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AS3685A Datasheet(PDF) 11 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

Part No. AS3685A
Description  Ultra Small High Efficiency 1000mA Charge Pump
Download  25 Pages
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Maker  TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS]
Homepage  http://www.taosinc.com
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AS3685A Datasheet(HTML) 11 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

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AS3685A/AS3685B
Datasheet
www.austriamicrosystems.com/
AS3685
(ptr)
Revision 2.2
10 - 24
Application Hint
: To obtain higher torch currents use the following circuit:
Figure 13 – AS3685A Increasing Torch Current
ISET
VBAT
EN1
EN2
VBAT
EN1
EN2
RTORCH
AS3685A
RISET
7.2.1.1 AS3685A Pulsed Indicator Mode
The torch mode is controlled by EN1=0 and EN2=1 as following figure shows:
Figure 14 – AS3685A Torch Mode
EN2
EN1
off
off
Torch
Current
ILED
t
typ. 64µs
To allow an indication function using short pulses (with torch current settings), the pulsed indicator mode can be
used. The control device sends a setup sequence (total time required: less than 128μs) to ‘program’ the
AS3685A, and the AS3685A enables its current sink for the duration tTORCH (the current used is exactly the torch
current setting). Therefore the control does not need to setup an timer to accurately define the duration of the
indicator pulse.
The duration tTORCH can be setup from 1ms to 15ms depending on the number of pulses on EN2 as shown in the
following figure and table:


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