Technical Note
9/19
BU7963GUW
www.rohm.com
2010.04 - Rev.A
© 2010 ROHM Co., Ltd. All rights reserved.
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Power Modes
BU7963GUW has three power modes.
1) Shutdown Mode
BU7963GUW goes to Shutdown Mode when XSD = ‘L’. All logic circuits are initialized in the Shutdown Mode.
All high-speed signaling channels are disabled, and the outputs keep Hi-Z status.
2) Standby Mode
BU7963GUW goes to Standby Mode when XSD = ‘H’ and PCLK is not provided. All high-speed signaling channel outputs
keep Hi-Z status. BU7963GUW is monitoring whether PCLK input is running or not and the link switches to Active Mode
when PCLK running is detected.
3) Active Mode
BU7963GUW goes to Active Mode when XSD = ‘H’ and PCLK is running. All high-speed signaling channels are enabled.
Table 10. Power Modes
Power Mode
Input Operation
XSD PCLK
Functions
MSDL3
Terminals
Shutdown
‘L’
Static (‘L’ or ‘H’)
Initialized
Disabled (Hi-Z)
Standby
‘H’
Static (‘L’ or ‘H’)
PCLK detection
Disabled (Hi-Z)
Active
‘H’
Clock input is active
PCLK detection
Normal operation
(P2S conv)
Enabled
4) Power Modes Transition
Fig.6 shows the transition of power modes.
Fig.6. Power Modes Transition
Shutdown
Standby
Active
XSD = ”L”
XSD = ”H”
PCLK input
stopped
PCLK input
detected
