19-5964; Rev 0; 06/11
TION KIT
EVALUA BLE
AVAILA
Low-Power Headset Detectors
with SEND/END Button Support
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)
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.
MAX14579E/MAX14579AE
Applications
Cell Phones
e-Readers
Tablet PCs
Ordering Information
PART
MAX14579EETA+
MAX14579AEETA+**
TEMP RANGE
-40NC to +85NC
-40NC to +85NC
PIN-PACKAGE
8 TDFN-EP*
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
3.5mm
SOCKET
MODE
V
CC
CAP
0.22µF
3.3V
PROCESSOR
1MΩ
SWD
3.3V
MAX14579E
RES
2.2kΩ
DETIN
DET
EP/GND
MIC
10kΩ
1MΩ
AUDIO
AMPLIFIER
MICROPHONE
AMPLIFIER
0.1µF
_______________________________________________________________
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.
Low-Power Headset Detectors
with SEND/END Button Support
MAX14579E/MAX14579AE
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to ground.)
V
CC
, MODE, SWD, DET ..........................................-0.3V to +6V
CAP, MIC, DETIN, RES ............................ -0.3V to (V
CC
+ 0.3V)
Continuous Current into Any Terminal ..........................
Q100mA
Continuous Power Dissipation (T
A
= +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 (B
JA
) ........83.9NC/W
Junction-to-Case Thermal Resistance (B
JC
)................37NC/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to
www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(V
CC
= 2.5V to 5.5V, C
DETIN
< 100pF, T
A
= -40NC to +85NC, unless otherwise noted. Typical values are at V
CC
= 3.6V, T
A
= +25NC.)
(Note 2)
PARAMETER
DC CHARACTERISTICS
Supply Voltage Range
V
CC
Undervoltage-Lockout
Threshold
V
CC
V
CCUVLO
V
CC
rising
MODE = low, DETIN = high
V
CC
Supply Current
I
CC
V
CC
= 2.8V
MODE = low, DETIN = low,
I
MIC
= 300FA
MODE = high, DETIN = low,
I
MIC
= 300FA
DETIN Pullup Resistance
Internal Microphone Bias Voltage
MIC SEND/END Detection
Threshold
DETIN Detection Threshold
Falling edge
R
DETIN
V
BIAS
MODE = low
MODE = high, DETIN = low
0.20
O
V
BIAS
1/3
O
V
CC
2.5
0.9
1.7
0.8
8
500
1000
V
CC
2.2
0.22
O
V
BIAS
1/2
O
V
CC
0.24
O
V
BIAS
2/3
O
V
CC
5.5
2.45
1.3
11
800
kI
V
V
V
FA
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
______________________________________________________________________________________
Low-Power Headset Detectors
with SEND/END Button Support
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.5V to 5.5V, C
DETIN
< 100pF, T
A
= -40NC to +85NC, unless otherwise noted. Typical values are at V
CC
= 3.6V, T
A
= +25NC.)
(Note 2)
PARAMETER
LINEAR REGULATOR (CAP)
Minimum Bypass Capacitance
Output Current Limit
Output Voltage
LDO PSRR
C
OUT
I
CAP
V
LDO
PSRR
LDO
V
CAP
< V
LDO
V
CC
= 2.8V
Noise from V
CC
to CAP, f = 217Hz,
V
CC
= 2.8V
Q0.1V,
I
CAP
= 300FA,
MODE = high
V
CC
= 2.8V, I
MIC
= 300FA, f = 100Hz to
4000Hz
V
CC
= 2.8V, R
L
= 2kI, V
CAP
from 90% to
10%
1.4
0.4
-1
Output voltage = 5V
I
SINK
= 1mA
R
MIC
= 5kI, MPLP
R
MIC
= 5kI, MPLP
Falling edge
MAX14579E
MAX14579AE
120
8
300
1000
28
Human Body Model
Human Body Model
Q15
Q2
+1
1
0.4
0.22
4
2.0
2.2
100
2.45
FF
mA
V
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX14579E/MAX14579AE
LDO Noise
LDO Turn-Off Time
N
LDO
t
OFF
11
120
FV
RMS
Fs
DIGITAL SIGNALS (MODE, SWD, DET)
Input-Voltage High
Input-Voltage Low
Input Leakage Current
Output Logic-High Leakage
Current (Open Drain)
Output Logic-Low
DYNAMIC CHARACTERISTICS
MIC Low-Power Mode On-Time
MIC Low-Power Mode Period
DETIN Debounce Time
SEND/END Debounce Time
ESD PROTECTION
MIC, DETIN
All Other Pins
kV
kV
t
MICLPO
t
MICLPP
t
DETINDEB
t
SEDEB
Fs
ms
ms
ms
V
IH
V
IL
I
INLEAK
I
OH_LKG
V
OL
V
V
FA
FA
V
Note 2:
All units are production tested at T
A
= +25NC. Specifications over temperature are guaranteed by design.
