Datasheet

LTC3562
13
3562fa
Table 1. Write Word Protocol Used by the LTC3562
171181811
S Slave Address WR A
*Sub-Address A Data Byte A P**
S = Start Condition, WR = Write Bit = 0, A = Acknowledge, P = Stop Condition
* The sub-address uses only the fi rst four most signifi cant bits, A7, A6, A5, and A4, for sub-addressing. The two least signifi cant bits, A1 and A0, are
used to program the regulator operating mode.
**Stop can be delayed until all of the data registers have been written.
Table 2. Sub-Address and Data Byte Mapping
SUB-ADDRESS BYTE DATA BYTE
A7 A6 A5 A4 A3 A2 A1 A0 B7 B6 B5 B4 B3 B2 B1 B0
PROGRAM
R600A
PROGRAM
R400A
PROGRAM
R600B
PROGRAM
R400B
NOT USED REGULATOR
OPERATING
MODE
(SEE TABLE 3)
ENABLE
REGULATOR
DAC CODE
(See Tables 4, 5 and 6)
Figure 3. Bit Assignments
Figure 4. Timing Parameters
OPERATION
ACK
123
ADDRESS WR
456789123456789123456789
1100101 0
11001010
A7 A6 A5 A4 A3 A2 A1 A0
A7 A6 A5 A4 A3 A2 A1 A0
B7 B6 B5 B4 B3 B2 B1 B0
76543210
ACK
STOPSTART
SDA
SCL
ACK
SUB-ADDRESS
DATA BYTE
3562 F03
t
SU, DAT
t
HD, STA
t
HD, DAT
SDA
SCL
t
SU, STA
t
HD, STA
t
SU, STO
3562 F04
t
BUF
t
LOW
t
HIGH
START
CONDITION
REPEATED START
CONDITION
STOP
CONDITION
START
CONDITION
t
r
t
f
t
SP