Panasonic KX-MB262CX Service Manual page 66

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