BCM43903 Preliminary Data Sheet
Table of Contents
Table of Contents
About This Document ................................................................................................................................ 10
Purpose and Audience.......................................................................................................................... 10
Acronyms and Abbreviations................................................................................................................. 10
Document Conventions......................................................................................................................... 10
Technical Support ...................................................................................................................................... 10
Section 1: Overview .......................................................................................................... 11
Introduction................................................................................................................................................. 11
Features................................................................................................................................................ 12
Standards Compliance...............................................................................................................................12
Section 2: Power Supplies and Power Management ..................................................... 14
Power Supply Topology............................................................................................................................. 14
BCM43903 Power Management Unit Features......................................................................................... 14
Power Management.................................................................................................................................... 16
PMU Sequencing ........................................................................................................................................ 18
Power-Off Shutdown.................................................................................................................................. 19
Power-Up/Power-Down/Reset Circuits..................................................................................................... 19
Section 3: Frequency References.................................................................................... 20
Crystal Interface and Clock Generation ................................................................................................... 20
External Frequency Reference.................................................................................................................. 21
Frequency Selection .................................................................................................................................. 22
External 32.768 kHz Low-Power Oscillator .............................................................................................. 23
Section 4: Applications Subsystem................................................................................. 24
Overview...................................................................................................................................................... 24
Applications CPU and Memory Subsystem............................................................................................. 24
Memory-to-Memory DMA Core.................................................................................................................. 24
Cryptography Core..................................................................................................................................... 25
Section 5: Applications Subsystem External Interfaces ............................................... 26
GPIO............................................................................................................................................................. 26
Broadcom Serial Control ........................................................................................................................... 26
JTAG and ARM Serial Wire Debug............................................................................................................ 26
PWM............................................................................................................................................................. 27
Real-Time Clock.......................................................................................................................................... 27
SPI Flash ..................................................................................................................................................... 28
UART............................................................................................................................................................ 28
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March 12, 2016 • 43903-DS102-R
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