Manual

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