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CYW20715 Datasheet(PDF) 7 Page - Cypress Semiconductor |
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CYW20715 Datasheet(HTML) 7 Page - Cypress Semiconductor |
7 / 47 page Document Number: 002-14813 Rev. *B Page 7 of 47 CYW20715 1.3 Mobile Phone Usage Model The CYW20715 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. ■ 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. ■ 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. ■ 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 performance (distortion of the transmitted signal caused by mixing the cellular and Bluetooth transmissions) in the presence of a cellular trans- mission (GSM, GPRS, CDMA, WCDMA, or iDEN). Minimal external filtering is required for integration within the handset. ■ Few external components are required for integration and very compact WLBGA packaging is available. Figure 3. Mobile Phone Usage Model Voice Codec Handset Baseband TCXO LPO Clock CYW20715 802.11 WLAN PCM UART/SPI BT_WAKE HOST_WAKE CLK_REQ LPO_INPUT (optional) OPTIONAL/STATUS BT_BUSY/TX_REQ WIFI_BUSY/TX_CONFIRM XTAL_IN 1.63V to 5.5V battery |
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