Specifications

Figure 8: Typical VREF level translation implementation in a GR64002
One drawback of this solution is that VREF cannot be used by the application to
determine whether the Wireless CPU is powered on or not. See
3.6.2 below for more
information.
3.6 Monitor “Power On” State
The power state of the Wireless CPU can be verified in two ways; either HW or SW.
The HW-determination depends on what product and variant is used, but the SW-
determination is the same for all products (AT+CFUN). See AT-command
specification for more information on the AT+CFUN-command.
3.6.1 GS64 and GR64001 HW-detection
These products can determine the HW status of the Wireless CPU by monitoring the
VREF signal. A high level VREF
HIGH
-0.3V indicates unit powered on. A low level <0.4V
indicates unit powered off.
GR64001 GS64 Unit
VREF
HIGH
2.8 1.8 V
Gx64 APPLICATION NOTE
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.
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Power Management
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