CYW20738 Single-Chip Bluetooth Transceiver for Wireless Input Devices The Cypress CYW20738 is a Bluetooth low energy compliant, stand-alone baseband processor with an integrated 2.4 GHz trans- ceiver. It is ideal for wireless input device applications including game controllers, keyboards, remote controls, gestural input devices, and sensor devices. Built-in firmware adheres to the Bluetooth Human Interface Device (HID) profile and Bluetooth Device ID profile specifications. The CYW20738 radio has been designed to provide low power, low cost, and robust communications for applications operating in the globally available 2.4 GHz unlicensed ISM band. It is fully compliant with Bluetooth Low Energy Radio Specification. The single-chip Bluetooth transceiver is a monolithic component implemented in a standard digital CMOS process and requires minimal external components to make a fully compliant Bluetooth device. The CYW20738 is available in two package options: a 40- pin, 6 mm 6 mm QFN and a 64-pin, 7 mm 7 mm BGA. Cypress Part Numbering Scheme Cypress is converting the acquired IoT part numbers from Broadcom to the Cypress part numbering scheme. Due to this conversion, there is no change in form, fit, or function as a result of offering the device with Cypress part number marking. The table provides Cypress ordering part number that matches an existing IoT part number. Table 1. Mapping Table for Part Number between Broadcom and Cypress Broadcom Part Number Cypress Part Number BCM20738 CYW20738 BCM20738A2KML3G CYW20738A2KML3G BCM20738A1KFBG CYW20738A1KFBG Acronyms and Abbreviations In most cases, acronyms and abbreviations are defined on first use. For a comprehensive list of acronyms and other terms used in Cypress documents, go to: CYW20738 Figure 1. Functional Block Diagram Muxed on GPIO Tx RTS N 1.2V UART TXD SDA/ Rx CTS N SCL/ VDD CORE UART RXD 1.2V MOSI SCK MISO 1.2V VDD CORE WDT 28 ADC Domain VSS, Inputs BSC/SPI 1.2V VDDO, Test Periph 320K Master Processing VDDC POR Interface UART UART ROM Unit 60K 2 (BSC is I C- CT 1.2V (ARM -CM3) RAM 1.425V to 3.6V compa ble) ADC LDO MIA System Bus 1.62V to 3.6V POR 32 kHz LPCLK Peripheral I/O Ring Volt. Trans hclk Interface Control VDD IO (24 MHz to 1 MHz) Block Registers Domain RF Control I/O Ring Bus and Data Bluetooth 2.4 GHz Baseband Radio Core GPIO Keyboard 3-Axis IR Control/ Mod. Matrix Mouse SPI PMU Status and Scanner Signal 24 M/S Learning Registers MHz w/FIFO Controller Power RF I/O T/R Frequency Switch 32 kHz Synthesizer WAKE LPCLK 128 kHz LPO 6 Quadrature 40 GPIO IR 8 x 20 AutoCal Inputs (3 pair) + I/O Scan 128 kHz Matrix High Current Driver Controls LPCLK 1.2V VDD RF 28 ADC 4 PWM Inputs Domain 40 GPIO on the 64-pin BGA 24 MHz 32 kHz y (22 GPIO on the 40-pin QFN) Ref Xtal 1.62V to 3.6V VDD IO IoT Resources Cypress provides a wealth of data at