isd1740a Winbond Electronics Corp America, isd1740a Datasheet - Page 18

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

7.3.2
x
x
x
7.3.3
x
x
x
7.3.4
x
7.3.5
The duration of sound effects is determined by the sampling frequency selected. All sound
effects with the same sampling frequency have the same duration.
Table 8.1 Sound Effect Duration vs. Sampling Frequency
Sampling Frequency
Duration of SE
First press and hold
SE1 and cause the LED to blink once (if at the last message location, the chip will play
SE2 and the LED will blink twice).
While holding
device is now in SE editing mode.
The LED flashing once indicates that SE1 is accessible.
When in SE editing mode, one can perform record, play, or erase operation on each SE
by pressing the appropriate button. For example, to record SE, simply press and hold
respectively.
A
The LED will blink 1~4 times after such operations to indicate which SE is active. If
is pressed while accessing SE4, the LED will flash once to indicate that SE1 is again
active.
While the LED is blinking, the device will ignore any input commands. The User must
wait until the LED stops blinking before any record, play or erase command can be sent.
First press and hold
hold the
has now exited from SE editing mode.
REC
FWD
Entering SE Mode
SE Editing
Exiting SE Mode
Sound Effect Duration
. Similarly for play and erase functions, press and hold
operation moves the record and playback pointers to the next SE sequentially.
REC
FWD
Low until the LED blinks twice and SE2 (if present) is played. The device
Low, press and hold the
FWD
FWD
0.33 sec
12 kHz
until the LED stops blinking. Then, simultaneously press and
Low for more than 3 seconds. This action on
0.5 sec
- 18 -
8 kHz
0.625 sec
6.4 kHz
REC
Low until the LED blinks once. The
ISD1700A SERIES
0.75 sec
5.3 kHz
PLAY
4 kHz
1 sec
FWD
or
ERASE
will play
FWD
,