收藏本站
FUNCTIONAL DEVICE OPERATION
INITIALIZATION REQUIREMENTS
RECOVERY FROM STANDBY MODE OR A FAULT
When the 33937A is placed in Standby Mode or a fault
condition causes a shutdown, the Gate outputs are all driven
low. The High Side gate drive is then disabled and locked to
prevent unauthorized transitions. This requires an
initialization sequence to recover normal operation at the end
of this mode of operation. The initialization sequence is
nearly identical to recovery from Sleep mode, with the
modification that the initial pulse to the Low Side Control
inputs can be reduced to a 100 ns pulse (the Low Side Gates
may not actually change state). Then the initialization is
completed by cycling the High Side Gates to re-engage the
gate drive and insure that it is in the proper state prior to
resuming normal operation.
Note the inputs PA_LS, PB_LS, PC_LS, nPA_HS,
nPB_HS and nPC_HS are edge sensitive. Toggling the LS
inputs enables the HS drivers, so for the HS drivers to be
initialized correctly the edge of the input signal to the HS
drivers must come after the LS input toggle. A failure to do
this will result in the HS gate output remaining locked out from
input control. The initial LS input transition from low to high
needs to be after both ENABLE inputs are high (the device in
NORMAL mode) for the same reason. The delay between
ENABLE and the LS input should be 280 ns minimum to
insure the device is out of STBY mode.
INT
A valid initialization sequence would go something like
this:
1. SPI command to clear all interrupt conditions
2. ENABLE1 and ENABLE2 are set HIGH (LS outputs are
now enabled)
SPI
nCS
Px_Combined
Clear
0.1 μ s
3. PA_LS, PB_LS and PC_LS are toggled HIGH for at
least 100 ns (HS Gate Drive outputs are enabled)
longer if bootstrap capacitors need charged.
4. Toggle nPA_HS, nPB_HS and nPC_HS LOW for
DEAD TIME plus at least 100 ns.
End of initialization.
Doing step 4 simultaneously on all HS inputs will place the
motor into HIGH Side Recirculation mode and will not cause
motion during the time they are ON.
This action will restore the High Side gate drive operation
and leave it with the HS_G shorted to HS_S on all phases.
The HS output FETs will be OFF and ready for normal motor
control.
Step 3 and step 4 can be done on all the stated inputs
simultaneously. In fact it is desirable for the HS (step 4) to be
toggled simultaneously to prevent current from flowing in the
nPx_HS
0.1 μ s
Px_LS
EN2
EN1
Figure 21. Recovery Initialization
The horizontal divisions are not to scale, they are a
reference to show the sequence of operation. Either
individual nPx_HS and Px_LS or nPx_Combined may be
used. nPx_Combined is defined as both nPx_HS and Px_LS
tied together or operated to the same logic level
simultaneously.
motor during initialization.
33937A
Analog Integrated Circuit Device Data
Freescale Semiconductor
39
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
MDN2BL3GRAS MOTOR BRUSHED DC 2V 2753RPM
MDN3BL3CSAS MOTOR BRUSHED DC 2V 1458RPM
MIC2287-34YML TR IC LED DRIVER WHITE BCKLGT 8-MLF
MIC2289C-34YD6 TR IC LED DRIVR WHITE BCKLGT TSOT-6
MIC2291YD5 TR IC LED DRIVER PHOTO FLASH TSOT-5
MIC2293-15YML TR IC LED DRIVER WHITE BCKLGT 8-MLF
MIC2293C-34YML TR IC LED DRIVER WHITE BCKLGT 8-MLF
MIC2297-42YML TR IC LED DRIVR WHITE BCKLGT 10-MLF
相关代理商/技术参数
MCZ33970EG 功能描述:马达/运动/点火控制器和驱动器 DUAL GAGE DRVR IMP DAMP RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube
MCZ33970EG 制造商:Freescale Semiconductor 功能描述:IC STEPPER MOTOR GAUGE DRIVER SPI
MCZ33970EGR2 功能描述:马达/运动/点火控制器和驱动器 DUAL GAGE DRVR IMP DAMP RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube
MCZ33972AEK 功能描述:接口 - 专用 MULT SW DET SUP-WKUP RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59
MCZ33972AEK/R2 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Multiple Switch Detection Interface with Suppressed Wake-up
MCZ33972AEKR2 功能描述:接口 - 专用 MULT SW DET SUP-WKUP RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59
MCZ33972AEW 功能描述:接口 - 专用 MULT SW DET SUPRESS WU RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59
MCZ33972AEW/R2 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Multiple Switch Detection Interface with Suppressed Wake-up