BCM4330 Preliminary Data Sheet
Bluetooth Power Management Unit
LPO
VDDIO
Host IOs unconfigured
Host IOs configured
HostResetX
T1
BT_REG_ON
T4
BTH IOs unconfiguredBTH IOs configured
BT_GPIO_1
(UART_WAKEUP)
Tsettle
T2
Indicates that BTH
device is ready.
T3
BT_UART_RTS_N
BT_UART_CTS_N
CLK_REQ_OUT
Tsettle
Driven
Pulled
Notes :
T1 is the time for host to settle its IOs after a reset.
T2 is the time for the BTH device to settle its IOs after a reset and ref clk settling time elapsed.
T3 is the time for the BT device to complete initialization and drive BT_UART_RTS_N low.
T4 is the setup time for BT_WAKE prior to driving BT_REG_ON high; BT_WAKEUP must be high
prior to BT_REG_ON being released. BT_WAKEUP should not be driven low until after
configuration has been completed by the host.
Tsettle is the time for the ref clk signal from the host to be guaranteed to have settled.
Figure 8: Startup Signaling Sequence
®
BROADCOM
BCM4330 Preliminary Data Sheet
April 28, 2011 • 4330-DS304-RI
Page 46
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