AS3645 austriamicrosystems, AS3645 Datasheet - Page 29

• Manufacturer Part Number: AS3645
• Description: 1000/720ma Ultra Small High Efficient Single/dual Led Flash Driver With Safety Features
• Manufacturer: austriamicrosystems

AS3645
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 30. Layout recommendation
Note: If component placement rules allow, move all components close to the AS3645 to reduce the area and length
Application Self Testing Guideline
The AS3645 includes several fault and configuration detection functions (see
on page
Depending on the operating mode following procedures are possible (for all tests the AS3645 should be started first by
enabling e.g. torch mode to test the flash LED and the DCDC converter and enabling indicator mode to test the indica-
tor LED):
Table 19. Application Self Testing Failure Detection Procedures
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Enable AS3645 Torch Mode and wait at least 1ms to detect following faults
One Flash LED is shorted in
(single LED configuration)
a dual LED configuration
Inductor missing or open
(dual LED configuration)
High ohmic connection
High ohmic connection
Flash LED is shorted
(single or dual LED
Flash LED is open
Possible Failure
of the flash LED
of Loop1 and Loop2.
of the flash LED
configuration)
11). Therefore it is possible to selftest the application during assembly and manufacturing of the end-device.
either bit
register bit
register bit
register bit
not set (a ‘1’ is expected in a dual LED
if production equipment has access to
register bit
register bit
SCL/EN1 and SDA_EN2
fault_ovp
fault_ovp (see page 24)
fault_led_short (see page 24)
led_amount (see page 24)
configuration)
I
fault_led_short
2
C mode
is set
is set
is set or bit
fault_ovp
Revision 1.6
is set
led_amount
is set
can be identified in
is set
is
battery current and can initiate flash/torch
if production equipment can measure the
no (additional) current on the battery or
Protection and Fault Detection Functions
no (additional) current on the battery
no (additional) current on the battery
no (additional) current on the battery
no (additional) current on the battery
STROBE=L see
STROBE=H (open drain)
Detection (see page 12)
parallel interface mode
and indicator
Single/Dual LED
1
2
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