SA3

SA2

SA1

SA0

0

1

1

A4

A3

A2

A1

A0

P

SCLK

SDATA

SCLK

A

A

D1

D0

P

D2

D5

D4

D3

D6

D7

0

SDATA

For reference only.

Signal driven by Slave.

Signal not driven; pulldown only.

Signal driven by Master.

P

0

Bus

Park

Bus

Park

SSC

Register Read Command Frame

Data Frame (from Slave)

SA3

SA2

SA1

SA0

0

1

0

A4

A3

A2

A1

A0

P

Register Write Command Frame

SCLK

SDATA

SCLK

SSC

A

A

Signal driven by Master.

For reference only.

Signal not driven; pull-down only.

D1

D0

P

D2

D5

D4

D3

D6

P

D7

0

Data Frame

SDATA

Bus

Park

LM3263

SNVS837 – JUNE 2013

www.ti.com

Figure 24. Register Write

Figure 25. Register Read

Device Enumeration

The interface component recognizes broadcast Slave Address (SID) of 0000b and is configured, via internal

interface signals, with a Unique SID address (USID) and a Group SID address (GSID). The USID is set to 0100b

and GSID set to 0000b. The register-set component will typically set the USID to a fixed value; however, it is also

possible to select a second pre-set USID if a second LM3263 is needed on the board. This second User ID can

be set by forcing a voltage > 1.36V at the GPO1 pin for USID = 0101b. Please refer to GPO1 for detailed usage

and programmability of the USID. The USID can also be re-programmed via the standard protocol for

programming the RFFE as defined in the RFFE spec. The USID should not be programmed to the reserved

broadcast slave id of 0000b. A value of 0000b will be ignored by the device.

18

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