User Manual

TiWi-R2 TRANSCEIVER MODULE

DATASHEET

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

BLUETOOTH POWER-UP SEQUENCE

The following sequence describes device power up from shutdown. Only the Bluetooth core is enabled;

the WLAN core is disabled.

Notes:

1. (A) After this sequence is completed, the device is in the low VIO-leakage state while in shutdown

2. The DC2DC(1.8V) signal can be monitored on BT_FUNC2 Module Pin (#41)

3. DC_REQ, CLK_REQ, and F

REF

are internal signals shown for reference only

Figure 5 Bluetooth Power-up Sequence

Power up requirements:

1. No signals are allowed on the IO pins if no IO power 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. VDDS and SLOWCLK must be stable before releasing BT_EN.

3. Fast clock must be stable maximum 55 ms after BT_EN goes HIGH.