AAT3172
High Current LED Flash Driver Charge Pump IC
After shutdown, if only data is issued with the first
ON/OFF Register (Address 4)
rising edge (i.e., 1 - 16 edges, no address given),
both current sinks will be programmed since the
default will be Address 0.
Data
MODE
1
2
ON
OFF
AS2Cwire Serial Interface Addressing
Voltage Register (Address 6)
EN/SET
Address Rising Edges
Data Register
Data
MODE
0
17
F1 and F2
Current Scale
F1 Current Scale
F2 Current Scale
HI/LO
1
2
Current
Voltage
1
2
3
4
5
6
18
19
20
21
22
23
Thermal Protection
The AAT3172 has a thermal protection circuit that
will shut down the charge pump if the die tempera-
ture rises above the thermal limit, as is the case
during a short circuit of the OUT pin.
ON/OFF
Reserved
Voltage/Current Mode
HI/LO Scale Register (Address 3)
Data
F1
F2
1
2
3
4
LO
HI
LO
HI
LO
HI
HI
LO
AS2Cwire Serial Interface Timing
Address
Data
THI
TLAT
TLO
TLAT
EN/SET
Address
1
2
17
18
1
2 . . .
n <= 16
0
1
Data Reg 1
Data Reg 2
0
0
n - 1
10
3172.2006.05.1.5
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
