7

1

16

Read Data

Register Address

Read

Command

CS

CLK

DI

9

D7

D6

D5

D4

D3

D2

D1

D0

DO

1

0

A4

A3

A2

A1

A0

1

2

3

7

1

16

Register Address

Write

Command

CS

CLK

DI

9

DO

0

0

A4

A3

A2

A1

A0

1

2

3

0

D7

D6

D5

D4

D3

D2

D1

D0

Write Data

LM10502

www.ti.com

SNVS884B – AUGUST 2012 – REVISED MAY 2013

SPI DATA INTERFACE

The device is programmable via 4-wire SPI Interface. The signals associated with this interface are CS, DI, DO

and CLK. Through this interface, the user can enable/disable the device, program the output voltages of the

individual Bucks and of course read the status of Flag registers.

By accessing the registers in the device through this interface, the user can get access and control the operation

of the buck controllers and program the reference voltage of the comparator in the device.

Figure 19. SPI Interface Write

•

Data In (DI)

–

1 to 0 Write Command

–

A4to A0 Register address to be written

–

D7 to D0 Data to be written

•

Data Out (DO)

–

All Os

Figure 20. SPI Interface Read

•

Data In (DI)

–

1 to 1 Read Command

–

A4to A0 Register address to be read

•

Data Out (DO)

–

D7 to D0 Data Read

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