MAX14579E Datasheet, PDF (1/11 Pages) Maxim Integrated Products – Low-Power Headset Detectors with SEND/END Button Support Low-Power Microphone Mode

19-5964; Rev 0; 06/11
EVAALVUAAILTAIOBNLEKIT
Low-Power Headset Detectors
with SEND/END Button Support
General Description
The MAX14579E/MAX14579AE provide a simple solution
for detecting the insertion and managing the operation
of a 3.5mm stereo headset with a microphone. These
devices integrate all circuitry required to detect SEND/
END button press events and generate required micro-
phone bias voltages.
The devices are managed with only three GPIOs from the
host controller to select between call mode and standby
mode, and monitor the SEND/END and jack insertion
status. In call mode, the low-noise LDO is enabled to
provide DC bias to the externally preamplified micro-
phone. In standby mode, microphone low-power pulsing
is enabled to reduce supply current while waiting for a
SEND/END button press event. Two open-drain outputs
signal the host controller when an insertion/removal or
SEND/END button press event occurs.
The MAX14579E/MAX14579AE manage jack insertion
detection by monitoring a 3.5mm socket with a normally
open jack insertion switch.
The devices are available in an 8-pin TDFN package,
and are fully specified over the -40NC to +85NC extended
temperature range.
Features
S 3.5mm Jack Insertion Detection
S Simple Interface: One Input/Two Open-Drain
Outputs
S Low-Power Microphone Mode
S Low-Noise, High-PSRR Microphone Bias
Generator
S Click-and-Pop Suppression
S High-ESD Protection on MIC and DETIN Inputs
±15kV Human Body Model (HBM)
Cell Phones
e-Readers
Tablet PCs
Applications
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX14579EETA+
-40NC to +85NC 8 TDFN-EP*
MAX14579AEETA+** -40NC to +85NC 8 TDFN-EP*
+Denotes a lead(Pb)-free/RoHS compliant package.
*EP = Exposed pad.
**Future product—contact factory for availablity.
Typical Operating Circuit
ADC
1µF ^3.3V
MODE
VCC
CAP
3.3V
PROCESSOR
1MΩ
MAX14579E
SWD
RES
3.3V
1MΩ
DETIN
DET
EP/GND
MIC
0.22µF
2.2kΩ
AUDIO
AMPLIFIER
MICROPHONE
AMPLIFIER
0.1µF
3.5mm
SOCKET
10kΩ
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or visit Maxim’s website at www.maxim-ic.com.