AS3642 datasheet(17/27 Pages) AMSCO

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AS3642

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

AS3642 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

current_mode

R/W

Define the current on pin LED_OUT

LED_OUT current is defined by ind_current,

assist_current and flash_current

01 LED_OUT current is defined by register 2, bits <7:3>

LSB = 10mA, full range = 320mA

11 LED_OUT current is defined by register 2, bits <7:3>

LSB = 15.625mA, full range = 500mA

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

ind_current

R/W

Define the current on pin LED_OUT in indicator mode if

current_mode=00 or 10

ILED_OUT = 1.35mA (PWM with 1/32 duty cycle)

ILED_OUT = 2.9mA (PWM with 2/32 duty cycle)

ILED_OUT = 4.4mA (PWM with 3/32 duty cycle)

ILED_OUT = 6.0mA (PWM with 4/32 duty cycle)

assist_current

1R/W

Define the current on pin LED_OUT in assist light mode if

current_mode=00 or 10

0ILED_OUT = 51.6mA

1ILED_OUT = 72.3mA

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