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参数资料
型号： MM908E622ACDWB/R2
厂商： FREESCALE SEMICONDUCTOR INC
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO54
封装： 17.90 X 7.50 MM, 0.65 MM PITCH, PLASTIC, SOIC-54
文件页数： 32/66页
文件大小： 1277K
代理商： MM908E622ACDWB/R2
Analog Integrated Circuit Device Data
38
Freescale Semiconductor
908E622
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Figure 22. 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). The HBx_L and HBx_H
bits 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 is in PWM mode.
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_H, HBx_L — Half-bridge Output Switches
These read/write bits select the output of each half-bridge
output according to the following table. Reset clears all
HBx_H, HBx_L bits.
Table 9. Half-Bridge Configuration
Half-bridge PWM mode
The PWM mode is selected by setting both HBxL and
HBxH of one Half-bridge to “1”. In this mode, the high side
MOSFET is controlled by the incoming PWM signal on the
PWM pin (see Figure 2, page 2).
If the incoming signal is high, the high side MOSFET is
switched on.
High Side Driver
Charge Pump
Over-temperature Protection
Over-current Protection
Low Side Driver
Current Recopy
Current Limitation
Active Clamp
Over-current Protection
Control
On/Off
Status
On/Off
Status
PWM
HBx
VSUP
GND
PWM
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
HBx_H
HBx_L
Mode
00
Low side and high side MOSFET off
01
High side MOSFET off,
low side MOSFET on
10
High side MOSFET on,
low side MOSFET off
11
High side MOSFET in PWM mode
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相关代理商/技术参数
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