SPDPXXD375 Datasheet, PDF (6/11 Pages) Sensitron – DC Solid State Power Controller Module

SENSITRON
SEMICONDUCTOR
SPDPXXD375 SERIES
TECHNICAL DATA
DATASHEET 5022, Rev-
The watchdog timer operates from its own internal clock so a failure of the main clock will not stop the watchdog
timer. The code programmed in the microcontroller will periodically reset the watchdog timer preventing it from
timing out. If the code malfunctions for any reason, the watchdog timer is not reset and it times out. When the
watchdog timer times out, it resets the microcontroller. Since the code is designed to detect levels and not
edges, the output of the module, and therefore the output of the SPDPXXD375, immediately reflects the
command on its input.
The “Control & Protection Circuitry” block also has the ability for the user to adjust the current rating by varying
the trip point with a resistor between the “I²t ADJ” pin and the “TRIM COMMON” pin and to adjust the Instant
Trip current level with a resistor between the “INSTANT TRIP ADJ” pin and the “TRIM COMMON” pin. See
Figures 4 and 5 to select the appropriate resistor for adjusting the current rating for the SPDP03D375 and
SPDP10D375 models, respectively. See Figures 6 and 7 to select the appropriate resistor for adjusting the
Instant Trip current level for the SPDP03D375 and SPDP10D375 models, respectively.
When setting the current rating, select a resistor according to Figures 4 and 5 for 10% above the desired rating.
Example: to set the SPDP03D375 to a rating of 2 Amps, look on Figure 4 for 2.2 Amps and select a resistor of
2.7K.
Figure 4 – SPDP03D375 Current Rating Trim Resistor Selection
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