Instruction Manual

ISD1916
Publication Release Date: September 11, 2007
- 9 - Revision 0
6. FUNCTIONAL DESCRIPTION
There are two operational modes: address trigger ( NORM ) and direct trigger ( MODE ). After a new
condition is selected on
NORM / MODE , the power must be cycled to enable it.
6.1. ADDRESS TRIGGER (
NORM
) OPERATION
The start address bits (
S0
,
S1
,
S2
&
S3
) and end address bits (
E0
, E1, E2 &
E3
) are used
to access the memory location and they can divide the memory into a maximum of 16 slots. As
an example of I1916, they are defined as follows:
S3
( E3 )
S2
( E2 )
S1
( E1)
S0
( E0 )
Row # I1916
Duration [s]
0 0 0 0 0 0
0 0 0 1 8 1.0
0 0 1 0 16 2.0
0 0 1 1 24 3.0
0 1 0 0 32 4.0
0 1 0 1 40 5.0
0 1 1 0 48 6.0
0 1 1 1 56 7.0
1 0 0 0 64 8.0
1 0 0 1 72 9.0
1 0 1 0 80 10.0
1 0 1 1 88 11.0
1 1 0 0 96 12.0
1 1 0 1 104 13.0
1 1 1 0 112 14.0
1 1 1 1 120 15.0
6.1.1. Record (
REC
) Operation
• Low active input, level-hold for level-trigger or falling edge for edge-trigger with debounce required.
• For 8kHz sampling frequency, if
REC is held at Low for a period equal to 1 sec or more, then level
recording is activated. However, if
REC is pulsed Low for less than 1 sec, then edge-trigger recording
is initiated.
• For 6.4kHz sampling frequency, if
REC is held at Low for a period equal to 1.25 sec or more, then level
recording is activated. However, if
REC is pulsed Low for less than 1.25 sec, then edge-trigger
recording is initiated.
• Recording begins from the start address to end address and
LED is on.
• Recording ceases whenever
REC
returns to High in level-hold mode or a subsequent lower going
pulse appears while in edge-trigger mode or when end address is reached. Then an EOM marker is
written at the end of message. And
LED
is off.
• Then the device will automatically power down.
• This pin has an internal pull-up device.
• Once
REC
is active, input on
FT
, NORM / MODE , S0 , S1 , S2 , S3 , E0 ,
E1
,
E2
or E3 is
illegal.