AWR1642 datasheet(21/75 Pages) TI1

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7.6.5 System Topologies

The following the system topologies are supported.

• Topology 1: Peripheral Mode, under the control of external MCU

• Topology 2: Autonomous mode, with connection to a remote host via LIN/CAN

Figure 7-1. System Topologies

In Topology 1: Peripheral mode, the AWRL6432 is controlled by external MCU and most of the processing is

done on external MCU. In this case, the computational and power requirements are relatively higher and the

external MCU can stay active most of the time.

In Topology 2: Autonomous mode, the AWRL6432 can be used as full sensor along with M4F application

processor. In this case the internal application processor does all the processing and interrupts the host

processor to communicate to take action based on the sensor data. Most of the processing happens on the

internal MCU of the AWRL6432 chip and only high level desired results are communicated to external host via

LIN/CAN.

7.6.5.1 Power Topologies

The device supports two unique power topologies for BOM optimized and Power Optimized modes. Above

tables from Section 7.6.1 to Section 7.6.4 summarize these options. Based on whether the 1.2V rail is generated

internally or is provided from external source, two power topologies comes into account.

In BOM optimized mode the device can be powered up using one rail (1.8V) or two rails (3.3V and a 1.8V)

provided externally. The 1.2V rail is internally generated in BOM optimized topology.

In power optimized mode, the device can either be powered using two rails (1.8V and 1.2V) or with three rails

(3.3V, 1.8V and 1.2V), all provided externally. The 1.2V rail is NOT internally generated in Power optimized

topology. The device senses the external 1.2V supply and decides which topology the device will operate on.

7.6.5.1.1 BOM Optimized Mode

In this mode the device can be powered using one 1.8V regulator OR using a 3.3V and a 1.8V regulator mode.

The choice of one rail vs two rails is dependent on the IO voltages needed.

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AWRL6432

SWRS295A – DECEMBER 2022 – REVISED MARCH 2024

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AWR1642 Datasheet(PDF) 21 Page - Texas Instruments