MAX97236EVKIT+ Maxim Integrated Products, MAX97236EVKIT+ Datasheet - Page 34

• Manufacturer Part Number: MAX97236EVKIT+
• Description: Audio Modules & Development Tools MAX97236 Eval Kit
• Manufacturer: Maxim Integrated Products

Specifications of MAX97236EVKIT+

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Audio Amplifier with Jack Detection
The power modes of the IC are controlled by the SHDN
bit. The three power modes include detection, normal
operating, and standby.
Detection mode occurs when no jack has been plugged
in, SHDN = RESET = 0. Once a jack is plugged in and
detected, the IC enters normal operating mode after
SHDN transitions from 0 to 1. While in normal operating
mode, pull SHDN low to put the device in standby mode.
Pull RESET high then low to reset the jack detection and
configuration.
Standby mode leaves the key encoder active to pick up
a keypress event if the IC has completed jack detec-
tion prior to standby mode. A weak pullup voltage is put
across the microphone to look for a hook switch press.
Once a keypress event occurs, an interrupt flags, and
the IC enters detection mode after SHDN transitions high.
MVDD power domain:
Microphone bias, switches, ESD, and jack detection
tests 2 to 9.
V
Charge pump, digital block, ADC, mic amp, and jack
detection test 1.
The IC needs V
Turning off one supply voltage during a mode might pre-
vent proper operation of the IC.
The power-up sequence is:
• Apply V
• Apply MVDD
• Set AUTO to 01 (register 0x1E, bit 0)
There are a few different ways to power-up/-down
depending on how autonomous you want the IC to oper-
ate and whether the jack is plugged in or not. The AUTO
bits are in register 0x1E, bits 0 and 1. The three methods
for getting the IC running are:
• AUTO = 0x00: The IC detects a jack plug-in and
34
DD
set JKIN, but does not run the configuration detect
power domain:
DD
DD
Applications Information
and MVDD to operate correctly.
Power-Up/-Down Sequence
Power Domains
Power Modes
• AUTO = 0x01: The IC detects a jack plug-in and set
• AUTO = 0x02: The IC detects a jack plug-in, sets
Ensure that RESET = 0 to enable the jack detect plug-in
test signal.
Power-Up, AUTO = 0x00 or 0x01:
1) Set IDDONE and IJACKSW and IJKIN so that an
2) Wait for IRQ.
3) Wait for JACKSW to set.
4) Pull SHDN high.
5) Detection is done when DDONE sets.
If AUTO = 0x00:
1) Read the Status registers to find out what was detected.
2) System makes a decision about what to enable.
3) System sets the appropriate enable bits.
4) Set the volume register to the appropriate setting if
If AUTO = 0x01:
1) Read the Status registers to find out what was detected.
2) The appropriate enable bits automatically set.
3) Read the Enable1 and Enable2 registers to see what
4) Set the volume register to the appropriate setting if
until SHDN is pulled high. After the configuration is
detected, the IC waits for the system to turn on the
appropriate enable bits.
JKIN, but does not run the configuration detect until
SHDN is pulled high. After the configuration detect is
run, the IC automatically sets the appropriate enable
bits to be able to drive all loads for the found cable.
JKIN, and automatically runs the configuration detect.
After the configuration detect is run, the IC automati-
cally sets the appropriate enable bits to be able to
drive all loads for the found cable. However, the
amplifiers do not actually turn on until SHDN is pulled
high. The IC completes detection and waits in stand-
by mode until SHDN is pulled high.
interrupt flags when something is plugged in and the
detection is done.
audio is present.
was turned on.
audio is present.