MAX9867 datasheet(23/55 Pages) MAXIM

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Device Status

Status registers 0x00 and 0x01 are read-only registers

that report the status of various device functions. The

status register bits are cleared upon reading the status

Registers 0x02 and 0x03 report the DC level applied to

AUX. See the

ADC section for more details and Table 2.

Ultra-Low Power Stereo Audio Codec

______________________________________________________________________________________

ADDRESS

Status (Read Only)

CLD

SLD

ULK

JDET

0x00

Jack Sense (Read Only)

LSNS

JKSNS

JKMIC

0x01

AUX High (Read Only)

AUX[15:8]

0x02

AUX Low (Read Only)

AUX[7:0]

0x03

BITS

FUNCTION

CLD

Clip Detect Flag

Indicates that a signal has reached or exceeded full scale in the ADC or DAC.

SLD

Slew Level Detect Flag

When volume or gain changes are made, the slewing circuitry smoothly steps through all intermediate

settings. When SLD is set high, all slewing has completed and the volume or gain is at its final value. SLD

is also set when soft-start or stop is complete.

ULK

Digital PLL Unlock Flag

Indicates that the digital audio PLL has become unlocked and digital signal data is not reliable.

JDET

Headset Configuration Change Flag

JDET is set whenever there is a change in register 0x01, indicating that the headset configuration has

changed.

LSNS

LOUTP State (Valid if

SHDN = 0, JDETEN = 1)

LSNS is set when the voltage at LOUTP exceeds AVDD - 0.4V. An internal pullup from AVDD to LOUTP

causes this condition whenever there is no load on LOUTP. LSNS is only valid in differential and

capacitorless output modes.

JKSNS

JACKSNS State (Valid if JDETEN = 1)

JKSNS is set when the voltage at JACKSNS exceeds AVDD - 0.4V. An internal pullup from AVDD to

JACKSNS causes this condition whenever there is no load on JACKSNS.

JKMIC

Microphone Detection (Valid if PALEN or PAREN

≠ 00 and JDETEN = 1)

JKMIC is set when JACKSNS exceeds 0.95 x VMICBIAS.

AUX

Auxiliary Input Measurement

AUX is a 16-bit signed two’s complement number representing the voltage measured at JACKSNS/AUX.

Before reading a value from AUX, set AUXCAP to 1 to ensure a stable reading. After reading the value,

set AUXCAP to 0.

Use the following formula to convert the AUX value into an equivalent JACKSNS/AUX voltage:

K = AUX value when AUXGAIN = 1. See the ADC section for complete details.

Table 2. Status Registers

Voltage

AUX

=× ⎛

⎝⎜

⎞

⎠⎟

0 738

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