LMP90100MHE National Semiconductor, LMP90100MHE Datasheet - Page 33

• 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

DrdybCase1: Combining SDO/DRDYB
As shown in
multiplexed on the same pin as their functions are mostly
complementary. In fact, this is the default mode for the
SDO/DRDYB pin.
Figure 21
case, start by asserting CSB first to monitor a drdyb assertion.
When the drdyb signal asserts, begin writing the Instruction
Bytes (INST1, UAB, INST2) to read from or write to registers.
shows a timing protocol for DrdybCase1. In this
Figure
20, the drdyb signal and SDO can be
FIGURE 20. DrdybCase1 Connection Diagram
FIGURE 21. Timing Protocol for DrdybCase1
33
Note that INST1 and UAB are omitted from the figure below
because this transaction is only required if a new UAB needs
to be implemented.
While the CSB is asserted, DRDYB is driving the
SDO/DRDYB pin unless the device is reading data, in which
case, SDO will be driving the pin. If CSB is deasserted, then
the SDO/DRDYB pin is High-Z. This behavior can be changed
by programming SDO_DRDYB_DRIVER.
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