AS3668_07 datasheet(16/59 Pages) AMSCO

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AS3668

Data Sheet - Detailed Description

8.1.4 Charge Pump Control Register .

8.2 Current Sources

The AS3668 features four general purpose current sources. All current sources and be controlled independently from each other and share

internally the same power supply VCP.

Table 7. Reg Control Register

0x00 Reg Control register

Bit

Bit Name

Default

Access

Bit Description

cp_on

R/W

This bit enables the charge pump for operation if at lease one current source

is enabled and the current source has a low voltage condition. Once the

charge pump is running it will be keep on even if all current sources are

switched off.

0: Chargepump off

1: Charge Pump on

Table 8. CP Control Register

0x23 Current Control Register

Bit

Bit Name

Default

Access

Bit Description

cp_auto_on

R/W

This bit enables the charge pump for operation. Once at last one current

source is enabled and minimum one current source has a low voltage

condition the charge pump is switched on. If all current sources are switched

off again the charge will also switch of automatically.

0: Chargepump off

1: Chargepump on in automatic mode

cp_start_debounce

R/W

Selects the startup debounce time of the charge pump

0: 32ms debounce time.

1: 240μs debounce time

cp_mode_switching

R/W

Allows the user to select between automatic mode switching or manual

mode switching of the charge pump. If the bit is set, the user can change

pump.

0: Automatic CP Mode Switching

1: Manual CP Mode Switching using register cp_mode

cp_mode

R/W

Selects the charge pump operating mode if register cp_mode_switching is

set to 1. Reading the register return the mode in which the charge pump is

operating, either 1:1 or 1:2 mode.

0: 1:1 mode

1: 1:2 mode

cp_clk

R/W

Selects the charge pump clock frequency.

0: 1Mhz

1: 500kHz

Table 9. Current Sink Function Overview

Current Sink

Max. Voltage

(V)

Max. Current

(mA)

Resolution

Software Current

Control

Hardware On/Off Control

(Bits)

(mA)

CURR1

5.5

25.5

0.1

Separate for each

current source

Internal PWM; external

PWM at GPIO/AUDIO_IN,

Pattern generator

CURR2

CURR3

CURR4

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