AAT1235IRN-T1 AnalogicTech, AAT1235IRN-T1 Datasheet - Page 11

• Manufacturer Part Number: AAT1235IRN-T1
• Description: High Efficiency White LED Drivers for Backlight and Keypad
• Manufacturer: AnalogicTech

SwitchReg
the T
data, and a T
address is set, then multiple writes to that address are
allowed where only data is issued. When EN/SET is held
low for an amount of time longer than T
AAT1235 enters into shutdown mode and draws less
than 1μA from the input. Data and Address registers are
cleared (reset to 0) during shutdown.
Address 0 and 1: LED Brightness Control
Outputs A1, A2, A3, B1, B2 are each capable of sinking
up to 30mA. The maximum current can be programmed
by an external resistor at the RSET pin. It is suggested to
connect up to four white LEDs in series for each channel
and to keep the same number of LEDs in each channel.
Outputs B1 and B2 are intended to drive the white LEDs
for the backlight in a phone, while A1:A3 can supply the
keypad LEDs. For large displays, all five outputs can be
used.
1235.2009.09.1.2
Address
Table 2: Address 0 and 1 for Current Setting as
Table 1: AS
Percentage of the Maximum Level Set by R
LAT
0
1
2
3
4
Data
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
timeout period, a burst of rising edges signifying
EN/SET Rising Edges
LAT
TM
2
Cwire Serial Interface Addressing.
timeout for the data registers. Once an
17
18
19
20
21
All Outputs (%)
13.5
12.0
10.5
100
9.0
84
71
60
51
43
35
31
26
21
18
15
High Efficiency White LED Drivers for Backlight and Keypad
Data Register
A1-A3, B1-B2 on
OFF
B1-B2 current
A1-A3 current
B1-B2 on/off
A1-A3 on/off
(500μs), the
w w w . a n a l o g i c t e c h . c o m
SET
.
Address 2: LED Group B ON/OFF Control
Address 3: LED Group A ON/OFF Control
Address 4: LED Groups A & B ON Control
Address 4 turns on all channels with the current pro-
grammed by Addresses 0 and 1. No DATA needs to be
provided.
Table 3: Address 2 for Group B ON/OFF State.
Table 4: Address 3 for Group A ON/OFF State.
B2
On
Data
Data
1
2
3
4
5
6
7
8
1
2
3
4
Table 5: Address 4 for Turning
B1
On
Group A and B All On.
PRODUCT DATASHEET
A1
Off
Off
Off
Off
On
On
On
On
B1
Off
Off
On
On
A1
On
AAT1235
A2
Off
Off
Off
Off
On
On
On
On
A2
On
B2
Off
Off
On
On
A3
Off
On
Off
On
Off
On
Off
On
A3
On
11