LTC6948IUFD-4PBF View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC6948IUFD-4PBF
Linear Technology
'LTC6948IUFD-4PBF' PDF : 36 Pages View PDF
LTC6948
Operation
dress (Addr0) and an LSB of 0 indicating a write. The next
byte is the data intended for the register at address Addr0.
CS is then taken high to terminate the transfer. The first
byte of the second burst contains the destination register
address (Addr1) and an LSB indicating a write. The next
byte on SDI is the data intended for the register at address
Addr1. 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 LTC6948’s register address auto-
increment feature as shown in Figure 11. 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 register address pointer attempts to increment
past 14 (h0E), it is automatically reset to 0.
An example of an auto-increment read from the part is
shown in Figure 12. 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 LTC6948 detects a read burst, it takes SDO out
of the Hi-Z condition and sends data bytes sequentially,
beginning with data from register Addr0. The part ignores
all other data on SDI until the end of the burst.
MASTER–CS
MASTER–SCLK
16 CLOCKS
7-BIT REGISTER ADDRESS
MASTER–SDI A6 A5 A4 A3 A2 A1 A0 1
1 = READ
Hi-Z
LTC6948–SDO
8 BITS OF DATA
X D7 D6 D5 D4 D3 D2 D1 D0 DX Hi-Z
6948 F09
Figure 9. Serial Port Read Sequence
MASTER–CS
MASTER–SDI
ADDR0 + Wr
BYTE 0
ADDR1 + Wr
BYTE 1
Hi-Z
LTC6948–SDO
6948 F10
Figure 10. Serial Port Single Byte Write
22
MASTER–CS
MASTER–SDI
ADDR0 + Wr
BYTE 0
BYTE 1
BYTE 2
Hi-Z
LTC6948–SDO
6948 F11
Figure 11. Serial Port Auto-Increment Write
MASTER–CS
MASTER–SDI
ADDR0 + Rd
DON’T CARE
Hi-Z
LTC6948–SDO
BYTE 0
BYTE 1
BYTE 2
Hi-Z
6948 F12
Figure 12. Serial Port Auto-Increment Read
For more information www.linear.com/LTC6948
6948f
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