6 POWER-ON SEQUENCE AND RESETTING
6 Power-on sequence and resetting
6.1 Power-on sequence
The RTL8720DN chip has requirements on the power-on sequence. It is recom-
mended that the voltage rise from 0 to 3.3V within 40mS.
Symbol
Parameter
Minimum
Typical
Maximum
Unit
TPRDY
3.3V ready
time
0.6
40
mS
CHIP_EN
CHIP_EN
ready time
0.6
40
mS
6.2 Resetting
When designing a plate of a module, you should reserve a reset IC on the pin
CHIP_EN. The preferable type of IC is BL8506-27CRO. The IC is packaged in the
form of SOT23. Refer to the circuit in the following figure (R30 is reserved and may
not be mounted).
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