LMP90100MHE National Semiconductor, LMP90100MHE Datasheet - Page 34

• Manufacturer Part Number: LMP90100MHE
• Description: AFE, SENSOR, 28TSSOP
• Manufacturer: National Semiconductor

Specifications of LMP90100MHE

• Brief Features: 24bit Low Power Sigma Delta ADC, Automatic Channel Sequencer
• Supply Voltage Range: 2.7V To 5.5V
• Operating Temperature Range: -40°C To +105°C
• Digital Ic Case Style: TSSOP
• No. Of Pins: 28
• Base: RoHS Compliant
• Ic Function: Multi-Channel, Low Power 24-bit Sensor AFE
• Rohs Compliant: Yes

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DrdybCase2: Routing DRDYB to D6
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 DrdybCase2 as shown in
The timing protocol for this case can be seen in
Since DRDYB is separated from SDO, CSB doesn't need to
be asserted in advanced in order to detect a drdyb assertion.
16.5.6 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 in-
struction byte (as well as the Upper Address Byte, if any).
FIGURE 22. DrdybCase2 Connection Diagram
FIGURE 23. Timing Protocol for DrdybCase2
Figure
Figure
22.
23.
34
The drdyb signal can be monitored using the interrupt or
polling method. If polled, the drdyb signal needs to be polled
faster than t
asserts, assert CSB to start the SPI transaction and begin
writing the Instruction Bytes (INST1, UAB, INST2) to read
from or write to registers.
In order to use the data only transaction, the device must be
placed in the data first mode. The following table lists trans-
action formats for placing the device in and out of the data first
mode and reading the mode status.
DRDYB
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to detect a drdyb assertion. When drdyb
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