參數(shù)資料
型號(hào)： MM908E621ACDWB/R2
廠商： FREESCALE SEMICONDUCTOR INC
元件分類(lèi)： 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)： 35/65頁(yè)
文件大?。?/td> 1221K
代理商： MM908E621ACDWB/R2
Analog Integrated Circuit Device Data
40
Freescale Semiconductor
908E621
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Table 8. 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.
If the incoming signal is low, the high side MOSFET is
switched off.
With the current recirculation mode control bit CRM in the
Half-bridge Status and Control Register (HBSCTL), the
recirculation behavior in PWM mode can be controlled. If
CRM is set, the corresponding low side MOSFET is switched
on, if the PWM controlled high side MOSFET is off.
Half-bridge Current Recopy
Each low side MOSFET has an additional sense output to
allow a current recopy feature. These sense sources are
internally amplified and switched to the Analog Multiplexer.
The factor for the Current Sense amplification can be
selected via the CSA bit in the A0MUCTL register (see
CSA = “1”: low resolution selected
CSA = “0”: high resolution selected
Half-bridge Over-temperature Protection
The outputs are protected against over-temperature
conditions. Each power output comprises two different
temperature thresholds.
The first threshold is the high temperature interrupt (HTI).
If the temperature reaches this threshold, the HTIF bit in the
Interrupt Flag Register (IFR) is set, and an interrupt will be
initiated if the HTIE bit in the Interrupt Mask register is set. In
addition, this interrupt can be used to automatically turn off
the power stages. This shutdown can be enabled/disabled by
the HTIS0-1 Bits in the System Control Register (SYSCTL).
The high temperature interrupts flag (HTIF) is cleared (and
the outputs reenabled) by writing a “1” to the HTIF flag in the
Interrupt Flag Register (IFR) or by a reset. Clearing this flag
has no effect as long as a high temperature condition is
present.
If the HTI shutdown is disabled, a second threshold high
temperature reset (HTR) will be used to turn off all power
stages (HB (all Fet’s), HS, HVDD, H0) in order to protect the
device.
Half-Bridge Over-current Protection
The Half-bridges are protected against short to GND,
VSUP, and load shorts. The over-current protection is
implemented on each HB. If an over-current condition on the
high side MOSFET occurs, the high side MOSFET is
automatically switched off. An over-current condition on the
low side MOSFET will automatically turn off the low side
MOSFET. In both cases, the corresponding HBxOCF flag in
the Half-bridge Status and Control Register (HBSCTL) is set.
The over-current status flag is cleared (and the
corresponding half-bridge MOSFETs reenabled) by writing a
“1” to the HBxOCF in the Half-bridge Status and Control
Register (HBSCTL) or by a reset.
Half-bridge Over-voltage/Under-voltage Protection
The half-bridge outputs are protected against under-
voltage and over-voltage conditions. This protection is done
by the low and high voltage interrupt circuitry. If one of these
flags (LVIF, HVIF) are set, the outputs are automatically
disabled when the VIS bit in the System Control Register
(SYSCTL) is cleared.
The over-voltage and under-voltage status flags are
cleared (and the outputs reenabled) by writing a “1” to the
LVIF / HVIF flags in the Interrupt Flag Register (IFR), or by a
reset. Clearing this flag has no effect as long as the high
voltage or low voltage condition is still present.
Half-bridge Status and Control Register (HBSCTL)
CRM — Current Recirculation Mode bit
This read/write bit selects the recirculation mode during
PWM. Reset clears the CRM bit.
1 = recirculation via switched on low side MOSFET
0 = recirculation via low side free wheeling diode
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
Register Name and Address: HBSCTL - $03
Bit7
6
5
4
3
2
1
Bit0
Read
CRM
0
HB4
OCF
HB3
OCF
HB2
OCF
HB1
OCF
Write
Reset
0
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