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FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSIS FEATURES
The current recopy feature for OUT1:5 is disabled during
a high over-current shutdown phase (t 2 ) and is only enabled
during low over-current shutdown thresholds. The current
available in CSNS output pin for MUX[2,0] bits set to “111”,
recopy output delivers current only during ON time of the
output switch without overshoot (aperiodic settling).
The current recopy is not active in Fail mode.
With a calibration strategy, the output current sensing
precision can be improved significantly. One calibration point
at 25 °C for 50% of FSR allows removing part to part
contribution. So, the calibrated part precision goes down to ?
+/-6.0% over [20% - 75%] output current FSR, over voltage
range (10 V to 16 V) and temperature range (-40 to 125 °C).
2.5
2
1.5
1
0.5
typ
min
max
With dedicated calibration points, the current recopy
allows diagnosing lamp damage in paralleling operations, like
0
-40
-20
0
20
40 60 80 100
120
140
160
180
as flasher topology. The Figure 15 summaries test results
covering 99.74% of parts (device ageing not included) for
Standard lamps and LEDs.
Board tem perature (°C)
Figure 16. Analog temperature precision
The board temperature feedback is not active in Fail
mode.
With a calibration strategy, the temperature monitoring
precision can be improved. So, one calibration point at 25 °C
allows removing part to part contribution, as presented in
2.5
typ
min
max
2
1.5
1
Orange = LED mode
0.5
Blue = lamp mode (default mode)
0
Figure 15. Current sense precision with calibration
-40
-20
0
20
40 60 80 100
Board tem perature (°C)
120
140
160
180
strategy for OUT1/5
Board Temperature Feedback
The 10XS3535 provides a voltage proportional to the
temperature on the GND flag. This analog feedback is
Figure 17. Analog temperature precision with
calibration strategy
Output Status
The 10XS3535 provides the state of OUT1:OUT5 outputs
in real time through SPI. The OUT bit is set to logic [1] when
the corresponding output voltage is closed to half of battery.
This bit allows synchronizing current sense and diagnosing
short-circuit between OUT and VBAT terminals.
TEMPERATURE PREWARNING
The 10XS3535 provides a temperature prewarning
reported via the SPI (OTW bit) in Normal mode. The
information is latched. To delatch, a read SPI command is
needed. In case of a Power on Reset, the fault will be reset.
MC10XS3535
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
37
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