AS3665 datasheet(40/78 Pages) AMSCO

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AS3665

Datasheet, Confidential - D e taile d D e scri pti on Tr igg er pin TRIG

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.

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 51. Exec_Mode Register

Addr: 01h

Exec_Mode Register

Bit

Bit Name

Default Access

Description

trig_input_on

R/W

Enable external trigger input on pin TRIG

External trigger disabled

External trigger enabled

Table 52. Supervision Register

Addr: 08h

Supervision Register

Bit

Bit Name

Default Access

Description

ov_temp_on

1. Always leave ov_temp_on set.

R/W

Overtemperature protection

Overtemperature protection disabled

Overtemperature protection enabled

ov_temp_status

R/W

Overtemperature protection triggered

No overtemperature detected

Overtemperature detected

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