ISD1964SYI Datasheet, PDF (9/29 Pages) List of Unclassifed Manufacturers – SINGLE-CHIP, MULTIPLE-MESSAGE VOICE RECORD/PLAYBACK DEVICE

ISD1900
PIN NAME
SP+
V_SSP1
AGC
MIC+ / AnaIn
MIC- / NC
Rosc
V_CCA
¯L¯E¯D¯
¯P¯la¯y¯E¯/FMC2
¯R¯E¯C¯/¯R¯/P
¯X¯C¯L¯K¯/FMC3
PIN #
15
16
17
18
19
20
21
22
23
24
25
I/O
FUNCTION
O Depending on the derivative selected, it could be:
SP+: Positive signal of the differential Class-D PWM speaker outputs. This
output, together with the SP-, is used to drive an 8Ω speaker directly.
Or,
AUX out: single-ended voltage output.
I Ground: Ground for positive PWM speaker driver.
I _{Automatic Gain Control (AGC): The AGC adjusts the gain of the}
preamplifier dynamically to compensate for the wide range of microphone
input levels. The AGC allows the full range of signals to be recorded with
minimal distortion. The AGC is designed to operate with a nominal
capacitor of 4.7 µF connected to this pin.
Connecting this pin to ground (V_SSA) provides maximum gain to the
preamplifier circuitry. Conversely, connecting this pin to the power supply
(V_CCA) provides minimum gain to the preamplifier circuitry.
I
MIC+: Non-inverting input of the differential microphone signal.
AnaIn: When F¯¯T is selected, the MIC+ input is configured to a single-ended
input with 1Vp-p maximum input amplitude and feed-through to the speaker
outputs.
I MIC-: Inverting input of the differential microphone signal. While F¯¯T is
enabled, MIC- pin is disabled and must be floated.
I Oscillator Resistor: Connect an external resistor from this pin to V_SSA to
select the internal sampling frequency.
I Analog Power Supply: Power supply for analog circuits.
O LED output: During recording, this output is Low. Also, ¯L¯E¯D¯ pulses Low
momentarily at the end of playback.
I
¯P¯la¯y¯E¯: In Address Mode, low active input, edge-trigger playback from start
to end addresses & toggle on-off. Debounce & internal pull-up existed.
FMC2: When Direct Mode is active, FMC2, together with FMC1 & FMC3,
setup various fixed-message configurations.
I
¯R¯E¯C¯: In Address Mode, level-hold (after 1 sec holding) or edge-trigger
(toggle on-off), low active, recording from start to end addresses. Debounce
& internal pull-up existed.
¯R¯/P ( When Direct Mode is active):
• When ¯R¯/P is set to Low, level-hold record operation is selected.
When ¯R¯/P is set to High, edge-trigger & toggle on-off playback operation is
selected.
I
External Clock: In Address Mode, low active and level-hold input. As ¯X¯C¯L¯K¯
activated, Rosc pin accepts external clock input signal, provided resistor at
Rosc must be removed. Connecting this pin to High enables device running
on internal clock via Rosc resistor. If not used, ¯X¯C¯L¯K¯ must be at high level.
When Direct Mode is active, FMC3, together with FMC1 & FMC2, setup
various fixed-message configurations.
F¯¯T
26
I Feed-Through: Low active input, Level-hold, debounce & Internal pull-up
required. When F¯¯T is selected, the MIC+ input is configured to a single-
ended input with 1Vp-p maximum input amplitude and feed-through to the
speaker outputs.
Publication Release Date: Jan 5, 2009
9
Revision 0.51