
PCM interface signals include transmission clock PCM_CLK, frame synchronization signal
PCM_SYNC, and input and output PCM_IN/PCM_OUT.
5. Functional Interface
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