Vref As An Output From The Wireless Cpu - Wavecom GR64 GSM/GPRS Integrator's Manual

Table 5: Interface implementation description
GR64
variant
001
002
5.6.1

VREF as an Output from the Wireless CPU

The GR64001 variants provide a 2.8V VREF reference output to the host side level
translator devices. This enables legacy users, and users of older interface technology
to connect directly to the GR64's IO. In this arrangement VREF can be used as a
further level translator reference in the users application circuits, or to power external
circuits, since it has a 75mA current sourcing capability.
Parameter
VREF output voltage
VREF load current
GR64 Integrators Manual
Page: 40/104
Application Logic
Voltage Level (V )
LOGIC
2.6 > V > 3.0
LOGIC
2.6 < V < 3.0
LOGIC
1.8 ≤ V ≤ 5.0
LOGIC
Min
2.74
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Implementation Requirements
The application must implement level
translators to re-reference its logic level to
the logic level used by the Wireless CPU
interface.
Connect the application logic signals directly
to the GR64001 Wireless CPU interface.
Connect the application logic supply voltage
V to VREF of the GR64002 Wireless CPU,
LOGIC
and connect the application logic signals
directly to the Wireless CPU interface.
Nom
2.8
Max Unit
2.86 V
75 mA