Document
MAX14579E/MAX14579AE
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 microphone 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 microphone. 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
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX14579E/MAX14579AE
Low-Power Headset Detectors with SEND/END Button Support
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to ground.) VCC, MODE, SWD, DET...........................................-0.3V to +6V CAP, MIC, DETIN, RES............................. -0.3V to (VCC + 0.3V) Continuous Current into Any Terminal........................... Q100mA Continuous Power Dissipation (TA = +70NC)
TDFN (derate 11.9mW/NC above +70NC)..................953.5mW
Operating Temperature Range........................... -40NC to +85NC Junction Temperature......................................................+150NC Storage Temperature Range............................ -65NC to +150NC Lead Temperature (soldering, 10s) ................................+300NC Soldering Temperature (reflow).......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TDFN Junction-to-Ambient Thermal Resistance (BJA)........83.9NC/W Junction-to-Case Thermal Resistance (BJC)................37NC/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(VCC = 2.5V to 5.5V, CDETIN < 100pF, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 3.6V, TA = +25NC.) (Note 2)
PARAMETER DC CHARACTERISTICS Supply Voltage Range VCC Undervoltage-Lockout Threshold
VCC Supply Current
DETIN Pullup Resistance Internal Microphone Bias Voltage MIC SEND/END Detection Threshold
SYMBOL VCC
VCCUVLO
ICC
RDETIN VBIAS
CONDITIONS
VCC rising
VCC = 2.8V
MODE = low, DETIN = high
MODE = low, DETIN = low, IMIC = 300FA
MODE = high, DETIN = low, IMIC = 300FA
MODE = low MODE = high, DETIN = low
DETIN Detection Threshold
Falling edge
MIN 2.5 0.9
0.20 O VBIAS 1/3 O VCC
TYP
1.7 0.8 8
500 1000 VCC 2.2 0.22 O VBIAS 1/2 O VCC
MAX 5.5 2.45 1.3 11 800
0.24 O VBIAS 2/3 O VCC
UNITS V V
FA
kI V V V
2 _______________________________________________________________________________________
MAX14579E/MAX14579AE
Low-Power Headset Detectors with SEND/END Button Support
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.5V to 5.5V, CDETIN < 100pF, TA = -40NC to +85NC, unless otherwise noted. Typical values are a.