Rainbow Electronics ISD18B12 - Manual (Page 6)

ISD18B12
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5. FUNCTIONAL DESCRIPTION
For the following related operations , if SE is not enabled, then no beep sound is heard. Also, the timing diagrams
may not be in direct proportional scale.
5.1. Level-triggered Record ( RECL ) Operation :
• Recording starts from beginning of the memory and LEDR is on.
• Recording ceases whenever RECL returns to High or when end of memory is reached and LEDR is
off.
• Then device will automatically power down.
Fig. 1: Record–Level ( RECL ) function till memory full
T
Deb
RECL
LEDR
T
r
T
f
MicIn
LEDP
T
D1
Memory Full
T
P2
T
B1
T
B2
BEEP
(Optional)
5.2. Edge-triggered Record ( RECE )Operation :
• Recording starts from beginning of the memory and LEDR is on.
• Recording ceases whenever a subsequent trigger occurs at RECE or when end of memory is reached
and LEDR is off.
• Then device will automatically power down.
Fig. 2: Record–Edge ( RECE ) function with on-off
T
B2
T
Deb
RECL
LEDR
T
r
MicIn
LEDP
T
D1
Memory Full
T
P2
T
B1
BEEP
(Optional)
T
f
T
D1
T
B1
T
Deb
T
B2
T
P2
T
Deb
Stop