User Manual

TiWi-R2 TRANSCEIVER MODULE

DATASHEET

The information in this document is subject to change without notice.

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-R2 Power-up Sequence Requirements

1. No signals are allowed on the IO pins if no IO power is supplied, because the IOs are not 'fail safe’.

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 F

REF

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