參數(shù)資料
型號(hào)： MM908E621ACDWB/R2
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, PLASTIC, SOIC-54
文件頁(yè)數(shù)： 33/65頁(yè)
文件大?。?/td> 1221K
代理商： MM908E621ACDWB/R2
Analog Integrated Circuit Device Data
Freescale Semiconductor
39
908E621
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 Table 8. Reset clears all HBx_H, HBx_L
bits.
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
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