GR64 Integrators Manual
Page: 38/104
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Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable
The Wireless CPU has insufficient internal capacitance to supply the
large current peaks during GSM burst transmission - use the following
general guidelines in designing the application power supply.
Fit a low ESR electrolytic capacitor close to the Wireless CPU (>1,000
µ
F,
with an ESR < 100 mohm)
Ensure power supply to Wireless CPU line resistance is < 80 mohm
The Wireless CPU has approximately 40
µ
F of internal capacitance
across the VCC pins. During initial power-up the host power supply
will have to charge this capacitance to the operating voltage. This
initial in-rush current may exceed the Wireless CPU’s normal peak
current, sometimes greater than an order of magnitude higher
(depending upon the power supply design) for a short duration
(generally a few microseconds).
CAUTION
TIP
