LTC6952 datasheet(32/80 Pages) AD

32 / 80 page

LTC6952

6952f

For more information www.analog.com

Preliminary Technical Data

Advance Product Information Subject to Change

Rev PrA

OPERATION

Multiple Byte Transfers

More efficient data transfer of multiple bytes is accom-

plished by using the LTC6952’s register address auto-

increment feature as shown in Figure 21. The serial port

master sends the destination register address in the first

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

sending bytes destined for subsequent registers. Byte 1’s

address is ADDRX+1, Byte 2’s address is ADDRX+2, and

so on. If the register address pointer attempts to increment

past 56 (h38), it is automatically reset to 0.

An example of an auto-increment read from the part is

shown in Figure 22. The first byte of the burst sent from

the serial bus master on SDI contains the destination

read. Once the LTC6952 detects a read burst, it takes SDO

out of the Hi-Z condition and sends data bytes sequentially,

beginning with data from register ADDRX. The part ignores

all other data on SDI until the end of the burst.

ADDRX + Wr

Hi-Z

MASTER–CS

MASTER–SDI

LTC6952 –SDO

BYTE X

ADDRY + Wr

BYTE Y

6952 F20

ADDRX + Wr

Hi-Z

MASTER–CS

MASTER–SDI

LTC6952–SDO

BYTE X

BYTE X + 1

BYTE X + 2

6952 F21

ADDRX + Rd

DON’T CARE

Hi-Z

MASTER–CS

MASTER–SDI

LTC6952–SDO

6952 F22

BYTE X

BYTE X + 1

BYTE X + 2

Figure 20. Serial Port Single Byte Writes

Figure 21. Serial Port Auto-Increment Write

Figure 22. Serial Port Auto-Increment Read

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