mm908e626 Freescale Semiconductor, Inc, mm908e626 Datasheet - Page 23

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

Half-Bridge Control
general enable of the circuitry is done by setting PSON in the
System Control Register (SYSCTL). HBx_L and HBx_H form
one half-bridge. It is not possible to switch on both MOSFETs
in one half-bridge at the same time. If both bits are set, the
high-side MOSFET has a higher priority.
half-bridge being on at the same time, a break-before-make
circuit exists. Switching the high-side MOSFET on is inhibited
as long as the potential between gate and V
certain threshold. Switching the low-side MOSFET on is
blocked as long as the potential between gate and source of
the high-side MOSFET did not fall below a certain threshold.
Analog Integrated Circuit Device Data
Freescale Semiconductor
• Overtemperature protection.
• Overvoltage and undervoltage protection.
Each output MOSFET can be controlled individually. The
To avoid both MOSFETs (high side and low side) of one
Control
Current
On/Off
Status
On/Off
Status
BEMF
Figure 11. Half-Bridge Push-Pull Output Driver
Limit
SS
is not below a
Overtemperature Protection,
Overcurrent Protection
Overcurrent Protection
High-Side Driver
Low-Side Driver
Current Limitation,
Current Recopy,
Charge Pump,
Half-Bridge Output Register (HBOUT)
HBx_L — Low-Side On / Off Bits
Reset clears the HBx_L bits.
HBx_H — High-Side On/Off Bits
Reset clears the HBx_H bits.
Reset
Read
Write
• Current limitation feature (low side MOSFET).
These read / write bits turn on the low-side MOSFETs.
• 1 = Low-side MOSFET turned on for half-bridge output
• 0 = Low-side MOSFET turned off for half-bridge output
These read / write bits turn on the high-side MOSFETs.
• 1 = High-side MOSFET turned on for half-bridge output
x.
x.
x.
HB4
Bit 7
H
0
Register Name and Address: HBOUT - $01
_
HB4
6
L
0
_
HB3
H
5
0
LOGIC COMMANDS AND REGISTERS
_
FUNCTIONAL DEVICE OPERATION
HB3
4
L
0
_
VSUP
GND
HB2
3
H
0
_
HB2
2
L
0
_
HB1
H
1
0
_
908E626
HBx
HB1
Bit 0
L
0
23
_