I2C, 30-Button Remote Controller with Jack-Detect Function Allows Use of Standard Headphone Jacks
SUNNYVALE, CA-January 31, 2006-Maxim Integrated Products (NASDAQ:
MXIM) introduces the MAX11041 wired, remote-controller receiver IC
for portable media players. The MAX11041 decodes up to 31 resistor
values on an external, wired remote controller composed of low-cost
pushbutton/membrane switches and 1% resistors. In contrast to
conventional multibutton remote-control implementations, the
MAX11041's versatile architecture allows use of standard 3.5mm
headphone jacks by multiplexing the remote signal onto the audio path
through external DC-blocking capacitors. Alternatively, these devices
can utilize a single dedicated wire over the fourth connector of a
standard 4-pin stereo headphone jack. This versatility eliminates the
tooling cost and compatibility issues associated with proprietary
headphone connectors.
The MAX11041 continuously polls the keys while consuming only 8
microwatts (5 microamps at 1.6V to 3.6V). An I2C interface with
8-byte FIFO and interrupt notifies the host microcontroller of
keystroke presence and records up to four different key states.
Besides detecting keys, this device records key duration for advanced
user-interface features. It detects simultaneous keys and implements
a hold function to prevent inadvertent key presses. The MAX11041 also
features automatic key debounce and switch-chatter rejection.
The MAX11041 is available in space-saving, 4mm x 4mm, 12-pin TQFN and
2mm x 2mm UCSP™ packages that operate over the -45 degrees Celsius
to +85 degrees Celsius temperature range. Prices start at $0.96
(25k-up, FOB USA).
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