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Bluetooth Power Management Unit

BCM4354 Data Sheet

BROADCOM CONFIDENTIAL

Broadcom®

October 15, 2014 • 4354-DS109-R

Page 38

The timing for the startup sequence is defined in Figure 6.

Figure 6: Startup Signaling Sequence

HostResetX

VDDIO

LPO

BT_GPIO_0

(BT_DEV_WAKE

)

BT_UART_CTS_N

CLK_REQ_OUT

BT_GPIO_1

(BT_HOST_WAKE)

BT_REG_ON

BT_UART_RTS_N

Host I/Os

configured

Host I/Os

unconfigured

BTH I/Os

configured

BTH I/Os

unconfigured

Notes:

 T1 is the time for Host to settle it’s IOs after a reset.

 T2 is the time for Host to drive BT_REG_ON high after the Host IOs are configured.

 T3 is the time for BTH (Bluetooth) device to settle its IOs after a reset and reference clock settling time has elapsed.

 T4 is the time for BTH device to drive BT_UART_RTS_N low after the Host drives BT_UART_CTS_N low. This assumes the BTH device has already

completed initialization.

 T5 is the time for BTH device to drive CLK_REQ_OUT high after BT_REG_ON goes high. Note this pin is used for designs that use an external reference

clock source from the Host. This pin is irrelevant for Crystal reference clock based designs where the BTH device generates it’s own reference clock from

an external crystal connected to it’s oscillator circuit.

 Timing diagram assumes VBAT is present.

Driven

Pulled

BTH device drives this line low

indicating transport is ready

Host side drives

this line low

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