1. GENERAL DESCRIPTION ............................................................................................................................... 3
2. FEATURES ....................................................................................................................................................... 3
Direct Mode ............................................................................................................................................... 4
Direct Mode ............................................................................................................................................. 16
Other Operations .................................................................................................................................... 19
DC Parameters ....................................................................................................................................... 22
AC Parameters ....................................................................................................................................... 23
28-Lead 300-Mil Plastic Small Outline Integrated Circuit (SOIC) ........................................................ 26
11. ORDERING INFORMATION .......................................................................................................................... 27
12. VERSION HISTORY ....................................................................................................................................... 28
2
Publication Release Date: Jan 5, 2009
Revision 0.51
ISD1900
1. GENERAL DESCRIPTION
Nuvoton’s ISD1900 ChipCorder Series is a single-chip multiple-message record/playback device with dual
operating modes and wide operating voltage ranging from 2.4V to 5.5V. The sampling frequency can be
selected from 4 to 12 kHz via an external resistor, which also determines the duration. The device is designed
for mostly standalone applications, and of course, it can be manipulated by a microcontroller, if necessary.
The two operating modes are Address Mode and Direct Mode. While in Address Mode, both record and
playback operations are manipulated according to the start address and end address specified through the start
address and end address pins. In Direct Mode, the device can configure the memory up to as many as eight
similar duration messages, pending upon the fixed message configuration settings. With the record or playback
feature being pre-selected, each message can be randomly accessed via its message control pin.
The device has a selectable differential microphone input with AGC feature or single-ended analog input, AnaIn,
under feed-through mode. The audio output is either a differential Class-D PWM direct-drive or a single-ended
voltage output (AUX out), depending on the derivative selected.
®
2. FEATURES
The ISD1900 is a multiple messages record/playback device with two operational modes: Address Mode and
Direct Mode.
Supply voltage: 2.4V to 5.5V.
External resistor, Rosc, selects sampling frequency and duration.
Sampling Frequency
12 kHz
8 kHz
6.4 kHz
Rosc
53.3 KΩ
80 KΩ
100 KΩ
ISD1916
10.6 sec
16 sec
20 sec
ISD1932
21.3 sec
32 sec
40 sec
ISD1964
42.6 sec
64 sec
80 sec
Mic+/Mic-: differential microphone inputs.
AGC: automatic gain control for microphone preamp circuit.
FT feed-through the AnaIn signal to the speaker outputs while AnaIn is converted from MIC+.
¯¯:
When both FT and
recording are
active, device will record AnaIn signal into memory with AnaIn signal output
¯¯
to speaker simultaneously.
SP+/SP-: Class-D PWM differential speaker drivers or single-ended voltage output, depending on the
derivative selected.
¯¯¯¯: LED is on during recording.
LED
Automatically power down after each operation cycle.
Playback takes precedence over the recording operation.
Temperature option: -40C to +85C (Industrial)
Packaging: available in SOIC only
5.3 kHz
120 KΩ
24 sec
48 sec
96 sec
4 kHz
160 KΩ
32 sec
64 sec
128 sec
2.1. A
DDRESS
M
ODE
3
Publication Release Date: Jan 5, 2009
Revision 0.51
ISD1900
While in Address Mode, flexible message duration is defined by start address and end address.
Utilize four start address pins (S0, S1, S2 & S3) and four end address pins (E0, E1, E2 & E3) to specify
the message duration.
¯¯¯¯: Level-hold or Edge-trigger (toggle on-off) recording from start to end addresses.
REC
¯¯¯¯¯: Edge-trigger playback from start to end address and stops at EOM marker, if EOM is prior to end
PlayE
address. Toggle on-off.
¯¯¯¯¯: Level-hold playback from start to end address.
PlayL
from start to end address.
2.2. D
IRECT
M
ODE
While Direct Mode is active, utilizing the configuration pins, FMC1, FMC2 & FMC3, to define up to eight
similar duration messages for random access.
The control pins are: M1 ~ M8 (message activation) and ¯¯/P (record or playback selection).
¯¯
¯¯
R
The record or playback operation is pre-defined by the ¯¯/P pin.
R
Each message can be randomly accessed via its message control pin (M1 ~ M8) and the desired
¯¯
¯¯
operation is facilitated accordingly.
Also, if constantly Low, device will loop playback
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