CS42L92 datasheet(74/333 Pages) CIRRUS

74 / 333 page

DS1162F2

CS42L92

4.3 Digital Core

Figure 4-27. Digital-Core Noise Generator

The noise generator can be selected as input to any of the digital mixers or signal-processing functions within the CS42L92

digital core. The hexadecimal number (0x0D) in Fig. 4-27 indicates the corresponding x_SRCn setting for selection of the

noise generator as an input to another digital-core function.

The sample rate for the noise generator is configured using NOISE_GEN_RATE. See Table 4-26. Note that sample-rate

conversion is required when routing the noise generator output to any signal chain that is asynchronous or configured for

a different sample rate.

The noise generator is enabled by setting NOISE_GEN_ENA, described in Table 4-22. The signal level is configured using

NOISE_GEN_GAIN.

4.3.11 Haptic Signal Generator

The CS42L92 incorporates a signal generator for use with haptic devices (e.g., mechanical vibration actuators). The haptic

signal generator is compatible with both eccentric rotating mass (ERM) and linear resonant actuator (LRA) haptic devices.

The haptic signal generator is highly configurable, and includes the capability to execute a programmable event profile

comprising three distinct operating phases.

The resonant frequency of the haptic signal output (for LRA devices) is selectable, providing support for many different

actuator components.

The haptic signal generator is a digital signal generator, which is incorporated within the digital core of the CS42L92. In a

typical use case the haptic signal may be routed, via one of the digital-core output mixers, to the digital PDM output. An

external amplifier can be used to drive the haptic device, as shown in Fig. 4-28.

Table 4-22. Noise Generator Control

Bit

Label

Default

Description

R160 (0x00A0)

Comfort_Noise_

Generator

NOISE_GEN_

ENA

Noise Generator Enable

0 = Disabled

1 = Enabled

4:0

NOISE_GEN_

GAIN[4:0]

0x00

Noise generator signal level

0x00 = –114 dBFS

0x01 = –108 dBFS

0x02 = –102 dBFS

…(6-dB steps)

0x11 = –6 dBFS

0x12 = 0 dBFS

All other codes are reserved

Noise Generator (0x0D)

White Noise

Generator

NOISE_GEN_ENA p. 74

NOISE_GEN_GAIN[4:0] p. 74

NOISE_GEN_RATE[4:0] p. 84

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