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| 型号： | KIT908EINTFC |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 24/49页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL 908E625 QUAD W/MCU/LIN |
| 标准包装： | 1 |
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Analog Integrated Circuit Device Data
30
Freescale Semiconductor
908E625
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
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 (over-current) protection on high side and
low side MOSFETs
Current recopy feature (low side MOSFET)
Over-temperature protection
Over-voltage and under-voltage protection
Current limitation feature (low side MOSFET)
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 VSS 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)
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
0 = Low side MOSFET turned off for half-bridge output x
High Side Driver
Charge Pump,
OVer-temperature Protection,
OVer-current Protection
Low Side Driver
Current Recopy,
Current Limitation,
OVer-current Protection
Control
On/Off
Status
On/Off
Status
Current
Limit
HBx
VSUP
GND
BEMF
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
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