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phyCORE-167CR/167CS
48
PHYTEC Meßtechnik GmbH 2002 L-527e_8
The Voltage Supervisor Chip populating U13 controls switching
between VCC supply and the back-up battery. Furthermore, the
Voltage Supervisor Chip is used to generate a definite release of a
reset signal if the supply voltage VCC drops below 4.65 V. This
ensures the proper start-up of the microcontroller. The basic
characteristics of this IC are described in the appropriate Data Sheet,
which is available on the Spectrum CD.
All pins of the Voltage Supervisor Chip are routed to the
phyCORE-connector. The VPD voltage is available on the OUT pin
of the Voltage Supervisor Chip. In normal operation mode, this pin is
supplied by VCC (via a diode). Additionally, VBAT is routed via the
voltage divider R9/R10 to pin PFI. If VBAT = 3.3 V, a voltage of
1.65 V is available at PFI. If the voltage at PFI drops below 1.25 V,
the signal /PFO is released. The signals WDI and /PFO are available
at the phyCORE-connector pins X1D7 and X1C8.
Содержание phyCORE-167CR
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Страница 114: ...Published by PHYTEC Me technik GmbH 2002 Ordering No L 527e_8 Printed in Germany...