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Rev 7.2
June 19, 2013
42
User Guide
Interfaces
5.1.3.
USB Interface
Aside from the serial interface, the Mini-B USB interface (USB slave) may also be used to directly
communicate with the FX Series.
Figure 23. Mini-B USB Connector
Refer to the following table for the pin description of the mini-B USB connector.
Table 25.
Mini-B USB Pin Description
Pin #
Signal
Description
1
VBUS
+5V Power supply
2
D-
Differential data interface positive
3
D+
Differential data interface negative
4
ID
Not connected
5
GND
Ground
The FXT009 USB slave interface complies with USB 2.0 protocol signaling but not with USB 2.0
electrical interface; while the FX100 can support both USB 2.0 protocol signaling and electrical
interface.
The USB interface features:
12Mbit/s full speed transfer rate for FXT009; 480Mbit/s high-speed transfer rate for FX100
3.3V type compatible
USB Soft-connect feature
USB Download feature (only supported by FX100)
CDC 1.1
– ACM compliant
Table 26.
USB Electrical Characteristics for FXT009
Parameter
I/O
Min
Typ
Max
Unit
VBUS
I
4.75
5
V
D-, D+
I/O
3
3.3
3.6
V
VBUS Input current consumption
100
mA
Table 27.
USB Electrical Characteristics for FX100
Parameter
I/O
Min
Typ
Max
Unit
VBUS
Input
4.75
5
V
D-, D+ (Low / Full speed)
Input High
2.00
3.30
3.60
V
Input Low
0
0.80
V
Output High
2.80
3.30
3.60
V
Output Low
0.30
V
