GR64 Integrators Manual
Page: 41/104
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5.6.2
VREF as an Input to the Wireless CPU
The GR64002 variants provide VREF as a reference input for the host side logic. This
enables users of varying technologies to connect directly to the GR64’s IO by
providing a reference voltage from their own application IO. The application must
apply their logic reference voltage on VREF and then connect their logic I/O’s directly
to GR64. This eliminates the need for level translators in the application.
Parameter
Min
Typ
Max
Unit
VREF input voltage
1.65
5.5
V
VREF load current
100
500
µ
A
5.7
Battery Charging Input (CHG_IN)
Pin
Name
Direction
Function
11
CHG_IN
Input
Battery charger power
For battery powered applications, the GR64 provides a charge input (CHG_IN) pin to
aid and support battery charging. A typical application would power the Wireless CPU
directly from a battery source connected to VCC (pins 1, 3, 5, 7, 9) then provide a dc
power source (CPS) to the CHG_IN connection (pin 11). The GR64 can control an
internal switching FET which creates a charging pathway to the battery. While power is
provided at CHG_IN, the battery charge can be maintained. If the power should fail or
be removed at CHG_IN, the application will be supported by the battery alone. When
CHG_IN voltage returns, the battery charging and maintenance will commence once
more.
Parameter
Min
Typ
Max
Unit
CHG_IN input voltage
4.5
5.5
6.0
V
CHG_IN current
500
mA
