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| BCM88335 Datasheet, PDF (39/140 Pages) Cypress Semiconductor – Single-Chip 5G Wi-Fi IEEE 802.11ac MAC/Baseband/ Radio with Integrated Bluetooth 4.1 for Automotive Applications | |||
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BCM88335 Data Sheet
Bluetooth Power Management Unit
Figure 6: Startup Signaling Sequence
LPO
VDDIO
HostResetX
Host IOs
unconfigured
Host IOs configured
T1
BT_GPIO_0
(BT_DEV_WAKE)
BT_REG_ON
T2
BTH IOs
BTH IOs configured
unconfigured
BT_GPIO_1
(BT_HOST_WAKE)
BT_UART_CTS_N
BT_UART_RTS_N
T3
Host drives
this low.
BTH device drives this
low indicating
T4
transport is ready.
CLK_REQ_OUT
T5
Driven
Pulled
Notes :
x T1 is the time for the host to settle its IOs after a reset.
x T2 is the time for the host to drive BT_REG_ON high after the host IOs are configured.
x T3 is the time for the BTH device to settle its IOs after a reset and the reference clock settling time has elapsed.
x T4 is the time for the BTH device to drive BT_UART_RTS_N low after the host drives BT_UART_CTS_N low. This assumes
the BTH device has completed initialization.
x T5 is the time for the BTH device to drive CLK_REQ_OUT high after BT_REG_ON goes high. The CLK_REQ_OUT pin is used
in designs that have an external reference clock source from the host. It is irrelevant on clock-based designs where the
BTH device generates its own reference clock from an external crystal connected to its oscillator circuit.
x The timing diagram assumes that VBAT is present.
Broadcom®
September 23, 2015 ⢠88335-DS100-R
BROADCOM CONFIDENTIAL
Page 38
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