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| 型号： | MM908E626AVEK |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | FLASH, 32 MHz, MICROCONTROLLER, PDSO54 |
| 封装： | 5.10 X 10.30 MM, 0.65 MM PITCH, LEAD FREE, SOIC-54 |
| 文件页数： | 18/43页 |
| 文件大小： | 842K |
| 代理商： | MM908E626AVEK |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
25
908E626
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
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 12. 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)
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.
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
Bit7
6
5
4
3
2
1
Bit0
Read
HB4_H HB4_L HB3_H HB3_L HB2_H HB2_L HB1_H HB1_L
Write
Reset
0
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