AS3643 datasheet(24/34 Pages) AMSCO

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AS3643

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

Table 10. Low Voltage Register

Addr: 4

Low Voltage Register

This register defines the operating mode with low battery voltages

Bit

Bit Name

Default Access

Description

2:0

vin_low_v_run

R/W

Voltage level on VIN where current reduction triggers during

operation (see Current Reduction by VIN measurements in

Flash Mode on page 15) - only in flash mode; if VIN drops

below this voltage during current ramp up, the current ramp

up is stopped; during operation the current is decreased

until the voltage on VIN rises above this threshold -

fault_uvlo is set

function is disabled

3.0V

3.07V

3.14V

3.22V - default

3.3V

3.38V

3.47V

5:3

vin_low_v

R/W

Voltage level on VIN where driver will change current before

startup (only in flash mode)

if before startup (out_on set from 0 to 1), the voltage on VIN

is below vin_low_v, the current is changed to

flash_txmask_current (vin_low_v_shutdown=0) or

0=shutdown (vin_low_v_shutdown=1) and fault_uvlo is set

function is disabled

3.0V

3.07V

3.14V

3.22V

3.3V - default

3.38V

3.47V

vin_low_v_shutdown

0R/W

Enables Shutdown of current reduction under low voltage

conditions

if before startup (out_on set from 0 to 1), the voltage

on VIN is below vin_low_v, the current is changed to

flash_txmask_current and fault_uvlo is set

if before startup (out_on set from 0 to 1), the voltage

on VIN is below vin_low_v, the operating mode stays

in shutdown (zero LED current) and fault_uvlo is set

const_v_mode

0R/W

Enables Constant output voltage mode

Normal operation defined by mode_setting

5V constant voltage mode on VOUT1/2;

reset registers mode_setting, out_on and

ext_torch_on before setting this bit

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