Datasheet > AAT3151B

AAT3151B

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		泵
页数	文件大小	规格书
15页	266K
描述
High Efficiency 1X/1.5X Charge Pump For White LED Applications

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AAT3151B 数据手册

AAT3151B

High Efficiency 1X/1.5X Charge Pump

For White LED Applications

drive can be changed successively to brighten or

dim LEDs in smooth transitions (e.g., to fade out) or

in abrupt steps, giving the user complete program-

mability and real-time control of LED brightness.

AS Cwire Serial Interface

The AS Cwire single wire interface is used to set

the possible combinations of current levels and

LED channel states.

For each Max Current scale, there are 16 current

level settings separated from one another by

approximately 1dB. Code 1 is full-scale current and

Code 15 is full-scale current attenuated by roughly

14dB. Code 16 is reserved as a "no current" setting

(see Table 1).

AS Cwire relies on the number of rising edges of

the EN/SET pin to address and load the registers.

AS Cwire latches data or address after the EN/SET

pin has been held high for time T_LAT. Address or

data is differentiated by the number of EN/SET ris-

ing edges. Since the data registers are 4 bits each,

the differentiating number of pulses is 2 or 16, so

The AAT3151B has an additional Low Current

mode with reduced quiescent current. This mode is

especially useful for low-current applications where

a continuous, low-current state is maintained. The

reduction in quiescent current significantly reduces

the impact due to maintaining a continuous back-

lighting state.

that Address 1 is signified by 17 rising edges,

Address 2 by 18 rising edges, and so forth. Data is

set to any number of rising edges between 1 and

including 16. A typical write protocol is a burst of

EN/SET rising edges, signifying a particular

address, followed by a pause with EN/SET held

high for the T_LATtimeout period, a burst of rising

edges signifying data, and a T_LATtimeout for the

data registers. Once an address is set, then multi-

ple writes to the corresponding data register are

allowed.

20mA Max 30mA Max 15mA Max

Data

I_OUT(mA)

20.0

17.8

15.9

14.3

12.7

11.1

10.2

8.9

7.9

7.0

6.3

5.7

30.0

26.7

23.8

21.4

19.0

16.7

15.2

13.3

11.9

10.5

9.5

15.0

13.3

11.9

10.7

9.5

8.3

7.6

6.7

6.0

5.2

4.8

4.3

3.8

3.3

3.1

0.0

When EN/SET is held low for an amount of time

greater than T_OFF, the AAT3151B enters shutdown

mode and draws less than 1µA from the supply.

Address 1 is the default address on the first rising

edge after the AAT3151B has been disabled.

Whenever shutdown mode is entered, all registers

are reset to 1.

8.6

7.6

6.7

6.2

5.1

4.4

4.1

0.0

Table 1: Constant Current Programming

Levels (mA) .

1. The device defaults to the 20mA Max scale. Use the Max Current Register to change the Max Scale.

2. There is an additional Low Current mode with currents down to 50µA. See the Low Current Register Settings section.

3151B.2007.09.1.0

1...6 7 8910 11 12...15

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