AS3644 datasheet(16/24 Pages) AMSCO

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AS3644

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

Table 4. Design Info Register

Addr: 0

Design Info Register

This register has a fixed ID

Bit

Bit Name

Default Access

Description

7:0

fixed_id

13h

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

communication)

Table 5. Version Control Register

Addr: 1

Version Control Register

This register defines design versions

Bit

Bit Name

Default Access

Description

3:0

version

AS3644 version number

7:4

reserved

reserved - don’t use

Table 6. Current Set Register

Addr: 2

Current Set Register

This register defines the Current Settings

Bit

Bit Name

Default Access

Description

1:0

reserved

reserved - don’t use

freq_switch_on

1R/W

Exact frequency switching between 4MHz/1MHz for assist

and flash modes for operation close to maximum

pulsewidth - see Figure 17 on page 10

Pulseskip operation is allowed for all modes -

results in better efficiency

In flash and assist light mode, the DCDC is running at

4MHz or 1MHz (pulseskip is disabled) -

results in improved noise performance

4:3

reserved

reserved - don’t use

assist_current

1R/W

Define the current on pin LED_OUT in assist light mode

0ILED_OUT = 51.6mA

1ILED_OUT = 72.3mA

7:6

flash_current

R/W

Define the current on pin LED_OUT in flash mode

ILED_OUT = 260mA

ILED_OUT = 280mA

ILED_OUT = 300mA

ILED_OUT = 320mA

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