- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄381232 > AAT1236IRN-T1 (Advanced Analog Technology,lnc.) High Efficiency White LED Drivers for Backlight and Keypad PDF資料下載
參數(shù)資料
| 型號(hào)： | AAT1236IRN-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | High Efficiency White LED Drivers for Backlight and Keypad |
| 中文描述： | 高效率白光LED的背光和鍵盤驅(qū)動(dòng)程序 |
| 文件頁(yè)數(shù)： | 15/24頁(yè) |
| 文件大?。?/td> | 1009K |
| 代理商： | AAT1236IRN-T1 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)當(dāng)前第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)
AAT1236
High Efficiency White LED Drivers
for Backlight and Keypad
1236.2007.02.1.1
15
I
2
C Software Protocol Example
The AAT1236 I
2
C programming protocol is shown
in the following two examples, detailing the device
address, register address and data bits. Figure 5
shows the I
2
C transfer protocol.
Example 1:
Turn on Group A with 15% from the max current
setting and turn on Group B with 51% from the max
current setting.
1. Send a start condition
2. Send the AAT1236's I
2
C device address (0x36)
with the R/W bit set low
3. Wait for the acknowledge (ACK) bit within the
clock cycle
4. Send the BR_CTRL register address (0x00)
5. Wait for the ACK bit within the clock cycle
6. Send the BR_CTRL Data (0x4B)
7. Wait for the ACK bit within the clock cycle
8. Send the CH_CTRL register address (0x01)
9. Wait for the ACK bit within the clock cycle
10. Send the CH_CTRL Data (0x1F)
11. Wait for the ACK bit within the clock cycle
12. Send the stop condition
Example 2:
Turn on A1 and A3 with 43% for the max LED cur-
rent setting and turn on Group B with 100% for the
max LED current setting. Figure 6 shows the I
2
C
transfer protocol.
1. Send a start condition
2. Send the AAT1236's I
2
C device address (0x36)
with the R/W bit set low
3. Wait for the acknowledge (ACK) bit within the
clock cycle
4. Send the BR_CTRL register address (0x00)
5. Wait for the ACK bit within the clock cycle
6. Send the BR_CTRL Data (0x05)
7. Wait for the ACK bit within the clock cycle
8. Send the CH_CTRL register address (0x01)
9. Wait for the ACK bit within the clock cycle
10. Send the CH_CTRL Data (0x1D)
11. Wait for the ACK bit within the clock cycle
12. Send the stop condition
Channel Disable
Tie all unused channels to AGND. On start-up
these channels will be automatically disabled.
LED Selection
Although the AAT1236 is specifically designed to
drive white LEDs, the device can also be used to
drive most types of LEDs with forward voltages
ranging between 2.0V and 4.7V. Since the A1, A2,
A3, and B1, B2 input current sinks are matched with
low voltage dependence, the LED-to-LED bright-
ness will be matched regardless of the individual
LED forward voltage (V
F
) levels. In some instances,
it may be necessary to drive high-V
F
type LEDs.
The low dropout (~0.1V @ 20mA I
LED
) current sinks
in the AAT1236 make it capable of driving LEDs with
forward voltages as high as 4.7V from an input sup-
ply as low as 3.0V. LED outputs A1-A3 and B1-B2
can be combined to drive high-current LEDs without
complication, making the AAT1236 a perfect appli-
cation for large LCD display backlighting and key-
pad LED applications.
Figure 5: I
2
C Transfer Protocol for Example 1.
Figure 6: I
2
C Transfer Protocol for Example 2.
S
T
A
R
T
Device Address
(Write)
A
C
K
Register Address
1
1
0
0
1
1
0
0
Data
A
C
K
SDA
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
A
C
K
Register Address
Data
0
0
0
1
0
0
0
0
0
0
1
1
1
1
0
0
A
C
K
A
C
K
S
T
O
P
S
T
A
R
T
Device Address
(Write)
A
C
K
Register Address
1
1
0
0
1
1
0
0
Data
A
C
K
SDA
0
0
0
0
0
0
0
0
1
1
0
1
1
0
0
0
A
C
K
Register Address
Data
0
0
0
1
0
0
0
0
0
1
1
1
1
1
0
0
A
C
K
A
C
K
S
T
O
P
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AAT1343 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| AAT1343-T1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| AAT1343-T1-T | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| AAT1403A | SIX-CHANNEL DIGITAL STILL CAMERA POWER SUPPLY |
| AAT1403B | SIX-CHANNEL DIGITAL STILL CAMERA POWER SUPPLY |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT1239-1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:40V Step-Up Converter for 4 to 10 White LEDs |
| AAT1239-1_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:40V Step-Up Converter for 4 to 10 White LEDs |
| AAT1239-1_0810 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:40V Step-Up Converter for 4 to 10 White LEDs |
| AAT1239ITP-1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:40V Step-Up Converter for 4 to 10 White LEDs |
| aat1239itp-1-db1 | 制造商:Skyworks Solutions Inc 功能描述:AAT1239 Series 40 V Step-Up Converter for 4 to 10 White LEDs Eval Board |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。