Cirrus Logic CS1631 - Manual (Page 43)

CS1630/31
DS954F3 43
6.32 Configuration 50 (Config50) – Address 82
6.33 Configuration 51 (Config51) – Address 83
7 6 5 4 3 2 1 0
OVP_CNT2 OVP_CNT1 OVP_CNT0 OVP_LAT OVP_TYPE OVP_BLANK2 OVP_BLANK1 OVP_BLANK0
Number Name Description
[7:5] OVP_CNT[2:0]
Sets the second stage OVP fault counter threshold used when declaring a
fault.
0 = Force OVP fault (debug only)
1-7 = Number of times an OVP fault has to occur consecutively before
the IC will enter a fault state.
[4] OVP_LAT
Configures second stage OVP fault type.
0 = Unlatched fault
1 = Latched fault
[3] OVP_TYPE
Selects the type of blanking for the second stage OVP. When bit
OVP_TYPE is set to T2 offset, the blanking time is always equal to the cor-
responding channel’s previous T2 switching cycle time minus an offset of
500ns.
0 = Fixed time blanking mode
1 = T2 offset blanking mode.
[2:0] OVP_BLANK[2:0]
Configures fixed time blanking interval t
OVP
for output open protection,
OVP. The value is an unsigned integer in the range of 0 value7.
7 6 5 4 3 2 1 0
RESTART5 RESTART4 RESTART3 RESTART2 RESTART1 RESTART0 FAULT_SLOW FAULT_SHDN
Number Name Description
[7:2] RESTART[5:0]
Set fault restart time T
Restart
for second stage faults that are set as unlatched
type. If slow restart bit FAULT_SLOW is enabled, then
else
[1] FAULT_SLOW
Configures slow restart for second stage faults that are set at unlatched type.
0 = Disable slow restart; use 25.6 s timer for restart time countdown
1 = Enable slow restart; use 40.96ms timer for restart time countdown
[0] FAULT_SHDN
Selects which stages to disable when a fault event occurs in the second stage.
0 = Shutdown second stage only
1 = Shutdown boost stage and second stage
t
OVP
1 s OVP_BLANK  + [2:0] 0.5 s   =
T
Restart
RESTART[5:0] 40.96ms  =
T
Restart
RESTART[5:0] 25.6 s  =