AS3685A/AS3685B

Datasheet

www.austriamicrosystems.com/

AS3685

(ptr)

Revision 2.2

13 - 24

Table

9 – AS3685B Current Settings

H-L-H Pulses on EN1

Mode

7

261mA

370mA

2852

8

305mA

440mA

3333

9

349mA

500mA

3814

10

393mA

560mA

4295

11

437mA

620mA

4776

12

481mA

690mA

5257

13

525mA

750mA

5737

14

569mA

810mA

6218

15

613mA

880mA

6699

16

657mA

940mA

7180

17

Flash

700mA

1000mA

7650

Notes:

1) The on-time for indicator mode is 1μs, off time 31μs (32μs = 32.25kHz)

7.2.2.1 AS3685B Single Wire Interface

Using the following application schematic, a single GPIO pin can be used to control the mode and current of the

AS3685B:

Figure 18 – AS3685B Single Wire Interface

An example driving waveform can be (this uses method A as shown above in section ‘AS3685B Current

Settings’):

Figure 19 – AS3685B Example Single Wire Interface driving waveform

I

ISET

V

ISET

R

ISET

1.3 V

R

ISET

(EN2)

EN1

Set current with

number of pulses

off

off

Flash/Strobe/Indicatior function

dependent on number of previous pulses

ISET

VBAT

EN1

EN2

Vbat

EN1

single GPIO Pin to set

indicator/torch/flash mode

1nF

AS3685B