AS3648 datasheet(29/39 Pages) AMSCO

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www.austriamicrosystems.com/AS3648

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AS3648

Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n

fault_overtemp

R/sC

see Overtemperature Protection on page 12

0No fault

Junction temperature limit has been exceeded

fault_led_short

R/sC

see Short Circuit Protection on page 12

0No fault

A shorted LED is detected (pin LED_OUT1/2)

fault_ovp

R/sC

see Overvoltage Protection on page 11

0No fault

An overvoltage condition is detected (pin VOUT)

1. R/sC = Read, self clear; after readout the register is automatically cleared

Table 15. PWM and Indicator Register

Addr: 9

PWM and Indicator Register

This register defines the PWM mode (e.g. for indicator) and 4/1MHz mode

switching

Bit

Bit Name

Default Access

Description

1:0

inct_pwm

R/W

Define the AS3648 PWM with 31.25kHz operation for

indicator or low current mode (mode_setting=01)

1/16 duty cycle

2/16 duty cycle

3/16 duty cycle

4/16 duty cycle

freq_switch_on

0R/W

Exact frequency switching between 4MHz/1MHz for assist

and flash modes for operation close to maximum

pulsewidth

Pulseskip operation is allowed for all modes -

results in better efficiency

In flash and assist light mode (indicator mode or low

current mode using PWM always will use pulseskip) if

led_current1>=40h and led_current2>=40h and

current_boost=0 , the DCDC is running at 4MHz or

1MHz (pulseskip is disabled) - results in improved

noise performance;

led_out1above2

Measure the voltage difference between LED_OUT1

vs.LED_OUT2 during operation of the DCDC

V(LED_OUT1) > V(LED_OUT2) +

VLED_OUTCOMP_HYST

Table 14. Fault Register (Continued)

Addr: 8

Fault Register

This register identifies all the different fault conditions and provide

information about the LED detection

Bit

Bit Name

Default Access

Description

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