BCM4356XKUBGT Datasheet, PDF (186/195 Pages) Cypress Semiconductor – Single-Chip 5G WiFi IEEE 802.11ac 2×2 MAC/ Baseband/Radio with Integrated Bluetooth 4.1, FM Receiver, and Wireless Charging

BCM4356 Advance Data Sheet
Sequencing of Reset and Regulator Control Signals
Power-up Sequences
Figure 51 shows the WLAN boot-up sequence from power-up to firmware download.
Figure 51: WLAN Boot-Up Sequence
VBAT*
VDDIO
WL_REG_ON
VDDC
(from internal PMU)
Internal POR
< 950 µs
< 104 ms
< 4 ms
After a fixed delay following Internal POR and WL_REG_ON going high,
the device responds to host F0 (address 0x14) reads.
Device requests for reference clock
Host Interaction:
Host polls F0 (address 0x14) until it reads a
predefined pattern.
8 ms
After 8 ms the reference clock is
assumed to be up. Access to PLL
registers is possible.
Host sets wake-up-wlan bit and
waits 8 ms, the maximum time for
reference clock availability.
After 8 ms, host programs PLL
registers to set crystal frequency
Chip active interrupt is asserted after the PLL locks
Host downloads
code.
*Notes:
1. VBAT should not rise 10%–90% faster than 40 microseconds.
2. VBAT should be up before or at the same time as VDDIO . VDDIO should NOT be present first or be held high before VBAT is high .
Broadcom^®
May 8, 2015 • 4356-DS103-R
BROADCOM CONFIDENTIAL
Page 185