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ISD2532 Datasheet(PDF) 31 Page - Winbond

Part No. ISD2532
Description  SINGLE-CHIP, MULTIPLE-MESSAGES, VOICE RECORD/PLAYBACK DEVICE 32-, 40-, 48-, AND 64-SECOND DURATION
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Maker  WINBOND [Winbond]
Homepage  http://www.winbond.com
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 31 page
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ISD2532/40/48/64
TABLE 13: APPLICATION EXAMPLE – BASIC DEVICE CONTROL
Control Step
Function
Action
1
Power up chip and select Record/Playback Mode
1. PD = LOW, 2. P/ R = As desired
2
Set message address for record/playback
Set addresses A0-A8
3A
Begin playback
P/ R = HIGH, CE = Pulse LOW
3B
Begin record
P/ R = LOW, CE = LOW
4A
End playback
Automatic
4B
End record
PD or CE = HIGH
TABLE 14: APPLICATION EXAMPLE – PASSIVE COMPONENT FUNCTIONS
Parts
Function
Comments
R1
Microphone power supply decoupling
Reduces power supply noise
R2
Release time constant
Sets release time for AGC
R3, R5
Microphone biasing resistors
Provides biasing for microphone operation
R4
Series limiting resistor
Reduces level to prevent distortion at
higher supply voltages
R6
Series limiting resistor
Reduces level to high supply voltages
C1, C5
Microphone DC-blocking capacitor Low-
frequency cutoff
Decouples microphone bias from chip.
Provides single-pole low-frequency cutoff
and command mode noise rejection.
C2
Attack/Release time constant
Sets attack/release time for AGC
C3
Low-frequency cutoff capacitor
Provides additional pole for low-frequency
cutoff
C4
Microphone power supply decoupling
Reduces power supply noise
C6, C7, C8
Power supply capacitors
Filter and bypass of power supply
Publication Release Date: June 2003
- 31 -
Revision 1.0




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