SA3286 Datasheet, PDF (14/16 Pages) ON Semiconductor – Pre-configured DSP System

INSPIRIA SA3286
output reduction are applied) while monitoring the
supply voltage. If the supply voltage remains above the
turn−ON threshold for at least 30 secs, the device is
allowed to exit transient reboot mode. The device
returns to shallow−reset mode and the maximum output
is restored.
Generally, any low battery shutdown or transient
shutdown that occurs while in shallow−reset mode (or while
in the shallow−reset mode component of mixed mode or
advanced reset mode) results in the Inspiria SA3286 hybrid
restarting into the memory that was last active when the shut
down occurred. The Inspiria SA3286 hybrid has this
memory restart capability for up to three memories. A restart
in any memory beyond the first three memories causes the
device to restart in the initial memory, similar to the
behaviour when a battery is first connected. The advanced
reset mode described above also applies to up to three
memories. Any additional memories would use the
shallow−reset mode behaviour, and would restart in the
initial memory after a shutdown.
In any of the above reset modes, the Inspiria SA3286
hybrid can be configured through ARKonline to reduce the
gain as the battery voltage drops. When the supply voltage
falls below the low battery threshold, low battery tones are
emitted and the wideband gain is reduced by 3 dB. As the
battery voltage continues to drop, the low battery tones
continue and the wideband gain continues to be reduced.
Once the turn−OFF threshold is reached, the device shuts
down.
Software and Security
The Inspiria SA3286 incorporates the following security
features to protect the device from cloning and against
software piracy:
• DLL protection by password − prevents a third party
from using IDS to reconfigure parts.
• Hybrid authentication by 128−bit fingerprint to identify
parts in application software − prevents a third party
from cloning a device’s EEPROM because the
fingerprint cannot be overwritten. Special functions can
be used in fitting software to reject parts that do not
match the expected fingerprint. This would prevent the
piracy of fitting software.
• DLL to hybrid pairing by using a software key in ARK
to match product libraries with client software − a part
can be ‘locked’ at manufacturing time so that it only
communicates with the library it was programmed with.
This prevents a third party from potentially upgrading a
device with a different library in IDS or other
application software.
Full software support is provided for every stage of
development from design to manufacturing to fitting. For
details, refer to the Getting Started with the ARK Software
information note.
SDA Communication
The Inspiria SA3286 is programmed via the SDA pin
using industry standard programming boxes. During
parameter changes, the main audio signal path of the hybrid
is temporarily muted using the memory switch fader to
avoid the generation of disturbing audio transients. Once the
changes are complete, the main audio path is reactivated.
Any changes made during programming are lost at
power−off unless they are explicitly burned to EEPROM
memory.
Improvements have been made to the ARK software for
the Inspiria SA3286 resulting in increased communication
speed. Certain parameters in ARKonline can be selected to
reduce the number of pages that need to be read out.
Power Management
The Inspiria SA3286 was designed to accommodate high
power applications. AC ripple on the supply can cause
instantaneous reduction of the battery’s voltage, potentially
disrupting the circuit’s function. The Inspiria SA3286
hybrids have a separate power supply and ground
connections for the output stage. This enables hearing
instrument designers to accommodate external RC filters to
minimize any AC ripple from the supply line. Reducing this
AC ripple greatly improves the stability of the circuit and
prevents unwanted reset of the circuit caused by spikes on
the supply line.
For more information on properly designing a filter to
reduce supply ripple, refer to the Using DSP Hybrids in High
Power Applications Initial Design Tips information note.
ORDERING INFORMATION
Device
SA3286−E1
Package
16 Pad Hybrid
Shipping^†
25 Units / Bubble Pack
SA3286−E1−T
16 Pad Hybrid
500 Units / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
Hybrid Jig Ordering Information
To order a Hybrid Jig Evaluation Board for Inspiria SA3286 contact your Sales Account Manager or FAE and use part
number GA3280GEVB.
www.onsemi.com
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