AS3658 datasheet(87/158 Pages) AMSCO

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AS3658

Data Sheet Confidential - Detail ed Descri ption-Power Management Functions

Make the connections of the external capacitors as short as possible.

Table 85. Charge Pump Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

Table 86. CP Power1 ctrl Bit definitions

Addr:23

Reg Power1 Ctrl

These bits control the on/off function of the ldo regulator

Bit

Bit Name

Default

Access

Description

Table 87. Charge Pump Bit definitions

Addr:17

Charge Pump Control

These bits control the Charge Pump

Bit

Bit Name

Default Access

Description

VCPIN

Charge Pump input

voltage

3.0

5.5

fIN

Switching frequency

1.1

MHz

cp_freq=0, fclk_int=2.2MHz

0.55

MHz

cp_freq=1, fclk_int=2.2MHz

ICPOUT

Output Current

0.0

100

VCP_IN = 3.2V, Clock = fclk_int/2;

cp_pulseskip=0; fin=1.1MHz

VCPOUT

Output Voltage

4.9

5.2

5.6

VCPSKIP

Output Voltage during

pulseskip

4.92

Use with cp_frequ=1 only

ICP_noload

Supply current without

load

1.1MHz switching frequency

ICP_pulseskip

Charge pump supply

current without load in

pulseskip mode

µA

cp_pulseskip=1 and cp_frequ=1

cp_on

ROM

R/W

Switch on of the charge pump block, charge pump is

automatically activated if any of the following blocks are

active: VDIG_1, VDIG_2, VDIG_3, VDIG_4

cp_pulseskip

ROM

R/W

Switches on the pulseskip mode of the charge pump

Normal fixed frequency mode

Pulse skip, low power mode (Set cp_frequ=1 in

this mode)

cp_freq

ROM

R/W

Defines the clock frequency of the step up dc/dc converter

fclk_int/2 (0.8 to 1.15 MHz)

fclk_int/4 (0.4 to 0.575 MHz)

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