BCM43362KUBGT Datasheet, PDF (16/84 Pages) Cypress Semiconductor – Single-Chip IEEE 802.11™ b/g/n MAC/Baseband/Radio + SDIO

BCM43362 Data Sheet
Voltage Regulators
Voltage Regulators
All BCM43362 regulator output voltages are PMU programmable and have the following nominal capabilities.
The currents listed below indicate regulator capabilities. See “System Power Consumption” on page 74 for the
actual expected loads.
• Core Buck switching regulator (CBUCK): 2.3–4.8V input, nominal 1.5V output (up to 500 mA).
• LDO3P3: 2.3–4.8V input, nominal 3.3V output (up to 40 mA)
• CLDO (for the core): 1.45–2.0V input, nominal 1.2V output (up to 150 mA)
• Low-noise LNLDO1: 1.45–2.0V input, nominal 1.2V output (up to 150 mA)
See “Internal Regulator Electrical Specifications” on page 68 for full regulator specifications.
PMU Sequencing
The WLAN PMU sequencer is responsible for minimizing system power consumption. It enables and disables
various system resources based on a computation of the required resources and a table that describes the
relationship between resources and the time needed to enable and disable them. Resource requests come from
several sources: clock requests from cores, the minimum resources defined in the ResourceMin register, and
the resources requested by any active resource request timers. The PMU sequencer maps clock requests into
a set of resources required to produce the requested clocks.
Each resource is in one of four states: enabled, disabled, transition_on, and transition_off. Each resource has
a timer that contains 0 when the resource is enabled or disabled and a nonzero value in the transition states.
The timer is loaded with the resource's time_on or time_off value when the PMU determines that the resource
must be enabled or disabled. That timer decrements on each LPO sleep clock. When it reaches 0, the state
changes from transition_off to disabled or transition_on to enabled. If the time_on value is 0, the resource can
go immediately from disabled to enabled. Similarly, a time_off value of 0 indicates that the resource can go
immediately from enabled to disabled. The terms enable sequence and disable sequence refer to either the
immediate transition or the timer load-decrement sequence.
During each clock cycle, the PMU sequencer performs the following actions:
1. Computes the required resource set based on requests and the resource dependency table.
2. Decrements all timers whose values are nonzero. If a timer reaches 0, the PMU clears the ResourcePending
bit for the resource and inverts the ResourceState bit.
3. Compares the request with the current resource status and determines which resources must be enabled or
disabled.
4. Initiates a disable sequence for each resource that is enabled, no longer being requested, and has no
powered-up dependents.
5. Initiates an enable sequence for each resource that is disabled, is being requested, and has all of its
dependencies enabled.
Broadcom_®
February 13, 2015 • 43362-DS106-R
IEEE 802.11 b/g/n MAC/Baseband/Radio + SDIO
Page 15
BROADCOM CONFIDENTIAL