GA3227 Datasheet, PDF (10/13 Pages) ON Semiconductor – Pre-configured DSP System

CONSOLIDATOR GA3227
Static Switch on MS, Static Switch on MS2 (Jump to
Memory C)
This mode uses two static switches to change memories.
Unlike in the previous example, this mode switches to the
last valid memory when the static switch on MS2 is HIGH.
This means that this mode can only use a maximum of three
memories (even if four valid memories are programmed).
Table 6 describes which memory is selected depending on
the state of the switches.
Table 6. STATIC SWITCH ON MS, STATIC SWITCH
ON MS2 (Jump to Memory C)
MS
MS2
Memory
OPEN OPEN
A
HIGH OPEN
B (if valid, otherwise A)
OPEN HIGH
C
HIGH
HIGH
C
In this mode, it is possible to jump from any memory to
any other memory simply by changing the state of both
switches. If both switches are changed simultaneously, then
the transition is smooth. Otherwise, if one switch is changed
and then the other, the part will transition to an intermediate
memory before reaching the final memory.
When MS2 is set HIGH, the state of the switch on MS is
ignored. This prevents memory select beeps from occurring
when switching MS when MS2 is HIGH.
The part starts in whatever memory the switches are
selecting. If the device starts up in a memory other than A,
and the memory beep tones are enabled, the device emits the
corresponding tones for that memory. If a memory is invalid,
the part defaults to memory A.
Audible Memory Change Indicator
The Consolidator GA3227 Digital can be configured to
produce tones to indicate a memory change.
Through ARKonline, the Consolidator GA3227 can be
configured to either enable or disable the Memory Change
Indicator. When the Memory Change Indicator is enabled,
there is an option to have a single beep for each memory
change or multiple−beeps.
The amplitude and frequency of the memory change tone
can be selected independently from the Tone Generator
settings and can be individually selected for each memory.
When the memory change multiple−beep is enabled, and
the memory change tone is enabled, then during a memory
change operation the selected tone beeps a code to indicate
which memory was selected. The beep sequence is 150 ms
ON, followed by 150 ms OFF, between the beeps. The
memory change beeping code is deciphered in Table 7.
Table 7. MEMORY CHANGE BEEPING CODE
Selected Memory
# Beeps
A
1
B
2
C
3
Tone Generator
The tone generator is capable of producing programmable
tones. When the Tone Generator is enabled, the
Consolidator GA3227 Digital connects the output of the
tone generator to the input of the D/A converter. The
programmed tone is output until the Tone Generator is
disabled. When disabled, the normal audio signal path is
connected again. The tone generator produces a beep to
indicate a memory select change, a microphone/telecoil
selection change, or to warn the user of low battery voltage.
Low Battery Indicator (Power−On / Power−Off)
During power−on, the Consolidator GA3227 Digital is
held in a reset state until V_b reaches a turn−ON threshold,
and the hybrid’s internal control logic determines that the
supply is stable. When this occurs, the hybrid begins its
power−on sequence.
When a low battery condition is detected, the
Consolidator GA3227 Digital sends out a series of three
beeps (225 ms ON, 225 ms OFF, 225 ms ON, 225 ms OFF,
225 ms ON) to indicate the battery is low. This is repeated
every five minutes until the device reaches the turn−OFF
threshold.
If V_b drops below the turn−OFF threshold, then the
Consolidator GA3227 Digital is returned to its reset state
and the audio output is muted.
There are four reset modes which are selectable through
ARKonline.
The first is the shallow−reset mode which, during the
power−on sequence, circuit starts when the supply voltage
rises above the turn−ON threshold after shutdown. The
device functions until the supply voltage drops below the
turn−OFF threshold, but recovers when the device rises
above the turn−ON threshold again.
The second is deep−reset mode which begins when the
supply voltage rises above the turn−ON threshold after
shutdown. Once the supply voltage drops below the
turn−OFF threshold the Consolidator GA3227 shuts down
and remains there until the supply voltage drops below
approximately 0.3 V and subsequently rises above the
turn−ON threshold after shutdown.
The third is a combination of these two modes, where the
device starts up in shallow−reset mode initially, then
changes over to deep−reset mode after 5 minutes.
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