MC33580BAPNA Freescale, MC33580BAPNA Datasheet - Page 19

• Manufacturer Part Number: MC33580BAPNA
• Manufacturer: Freescale

Specifications of MC33580BAPNA

• Switch Type: High Side
• Power Switch Family: MC33580
• Input Voltage: 6 to 27V
• Power Switch On Resistance: 30mOhm
• Number Of Outputs: 4
• Mounting: Surface Mount
• Supply Current: 20mA
• Package Type: Power QFN
• Operating Temperature (min): -40C
• Operating Temperature Classification: Automotive
• Pin Count: 24
• Lead Free Status / RoHS Status: Compliant

resistance limiting the internal clamp current according to the
specification.
and is specified in the
bit (D15) of an incoming SPI message is toggled within the
minimum watchdog timeout period (WDTO), based on the
programmed value of the WDR, the device will operate
normally. If an internal watchdog timeout occurs before the
WD bit, the device will revert to a Fail-Safe mode until the
device is reinitialized.
depending upon the resistor RFS connected to the FSI pin,
regardless of the state of the various direct inputs and modes
(Table
except for overcurrent high and low detection levels, timing
and latched overtemperature which are reset to their default
value (SOCL, SOCH, OCTL and
watchdog, overvoltage, overtemperature, and overcurrent
circuitry (with default value) are fully operational.
WDTO bit D2 of the WD register. This bit is logic [1] when the
device is in Fail-Safe mode. The device can be brought out of
OVERTEMPERATURE FAULT (LATCHING OR
NON-LATCHING)
shutdown circuitry for each output structure.
unlatched through SPI with
the corresponding output. To remove the fault and be able to
turn ON again the outputs, the failure must be removed and:
Analog Integrated Circuit Device Data
Freescale Semiconductor
Table 6. Output State During Fail-Safe Mode
0 (shorted to ground)
The Watchdog timeout is a multiple of an internal oscillator
During the Fail-Safe mode, the outputs will be ON or OFF
In the Fail-Safe mode, the SPI register content is retained
The Fail-Safe mode can be detected by monitoring the
The 33580 incorporates overtemperature detection and
The overtemperature is latched per default and can be
An overtemperature fault condition results in turning OFF
• in Normal Mode: the corresponding output must be
commanded OFF and ON again in case of
overtemperature latched (
RFS (kΩ)
30 (open)
6).
6.0
15
Table
OT_latch_[0:3]
15, page 24. As long as the WD
Fail-Safe Mode Disabled
OT_latch bit = 0)
HS1 and HS3 OFF
OT_latch_[0:3] bits
HS0 and HS2 ON
High-Side State
HS1 : HS3 OFF
All HS OFF
PROTECTION AND DIAGNOSTIC FEATURES
HS0 ON
bits.
.
). Then the
the Fail-Safe mode by transitioning the WAKE and
from logic [1] to logic [0] or forcing the FSI pin to logic [0].
Table 5
device from the latched Fail-Safe mode.
operation is disabled.
Loss of V
even disconnected, all register content is reset. The outputs
can still be driven by the direct inputs IN0 : IN3. The 33580
uses the battery input to power the output MOSFET-related
current sense circuitry and any other internal logic providing
fail-safe device operation with no V
the watchdog, undervoltage, overvoltage, overtemperature
(latched), and overcurrent circuitry are fully operational with
default values.
FAULT MODE
driving the
fault condition is removed, except for overcurrent,
overtemperature (in case of latching configuration) and in
some cases of undervoltage.
reset by a new Switch ON command (via SPI or direct input
IN).
available (and reset) via the SO pin during the first valid SPI
communication (refer to
reported by SPI. If the overtemperature is latched, the SPI
reports OTF_s = [1] and OCLF_s = [1]. In case of non-
latched, OTF_s = [1] only is reported.
either a valid SPI read command or a power on reset of the
device.
If the FSI pin is tied to GND, the Watchdog fail-safe
If the external 5.0 V supply is not within specification, or
This 33580 indicates the faults below as they occur by
• Overtemperature fault
• Overvoltage and undervoltage fault
• Open load fault
• Overcurrent fault (high and low)
The
The
Fault information is retained in the fault register and is
• in Normal Mode: the corresponding output turns ON
• in Fail-Safe Mode: the FSI input must be grounded and
The overtemperature fault (one for each output) is
The fault bits will be cleared in the status register after
automatically if the temperature is below T
in case of unlatched overtemperature (
then set to its nominal voltage to switch ON the outputs.
FS
FS
summarizes the various methods for resetting the
DD
pin will automatically return to logic [1] when the
pin reports all faults. For latched faults, this pin is
FS
pin to logic [0]:
PROTECTION AND DIAGNOSTIC FEATURES
Table
FUNCTIONAL DEVICE OPERATION
17, page 26).
DD
supplied. In this state,
OT_latch bit = 1).
SD
-T
RST
SD(HYS)
33580
pins
19