Vref As An Input To The Wireless Cpu; Battery Charging Input (Chg_In) - Wavecom GR64 GSM/GPRS Integrator's Manual

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
VREF input voltage
VREF load current
5.7

Battery Charging Input (CHG_IN)

Pin
11
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).
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
CHG_IN input voltage
CHG_IN current
GR64 Integrators Manual
Page: 41/104
Min
1.65
Name Direction
CHG_IN Input
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Typ
100
Function
Battery charger power
Min Typ
4.5 5.5
Max Unit
5.5 V
µA
500
The GR64 can control an
Max Unit
6.0 V
500 mA