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参数资料
| 型号： | LMP90079MH/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封装： | LEAD FREE, PLASTIC, MO-153, TSSOP-28 |
| 文件页数： | 31/62页 |
| 文件大小： | 1721K |
| 代理商： | LMP90079MH/NOPB |
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Note that while being in the data first mode, once the data
bytes in the data only read transaction are sent out, the device
is ready to start on any normal (non-data-only) transaction
including the Disable Data First Mode Instruction. The current
status of the data first mode (enabled/disabled status) can be
read back using the Read Mode Status Transaction. This
transaction consists of the Read Mode Status Instruction fol-
lowed by a single data byte (driven by the device). The data
first mode status is available on bit [1] of this data byte.
The data only read transaction allows reading up to eight
consecutive registers, starting from any start address. Usu-
ally, the start address will be the address of the most signifi-
cant byte of conversion data, but it could just as well be any
other address. The start address and number of bytes to be
read during the data only read transaction can be pro-
grammed using the DATA_ONLY_1 AND DATA_ONLY_2
registers respectively.
The upper register address is unaffected by a data only read
transaction. That is, it retains its setting even after encoun-
tering a data only transaction. The data only transaction uses
its own address (including the upper address) from the
DATA_ONLY_1 register. When in the data first mode, the
SCLK must stop high before entering the Data Only Read
Transaction; this transaction should be completed before the
next scheduled DRDYB deassertion.
16.5.8 Cyclic Redundancy Check (CRC)
CRC can be used to ensure integrity of data read from LM-
P900xx. To enable CRC, set EN_CRC high. Once CRC is
enabled, the CRC value is calculated and stored in
SPI_CRC_DAT so that the master device can periodically
read for data comparison. The CRC is automatically reset
when CSB or DRDYB is deasserted.
The CRC polynomial is x8 + x5 + x4 + 1. The reset value of the
SPI_CRC_DAT register is zero, and the final value is ones-
complemented before it is sent out. Note that CRC computa-
tion only includes the bits sent out on SDO and does not
include the bits of the SPI_CRC_DAT itself; thus it is okay to
read SPI_CRC_DAT repeatedly.
The drdyb signal normally deasserts (active high) every 1/
ODR second. However, this behavior can be changed so that
drdyb deassertion can occur after SPI_CRC_DAT is read, but
not later than normal DRDYB deassertion which occurs at
every 1/ODR seconds. This is done by setting bit
DRDYB_AFT_CRC high.
The timing protocol for CRC can be found in Figure 27.
30169759
FIGURE 27. Timing Protocol for Reading SPI_CRC_DAT
If SPI_CRC_DAT read extends beyond the normal DRDYB
deassertion at every 1/ODR seconds, then CRC_RST has to
be set in the SPI Data Ready Bar Control Register. This is
done to avoid a CRC reset at the DRDYB deassertion.Timing
protocol for reading CRC with CRC_RST set is shown in Fig-
30169738
FIGURE 28. Timing Protocol for Reading SPI_CRC_DAT beyond normal DRDYB deassertion at every 1/ODR seconds
37
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LMP90080/LMP90079/LMP90078/LMP90077
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMP90079MHX/NOPB | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| LMP90080 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Sensor AFE System: Multi-Channel, Low-Power 16-Bit |
| LMP90080MH/NOPB | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| LMP90080MHE/NOPB | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| LMP90080MHX/NOPB | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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