PRELIMINARY ISD1700 SERIES
Publication Release Date: Nov 6, 2008
- 12 -
Revision 1.31
FUNCTIONS
[3]
PIN
PDIP /
TSOP
NAME
SOIC
V
CCA
21 14
Analog Power Supply
. It is important to have a separate path for each
power signal including V
CCD
, V
CCA
and V
CCP
to minimize the noise
coupling. Decoupling capacitors to V
SSA
should be as close to the device
as possible.
FT
22 15
Feed-through:
In Standalone mode, when FT is engaged low, the AnaIn
feed-through path is activated. As a result, the AnaIn signal is transmitted
directly from AnaIn to both Speaker and AUD/AUX outputs with Volume
Control. However, SPI overrides this input, while in SPI mode, and feed-
through path is controlled by a D6 of APC register. This pin has an
internal pull-up device
[1]
and an internal debounce (T
Deb
)
[2]
for start and
end allowing the use of a push button switch.
PLAY
23 16
Playback:
Pulsing
PLAY
to Low once initiates a playback operation.
Playback stops automatically when it reaches the end of the message.
Pulsing it to Low again during playback stops the operation.
Holding
PLAY
Low constantly functions as a sequential playback
operation loop. This looping continues until
PLAY
returns to High. This
pin has an internal pull-up device
[1]
and an internal debounce (T
Deb
)
[2]
for
start and end allowing the use of a push button switch.
REC
24 17
Record:
The device starts recording whenever
REC
switches from High
to Low and stays at Low. Recording stops when the signal returns to
High. This pin has an internal pull-up device
[1]
and an internal debounce
(T
Deb
)
[2]
for start allowing the use of a push button switch.
ERASE
25 18
Erase:
When active, it starts an erase operation. Erase operation will take
place only when the playback pointer is positioned at either the first or last
message. Pulsing this pin to Low enables erase operation and deletes the
current message. Holding this pin Low for more than 3 sec. initiates a
global erase operation, and will delete all the messages. This pin has an
internal pull-up device
[1]
and an internal debounce (T
Deb
)
[2]
for start and
end allowing the use of a push button switch.
FWD
26 19
Forward:
When triggered, it advances to the next message from the
current location, when the device is in power down status. During
playback cycle, pulsing this pin Low stops the current playback operation
and advances to the next message, and then re-starts the playback
operation of the new message. This pin has an internal pull-up device
[1]
and an internal debounce (T
Deb
)
[2]
for start and end allowing the use of a
push button switch.
INT
RDY
27 20
An open drain output.
Ready (Standalone mode):
This pin stays Low during record, play, erase and forward operations and
stays High in power down state
Interrupt (SPI mode):
After completing the SPI command, an active low interrupt is generated.
Once the interrupt is cleared, it returns to High.
