AAT1230/1230-1
18V 100mA Step-Up Converter
Option 3: Dynamic Voltage Control Using
abled, the register is reset to the default value, which
sets the FB2 pin to 0.6V if EN is subsequently pulled
high.
2
S Cwire Interface
The output can be dynamically adjusted by the host
controller to any of 16 pre-set output voltage levels
2
2
using the integrated S Cwire interface. The
S Cwire Output Voltage Programming
2
EN/SET pin serves as the S Cwire interface input.
The AAT1230/1230-1 is programmed through the
2
The SEL pin must be pulled low when using the
S Cwire interface according to Table 2. The rising
2
S Cwire interface.
clock edges received through the EN/SET pin
determine the feedback reference and output volt-
age set-point. Upon power up with the SEL pin
2
S Cwire Serial Interface
2
low and prior to S Cwire programming, the default
2
AnalogicTech's S Cwire serial interface is a propri-
feedback reference voltage is set to 0.6V.
etary high-speed single-wire interface available
2
only from AnalogicTech. The S Cwire interface
EN/SET
Rising
Edges
FB2
EN/SET
FB2
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.
Reference
Rising Reference
Voltage (V)
Edges Voltage (V)
1
2
3
4
5
6
7
8
0.60 (Default)
0.64
9
0.92
0.96
1.00
1.04
1.08
1.12
1.16
1.20
10
11
12
13
14
15
16
0.68
0.72
0.76
0.80
0.84
0.88
2
S Cwire Serial Interface Timing
2
The S Cwire 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 TLAT. The output is sub-
sequently changed to the predetermined voltage.
When EN/SET is set low for a time greater than
TOFF, the AAT1230/1230-1 is disabled. When dis-
2
Table 2: S Cwire Voltage Control Settings
(SEL = Low).
THI
TOFF
TLO
TLAT
EN/SET
1
2
n-1
n ≤ 16
0
n-1
Data Reg
0
2
Figure 2: S Cwire Timing Diagram to Program the Output Voltage.
14
1230.2007.06.1.6
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
