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dc1836af
DEMO MANUAL DC1836A
harDware setup
JumPEr SETTingS
Tmr PEriOD: Sets the amount of time the user has to
hold down the pushbutton in order to cause a shutdown
event. It can either be set to 32ms or 3 seconds.
On FunCTiOn: Connect to ON BLOCKED to block the ON
pin falling edge from activating system turn-off. Connect
to ON ACTIVE to allow both the ON pin rising and falling
edges to activate system turn-on and turn-off, respectively.
Vin/On: Connects or disconnects VIN from ON. Unless
external circuitry has been connected to ON, for ON to
function correctly, this should be set to ON.
KiLL: Ties or separates
INT
from
KILL
. Set to TIE for au-
tomatic shutdown when a long press on the pushbutton
is detected.
LDO_in: Chooses the input to the onboard LT3060 regula-
tor. The user can either set it to VIN to have it connected
to the VIN pin or EXTERNAL in order to have it driven by
the LDO_IN turret. See the Operating Principles section.
Only for LED/monitor circuitry.
EXTErnAL COnnECTiOnS
Signal connections are made via the row of turret posts
along the edges of the board.
gnD: (3 turrets) These turrets are connected directly to
the ground planes.
Vin: Connect a 1.6V to 36V power supply to this turret.
On: Can be linked to VIN through the VIN/ON jumper, however,
can also be externally connected to a power source. Is con-
nected directly to the ON pin of the LTC2955. If the ON
function jumper is set to active, this pin can be used to turn
on the EN pin, or turn off the
EN
pin, depending on if the
demo board is populated with an LTC2955-1 or LTC2955-2.
PB
: This pin is already driven by the pushbutton, however,
if needed it can be driven by an external signal to simulate
a pushbutton press.
LDO_in: Can be used to provide the LT3060 with power
when the LDO_IN jumper is set to external.
LDO_OuT: Output from the LT3060. The state of this can
also be monitored at D1.
DigiTAL COnnECTiOnS
En/
EN
: Active high (LTC2955-1), or active low (LTC2955-
2) signal. Should go active either on a valid ON signal or
with a debounced PB press.
INT
: Goes low on a pushbutton press when EN/
EN
is
active. Can be tied to KILL to turn off the part.
KILL
: A low signal at this input will disable EN/
EN
. The
TMR period jumper sets how long the input signal must
be held low.
PgD: Power good output from the LTC2955. This pin
indicates the status of the ON pin in order to let the sys-
tem differentiate between pushbutton turn-on and supply
button turn-on events.
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