BCM20713A1KUBXGT Datasheet, PDF (21/65 Pages) Cypress Semiconductor – Single-Chip Bluetooth Transceiver and Baseband Processor

BCM20713 Preliminary Data Sheet
Power Management Unit
Bluetooth Baseband Core Power Management
The device provides the following low-power operations for the Bluetooth Baseband Core (BBC):
• Physical layer packet handling turns RF on and off dynamically within packet TX and RX.
• Bluetooth specified low-power connection modes—Sniff, Hold, and Park. While in these low-power
connection modes, the device runs on the Low Power Oscillator and wakes up after a predefined time
period.
Backdrive Protection
The BCM20713 provides a backdrive protection feature that allows the device to be turned off while the host
and other devices in the system remain operational. When the device is not needed in the system, VDD_RF and
VDDC are shut down and VDDO remains powered. This allows the device to be effectively off, while keeping
the I/O pins powered so that they do not draw extra current from other devices connected to the I/O.
Note: VDD_RF collectively refers to the VDDTF, VDDIF, VDDLNA, VDDPX, and VDDRF RF power
supplies.
Note: Never apply voltage to I/O pins if VDDO is not applied.
During the low power shutdown state and as long as VDDO remains applied to the device, all outputs are
tristated and all digital and analog clocks are disabled. Input voltages must remain within the limits defined for
normal operation. This is done to either prevent current draw and back loading on digital signals in the system.
It also enables the device to be fully integrated in an embedded device and take full advantage of the lowest
power savings modes. If VDDC is powered up externally (not connected to VREG), VDDC requires 750K ohms
to ground during low-power shutdown. If VDDC is powered up by VREG, VDDC does not require 750K ohms to
ground because the internal main LDO has about 750 K ohms to ground when turned off.
Several signals, including the frequency reference input (XTAL_IN) and external LPO input (LPO_IN), are
designed to be high-impedance inputs that will not load down the driving signal, even if VDDO power is not
applied to the chip. The other signals with back drive prevention are RST_N, COEX_OUT0, COEX_OUT1,
COEX_IN, PCM_SYNC, PCM_CLK, PCM_OUT, PCM_IN, UART_RTS_N, UART_CTS_N, UART_RXD,
UART_TXD, GPIO_0, GPIO_1, GPIO_2, GPIO_4, GPIO_7, CFG_SEL, and OTP_DIS.
All other IO signals must remain at VSS until VDDO is applied. Failing to do this can result in unreliable startup
behavior.
When powered on, using REG_EN is the same as applying power to the BCM20713. The device does not have
information about its state before being powered-down.
Broadcom^®
December 21, 2015 • 20713-DS102-R
Single-Chip Bluetooth Transceiver and Baseband Processor
Page 20
BROADCOM CONFIDENTIAL