DS1227 Datasheet, PDF (4/20 Pages) Dallas Semiconductor – KickStarter Chip

DS1227
DS1227 +5V PASS-THROUGH MODE CONFIGURATION Figure 2
DS1227
KICKSTARTER
+
+5
10 uF
–
(typ.)
V_DCI
BOOST
V_CC01
V_CC02
V_CC03
V_DCO
GND
DS1227 +6V PASS-THROUGH MODE CONFIGURATION Figure 3
DS1227
KICKSTARTER
+
+6V
–
10 uF
(typ.)
V_DCI
BOOST
V_CC01
V_CC02
V_CC03
V_DCO
GND
KICKSTARTER OPERATION
A conceptual block diagram of the internal circuitry of
the DS1227 is illustrated in Figure 4 for reference. While
in an initial power down state, the DS1227 will sense ac-
tivity from an external stimulus applied to one of three
input pins and kickstart system power by applying volt-
age from the input power source to the primary V_CCO
output (V_CCO1). Activity detected on any of the ON1,
RXIN, and SENSE pins initiates the kickstarting action.
When kickstarting occurs and the DS1227 is configured
for boost operation, the on-chip, step-up DC-to-DC con-
verter is started and the voltage on V_DCO will be boosted
from its initial V_BAT level to V_DCON before V_CCO1 is
turned on. If the DS1227 is configured for voltage
Pass-Through operation, then the DC-to-DC converter
will remain disabled and voltage on the V_DCO line will be
switched to the V_CCO1 pin immediately following the de-
tection of an active transition on a stimulus input.
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