AAT1230 Datasheet, PDF (14/21 Pages) Advanced Analogic Technologies – 18V 100mA Step-Up Converter

Option 3: Dynamic Voltage Control Using
S²Cwire Interface
The output can be dynamically adjusted by the host
controller to any of 16 pre-set output voltage levels
using the integrated S²Cwire interface. The
EN/SET pin serves as the S²Cwire interface input.
The SEL pin must be pulled low when using the
S²Cwire interface.
S²Cwire Serial Interface
AnalogicTech's S²Cwire serial interface is a propri-
etary high-speed single-wire interface available
only from AnalogicTech. The S²Cwire interface
records rising edges of the EN/SET input and
decodes into 16 different states. Each state corre-
sponds to a voltage setting on the FB2 pin, as
shown in Table 2.
S²Cwire Serial Interface Timing
The S²Cwire serial interface has flexible timing.
Data can be clocked-in at speeds up to 1MHz. After
data has been submitted, EN/SET is held high to
latch the data for a period T_LAT. The output is sub-
sequently changed to the predetermined voltage.
When EN/SET is set low for a time greater than
T_OFF, the AAT1230 is disabled. When disabled, the
register is reset to the default value, which sets the
FB2 pin to 0.6V if EN is subsequently pulled high.
AAT1230
18V 100mA Step-Up Converter
S²Cwire Output Voltage Programming
The AAT1230 is programmed through the S²Cwire
interface according to Table 2. The rising clock
edges received through the EN/SET pin determine
the feedback reference and output voltage set-
point. Upon power up with the SEL pin low and
prior to S²Cwire programming, the default feed-
back reference voltage is set to 0.6V.
EN/SET
Rising
Edges
1
2
3
4
5
6
7
8
FB2
Reference
Voltage (V)
0.60 (Default)
0.64
0.68
0.72
0.76
0.80
0.84
0.88
EN/SET
Rising
Edges
9
10
11
12
13
14
15
16
FB2
Reference
Voltage (V)
0.92
0.96
1.00
1.04
1.08
1.12
1.16
1.20
Table 2: S²Cwire Voltage Control Settings
(SEL = Low).
EN/SET
Data Reg
T_HI
T_LO
T _LAT
1
2
n-1
n ≤ 16
0
TOFF
n-1
0
Figure 3: S²Cwire Timing Diagram to Program the Output Voltage.
14
1230.2006.03.1.0