USER MANUAL
TCM 515Z – 2.4 GHZ IEEE 802.15.4 Transceiver
© 2017 EnOcean | www.enocean.com
F-710-017, V1.0
TCM 515Z User Manual | v1.6 | September 2017 | Page 23/46
4.5
Power supply requirements
In order to provide a good radio performance, great attention must be paid to the power
supply and a correct layout and shielding. It is recommended to place a 22 µF ceramic ca-
pacitor between VDD and GND close to the module (material: X5R, X7R, min 6.3 V to avoid
derating effects).
In addition, an HF SMD EMI Suppression Ferrite Bead such as the Würth WE-CBF HF SMD
EMI Suppression Ferrite Bead (Würth order number 742863160) shall be inserted in the
power supply line.
For best performance it is recommended to keep the ripple on the power supply rail below
10 mVpp.
TCM 515Z integrates approximately 10 uF of capacitance for filtering the internal supply
voltage bus. The power supply architecture has to be capable of supplying sufficient current
to charge this capacitance during power up.
