DRV8461SPWPR datasheet(68/117 Pages) TI

68 / 117 page

• For a write command, the existing data in the register being written to is shifted out on the SDO pin following

the 8-bit command data.

The SDI input data word is 16 bits long and consists of the following format, as shown in Table 7-31:

• Command byte (first 8 bits)

– MSB bit indicates frame type (bit B15 = 0 for standard frame).

– Next to MSB bit, W0, indicates read or write operation (bit B14, write = 0, read = 1)

– Followed by 6 address bits, A[5:0] (bits B13 through B8)

• Data byte (last 8 bits)

– Last 8 bits indicate data, D[7:0] (bits B7 through B0). For a read operation, these bits are typically set to

null values, while for a write operation, these bits have the data value for the addressed register.

Table 7-31. SDI - Standard Frame Format

R/W

ADDRESS

DATA

B15

B14

B13

B12

B11

B10

The SDO output data word is 16 bits long and consists of the following format, as shown in Table 7-32:

• Status byte (first 8 bits)

– 2 MSB bits are forced high (B15, B14 = 1).

– Following 6 bits are from the FAULT register (bits B13 through B8)

• Report byte (last 8 bits)

– The last 8 bits (B7:B0) are either the data currently in the register being read for a read operation (W0 =1),

or, existing data in the register being written to for a write command (W0 = 0).

Table 7-32. SDO Output Data Word Format

STATUS

REPORT

B15

B14

B13

B12

B11

B10

UVLO

CPUV

OCP

STL

7.4.1.2 SPI for Multiple Target Devices in Daisy Chain Configuration

Multiple devices can be connected to the controller with and without the daisy chain. For connecting a 'n' number

of devices to a controller without using a daisy chain, 'n' number of GPIO resources from controller have to be

utilized for nSCS pins. Whereas, if the daisy chain configuration is used, a single nSCS line can be used for

connecting multiple devices.

Figure 7-49 shows the topology when three devices are connected in daisy chain. This configuration saves

GPIO ports when multiple devices are communicating to the same controller.

Commander

DRV8461 (1)

DRV8461 (2)

DRV8461 (3)

SDI1

SDO1 / SDI2

SDO2 / SDI3

SDO3

M-SDO

M-nSCS

M-SCLK

M-SDI

Figure 7-49. Three Devices Connected in Daisy Chain

DRV8461

SLOSE98 – DECEMBER 2022

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