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LTC3220/LTC3220-1
OPERATION
sub-address register is then written to, followed by the
data register. Each data register has a sub-address. After
the data register has been written a load pulse is created
after the stop bit. The load pulse transfers all of the data
held in the data registers to the DAC registers. The stop
bit can be delayed until all of the data master registers
have been written. At this point the LED current will be
changed to the new settings. The serial port uses static
logic registers so there is no minimum speed at which it
can be operated.
when the bus is not in use. External pull-up resistors or
current sources, such as the LTC1694 SMBus accelerator,
are required on these lines.
The LTC3220/LTC3220-1 are receive-only (slave) devices.
There are two I 2 C addresses available. The LTC3220 I 2 C
address is 0011100 and the LTC3220-1 I 2 C address is
0011101. The I 2 C address is the only difference between
the LTC3220 and LTC3220-1.
Write Word Protocol Used By the LTC3220/LTC3220-1
I 2 C Interface
1
7
1
1
8
1
8
1
1
The LTC3220/LTC3220-1 communicate with a host (master)
using the standard I 2 C 2-wire interface. The Timing Diagram
S Slave Address Wr A *Sub-Address A Data Byte
S = Start Condition, Wr = Write Bit = 0, A = Acknowledge,
A
P**
(Figure 3) shows the timing relationship of the signals on
the bus. The two bus lines, SDA and SCL, must be high
SUB-ADDRESS
P = Stop Condition
*The sub-address uses only the ?rst 5 bits, D0, D1, D2, D3 and D4.
**Stop can be delayed until all of the data registers have been written.
DATA BYTE
LTC3220
ADDRESS
WR
0
0
1
1
1
0
0
0
S7
S6
S5
S4
S3
S2
S1
S0
7
6
5
4
3
2
1
0
LTC3220-1
ADDRESS
WR
0
0
1
1
1
0
1
0
START
STOP
SDA
0
0
1
1
1
0
0
0
ACK
S7
S6
S5
S4
S3
S2
S1
S0 ACK
7
6
5
4
3
2
1
0
ACK
SCL
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
3220 FO2
Figure 2. Bit Assignments
SDA
t SU, DAT
t SU, STA
t BUF
t
SCL
HD, STA
t LOW
t HIGH
t HD, DAT
t HD, STA
t SP
t SU, STO
3220 F03
START
CONDITION
t r
t f
REPEATED START
CONDITION
STOP
CONDITION
START
CONDITION
Figure 3. Timing Parameters
32201fc
11
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