isd1740a Winbond Electronics Corp America, isd1740a Datasheet - Page 17

• Manufacturer Part Number: isd1740a
• Description: Multi-message Single-chip Voice Record&playback Devices
• Manufacturer: Winbond Electronics Corp America

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7.2
If this optional feature is enabled, after a recording operation, the LED output will blink once every
few seconds to indicate the presence of a new message. After a subsequent playback operation,
the vAlert will stop flashing.
7.3 S
SE editing can be accessed via push buttons. The first sixteen addresses are shared equally by
four Sound Effects (SE1, SE2, SE3, and SE4).
specifications.
7.1.6
Pulsing
until the minimum setting is reached. Subsequent pulses will increase the volume until the
maximum level is reached and the cycle will start again. There are 8 steps of volume control.
Each step changes the volume by 4 dB. The
level.
7.1.7
The
held Low, FT mode is enabled. By factory default, FT mode will pass AnaIn to SPK and AUD
outputs if the device is idle. It will record AnaIn to the memory during a record operation.
V
7.3.1
The functions of SEs are as follows:
Whether or not the SEs are programmed, the LED will flash accordingly. The LED flashes
once for SE1, twice for SE2, and so on. The frequency of flashing depends upon the
sampling frequency selected and the power supply level used.
RESET
RESET
o
o
o
o
A
OUND
LERT
SE1: Beginning of recording, forward or global erase warning
SE2: End of recording, single erase or forward from last message
SE3: Invalid operation
SE4: Global erase
FT
E
operation will re-initialize the volume level to the default state, which is the maximum
must stay active for at least 1 Psec after all supply rails reach their proper
F
VOL Operation
Sound Effects
FFECT
VOL
FT (Feed-Through) Operation
EATURE
controls the feed-through path from the input to the output of the chip. When
Low changes the volume output. Each pulse on
(SE) E
(O
PTIONAL
DITING
)
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Publication Release Date: March 28, 2005
VOL
ISD1700A SERIES
VOL
is debounced internally. A
will decrease the volume
Revision A0
FT
is