WM5102 datasheet(94/334 Pages) WOLFSON

94 / 334 page

WM5102

Production Data

PD, June 2014, Rev 4.2

PWM GENERATOR

The WM5102 incorporates two Pulse Width Modulation (PWM) signal generators as illustrated in

Figure 37. The duty cycle of each PWM signal can be modulated by an audio source, or can be set to

a fixed value using a control register setting.

A 4-input mixer is associated with each PWM generator. The 4 input sources are selectable in each

case, and independent volume control is provided for each path.

The PWM signal generators can be output directly on a GPIO pin. See “General Purpose Input /

Output” to configure a GPIO pin for this function.

Note that the PWM signal generators cannot be selected as input to the digital mixers or signal

processing functions within the WM5102 digital core.

Figure 37 Digital Core Pulse Width Modulation (PWM) Generator

The PWM1 and PWM2 mixer control registers (see Figure 37) are located at register addresses

R1600 (640h) through to R1615 (64Fh).

The full list of digital mixer control registers is provided in the “Register Map” section (Register R1600

through to R2920). Generic register definitions are provided in Table 7.

The *_SRCn registers select the input source(s) for the respective mixers. Note that the selected input

source(s) must be configured for the same sample rate as the mixer to which they are connected.

Sample rate conversion functions are available to support flexible interconnectivity - see

“Asynchronous Sample Rate Converter (ASRC)” and “Isochronous Sample Rate Converter (ISRC)”.

WM5102 Datasheet(PDF) 94 Page - Wolfson Microelectronics plc