Chrontel CH7219 Nota applicativa - Pagina 7

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CHRONTEL
Ra Resistor. When used in typeC accessory mode, this pin needs connect to CC0. It can be left open or pulled down
to the ground if unused.
• CC1_A
Port A USB Type-C Configure Channel 1
• GPIO5/CC0_B
General Purpose Input/output or Port B USB Type-C Configure Channel 0
• GPIO4/CC1_B
General Purpose Input/output or Port B USB Type-C Configure Channel 1
5
USB0_DN
6
USB0_DP
10
VBUS_DET
R5 0
37
Rd1
34
CC0_A/Vconn/VCONN_DET
35
Ra
36
CC1_A
46
GPIO5/CC0_B
47
GPIO4/CC1_B
2.7

HDMI Output

The TXCB/TXC, TX0B/TX0, TX1B/TX1, TX2B/TX2 signals are high frequency differential signals that need to be
routed with special precautions. Since those signals are differential, they must be routed in pairs.
2.7.1
Differential Pair Impedance
To match the external cable impedance and maintain the maximal energy efficiency it is important to meet the
impedance target of 100Ω ± 10% for the differential data/clock traces. The restriction of this impedance target is to
prevent any loss of signal strengths resulting from a reflection of unwanted signals. The impedance can be acquired
by proper design of trace length, trace width, signal layer thicknes
pairs should be routed on the top layer directly to the HDMI connector pads if possible.
2.7.2
Trace Routing Length
To prevent from capacitive and impedance loading, trace lengths should be kept as minimal as possible. Vias and
bends should always be minimized; inductive effects may be introduced, causing spikes in the signals. The CH7219
should be as close to the HDMI connector as possible.
206-1000-058
Rev. 0.1
16
USB0_DN_A7
17
USB0_DP_A6
20
CC_A5
19
VCONN_B5
18
VBUS
USB Type-C
Wire Solder
R1
91K
R2
10K
A5
CC1
B5
CC2
Plug
Ty pe-C Receptacle
Charging
Figure 9: CH7219 Plug and Receptacle Interface
2023-10-25
USB Type-C Receptacle
UFP_D Assignment C
5
USB0_DN
6
R3
USB0_DP
91K
10
VBUS_DET
33
Rd0
34
CC0_A/Vconn/VCONN_DET
37
R4
Rd1
36
10K
CC1_A
46
GPIO5/CC0_B
47
GPIO4/CC1_B
Receptacle
s, board dielectric, etc. The HDMI differential
AN-B058
A7, B7
USB0_DN
A6, B6
USB0_DP
A5
CC1
B5
CC2
A4, A9, B4, B9
VBUS
A5
CC1
B5
CC2
Ty pe-C Receptacle
Charging
7