User's Manual

TiWi-BLECA TRANSCEIVER MODULE
USER MANUAL
The information in this document is subject to change without notice.
TiWi-BLECA Copyright © 2013 LS Research, LLC Page 15 of 32
WLAN POWER-UP SEQUENCE
The following sequence describes device power-up from shutdown. Only the WLAN Core is enabled; the
Bluetooth and FM cores are disabled.
Figure 3 TiWi-BLECA Power-up Sequence Requirements
1. No signals are allowed on the IO pins if no IO power is supplied, because the IOs are not 'failsafe’.
Exceptions are CLK_REQ_OUT, SLOWCLK, XTALP, and AUD_xxx, which are failsafe and can
tolerate external voltages with no VDDS and DC2DC".
2. VBAT, VIO, and SLOWCLK must be available before WL_EN.
3. Twakeup = T1 + T2
The duration of T1 is defined as the time from WL_EN=high until Fref is valid for the SoC. T1=~55ms
The duration of T2 depends on:
Operating system
– Host enumeration for the SDIO/WSPI
– PLL configuration
– Firmware download
– Releasing the core from reset
– Firmware initialization