IA611 Xplained Pro Hardware User Guide
Knowles Confidential AUD-ESP-00444-V2.0 Page 9
initialization to increase the speed of software download. For more information, see
the IA611 Xplained Pro Software User Guide for details.
There are 4 GPIO signals in addition to the two UART signals that also connect to
the IA611 through the level shifter. The GPIOs can be used for signaling from the
microphone to the MCU.
Since the IA611 only operates at 1.8V, the IA611 Xplained Pro board contains a
1.8V LDO to generate the necessary voltage for the microphones and the level
shifter.
A second digital microphone (SPK0641HT4H) is connected directly to the IA611
microphone for use in a multi-microphone configuration. This could be useful in
applications where beam forming or noise cancelation may improve performance of
the solution. The SPK0641HT4H can be disconnected from the IA611 through two
zero ohm resistors should all 4 GPIO signals be needed in the desired application.
Three sets of jumpers are installed on the board to allow the user to change the
desired interface. The default setting for the board is to use the UART. To switch to
SPI, the jumpers can be moved from the UART block to the SPI block. This block is
just to the right of the UART block. To use I2C, the jumpers can be moved to the
I2C block located directly above the UART block. Please see the software examples
for each interface to see the correct connections to the SAMD21.
