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LMP90100MHE/NOPB bảng dữ liệu(PDF) 40 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LMP90100/LMP90099/LMP90098/LMP90097 Sensor AFE System: Multi-Channel, Low Power 24-Bit Sensor AFE with True Continuous Background Calibration
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LMP90100MHE/NOPB bảng dữ liệu(HTML) 40 Page - Texas Instruments

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CSB
SCLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
n
INST2
SDI
MSB
LSB
Drdyb = D6
SDO
Data Byte (s)
High-Z
MSB
LSB
LMP90100
SCLK
CSB
SDI
SDO
D6 = DRDYB
uC
SCLK
CSB
MOSI
MISO
Interrupt
LMP90100
SNAS510P – JANUARY 2011 – REVISED MARCH 2013
www.ti.com
DrdybCase3: Routing DRDYB to D6
Figure 58. DrdybCase3 Connection Diagram
The drdyb signal can be routed to pin D6 by setting SPI_DRDYB_D6 high and SDO_DRDYB_DRIVER to 0x4.
This is the behavior for DrdybCase3 as shown in Figure 58.
The timing protocol for this case can be seen in Figure 59. Since DRDYB is separated from SDO, it can be
monitored using the interrupt or polling method. If polled, the drdyb signal needs to be polled faster than tDRDYB to
detect a drdyb assertion. When drdyb asserts, assert CSB to start the SPI transaction and begin writing the
Instruction Bytes (INST1, UAB, INST2) to read from or write to registers.
Figure 59. Timing Protocol for DrdybCase3
Data Only Read Transaction
In a data only read transaction, one can directly access the data byte(s) as soon as the CSB is asserted without
having to send any instruction byte. This is useful as it brings down the latency as well as the overhead
associated with the instruction byte (as well as the Upper Address Byte, if any).
In order to use the data only transaction, the device must be placed in the data first mode. The following table
lists transaction formats for placing the device in and out of the data first mode and reading the mode status.
40
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