Data Sheet

24
FORM NO.: FR2-015_ A Responsible Department：WBU Expiry Date: Forever
The information contained herein is the exclusive property of AzureWave and shall not be distributed, reproduced, or disclosed
in whole or in part without prior written permission of AzureWave.
3.5 Power up Timing Sequence
The AW-CM390SM has three signals that allow the host to control power consumption by enabling
or disabling the Bluetooth, WLAN, and internal regulator blocks. These signals are described below.
Additionally, diagrams are provided to indicate proper sequencing of the signals for various
operational states. The timing values indicated are minimum required values; longer delays are also
acceptable.
Note:
• The WL_REG_ON and BT_REG_ON signals are ORed in the AW-CM390SM. The diagrams
show both signals going high at the same time (as would be the case if both REG signals were
controlled by a single host GPIO). If two independent host GPIOs are used (one for
WL_REG_ON and one for BT_REG_ON), then only one of the two signals needs to be high to
enable the AW-CM390SM regulators.
• The AW-CM390SM has an internal power-on reset (POR) circuit. The device will be held in reset
for a maximum of 110 ms after VDDC and VDDIO have both passed the POR threshold. Wait
at least 150 ms after VDDC and VDDIO are available before initiating SDIO accesses.
Description of Control Signals
The AW-CM390SM has two signals that enable or disable the Bluetooth and WLAN circuits and the
internal regulator blocks, allowing the host to control power consumption.
Power-Up/Power-Down/Reset Control Signals
Signal
Description
WL_REG_ON
This signal is used by the PMU (with BT_ REG_ON ) to power up the WLAN
section. It is also ORgated with the BT_
REG_ON input to control the internal
AW-NMNF regulators. When this pin is high, the regulators are enabled and
the WLAN section is out of reset. When this pin is low, the WLAN section is
in reset. If BT_
REG_ON and WL_ REG_ON are both low, the regulators are
disabled. This pin has an internal 200 kΩ pull-down resistor that is enabled
by default. It can be disabled through programming.