PRELIMINARY
CYW20710
1.3 Mobile Phone Usage Model
The CYW20710 is designed to provide a direct interface to new and existing handset designs, as shown in Figure 3. The device has
flexible PCM and UART interfaces, enabling it to transparently connect to existing circuits. In addition, the TCXO and external LPO
inputs allow the use of existing handset features, helping to minimize product size, power, and cost.
The device incorporates a number of unique features to accommodate integration into mobile phone platforms.
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The PCM interface provides multiple modes of operation to support both master and slave, as well as hybrid interfacing to one or
more external codec devices.
The UART interface supports hardware flow control with tight integration to power control sideband signaling to support the lowest
power operation.
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The TCXO interface accommodates the typical reference frequencies used by cell phones.
A programmable TCXO power-up or power-down signal (active-high or active-low) allows the device to indicate when the clock
supplied to the device can be disabled for added power saving during Sleep mode.
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The TCXO and external LPO inputs are high-impedance with minimal loading on the driving source whether power is applied to
the device or has been removed.
The highly linear design of the radio transceiver ensures that the device has the lowest output spurious emissions, regardless of
the state of operation, and has been fully characterized in the global cellular bands.
The transceiver design has excellent blocking (eliminating desensitization of the Bluetooth receiver) and intermodulation perfor-
mance (distortion of the transmitted signal caused by mixing the cellular and Bluetooth transmissions) in the presence of a cellular
transmission (GSM, GPRS, CDMA, WCDMA, or iDEN). Minimal external filtering is required for integration within the handset.
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Few external components are required for integration and very compact WLBGA packaging is available.
Figure 3. Mobile Phone Usage Model
Voice
PCM
Codec
UART/SPI
Handset
Baseband
BT_WAKE
CYW20710
1.63V to 5.5V Battery
HOST_WAKE
CLK_REQ
XTAL_IN
TCXO
BT_BUSY/TX_REQ
WIFI_BUSY/TX_CONFIRM
OPTIONAL/STATUS
802.11
WLAN
LPO_INPUT
(optional)
LPO Clock
Document No. 002-14804 Rev. *H
Page 7 of 50
CYPRESS [ CYPRESS ]
