System Components
23-42 ADSP-214xx SHARC Processor Hardware Reference
A simple power-up reset circuit is shown in Figure 23-13 using the
ADM809-RART reset generator. The ADM809 provides an active low
RESET signal whenever the supply voltage is below 2.63 V. At power-up, a
240 ms active reset delay is generated to give the power supplies and oscil-
lators time to stabilize.
Another part, the ADM706TAR, provides power on RESET and optional
manual RESET. It allows designers to create a more complete supervisory
circuit that monitors the supply voltage. Monitoring the supply voltage
allows the system to initiate an orderly shutdown in the event of power
failure. The ADM706TAR also allows designers to create a watchdog
timer that monitors for software failure. This part is available in an 8-lead
SOIC package. Figure 23-14 shows a typical application circuit using the
ADM706TAR.
Figure 23-13. Simple Reset Generator
V
CC
RESET
GND
ADM809-RART
V
DDEXT
GND
V
DDEXT
10μF
V
DDINT
V
DDINT
S
RESET
ADSP-214xx
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