WM8904ECSSLASHR datasheet(48/188 Pages) WOLFSON

Part #	WM8904ECS/R

Description	Ultra Low Power CODEC for Portable Audio Applications

PDF	188 Pages

Scroll/Zoom	100%

Manufacturer	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

Logo

48 / 188 page

WM8904

Pre-Production

PP, Rev 3.3, September 2012

The digital microphone interface requires that MIC1 (Left Channel) transmits a data bit each time that

DMICCLK is high, and MIC2 (Right Channel) transmits when DMICCLK is low. The WM8904 samples

the digital microphone data in the middle of each DMICCLK clock phase. Each microphone must tri-

state its data output when the other microphone is transmitting.

Figure 28 Digital Microphone Interface Timing

The digital microphone interface control fields are described in Table 8.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R39 (27h)

Digital

Microphone 0

DMIC_ENA

Enables Digital Microphone mode

0 = Audio DSP input is from ADC

1 = Audio DSP input is from digital

microphone interface

When DMIC_ENA = 0, the Digital

microphone clock (DMICCLK) is held

low.

DMIC_SRC

Selects Digital Microphone Data Input

0 = IN1L/DMICDAT1

1 = IN1R/DMICDAT2

Table 8 Digital Microphone Interface Control

WM8904ECS/R Datasheet(PDF) 48 Page - Wolfson Microelectronics plc