User's Manual

LZT 123 1836 40
5.7 Voltage Reference (VREF)
Pin Name Direction Function
65 VREF Input Host application voltage reference
The GS64 has level shifter circuits on each digital IO interface. This allows
applications with different logic technology to interface to the module without having
to perform voltage level-shifting on the host circuitry. VREF is connected to the host-
side level-shifters. This pin must be connected to your digital IO voltage source.
VREF Input
Parameter Min Typ Max Unit
VREF input voltage 1.8 5.2 V
VREF load current 0.1 50
µA
Figure 5.7-1 Level shifter arrangement