- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
208
2. Timing for switch from LL to INT when external VD input is no longer detected (INTSW input =High)
For a fixed period of time (1VD period or longer), Ext-VD presence/absence detection is performed. If Ext-VD
absence is detected, “RESET output” is switched from High to Low and the CXD3172AR is reset. In addition,
for the period where “RESET output”=Low, “INT/LL Change signal output” is switched from High to Low. (The
“INTSW input” at this time is always High.)
Fig 12.2-18 Timing for switch from LL to INT based on external VD input (INTSW input =High)
3. Timing for switch from INT to LL with external VD input (INTSW input : Low => High)
While “INTSW=Low”, “INT/LL Change signal output” is output at Low, regardless of whether Ext-VD is present
or absent. After “INTSW input” switches from Low to High, Ext-VD presence/absence detection begins. If
Ext-VD presence is detected, then “RESET output” is switched from High to Low and the CXD3172AR is
reset. In addition, for the period where “RESET output”=Low, “INT/LL Change signal output” is switched from
Low to High. (External VD remains input during this time.)
Fig 12.2-19 Timing for switch from INT to LL based on INTSW input
INTSW
input
EXT-VD
input
RESET
output
INT/LL
Change signal
output
500ns Over
Don't Care
LL
INT
Don't Care
High
Detect point
pulse
No pulse
INTSW
input
EXT-VD
input
RESET
output
INT/LL
Change signal
output
Don't Care
500ns Over
Don't Care
LL
INT
Don't Care
Detect
point
Not Detect