PHILIPS PCF26100 Bluetooth Adapter IC handbook

The PCF26100 is a Bluetooth adapter integrated circuit that performs various functions including power-on reset, system clock generation for baseband controller, reference clock generation for UAA3558, low-power clock generation for baseband controller, transmit clock generation for baseband controller, serial interface conversion between JTAG and 3-wire S-bus, timing control generation for UAA3558, digital-to-analog conversion of transmit data in Gaussian shape, analog-to-digital conversion of RSSI, etc.

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