_______________________________________________________________________________________
3
Low-Power Headset Detectors
with SEND/END Button Support
MAX14579E/MAX14579AE
Typical Operating Characteristics
(MAX14579E, V
CC
= 3.3V, T
A
= +25NC, C
DETIN
< 100pF, unless otherwise noted.)
V
CC
SUPPLY CURRENT vs. VOLTAGE
MAX14579E toc01
V
CC
SUPPLY CURRENT vs. VOLTAGE
MPLP MODE
I
MIC
= 0µA
T
A
= +85°C
T
A
= +25°C
6
4
2
0
MAX14579E toc02
4.5
4.0
3.5
3.0
I
CC
(µA)
2.5
2.0
1.5
1.0
0.5
0
SHUTDOWN MODE
12
10
8
T
A
= -40°C
I
CC
(µA)
T
A
= +25°C
T
A
= +85°C
2.5
3.5
V
CC
(V)
4.5
5.5
T
A
= -40°C
2.5
3.5
V
CC
(V)
4.5
5.5
V
CC
SUPPLY CURRENT vs. VOLTAGE
MAX14579E toc03
CAP VOLTAGE vs. V
CC
I
CAP
= 0mA
MAX14579E toc04
200
180
160
CALL MODE
I
MIC
= 0µA
T
A
= +85°C
3.0
2.5
2.0
V
CAP
(V)
1.5
1.0
0.5
0
I
CC
(µA)
140
120
100
80
60
2.5
3.5
V
CC
(V)
4.5
5.5
T
A
= +25°C
T
A
= -40°C
2.5
3.5
V
CC
(V)
4.5
5.5
CAP VOLTAGE vs. CURRENT
MAX14579E toc05
CAP VOLTAGE vs. TEMPERATURE
V
CC
= 2.8V
I
CAP
= 0mA
MAX14579E toc06
3.0
2.5
2.0
V
CAP
(V)
1.5
1.0
0.5
0
0
V
CC
= 3.3V
3.0
2.5
2.0
V
CAP
(V)
1.5
1.0
0.5
0
1
2
3
4
5
6
7
-40
-15
10
T
A
(°C)
35
60
85
I
CAP
(mA)
4
______________________________________________________________________________________
Low-Power Headset Detectors
with SEND/END Button Support
Typical Operating Characteristics (continued)
(MAX14579E, V
CC
= 3.3V, T
A
= +25NC, C
DETIN
< 100pF, unless otherwise noted.)
CAP POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
V
CC
= 2.8V ± 0.1V
MAX14579E toc08
MAX14579E/MAX14579AE
CAP DROPOUT VOLTAGE vs. CAP CURRENT
T
A
= -40°C
DROPOUT VOLTAGE (mV)
2000
MAX14579E toc07
2500
0
-20
PSRR TO CAP (dB)
-40
-60
-80
-100
-120
T
A
= +25°C
1500
T
A
= +85°C
1000
500
0
0
1
2
3
4
5
6
7
I
CAP
(mA)
10
100
1000
FREQUENCY (Hz)
10,000
100,000
CAP NOISE DENSITY vs. FREQUENCY
NOISE SPECTRAL DENSITY (µV/√Hz)
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
100
1000
FREQUENCY (Hz)
10,000
MAX14579E toc09
MICROPHONE LOW-POWER MODE OPERATION
MAX14579E toc10
1.0
3.3V
V
MIC
1V/div
0V
1ms/div
DETIN DEBOUNCE TIMING (MODE = LOW)
MAX14579E toc11
SWD DEBOUNCE TIMING
3.3V
V
DETIN
1V/div
0V
3.3V
V
RES
2V/div
0V
MAX14579E toc12
3.3V
V
MIC
1V/div
0V
3.3V
V
SWD
2V/div
0V
40ms/div
100ms/div
_______________________________________________________________________________________
5
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