908E425 Datasheet, PDF (30/49 Pages) Freescale Semiconductor, Inc – Integrated Quad Half H-Bridge with Power Supply, Embedded MCU, and LIN Serial Communication

FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
• 1 = Hall-effect sensor input pin current above threshold
• 0 = Hall-effect sensor input pin current below threshold
HALF-BRIDGES
Outputs HB1 : HB4 provide four low-resistive half-bridge
output stages. The half-bridges can be used in H-Bridge,
high-side, or low-side configurations.
Reset clears all bits in the H-Bridge Output Register
(HBOUT) owing to the fact that all half-bridge outputs are
switched off.
HB1: HB4 output features:
• Short circuit (overcurrent) protection on high-side and
low-side MOSFETs
• Current recopy feature (low side MOSFET)
• Overtemperature protection
• Overvoltage and undervoltage protection
• 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 17. 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
Bits 7
6
5
4
3
2
1
0
Read ^{HB4_H HB4_L HB3_H HB3_L HB2_H HB2_L HB1_H HB1_L}
Write
Reset ⁰
0
0
0
0
0
0
0
LOW-SIDE ON / OFF BITS (HBX_L )
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
908E425
30
Analog Integrated Circuit Device Data
Freescale Semiconductor