參數(shù)資料
型號(hào)： MM908E626R2
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： Integrated Stepper Motor Driver with Embedded MCU and LIN Serial Communication
中文描述： 集成的步進(jìn)電機(jī)驅(qū)動(dòng)器，帶有嵌入式微控制器和LIN串行通信
文件頁(yè)數(shù)： 26/32頁(yè)
文件大小： 303K
代理商： MM908E626R2
908E626
26
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
Figure 12. BEMF Signal Generation
Half-Bridge Overtemperature Protection
The half-bridge outputs provide an overtemperature pre-
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
The half-bridges are protected against short to GND, short to
VSUP, and load shorts.
In the event an overcurrent on the high side is detected, 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.
The overcurrent status flag is cleared (and the outputs re-
enabled) by writing a logic [1] to the HB_OCF flag in the System
Status Register or by reset.
Half-Bridge Overvoltage/Undervoltage
The half-bridge outputs are protected against undervoltage
and overvoltage conditions. This protection is done by the low-
and high-voltage interrupt circuitry. If one of these flags (LVF,
HVF) is set, the outputs are automatically disabled.
The overvoltage/undervoltage status flags are cleared (and
the outputs 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.
Half-Bridge Control Register (HBCTL)
OFC_EN—H-Bridge Offset Chopping Enable Bit
This read/write bit enables offset chopping. Reset clears the
OFC_EN bit.
1 = Offset chopping enabled.
0 = Offset chopping disabled.
CSA—H-Bridges Current Sense Amplification Select Bit
This read/write bit selects the current sense amplification of
the H-Bridges. Reset clears the CSA bit.
1 = Current sense amplification set for measuring 0.5 A.
0 = Current sense amplification set for measuring 2.5 A.
Coil Current
Voltage on
1
1
BEMF Signal
Register Name and Address: HBCTL - $02
Bit7
6
5
4
3
2
1
Bit0
Read
OFC_EN
CSA
0
0
0
CLS2
CLS1
CLS0
Write
Reset
0
0
0
0
0
0
0
0
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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