BCM89359 Advance Data Sheet
Bluetooth Power Management Unit
During the low-power shut-down state, provided VDDIO remains applied to the BCM89359, all outputs are
tristated, and most input signals are disabled. Input voltages must remain within the limits defined for normal
operation. This is done to prevent current paths or create loading on any digital signals in the system and
enables the BCM89359 to be fully integrated in an embedded device to take full advantage of the lowest
power-saving modes.
Two BCM89359 input signals are designed to be high-impedance inputs that do not load the driving signal
even if the chip does not have VDDIO power supplied to it: the frequency reference input (WRF_TCXO_IN)
and the 32.768 kHz input (LPO). When the BCM89359 is powered on from this state, it is the same as a
normal power-up, and the device does not contain any information about its state from the time before it was
powered down.
Wideband Speech
The BCM89359 provides support for wideband speech (WBS) using on-chip SmartAudio technology. The
BCM89359 can perform subband codec (SBC), as well as mSBC, encoding and decoding of linear 16 bits at
16 kHz (256 Kbps rate) transferred over the PCM bus.
Broadcom®
September 9, 2014 • 89359-DS100-R
Page 35
BROADCOM CONFIDENTIAL
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