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™
PROFET
+2 12V Arduino Shield
2 Board description
2.4
Pin definitions and functions
Table 1
Pin definitions and functions
PIN
Symbol
D2
P1.4
D3
IN4
D4
LED1
D5
LED2
D6
DEN1+DEN3
D7
OLOFF
D8
DEN2+DEN4
D9
IN1
D10
IN2
D11
IN3
D12
LED3
D13
LED4
GND@2
GND
GND@1
GND
GND@0
GND
VIN
VIN
A0
A0 - P2.6
A1
A1 - P2.8
A2
A2 - P2.9
A3
A3 - P2.10
2.5
Additional information
The following chapters give the user in-depth information about the board's special features.
2.5.1
Open Load in OFF Detection (OLOFF)
For some loads, it may be necessary to check their availability without powering them up. For example, it may
be necessary to check if bulbs or LEDS (or the cable they are connected to) are intact or broken, without
creating a flash light by switching them on.
In the example circuitry in
powerful enough to pull up the output if there is no load connected, but not powerful enough to activate the
load in a distrubing manner. If the output voltage of a PROFET
will be lower than V
DS(OLOFF)
= "low".
To avoid continuous power losses in OFF state in open load condition, and to be able to distinguish open load
from short-to-battery in OFF state, the pull-up circuitry must be deactivated.
User Manual
I/O
I
O
O
O
O
O
O
O
O
O
O
O
-
-
-
-
I
I
I
I
Figure 7
below, a small current (few milliamperes) is injected into the output,
™
, and the PROFET
will provide an open load signal I
Function
Push button digital (optional)
™
Input PROFET
+2 device U4
Indicator LED1
Indicator LED2
Diagnosis enable PROFET
Option for Open Load in OFF Detection
Diagnosis enable PROFET
™
Input PROFET
+2 device U1
™
Input PROFET
+2 device U2
™
Input PROFET
+2 device U3
Indicator LED3
Indicator LED4
Ground
Ground
Ground
Supply voltage
Push button analog (optional)
V
bat
Current sense of PROFET
Current sense of PROFET
™
+2 12V becomes too high, drain-source voltage
11
™
+2 Device U1+U3
™
+2 Device U2+U4
™
+2 device U1+U2
™
+2 device U3+U4
, if DEN = "high" while IN
IS(OLOFF)
2019-10-23
Rev. 1.00
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