Sony Ericsson GS64 - Manual (Page 36)

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5.6 Voltage Reference (VREF)
Pin Name Direction Function
65 VREF Input Core voltage reference
GS64 provides a 1.8V voltage as a reference to the host side device. The VREF
reference may be used by legacy users, or users of different interface voltage
technology, to implement level-shifter circuits through which IO signals can be safely
interconnected.
VREF output
Parameter Min Nom Max Unit
VREF output voltage 1.74 1.8 1.86 V
VREF load current 20 mA
Figure 5.6-1 Typical Level shifter arrangement using VREF