LTC6948IUFD-2TRPBF View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC6948IUFD-2TRPBF
Linear Technology
'LTC6948IUFD-2TRPBF' PDF : 36 Pages View PDF
LTC6948
Operation
the rising edge of SCLK, with all transfers MSB first. The
communication burst is terminated by the serial bus master
returning CS high. See Figure 6 for details.
Data is read from the part during a communication burst
using SDO. Readback may be multidrop (more than one
LTC6948 connected in parallel on the serial bus), as SDO
is three-stated (Hi-Z) when CS = 1, or when data is not
being read from the part. If the LTC6948 is not used in
a multidrop configuration, or if the serial port master is
not capable of setting the SDO line level between read
sequences, it is recommended to attach a high value
resistor of greater than 200k between SDO and GND to
ensure the line returns to a known level during Hi-Z states.
See Figure 7 for details.
Single Byte Transfers
The serial port is arranged as a simple memory map, with
status and control available in 15 byte-wide registers. All
data bursts are comprised of at least two bytes. The seven
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 subsequent byte,
or bytes, is data from/to the specified register address.
See Figure 8 for an example of a detailed write sequence,
and Figure 9 for a read sequence.
Figure 10 shows an example of two write communication
bursts. The first byte of the first burst sent from the serial
bus master on SDI contains the destination register ad-
MASTER–CS
MASTER–SCLK
MASTER–SDI
tCSS
tCKL
tCKH
tCS
tCH
DATA
DATA
Figure 6. Serial Port Write Timing Diagram
tCSS
tCSH
6948 F06
MASTER–CS
MASTER–SCLK
Hi-Z
LTC6948–SDO
8TH CLOCK
tDO
tDO
tDO
tDO
DATA
DATA
Figure 7. Serial Port Read Timing Diagram
Hi-Z
6948 F07
MASTER–CS
MASTER–SCLK
16 CLOCKS
7-BIT REGISTER ADDRESS
8 BITS OF DATA
MASTER–SDI
LTC6948–SD0
A6 A5 A4 A3 A2 A1 A0 0 D7 D6 D5 D4 D3 D2 D1 D0
Hi-Z
0 = WRITE
6948 F08
Figure 8. Serial Port Write Sequence
For more information www.linear.com/LTC6948
6948f
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