參數(shù)資料
型號: MM908E626AVDWB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO54
封裝: 17.90 X 7.50 MM, 0.65 MM PITCH, LEAD FREE, PLASTIC, SOIC-54
文件頁數(shù): 18/44頁
文件大小: 833K
代理商: MM908E626AVDWB
Analog Integrated Circuit Device Data
Freescale Semiconductor
25
908E626
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
HVDDON—HVDD On Bit
This read/write bit enables HVDD output. Reset clears the
HVDDON bit.
1 = HVDD enabled.
0 = HVDD disabled.
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).
High-Side Driver
Charge Pump,
Overtemperature Protection,
Overcurrent Protection
Low-Side Driver
Current Recopy,
Current Limitation,
Overcurrent Protection
Control
On/Off
Status
On/Off
Status
Current
Limit
HBx
VSUP
GND
BEMF
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)
Bit7
6
5
4
3
2
1
Bit0
Read
Write
Reset
Register Name and Address: HBOUT - $01
HB4_
H
HB4_
L
HB3_
H
HB3_
L
HB2_
H
HB2_
L
HB1_
H
HB1_
L
0
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