Datasheet > AAT3151B_08

AAT3151B_08

更新时间： 2022-04-23 23:00:11

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ANALOGICTECH		泵
页数	文件大小	规格书
13页	291K
描述
High Efficiency 1X/1.5X Charge Pump For White LED Applications

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AAT3151B_08 数据手册

PRODUCT DATASHEET

AAT3151B

ChargePump

High Efficiency 1X/1.5X Charge Pump For White LED Applications

held high for time T_LAT. Address or data is differentiated

by the number of EN/SET rising edges. Since the data

20mA Max¹

I_OUT(mA)

30mA Max 15mA Max

Data

I_OUT(mA)

registers are 4 bits each, the differentiating number of

pulses is 24 or 16, so 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, fol-

lowed by a pause with EN/SET held high for the T_LAT

timeout period, a burst of rising edges signifying data,

and a T_LATtimeout for the data registers. Once an

address is set, then multiple writes to the corresponding

data register are allowed.

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

8.6

7.6

6.7

6.2

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.

5.1

4.4

4.1

0.0

Table 1: Constant Current Programming

Levels (mA)².

AS²Cwire Addressing

AS²Cwire Serial Interface

A number of addresses are available to control all of the

part’s functionality. Use Address 1 to program all four

LED channels to any one of 16 possible settings that

depend on the Max Current scale setting. Use Address 4

to program the Max Current register, which sets the Max

Current scale. Address 5 programs the Low Current

efficient Low Current mode.

The AS²Cwire single wire interface is used to set the pos-

sible combinations of current levels and LED channel

states.

AS²Cwire relies on the number of rising edges of the EN/

SET pin to address and load the registers. AS²Cwire

latches data or address after the EN/SET pin has been

AS²Cwire Serial Interface Timing

Address

Data

T_HI

T_LAT

T_LO

T_LAT

EN/SET

2 . . .

n <= 16

Address

Data Reg 1

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.

w w w . a n a l o g i c t e c h . c o m

3151B.2008.02.1.1

1...6 7 8910 11 12 13

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