AS3649 datasheet(23/39 Pages) AMSCO

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AS3649

Datasheet - Detailed Descr i p ti on

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Table 9. Current Set LED2 Register

Addr: 2

Current Set LED2 Register

This register defines design versions

Bit

Bit Name

Default

Access

Description

7:0

led_current2

9Ch

R/W

Define the current on pin LED_OUT2;

torch mode uses bits 5:0 of this current setting (max. 1/4 of full current

setting)

indicator or low current pwm mode uses only 5:0 of this current setting

(max. 1/4 of full current setting)

Note: Always keep led_current1 >= led_current2

0mA

7.8mA

11.7mA

...

3Fh

250mA (maximum current for torch light mode, indicator or low

current pwm mode,

mode_setting=01 or 10)

...

7Fh

500mA

...

9Ch

613.3mA - default setting

...

FEh

996mA (1245mA

1 if current_boost=1)

FFh

1000mA (1250mA

1 if current_boost=1)

1. Only use current_boost=1 for currents > 1000mA(code >= CCh)

Table 10. TXMask Register

Addr: 3

TXMask Register

This register defines the TXMask settings and coil peak current

Bit

Bit Name

Default

Access

Description

1:0

txmask_torch_mode

R/W

Defines operating mode for input pin TXMASK/TORCH

pin has no effect

txmask-mode; during flash if TXMASK/TORCH=1, the LED

current is set to flash_txmask_current - (see TXMASK on page

15)

external torch mode: if TXMASK/TORCH=1 and

mode_setting=00, the AS3649is set into external torch mode

(LED current is defined by the 6LSB

1 bits of led_current1 and

led_current2)

don’t use

3:2

coil_peak

R/W

Defines the maximum coil current (parameter ILIMIT)

ILIMIT = 2.5A

ILIMIT = 2.9A

ILIMIT = 3.3A

ILIMIT = 3.7A

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