LTC6953 datasheet(24/56 Pages) AD

24 / 56 page

LTC6953

Rev 0

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Preliminary Technical Data

Advance Product Information Subject to Change

Rev PrA

The 7 most significant bits of the first byte are the register

address, with an LSB of “1” indicating a read from the

part, and LSB of “0” indicating a write to the part. The sub-

sequent byte or bytes, is data from/to the specified reg-

ister address. See Figure 13 for an example of a detailed

write sequence and Figure 14 for a read sequence.

Figure 15 shows an example of two write communica-

tion bursts. The first byte of the first burst sent from the

serial bus master on SDI contains the destination reg-

ister address (ADDRX) and an LSB of “0” indicating a

write. The next byte is the data intended for the register

at address ADDRX. CS is then taken high to terminate the

Figure 13. Serial Port Write Sequence

Figure 14. Serial Port Read Sequence

transfer. The first byte of the second burst contains the

destination register address (ADDRY) and an LSB indicat-

ing a write. The next byte on SDI is the data intended for

the register at address ADDRY. CS is then taken high to

terminate the transfer.

Multiple Byte Transfers

More efficient data transfer of multiple bytes is accom-

plished by using the LTC6953’s register address auto-

increment feature as shown in Figure 16. The serial port

master sends the destination register address in the

first byte and its data in the second byte as before, but

A6 A5 A4 A3 A2

7-BIT REGISTER ADDRESS

Hi-Z

MASTER–CS

MASTER–SCLK

MASTER–SDI

LTC6953–SD0

A1 A0

0 D7 D6 D5 D4 D3 D2 D1 D0

8 BITS OF DATA

0 = WRITE

6953 F13

16 CLOCKS

A6 A5 A4 A3 A2

7-BIT REGISTER ADDRESS

Hi-Z

A1 A0

D6 D5 D4 D3 D2 D1 D0 DX

8 BITS OF DATA

1 = READ

6953 F14

MASTER–CS

MASTER–SCLK

MASTER–SDI

LTC6953–SDO

16 CLOCKS

ADDRX + Wr

Hi-Z

MASTER–CS

MASTER–SDI

LTC6953–SDO

BYTE X

ADDRY + Wr

BYTE Y

6953 F15

Figure 15. Serial Port Single Byte Writes

OPERATION

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