SANEI ELECTRIC SK1-21A, Technical Manual

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４１
SK1-21A/31A
7
．
Interfaces
7- 1 ． USB
(1) Pin layout
Connector: Mini-B type 5-PIN
This printer is equipped with USB version 2.0 for high speed data transfer.
The device class is “Printing Device.”
Pin Signal Direction Function
1 VBUS - Detect connect/disconnect of USB
2 D- I/O USB data (-)
3 D+ I/O USB data (+)
4 N.C
5 GND - GND
（
2
）
Electronic characteristic
Parameter Signal Conditions Min. Max. Unit
（
Power supply voltage
）
VBUS 4.40 5.25 V
（
Input level
）
Differential input sensitivity VDI |(D+)-(D-)| 0.2 V
Differential common mode
range
VCM Including VDI 0.8 2.5 V
Single end receiver threshold VSE 0.8 2.0 V
（
Output level
）
“L”Level VOL RL of 1.5k Ω to
3.6V
0.3 V
“H”Level VOH RL of 15k Ω to
GND
2.8 3.6 V
1 5