AS3649 datasheet(22/39 Pages) AMSCO

22 / 39 page

AS3649

Datasheet - Detailed Descr i p ti on

www.ams.com/AS3649

1.0-2

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Figure 30. Data Read (Write Pointer, Then Read) - Slave Receive and Transmit

8.9 Register Description

Table 7. ChipID Register

Addr: 0

ChipID Register

This register has a fixed ID

Bit

Bit Name

Default

Access

Description

2:0

version

AS3649 chip version number

7:3

fixed_id

11000b

This is a fixed identification (e.g. to verify the I

2C communication)

Table 8. Current Set LED1 Register

Addr: 1

Current Set LED1 Register

This register defines design versions

Bit

Bit Name

Default

Access

Description

7:0

led_current1

9Ch

R/W

Define the current on pin LED_OUT1;

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)

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

FFh

1000mA (1250mA

1 if current_boost=1)

0110000

XXXXXXXX

0110000

<Data(n+2)>

S - Start

Sr - Repeated Start

A - Acknowledge (ACK)

P - Stop

NA - Not Acknowledge (NACK)

XXXXXXXX

<Data(n)>

<Data(n+1)>

<Data(n+X)>

Data Transferred

(X + 1 Bytes + Acknowledge)

Note: Last data byte is followed by a NACK

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