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参数资料
| 型号： | MCZ33784EF |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 8/30页 |
| 文件大小： | 0K |
| 描述： | IC SENSOR DBUS DSI 2.02 16-SOIC |
| 标准包装： | 48 |
| 类型： | 传感器接口 |
| 输入类型： | 模拟 |
| 输出类型： | 数字 |
| 接口： | 总线 |
| 电流 - 电源： | 4mA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC N |
| 包装： | 管件 |
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Analog Integrated Circuit Device Data
16
Freescale Semiconductor
33784
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
In case there is a bus error (due to induced noise or a bus
fault), both the master and slave devices will likely read bad
data. The slave reacts to bad data by not sending a response
during the next frame, and clears the any pending response.
The master will detect a CRC error (if enabled) once it
receives the corrupted data sent by the slave, and once again
when the slave fails to respond. This is illustrated in Figure 8.
When this error occurs, the system software needs to
acknowledge this condition and resend a command of the
same size so that it can receive the proper response.
Failure to take corrective action will result in unintended
errors as shown in Figure 8. In this case, the master will miss
Responses N and N+1.
Figure 8. Bus Traffic With Receive Error and Recovery
STANDARD DBUS COMMAND STRUCTURE
Two word sizes are available for standard DBUS
commands. These are termed “long word” and “short word”.
A standard long word always consists of 8 data bits,
4 address bits, 4 command bits, and 4 cyclic redundancy
check (CRC) bits. The data bits are always sent first, starting
with the MSB, and are followed by the address bits, then the
command bits, and ending with the CRC bits. Refer to
A standard short word consists of 4 address bits,
4 command bits, and 4 CRC bits. The address bits are
always sent first, starting with the MSB, followed by the
command bits, and ending with the CRC bits. This is also
shown in Table 7.
Some commands can be sent in either standard long word
or standard short word format as desired. If these commands
are sent in long word format, the data bits are “don’t-care” for
the 33784, but should all be set to 0 to maintain future
compatibility.
When a standard long word or short word is sent on the
bus, the 33784 will calculate a CRC as each bit is received.
The CRC is calculated using the polynomial X4+1 and seed
1010. The polynomial and seed cannot be changed when
communicating in standard mode. At the conclusion of the
transmission, the 33784 will compare the calculated CRC
with the CRC included within the message. If the two match,
the message is considered valid and the 33784 will act on the
message accordingly. If the calculated CRC does not match
the CRC included within the message, the 33784 will ignore
the transmission and the message will be discarded.
ENHANCED DBUS COMMAND STRUCTURE
In addition to standard DBUS commands, the 33784 can
accept enhanced DBUS commands. Like standard
commands, there are two word sizes available for enhanced
commands. These, like the standard long word, are termed
“enhanced long word” and “enhanced short word”. An
enhanced long word always consists of 8 data bits, 4 address
bits, 4 command bits, and 4 CRC bits. The data bits are
always sent first, starting with the MSB, and are followed by
the address bits, then the command bits, and ending with the
CRC bits. Refer to Table 7.
However, an enhanced long word differs from a standard
long word in that the CRC polynomial and seed are not fixed
and can be programmed into the IC via the bus. The method
of programming the polynomial and seed is discussed in
Likewise, enhanced short words will also use the
polynomial and seed that have been programmed into the IC.
Enhanced short words consist of 0 or 2 data bits, 4 address
bits, 4 command bits, and 4 CRC bits. The data bits (if any)
are sent first, followed by the address bits, followed by the
command bits, and ending with the CRC bits. This is shown
in Table 7. The optional data bits are only place holders and
are used so that longer responses can be transmitted. If the
optional data bits are used, they are “don’t-care” for the
33784, but should both be set to 0 to maintain future
compatibility.
Some commands can be sent in either enhanced long
word or enhanced short word format as desired. If these
commands are sent in enhanced long word format, the data
bits are “don’t-care” for the 33784, but should all be set to 0
to maintain future compatibility.
Command N
Bus Error
Command N+1
Command N+2
Response N-1
Response N
No Response
Response N+2
Command N+3
Command N+4
Response N+3
CRC
Error
CRC
Error
CRC
Master
Slave
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCZ33784EF/R2- | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:DSI 2.02 Sensor Interface |
| MCZ33784EFR2 | 功能描述:加速计 - 板上安装 DBUS2 SENSOR INTERFACE RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C |
| MCZ33789AE | 功能描述:网络控制器与处理器 IC Airbag ASSP RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| MCZ33789AE/R2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Airbag System Basis Chip (SBC) with Power Supply and PSI5 Sensor Interface |
| MCZ33789AER2 | 功能描述:网络控制器与处理器 IC Airbag ASSP RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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