Panasonic KX-MB772CX

KX-MB262CX/KX-MB772CXKX-MB262CX/KX-MB772CX
USB (Universal Serial Bus) blockUSB (Universal Serial Bus) block
DescriptionDescription
This is a USB block for data This is a USB block for data
communication with PC.communication with PC.
Two signal lines (D+/D-) are differential Two signal lines (D+/D-) are differential
signals which work in reverse phase.signals which work in reverse phase.
VBUS: CN300 1pinVBUS: CN300 1pin
D+: CN300 3pinD+: CN300 3pin
D-: CN300 2pinD-: CN300 2pin
GND: CN300 4pinGND: CN300 4pin
Circuit DiagramCircuit Diagram
Sequence of normal operationSequence of normal operation
When USB cable from PC is When USB cable from PC is
connected to CN300, VBUS voltage goes up connected to CN300, VBUS voltage goes up
to 5V, and IC300 recognize the connection with PC.to 5V, and IC300 recognize the connection with PC.
Then D+ becomThen D+ becom
es about 3V es about 3V
: waveform : waveform
(1)-1(1)-1
The D+ becomes 0VThe D+ becomes 0V
, then communication between IC300 and PC is star, then communication between IC300 and PC is star
ted : ted :
waveform (2)-1waveform (2)-1
When a few seconds elapsed after USB cable was inserted into CN300 ,the When a few seconds elapsed after USB cable was inserted into CN300 ,the
unit enters stand-by mode.unit enters stand-by mode.
When PC is at Hi-SWhen PC is at Hi-S
peed , waveforms apeed , waveforms a
re re
(1)-1 ~ (1)-4.(1)-1 ~ (1)-4.
When PC is at Full When PC is at Full
Speed ,waveforms are (2)-1 ~ (2)-4.Speed ,waveforms are (2)-1 ~ (2)-4.