S1R72105 Technical Manual
Rev.1.0
EPSON
89
Fig.2. USB Connection Diagram
1) Connect the V
BUS
pin to the V
BUS
pin of the connector by providing chattering prevention circuit.
2) The XPUENB outputs LOW by inputting 5V in V
BUS
pin and setting the EnPullUp(bit1) bit of the
USBCommon register (0Ah).
XPUENB is asserted when USB is ready for operation after checking that V
BUS
is HIGH (5V).
3) How to handle DP and DM pins.
Add Zener diode for electrostatic protection onto the connector side.
Add 24
Ω
resistor for adjusting impedance.
Add 22pF condensor for adjusting edge rate.
Add a diode onto the pin side to protect from a short in the wiring of the USB cable.
S1R72105
V
BUS
V
BUS
D-
D+
GND
USB Connector
Series B Receptacle
100k
Ω
GND
GND
0.1
µ
F
330k
Ω
GND
GND
22pF
GND
22pF
GND GND
1SS133
1SS133
1SS133
1SS133
3.3V
3.3V
3.3V
24
Ω
24
Ω
10k
Ω
5.6k
Ω
2SA
1.5k
Ω
XPUENB
DP
DM
GND
NNCD5.6LG