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AS3665
Datasheet, Confidential - D e t a i l e d D e s c r i p t i o n Tr i g g e r p i n T R I G
Trigger pin TRIG
Trigger commands can be sent by the internal sequencers to any other sequencer and or to/from the pin TRIG using
the sequencer command Trigger (see page 55) . The pin TRIG is active low, requires and external pullup resistor and
the input should be enabled by setting trig_input_on =1.
Table 51. Exec_Mode Register
Addr: 01h
Exec_Mode Register
Bit
Bit Name
Default Access
Description
Enable external trigger input on pin TRIG
7
trig_input_on
0b
R/W
0
External trigger disabled
1
External trigger enabled
Sent external trigger commands are three 32.768kHz clock cycles (see Clock Generation on page 14 ) long and
received external triggers shall be longer than two clock cycles. During sending of an external trigger, the TRIG input is
blocked.
Note: If two AS3665 devices send an external trigger at the exactly same time, the trigger command might get lost.
Therefore it is recommended that only one AS3665 in a system should send trigger command and all other
devices only receive trigger commands.
It is recommend to configure trig_input_on before program execution as changing trig_input_on during pro-
gram execution can set a trigger pulse to the program.
LED Test
To test the LED in the production line, force a test current through the to be tested LED. Measure the voltage on the
LED (by setting adc_select (see page 33) to the LED channel LED1...LED9). If the voltage on the LED is within the
specified parameters for the LED, the LED is working properly.
Temperature Supervision
The temperature supervision protect the AS3665 against overtemperature - in case of overtemperature the AS3665 is
reset (and therefore the charge pump is set back to 1:1 mode and all current sources are switched off). It is recom-
mended to leave the temperature supervision always enabled (register bit ov_temp_on , default on):
Table 52. Supervision Register
Addr: 08h
Supervision Register
Bit
Bit Name
Default Access
Description
Overtemperature protection
ov_temp_on
0
1
1h
R/W
0
Overtemperature protection disabled
1
Overtemperature protection enabled
Overtemperature protection triggered
1
ov_temp_status
0h
R/W
0
No overtemperature detected
1. Always leave ov_temp_on set.
1
Overtemperature detected
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