WM8750LEFLSLASHR datasheet(17/56 Pages) WOLFSON

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WM8750L

PP Rev 1.77 May 2003

DC MEASUREMENT

For DC measurements (for example, battery voltage monitoring), the input signal at the LINPUT1

and/or RINPUT1 pins can be taken directly into the respective ADC, bypassing both PGA and

microphone boost. The ADC output then becomes unsigned relative to AVDD, instead of being a

signed (two’s complement) number relative to VREF. Setting L/RDCM will override L/RINSEL. The

input range for dc measurement is AGND to AVDD.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

7:6

LINSEL

Left Channel Input Select

00 = LINPUT1

01 = LINPUT2

10 = LINPUT3

11 = Differential

R32 (20h)

ADC Signal

Path Control

(Left)

5:4

LMICBOOST

Left Channel Microphone Gain Boost

00 = Boost off (bypassed)

01 = 13dB boost

10 = 20dB boost

11 = 29dB boost

7:6

RINSEL

Right Channel Input Select

00 = RINPUT1

01 = RINPUT2

10 = RINPUT3

11 = Differential

R33 (21h)

ADC Signal

Path Control

(Right)

5:4

RMICBOOST

Right Channel Microphone Gain Boost

00 = Boost off (bypassed)

01 = 13dB boost

10 = 20dB boost

11 = 29dB boost

Table 2 Input Software Control

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

RDCM

Right Channel DC Measurement

0 = Normal Operation, PGA Enabled

1 = Measure DC level on RINPUT1

R31 (1Fh)

ADC input Mode

LDCM

Left Channel DC Measurement

0 = Normal Operation, PGA Enabled

1 = Measure DC level on LINPUT1

Table 3 DC Measurement Select

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R31 (1Fh)

ADC Input Mode

Differential input select

0: LINPUT1 - RINPUT1

1: LINPUT2 – RINPUT2

Table 4 Differential Input Select

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