Technical data
4.6 Voltage Reference (VREF)
Pin Name Direction Function
34 VREF Input (Output) Core voltage reference
GR64 provides a voltage reference interface for user applications.
Level translators are integrated in the GR64 product. The integrated level translators
are referenced to an internal IO regulator on the Wireless CPU® side and to an
application voltage on the user side of the interface (VREF). There are two
implementations of VREF, dependent upon the users’ GR64 variant;
• VREF as an output (GR64001 variants)
• VREF as an input (GR64002 variants)
Figure 11: Level translator arrangement
The logic interface implementation will differ depending on the Wireless CPU® variant
used. The table below describes how to design the interface depending on what
Wireless CPU® is used.
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GR64 Integrators’ Manual
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