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PDF ISD18A04 Data sheet ( Hoja de datos )
| Número de pieza | ISD18A04 | |
| Descripción | VOICE RECORD/PLAYBACK DEVICE | |
| Fabricantes | nuvoton | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ISD18A04 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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ISD18A04
18
SINGLE-CHIP, SINGLE-MESSAGE
19
VOICE RECORD/PLAYBACK DEVICE
20
4- TO 8-SECONDS DURATION
21
Publication Release Date: Feb 12, 2009
- 1 - Revision A03
1 page  
ISD18A04
4. PAD DESCRIPTION
3
PAD NAME I/O
FUNCTION
VSSD
I Digital Ground: Ground path for digital signals. It is important to have a separate
path for each ground signal to minimize the noise.
REC
I Record: The device starts recording whenever REC is Low. This pin must remain
Low during recording. A recording cycle is completed when either REC returns to
High or end of memory is reached, then the device automatically powers down to
standby mode. An End-of-Message (EOM) marker is internally generated, enabling a
subsequent playback cycle to terminate appropriately. Recording takes precedence
over the playback operation. If REC is pulled Low during a playback cycle, the
playback immediately ceases and recording begins. This pin has an internal pull-up
device[1]. Holding this pin at Low after recording will increase standby current. The
pin is internally debounced on the falling edge from a push-button switch.
PLAYE
I Edge-Triggered Playback: A playback operation begins when a Low-going
transition occurs on this pin. Playback continues until an End-of-Message (EOM)
marker is encountered or the end of memory is reached. Upon completion of the
playback cycle, the device automatically powers down into standby mode. Taking
PLAYE to High during playback will not terminate the current operation. This pin
has an internal pull-up device[1]. Holding this pin at Low after playback will increase
standby current.
PLAYL
I Level-Triggered Playback: When this input level is Low, a playback cycle is
initiated. Playback stops when PLAYL returns to High. If PLAYL remains Low
constantly, the device will perform a looping playback function. This pin has an
internal pull-up device[1].
MICIN
MICOUT
Microphone Input: The MICIN transfers input signal to the on-chip microphone
amplifier. The input signal should be AC coupled to this pin via a series capacitor.
The gain of the microphone amplifier is controlled by two external resistors, RI and
RO.
O Microphone Output: Output of the microphone amplifier.
SP- O SP-: The negative signal of the differential speaker outputs. This output together with
the SP+ are used to drive an 8Ω speaker differentially.
VSSA
I Analog Ground: Ground path for analog signals. It is important to have a separate
path for each ground signal to minimize the noise.
SP+ O SP+: This is the positive signal of the differential speaker outputs. This output
together with the SP- act as a differential output to drive an 8Ω speaker directly. The
differential output provides output power of up to four times over a single-ended
output. Furthermore, when differential output is used, coupling capacitor is not
needed. A single-ended output configuration will require an AC-coupling capacitor
between the speaker pin and the speaker. The SP+ pin and the SP- pin are
internally connected through a 50 KΩ resistance. While not in playback mode, they
are floating.
Publication Release Date: Feb 12, 2009
- 5 - Revision A03
5 Page 
ISD18A04
Operation Power-Down TDb2 TBeep TSettle
REC
LED
Sp+
MICIN
Record
TStop
Power-
Down
FIGURE 3: RECORD MESSAGE UNTIL REC GOES HIGH WITH BEEP FEATURE
Operation Power-Down TDb2 TBeep TSettle
REC
LED
Sp+
MICIN
Record
TStop
Power-
Down
FIGURE 4: RECORD MESSAGE UNTIL ARRAY IS FULL WITH BEEP FEATURE
- 11 -
Publication Release Date: Feb 12, 2009
Revision A03
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet ISD18A04.PDF ] | |
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