LTC6946 datasheet(18/30 Pages) LINER

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LTC6946

6946fa

OPERATION

Multiple Byte Transfers

More efficient data transfer of multiple bytes is accom-

plished by using the LTC6946’s register address auto-

increment feature as shown in Figure 12. 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 Addr0+1, Byte 2’s address is Addr0+2, and so

on. If the resister address pointer attempts to increment

past 11 (h0B), it is automatically reset to 0.

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

shown in Figure 13. The first byte of the burst sent from

the serial bus master on SDI contains the destination reg-

ister address (Addr0) and an LSB of “1” indicating a read.

Once the LTC6946 detects a read burst, it takes SDO out

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

A6 A5 A4 A3 A2

7-BIT REGISTER ADDRESS

Hi-Z

MASTER–CS

MASTER–SCLK

MASTER–SDI

LTC6946–SD0

A1 A0 0 D7 D6 D5 D4 D3 D2 D1 D0

8 BITS OF DATA

0 = WRITE

6946 F09

16 CLOCKS

Addr0 + Wr

Hi-Z

MASTER–CS

MASTER–SDI

LTC6946–SDO

Byte 0

Addr1 + Wr

Byte 1

6946 F11

Addr0 + Wr

Hi-Z

MASTER–CS

MASTER–SDI

LTC6946–SDO

Byte 0

Byte 1

Byte 2

6946 F12

Figure 9. Serial Port Write Sequence

Figure 10. Serial Port Read Sequence

Figure 11. Serial Port Single Byte Write

Figure 12. Serial Port Auto-Increment Write

A6 A5 A4 A3 A2

7-BIT REGISTER ADDRESS

Hi-Z

A1 A0 1

D6 D5 D4 D3 D2 D1 D0 DX

8 BITS OF DATA

1 = READ

6946 F10

MASTER–CS

MASTER–SCLK

MASTER–SDI

LTC6946–SDO

16 CLOCKS

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