Isd1916, Functional description – Rainbow Electronics ISD1916 User Manual
Page 9
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.
A
DDRESS
T
RIGGER
(
NORM
)
O
PERATION
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.