WM8716EDS データシートの表示（PDF） - Wolfson Microelectronics plc
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WM8716EDS Datasheet PDF : 21 Pages
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WM8716
Production Data
MODES OF OPERATION
Control of the various modes of operation is either by software control over the serial interface, or
by hard-wired pin control. Selection of software or hardware mode is via MODE pin. The following
functions may be controlled either via the serial control interface or by hard wiring of the
appropriate pins.
HARDWARE CONTROL MODES
When the MODE pin is held ‘low’ the following hardware modes of operation are available. In
Hardware differential mode or 8X mode some of these modes/control words are altered or
unavailable.
DE-EMPHASIS CONTROL
MDDM1
PIN 27
L
L
H
H
Table 2 De-Emphasis Control
MCDMO
PIN 26
L
H
L
H
DE-EMPHASIS
Off
48kHz
44.1kHz
32kHz
AUDIO INPUT FORMAT
CSBIIS
PIN 28
L
L
H
H
Table 3 Audio Input Format
CSBIWO
PIN 23
L
H
L
H
DATA FORMAT
16 bit normal right justified
20 bit normal right justified
16 bit I2S
24 bit I2S
SOFT MUTE
Table 4 Soft Mute
MUTEB
PIN 25
L
Z
H
FUNCTION
Mute On (no output)
Automute
Mute Off (normal operation)
A logic low on the MUTEB pin will cause the attenuation to ramp to infinite attenuation at a rate of
128/fs seconds per 0.5dB step. Setting MUTEB high will cause the attenuation to ramp back to its
previous value.
Leaving MUTEB undriven allows operation of the automute circuit in both hardware and software
modes. On receiving 1024 consecutive zero value audio samples, the analogue stage output mute is
asserted. This may be overdriven from the MUTEB pin to disable the automute function, or output as
a weak (10kohm) output signal.
SOFTWARE CONTROL INTERFACE
The WM8716 can be controlled using a 3-wire serial interface. MD/DM0 (pin 26) is used for the
program data, MC/DM1 (pin 22) is used to clock in the program data and ML/I2S (pin 28) is use to
latch in the program data. The 3-wire interface protocol is shown in Figure 6. CSB/IWO (pin 23) must
be low when writing.
WOLFSON MICROELECTRONICS LTD
PD Rev 3.1 April 2001
10
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