IC-LO Datasheet, PDF (15/21 Pages) IC-Haus GmbH – TRIANGULATION SENSOR

iC-LO
TRIANGULATION SENSOR
preliminary
Light pulse
t
sample
t(SKO)
Single measurement
Figure 5: Single measurement
Rev A1, Page 15/21
Switching matrix
Internal switching state SOI and warning state WARNI
are determined from the filtered comparator outputs
according to the following truth table (Table 21):
SKO
Addr. 0x0A; bit 7:4
RW
Code
Description
0x0
1.5 µs
0x1
2 µs
...
0xF
9 µs
Table 20: Shifting the sample point in time
KDF
0
0
0
0
1
1
1
1
KSwF KSeF SOI
1
1
0
0
1
0
0
0
0
1
0
0
1
1
1
0
1
1
0
0
0
1
0
0
WARNI
0
0
0
0
0
1
0
0
System state
Object detected far, enough light
Object detected far, low light
Object detection impossible, not enough light
Invalid configuration (see page 14)
Object detected near, enough light
Object detected near, low light
Object detection impossible, not enough light
Invalid configuration (see page 14)
Table 21: Switching matrix
Output drivers
The polarity of the switching output can be selected
due to the connected switch using SOCNO. Output
WARN is equivalent to the internal WARNI signal.
Furthermore, in mode PERIODIC_MEASURE (Table
27) a rise and fall delay can be configured for the warn-
ing and switching outputs (see Figure 6 by way of ex-
ample).
SOCNO
Code
0
1
Addr. 0x0C; bit 0
RW
Description
Configures the output SO as normally open and
NSO as normally closed (SO = SOI)
Configures the output SO as normally closed and
NSO as normally open (SO = SOI)
Table 22: Output configuration
SOI
t<t
AR
SO
t=t t=t
AR
AF
t=t t=t
AR
AF
If the switching outputs SO and NSO are not required,
they can be disabled by SOEN. A zero is then output
at both outputs.
SOEN
Addr. 0x0C; bit 4
RW
Code
Description
0
SO and NSO disabled
1
SO and NSO enabled
Table 23: Output activation
Figure 6: Rise and fall delay
Rise delay t_AR suppresses peaks that are shorter than
t_AR (first SOI peak in Figure 6). If SOI is active for
longer than t_AR, switching output SO is activated. If
SOI then drops to 0, SO only switches back when fall
delay time t_AF has elapsed (second SOI peak in Fig-
ure 6). If SOI remains at 1 after the fall delay time
has elapsed, SO trails the falling edge at SOI directly
(third SOI peak in Figure 6). The fall delay time is thus
equivalent to a minimum pulse duration at the outputs.