ADVANCE
CYW43570
5.4 Test Mode Support
The CYW43570 fully supports Bluetooth Test mode as described in Part I:1 of the Specification of the Bluetooth System Version 3.0.
This includes the transmitter tests, normal and delayed loopback tests, and reduced hopping sequence.
In addition to the standard Bluetooth Test Mode, the CYW43570 also supports enhanced testing features to simplify RF debugging
and qualification and type-approval testing. These features include:
■ Fixed frequency carrier wave (unmodulated) transmission
❐ Simplifies some type-approval measurements (Japan)
❐ Aids in transmitter performance analysis
■ Fixed frequency constant receiver mode
❐ Receiver output directed to I/O pin
❐ Allows for direct BER measurements using standard RF test equipment
❐ Facilitates spurious emissions testing for receive mode
■ Fixed frequency constant transmission
❐ Eight-bit fixed pattern or PRBS-9
❐ Enables modulated signal measurements with standard RF test equipment
5.5 Bluetooth Power Management Unit
The Bluetooth power management unit (PMU) provides power management features that can be invoked by either software through
power management registers or packet handling in the baseband core. The power management functions provided by the CYW43570
are:
■ RF Power Management
■ Host Controller Power Management
■ BBC Power Management
5.5.1 RF Power Management
The BBC generates power-down control signals for the transmit path, receive path, PLL, and power amplifier to the 2.4 GHz trans-
ceiver. The transceiver then processes the power-down functions accordingly.
5.5.2 Host Controller Power Management
When running in UART mode, the CYW43570 can be configured so that dedicated signals are used for power management hand-
shaking between it and the host. The basic power-saving functions supported by those hand-shaking signals include the standard
Bluetooth defined power savings modes and standby modes of operation.
Table 5 describes the power-control hand-shake signals used with the UART interface.
Table 5. Power Control Pin Description
Signal
Mapped to Pin
J1
Type
Description
BT_DEV_WAKE
I
Bluetooth device wake-up: Signal from the host to the CYW43570 indicating
that the host requires attention.
■ Asserted: The Bluetooth device must wake-up or remain awake.
■ Deasserted: The Bluetooth device may sleep when sleep criteria are met.
The polarity of this signal is software configurable and can be asserted high
or low.
BT_HOST_WAKE
BT_CLK_REQ
J2
J5
O
Host wake up. Signal from the CYW43570 to the host indicating that the
CYW43570 requires attention.
■ Asserted: host device must wake-up or remain awake.
■ Deasserted: host device may sleep when sleep criteria are met.
The polarity of this signal is software configurable and can be asserted high
or low.
This is an active-low signal that require external pull-up resistor 10k for
operation.
O
The CYW43570 asserts BT_CLK_REQ when Bluetooth or WLAN wants the
host to turn on the reference clock. The BT_CLK_REQ polarity is active-high.
Add an external 100 kΩ pull-down resistor to ensure the signal is deasserted
when the CYW43570 powers up or resets when VDDIO is present.
Note: Pad function Control Register is set to 0 for these pins (see Section 13. DC Characteristics).
Document Number: 002-15054 Rev. *I
Page 19 of 94
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