BCM43362KUBGT Datasheet, PDF (17/84 Pages) Cypress Semiconductor – Single-Chip IEEE 802.11™ b/g/n MAC/Baseband/Radio + SDIO

BCM43362 Data Sheet
Low-Power Shutdown
Low-Power Shutdown
The BCM43362 provides a low-power shutdown feature that allows the device to be turned off while the host,
and any other device in the system, remain operational. When WLAN is not needed, the WLAN core can be put
in reset by asserting WL_RST_N (logic LOW). VDDIO_RF and VDDIO remain powered while VIO and VBAT
are both present, allowing the BCM43362 to be effectively off while keeping the I/O pins powered. During a low-
power shut-down state, provided VIO continues to be supplied to the BCM43362, most outputs are tristated and
most inputs 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, enabling the BCM43362 to be a
fully integrated embedded device that takes full advantage of the lowest power-saving modes.
Two signals on the BCM43362, the system clock input (OSCIN) and sleep clock input (EXT_SLEEP_CLK), are
designed to be high-impedance inputs that do not load down the driving signal even if the BCM43362 does not
have VDDIO power applied to it. When the BCM43362 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 before it was powered down.
CBUCK Regulator Features
The CBUCK regulator has several features that help make the BCM43362 ideal for mobile devices. First, the
regulator uses 3.2 MHz as its PWM switching frequency for Buck regulation. This high frequency allows the use
of small passive components for the switcher's external circuit, thereby saving PCB space in the design. In
addition, the CBUCK regulator has three modes of operation: PWM mode for low-ripple output and for fast
transient response and extended load ranges, Burst Mode for lower currents, and Low Power Burst Mode for
higher efficiency when the load current is very low (Low Power Burst mode is not available for external devices).
The CBUCK supports external SMPS request to allow flexibility of supplying 1.8V to BCM43362, BCM2076, and
other external devices when EXT_SMPS_REQ is asserted high. It also supports low ripple PWM mode (7 mVpp
typical) for noise-sensitive applications when EXT_PWM_REQ is asserted high. A 100 µs wait/settling time from
the assertion of EXT_PWM_REQ high before increasing the load current allows the internal integrator
precharging to complete. This is not a requirement, but is preferred.
Broadcom_®
February 13, 2015 • 43362-DS106-R
IEEE 802.11 b/g/n MAC/Baseband/Radio + SDIO
Page 16
BROADCOM CONFIDENTIAL