User's Manual

Stollmann
E + V GmbH
BlueMod+B20
Hardware reference
Author: bg Date of Saving: 28.03.07 Ref: BlueMod+B20_HWreference_V101.doc Revision: 1.00 Page 10 of 10
3 Application Interface
3.1 Power Supply
The BlueMod+B20 requires a power supply with the following characteristics:
3.3V ± 0.1V low noise (10mV) >80mA peak
Due to the technological requirements and the pulsed radio transmission the supply
needs to be fed by an ultra fast (response time 20µs) linear regulator placed as
close as possible to the VSUP pin (22). Functionality has been verified with the fol-
lowing types: TOREX: XC6204x332xx or XC6401xx42xx
It is also recommended to place a low ESR capacitor with at least 10µF as close as
possible to the VSUP pin (22).
NOTE: You must ensure that during operation the supply voltage never drops below
3.0 V. Otherwise the flash contents (firmware and/or configuration data) can get lost.