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33982C 参数 Datasheet PDF下载

33982C图片预览
型号: 33982C
PDF下载: 下载PDF文件 查看货源
内容描述: 单智能大电流自我保护硅高边开关( 2.0毫欧) [Single Intelligent High-current Self-protected Silicon High Side Switch (2.0 mΩ)]
分类和应用: 开关
文件页数/大小: 36 页 / 661 K
品牌: FREESCALE [ Freescale ]
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FUNCTIONAL DEVICE OPERATION  
LOGIC COMMANDS AND REGISTERS  
Address 1110—Under-voltage/Over-voltage Register  
(UOVR)  
A valid message length is determined following a CS  
transition of Logic [0] to Logic [1]. If there is a valid message  
length, the data is latched into the appropriate registers. A  
valid message length is a multiple of eight bits. At this time,  
the SO pin is tri-stated and the fault status register is now  
able to accept new fault status information.  
The UOVR register can be used to disable or enable the  
over-voltage and/or under-voltage protection. By default ([0]),  
both protections are active. When disabled, an under-voltage  
or over-voltage condition fault will not be reported in bits D1  
and D0 of the output fault register.  
The output status register correctly reflects the status of  
the STATR-selected register data at the time the CS is pulled  
to a Logic [0] during SPI communication and/or for the period  
of time since the last valid SPI communication, with the  
following exceptions:  
Address x111—TEST  
The TEST register is reserved for test and is not  
accessible with SPI during normal operation.  
• The previous SPI communication was determined to be  
invalid. In this case, the status will be reported as  
though the invalid SPI communication never occurred.  
• Battery transients below 6.0 V resulting in an under-  
voltage shutdown of the outputs may result in incorrect  
data loaded into the status register. The SO data  
transmitted to the MCU during the first SPI  
SERIAL OUTPUT COMMUNICATION (DEVICE  
STATUS RETURN DATA)  
When the CS pin is pulled low, the output status register is  
loaded. Meanwhile, the data is clocked out MSB- (OD7-) first  
as the new message data is clocked into the SI pin. The first  
eight bits of data clocking out of the SO, and following a CS  
transition, are dependant upon the previously written SPI  
word.  
communication following an under-voltage VPWR  
condition should be ignored.  
• The RST pin transition from a Logic [0] to Logic [1] while  
the WAKE pin is at Logic [0] may result in incorrect data  
loaded into the status register. The SO data transmitted  
to the MCU during the first SPI communication following  
this condition should be ignored.  
Any bits clocked out of the SO pin after the first eight will  
be representative of the initial message bits clocked into the  
SI pin since the CS pin first transitioned to a Logic [0]. This  
feature is useful for daisy chaining devices as well as  
message verification.  
Table 16. Serial Output Bit Map Descriptions  
Previous STATR  
D7, D2, D1, D0  
Serial Output Returned Data  
SOA3 SOA2 SOA1 SOA0  
OD7  
WDin  
WDin  
WDin  
WDin  
WDin  
0
OD6  
OD5  
OD4  
OD3  
OD2  
UVF  
OD1  
OVF  
OD0  
FAULT  
IN_SPI  
SOCL0  
OCLT0  
A/O  
x
x
x
x
x
0
1
0
1
x
0
0
0
0
1
1
1
1
1
1
0
0
1
1
0
0
0
1
1
1
0
1
0
1
0
1
1
0
0
1
OTF  
0
OCHF  
OCLF  
OLF  
0
1
1
0
0
0
1
1
1
0
1
0
1
1
0
0
0
SOCH  
OL_dis  
Fast SR  
FSM_HS  
0
0
CSNS EN  
SOCL1  
OCLT1  
IN dis  
OSD1  
WD1  
0
SOCL2  
CD_dis  
CSNS high  
OSD2  
WDTO  
IN Pin  
1110  
0
1
1
OSD0  
WD0  
1
1
0
1
0
FSI Pin  
UV_dis  
WAKE Pin  
OV_dis  
1
1
0
WDin  
See Table 1  
x = Don’t care.  
Previous Address SOA[2:0]=000  
SERIAL OUTPUT BIT ASSIGNMENT  
The eight bits of serial output data depend on the previous  
serial input message, as explained in the following  
If the previous three MSBs are 000, bits OD6:OD0 reflect  
the current state of the Fault register (FLTR) (Table 17).  
paragraphs. Table 16 summarizes the SO register content.  
Previous Address SOA[2:0]=001  
Bit OD7 reflects the state of the watchdog bit (D7)  
addressed during the prior communication. The contents of  
bits OD6:OD0 depend upon the bits D2:D0 from the most  
recent STATR command SOA2:SOA0.  
The data in bits OD1 and OD0 contain CSNS EN and  
IN_SPI programmed bits, respectively.  
33982  
Analog Integrated Circuit Device Data  
Freescale Semiconductor  
26