Datasheet

Analog Integrated Circuit Device Data
34 Freescale Semiconductor
07XSC200
5.3.3.1 OpenLoad Detection in Off State
The OFF output OpenLoad fault is detected when the output voltage is higher than V
OLD(THRES)
pulled up with internal current
source (I
OLD(OFF)
) and reported as a fault condition when the output is disabled (OFF). The OFF Output OpenLoad fault is latched
into the status register or when the internal gate voltage is pulled low enough to turn OFF the output. The OL_OFF[0:1] fault bit
is set in the status register. If the OpenLoad fault is removed (FSB output pin goes to high), the status register will be cleared
after reading the register.
The OFF output OpenLoad protection can be disabled through SPI (OLOFF_DIS[0:1] bit).
5.3.3.2 OpenLoad Detection in On State
The ON output OpenLoad current thresholds can be chosen by the SPI to detect a standard bulbs or LEDs (OLLED[0:1] bit set
to logic [1]). In the case where load current drops below the defined current threshold OLON bit is set to logic [1], the output stays
ON and FSB is not disturbed.
5.3.3.3 OpenLoad Detection in On State For Led
OpenLoad for LEDs only (OLLED[0:1] set to logic [1]) is detected periodically each t
OLLED
(fully-on, D[6:0]=7F)
.
To detect OLLED
in fully-on state, the output must be ON at least t
OLLED.
To delatch the diagnosis, the condition should be removed and the SPI read operation is needed (OL_ON[0:1] bit). The ON output
open-load protection can be disabled through the SPI (OLON_DIS[0:1] bit).
5.3.3.4 Analog Current Recopy and Temperature Feedbacks
The CSNS pin is an analog output reporting a current proportional to the designed output current or a voltage proportional to the
temperature of the GND flag (pin #14). The routing is SPI programmable (TEMP_en, CSNS_en, CSNS_s[1,0] and CSNS_ratio_s
bits).
In case the current recopy is active, the CSNS output delivers current only during ON time of the output switch without overshoot.
The maximum current is 2.0
mA, typical. The typical value of external CSNS resistor connected to the ground is 2.5 k.
The current recopy is not active in Fail-safe mode.
5.3.3.5 Temperature Prewarning Detection
In Normal mode, the 07XSC200 provides a temperature prewarning reported via the SPI, in case the temperature of the GND
flag is higher than T
OTWAR
. This diagnosis (OTW bit set to [1]) is latched in the SPI DIAGR0 register. To delatch, a read SPI
command is needed.
5.3.4 Active Clamp ON VPWR
The device provides an active gate clamp circuit in order to limit the maximum transient V
PWR
voltage at V
PWR(CLAMP)
. In case
of an overload on an output, the corresponding output is turned off, which leads to high voltage at VPWR with an inductive V
PWR
line. When the V
PWR
voltage exceeds V
PWR(CLAMP)
threshold, the turn-off on the corresponding output is deactivated and all
HS[0:1] outputs are switched ON automatically to demagnetize the inductive battery line.
5.3.5 Reverse Battery on VPWR
The output survives the application of reverse voltage as low as -18 V. Under these conditions, the ON resistance of the output
is two times higher than a typical ohmic value in forward mode. No additional passive components are required except on the
V
DD
current path.