OPERATIONAL MODES CRM — Current Recirculat" />
參數(shù)資料
型號: MM908E622ACDWB
廠商: Freescale Semiconductor
文件頁數(shù): 33/63頁
文件大?。?/td> 0K
描述: IC QUAD HALF BRDG TRPL SW 54SOIC
標準包裝: 26
應用: 自動鏡像控制
核心處理器: HC08
程序存儲器類型: 閃存(16 kB)
控制器系列: 908E
RAM 容量: 512 x 8
接口: SCI,SPI
輸入/輸出數(shù): 12
電源電壓: 9 V ~ 16 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 54-BSSOP(0.295",7.50mm 寬)裸露焊盤
包裝: 管件
供應商設備封裝: 54-SOICW-EP
Analog Integrated Circuit Device Data
Freescale Semiconductor
39
908E622
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
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
HBxOCF — Half-bridges Over-current Flag Bit
This read/write bit indicates that an over-current condition
on either the LS or the HS FET on HBx has occurred.
Clear HBxOCF and enable Half-bridge by writing a logic
[1] to HBxOCF. Writing a logic [0] to HBxOCF has no effect.
Reset clears the HBxOCF bit.
1 = over-current condition on HBx occurred
0 = no over-current condition on HBx
High Side Drivers
The high side outputs are low resistive high side switches
targeted for driving lamps. The high sides are protected
against over-temperature, over-current and over-voltage/
under-voltage.
Figure 23. HS Circuitry
HIGH SIDE OPERATING MODES
The high sides outputs are enabled if the PSON bit in the
System Control Register (SYSCTL) is set.
Each high side output is permanently switched on, if the
HSxON bit in the High Side Output Register (HSOUT) is set.
PWM control of the output is enabled, if the HSxPWM bit
High Side Output Register (HSOUT) is set. In this operating
mode, the high side MOSFET is on, if the input PWM signal
(PWM pin) is high.
Table shows the behavior of the high side MOSFETs
depending on the HSONx and PWMHSx bits.
VSUP
HSx
HS - Driver
charge pump
over-current protection
inrush current limiter
PWM
Control
on/off
Current
Limit
Status
PSON
HSxON
HSxPWM
PWM
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