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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： | 26/62页 |
| 文件大小： | 1721K |
| 代理商： | LMP90079MH/NOPB |
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16.5 SERIAL DIGITAL INTERFACE
A synchronous 4-wire serial peripheral interface (SPI) pro-
vides access to the internal registers of LMP900xx via CSB,
SCLK, SDI, SDO/DRDYB.
16.5.1 Register Address (ADDR)
All registers are memory-mapped. A register address (ADDR)
is composed of an upper register address (URA) and lower
register address (LRA) as shown in ADDR Map. For example,
ADDR 0x3A has URA=0x3 and LRA=0xA.
ADDR Map
Bit
[6:4]
[3:0]
Name
URA
LRA
16.5.2 Register Read/Write Protocol
Figure 19 shows the protocol how to write to or read from a
register.
Transaction 1 sets up the upper register address (URA)
where the user wants to start the register-write or register-
read.
Transaction 2 sets the lower register address (LRA) and in-
cludes the Data Byte(s), which contains the incoming data
from the master or outgoing data from the LMP900xx.
Examples of register-reads or register-writes can be found in
30169736
FIGURE 19. Register Read/Write Protocol
16.5.3 Streaming
When writing/reading 3+ bytes, the user must operate the de-
vice in Normal Streaming mode or Controlled Streaming
mode. In the Normal Streaming mode, which is the default
mode, data runs continuously starting from ADDR until CSB
deasserts. This mode is especially useful when programming
all the configuration registers in a single transaction. See
Section 17.5.1 Normal Streaming Example for an example of
the Normal Streaming mode.
In the Controlled Streaming mode, data runs continuously
starting from ADDR until the data has run through all
(STRM_RANGE + 1) registers. For example, if the starting
ADDR is 0x1C, STRM_RANGE = 5, then data will be written
to or read from the following ADDRs: 0x1C, 0x1D, 0x1E,
0x1F, 0x20, 0x21. Once the data reaches ADDR 0x21, LM-
P900xx will wrap back to ADDR 0x1C and repeat this process
until CSB deasserts. See Section 17.5.2 Controlled Stream-
ing Example for an example of the Controlled Streaming
mode.
If streaming reaches ADDR 0x7F, then it will wrap back to
ADDR 0x00. Furthermore, reading back the Upper Register
Address after streaming will report the Upper Register Ad-
dress at the start of streaming, not the Upper Register Ad-
dress at the end of streaming.
To stream, write 0x3 to INST2’s SZ bits as seen in Figure
19. To select the stream type, program the SPI_STREAMCN:
STRM_TYPE bit. The STRM_RANGE can also be pro-
grammed in the same register.
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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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