BCM4356XKWBGT Datasheet, PDF (26/195 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
Wireless Charging
Wireless Charging
The BCM4356 combo IC is designed for paired operation with the BCM59350 wireless power transfer front-end
chip. Working together, the two chips form a power receiver unit (PRU) that is compliant with the Alliance for
Wireless Power specification (A4WP). High-level functional block diagram for wireless charging is provided in
Figure 4. The power transmit unit (PTU) resides in the charging pad while the power receive unit is integrated
into the mobile device. The charging process begins as the mobile device is placed onto the charging pad. The
power is transferred from PTU to PRU through the TX and RX coils by means of magnetic induction. The
Bluetooth control link handles communications, i.e., handshaking, between them. PTU is a BLE client, which
gets performance data from the BLE server (PRU) in order to adapt its power to the mobile's need.
Figure 4: High-Level Functional Block Diagram for Wireless Charging
Power Transmit Unit (PTU)
USB
WPT
Transmit
WPT
Tx Coil
Resonator
Wireless Power
Transfer
WPT
Rx Coil
Resonator
Power Receiver Unit (PRU)
VBUS Detect
BCM59350
WPT
Front End
VBUCK
GPIO
Power
Switch
Charger
PMU
BT Antenna
BLE
Bluetooth Control
Link
WPT Control WPT 1.8/3.3
BT Antenna BCM4356
System power
Bluetooth System control i/f
Low-Energy (BLE)
Application
Processor
Battery
Further details on the PRU are depicted in Figure 5 on page 26. It shows both ICs along with a power switch,
charger, power management IC, and the application processor (system).
Broadcom^®
May 8, 2015 • 4356-DS103-R
BROADCOM CONFIDENTIAL
Page 25