17XSF500 Datasheet, PDF (37/70 Pages) Freescale Semiconductor, Inc – Penta 17 mOhm High Side Switch

When the device is in Fail mode, the restart of the outputs is controlled by the auto-restart feature.
6.1.3.3.2 Overvoltage
The device is protected against overvoltage on V_PWR.
During:
• jump start condition, the device may be operated, but with respect to the device limits
• load dump condition (V_{PWR LD MAX} = 40 V) the device does not conduct energy to the loads
The overvoltage condition (V_PWR > V_{PWR OVF}) is reported in the:
• device status flag (DSF) in the registers #1… #7
• overvoltage flag (OVF) inside the device status register #7
To delatch the diagnosis:
• the overvoltage condition must be removed
• a read command of the device status register #7 must be performed
In case of an overvoltage (V_PWR > V_{PWR HIGH}), the device is not “short-circuit“ proof.
6.1.3.3.3 Electrical Characterization
Table 11. Electrical Characteristics
Characteristics noted under conditions 7.0 V  V_PWR  18 V, -40 C  T_A  125 C, GND = 0 V, unless otherwise noted. Typical
values noted reflect the approximate parameter means at T_A = 25 °C under nominal conditions, unless otherwise noted.
Symbol
Characteristic
Min
Typ
Max
Unit Notes
SUPPLY VPWR
V_{PWR UVF} ^{Supply undervoltage}
V_{PWR UVF} Supply undervoltage Hysteresis
HYS
V_{PWR OVF} ^{Supply Overvoltage}
V_{PWR OVF} Supply Overvoltage Hysteresis
HYS
V_{PWR LD MAX} ^{Supply Load Dump Voltage (2.0 min at 25 °C)}
V_{PWR HIGH} Maximum Supply Voltage for Short-circuit Protection
t_{FAULT SD}
Fault Deglitch Time
• UV and OV
5.0
5.25
200
350
28
30
0.5
1.0
40
–
32
–
2.0
3.5
5.5
V
500
mV
32
V
1.5
V
–
V
–
V
µs
5.5
6.1.3.4 Charge Pump Protection
The charge pump voltage is monitored to protect the smart switches in case of:
• power up
• failure of external capacitor
• failure of charge pump circuitry
During power up, when the charge pump voltage has not yet settled to its nominal output voltage range, the outputs cannot be
turned on. Any turn on command during this phase is executed immediately after settling of the charge pump.
When the charge pump voltage is not within its nominal output voltage range:
• the power outputs are disabled immediately after the deglitch time t_{FAULT SD}
• the failure status is reported after t_{FAULT SD} in the device status flag DSF in the registers #1… #7 and the CPF in
the quick status register #1
• Any turn on command during this phase is executed, including the OCHI windows immediately after the charge
pump output voltage has reached its valid range
To delatch the diagnosis:
• the charge pump failure condition must be removed
MC17XSF500
Analog Integrated Circuit Device Data
Freescale Semiconductor
37