mm908e626 Freescale Semiconductor, Inc, mm908e626 Datasheet - Page 26

• Manufacturer Part Number: mm908e626
• Description: Integrated Stepper Motor Driver With Embedded Mcu And Lin Serial Communication
• Manufacturer: Freescale Semiconductor, Inc

HALF-BRIDGE OVERTEMPERATURE
PROTECTION
warning with the HTF in the Interrupt Flag Register (IFR). In
order to protect the outputs against overtemperature, the
High-Temperature Reset must be enabled. If this value is
reached, the part generates a reset and disables all power
outputs.
HALF-BRIDGE OVERCURRENT PROTECTION
to VSUP, and load shorts.
the high-side MOSFETs on all HB high-side MOSFETs are
switched off automatically. In the event an overcurrent on the
low side is detected, all HB low-side MOSFETs are switched
off automatically. In both cases, the overcurrent status flag
HB_OCF in the System Status Register (SYSSTAT) is set.
enabled) by writing a logic [1] to the HB_OCF flag in the
System Status Register or by reset.
HALF-BRIDGE OVERVOLTAGE / UNDERVOLTAGE
undervoltage and overvoltage conditions. This protection is
26
908E626
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
The half-bridge outputs provide an overtemperature pre-
The half-bridges are protected against short to GND, short
In the event an overcurrent on the high side is detected,
The overcurrent status flag is cleared (and the outputs re-
The half-bridge outputs are protected against
1
Figure 14. BEMF Signal Generation
done by the low- and high-voltage interrupt circuitry. If one of
these flags (LVF, HVF) is set, the outputs are automatically
disabled.
(and the outputs re-enabled) by writing a logic [1] to the LVF /
this flag is useless as long as a high- or low-voltage condition
is present.
Half-Bridge Control Register (HBCTL)
OFC_EN — H-Bridge Offset Chopping Enable Bit
the OFC_EN bit.
HVF flags in the Interrupt Flag Register or by reset. Clearing
Reset
Read
Write
The overvoltage / undervoltage status flags are cleared
This read / write bit enables offset chopping. Reset clears
• 1 = Offset chopping enabled.
• 0 = Offset chopping disabled.
BEMF Signal
Coil Current
Voltage on
OFC_EN
Bit 7
Register Name and Address: HBCTL - $02
0
CSA
6
0
1
Analog Integrated Circuit Device Data
5
0
0
4
0
0
Freescale Semiconductor
3
0
0
CLS2
2
0
CLS1
1
0
CLS0
Bit 0
0