User's Manual

2-6. LPO Clock (RTC_CLK)
2-7. Power-On Sequence
The AW-NH931 has four 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 carious operating
states. The timing value indicated are minimum required values: longer delays are also acceptable.
Note: The WL_SHUTDOWN_N and BT_SHUTDOWN_N are ORed in the AW-NH931. The diagrams
show both signals going high at the same time (as would be the case if both SHUTDOWN signals were
controlled by a single host GPIO). If two independent host GPIOs are used (on for WL_SHUTDOWN_N
and one for BT_SHUTDOWN_N), then only one of two signals needs to be high to enable the AW-
NH931 regulators.
Also note that the reset requirements for the Bluetooth core are also applicable for the FM core. In other
words, if FM is to be used, then the Bluetooth core must be enabled.
WL_SHUTDOWN_N: Used by the PMU (along with BT_SHUTDOWN_N) to decide whether to power
down the internal AW-NH931 regulators. If both the BT_SHUTDOWN_N and WL_SHUTDOWN_N pins
are low, the regulators will be disabled.
BT_SHUTDOWN_N: Used by the PMU (along with WL_SHUTDOWN_N) to decide whether to power
down the internal AW-NH931 regulators. If both the BT_SHUTDOWN_N and WL_SHUTDOWN_N pins
are low, the regulators will be disabled.
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