MM908E625ACDWB/R2 Motorola, MM908E625ACDWB/R2 Datasheet - Page 33

• Manufacturer Part Number: MM908E625ACDWB/R2
• Description: Integrated Quad Half H-Bridge with Power Supply / Embedded MCU / and LIN Serial Communication
• Manufacturer: Motorola

CLS2:CLS0—H-Bridge Current Limitation Selection Bits
according to
High-Side Overtemperature Protection
warning with the HTF in the Interrupt Flag Register. In order to
protect the output against overtemperature, the High-
Temperature Reset must be enabled. If this value is reached,
the part generates a reset and disables all power outputs.
High-Side Overcurrent Protection
event overcurrent limit is or was reached, the output
automatically switches off and the overcurrent flag is set.
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
Table 5. H-Bridge Current Limitation Value Selection Bits
CLS2
These read/write bits select the current limitation value
The high-side output provides an overtemperature pre-
The high-side output is protected against overcurrent. In the
0
0
0
0
1
1
1
1
CLS1
Table
0
0
1
1
0
0
1
1
Control
5. Reset clears the CLS2:CLS0 bits.
CLS0
0
1
0
1
0
1
0
1
Freescale Semiconductor, Inc.
Current
On/Off
Status
Limit
For More Information On This Product,
Current Limit
260 mA (typ)
370 mA (typ)
550 mA (typ)
740 mA (typ)
55 mA (typ)
No Limit
Go to: www.freescale.com
Overcurrent Protection,
Inrush Current Limiter
Figure 19. High-Side Circuitry
High-Side Driver
Charge Pump,
High-Side Driver
targeted for driving lamps. The high side is protected against
overtemperature. To limit the high inrush current of bulbs,
overcurrent protection circuitry is used to limit the current. The
output is enabled with bit PSON in the System Control Register
and can be switched on/off with bit HS_ON in the Power Output
Register.
connection to external lamp.
High-Side Overvoltage/Undervoltage Protection
undervoltage/overvoltage conditions. This protection is done
by the low- and high-voltage interrupt circuitry. If one of these
flags (LVF, HVF) is set, the output is disabled.
the output re-enabled by writing a logic [1] to the LVF/HVF flags
in the Interrupt Flag Register or by reset. Clearing this flag is
useless as long as a high- or low-voltage condition is present.
the 908E625 prevents an overcurrent shutdown during this
inrush. If an PWM frequency is supplied to the FGEN output
during the switching on of a bulb, the inrush current is limited to
the overcurrent shutdown limit. This means if the current
reaches the overcurrent shutdown, the high side will be
switched off, but each rising edge on the FGEN input will enable
the driver again.
or a real shutdown, the software must check if the overcurrent
status flag (HS_OCF) in the System Status Register is set
beyond a certain period of time. The overcurrent status flag is
cleared by writing a logic [1] to the HS_OCF in the System
Status Register (see
The high-side output is a low-resistive high-side switch
The high-side output terminal, HS, is protected against
The overvoltage/undervoltage status flags are cleared and
Due to the high inrush current of bulbs, a special feature of
To distinguish between a shutdown due to an inrush current
Figure 19
VSUP
depicts the high-side switch circuitry and
Figure
20, page 34).
HS
908E625
33