max98089 Maxim Integrated Products, Inc., max98089 Datasheet - Page 116
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max98089
Manufacturer Part Number
max98089
Description
Low-power, Stereo Audio Codec With Flexsound Technology
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX98089.pdf
(131 pages)
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Table 34. Jack Detection Registers (continued)
The IC measures the voltage applied to SPKLVDD (typically the battery voltage) and reports the value in register 0x03.
This value is also used by the speaker limiter circuitry to set accurate thresholds. When the battery measurement func-
tion is disabled, the battery voltage is user programmable.
Table 35. Battery Measurement Registers
REGISTER
REGISTER
0x4E
0x03
0x51
BIT
BIT
4
3
2
1
0
7
6
3
2
1
0
7
6
5
4
0
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PERFMODE
HPPLYBCK
PWRSV8K
SPREGEN
VBATEN
VCMEN
BIASEN
PWRSV
NAME
NAME
SHDN
BGEN
JDWK
VBAT
See the Power Management section.
See the Power Management section.
See the Power Management section.
See the Power Management section.
JACKSNS Pullup
When JDWK = 1, JACKSNS is slow to increase in voltage. Set JDWK = 0 before setting
JDETEN = 1 to prevent false detection.
Valid when MBIAS = 0.
0 = 2.4kI to SPKLVDD (allows microphone detection)
1 = 5FA to SPKLVDD (minimizes supply current)
Battery Voltage
Read VBAT when V
0 to allow proper speaker amplifier signal processing. Calculate/program the battery
voltage using the following formula:
V
See the Power Management section.
Battery Measurement Enable. Enables an internal ADC to measure V
0 = Disabled (register 0x03 readable and writeable)
1 = Enabled (register 0x03 read only)
See the Power Management section.
See the Power Management section.
See the Power Management section.
See the Power Management section.
BATTERY
Low-Power, Stereo Audio Codec
= 2.55V + [VBAT/10]
with FlexSound Technology
BATEN
= 1 to determine V
DESCRIPTION
DESCRIPTION
SPKLVDD
. Program VBAT when V
Battery Measurement
MAX98089
SPKLVDD
BATEN
.
=
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