908E626 Datasheet, PDF (23/38 Pages) Freescale Semiconductor, Inc – Integrated Stepper Motor Driver with Embedded MCU and LIN Serial Communication

• Overtemperature protection.
• Overvoltage and undervoltage protection.
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
• Current limitation feature (low side MOSFET).
VSUP
On/Off
Status
High-Side Driver
Charge Pump,
Overtemperature Protection,
Overcurrent Protection
Control
BEMF
On/Off
Status
Current
Limit
Low-Side Driver
Current Recopy,
Current Limitation,
Overcurrent Protection
HBx
GND
Figure 11. Half-Bridge Push-Pull Output Driver
Half-Bridge Control
Each output MOSFET can be controlled individually. The
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.
To avoid both MOSFETs (high side and low side) of one
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_SS is not below a
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.
Half-Bridge Output Register (HBOUT)
Register Name and Address: HBOUT - $01
Bit7 6
5
4
3
2
1 Bit0
Read _{HB4_ HB4_ HB3_ HB3_ HB2_ HB2_ HB1_ HB1_}
Write ^H
L
H
L
H
L
H
L
Reset 0
0
0
0
0
0
0
0
HBx_L — Low-Side On / Off Bits
These read / write bits turn on the low-side MOSFETs.
Reset clears the HBx_L bits.
• 1 = Low-side MOSFET turned on for half-bridge output
x.
• 0 = Low-side MOSFET turned off for half-bridge output
x.
HBx_H — High-Side On/Off Bits
These read / write bits turn on the high-side MOSFETs.
Reset clears the HBx_H bits.
• 1 = High-side MOSFET turned on for half-bridge output
x.
Analog Integrated Circuit Device Data
Freescale Semiconductor
908E626
23