AS3658F-BCTP datasheet(140/158 Pages) AMSCO

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AS3658

Data Sheet Confidential - Deta il ed Descri ption - System Functi ons

10.8

Internal References (V, I, fclk)

The internal reference circuits needs the following external components:

Table 165. Reference External Components

Symbol

Parameter

Min

Typ

Max

Unit

Note

Table 166. References Parameters

Symbol

Parameter

Min

Typ

Max

Unit

Note

To reduce the current consumption of the chip, the circuit can be set into a special low power mode with the serial

interface bit ‘low_power_on’. All specification parameters except the noise parameters are still valid for this mode.

Table 167. Internal references Bit definitions

Addr:59

Internal references Bit definitions

These bits control the internal reference mode and internal clk

frequency

Bit

Bit Name

Default

Access

Description

10.8.1 Low Power Mode

Use bit low_power_on (reg. References Control (see Table 167)) to activate the Low Power Mode. In this mode the

on-chip voltage reference and the temperature supervision comparators are operating in pulsed mode. This reduces

the quiescent current of the AS3658 by 45uA (typ.). Because of the pulsed function some specifications are not fulfilled

in this mode (e.g. increased noise), but still the full functionality is available.

Note: Low power mode can be controlled by the serial interface.

CEXT

External filter capacitor

-10%

100

+10%

Ceramic low-ESR capacitor

between CREF and VSS

RBIAS

External bias current

set resistor

-1%

220

+1%

Bias Current set resistor between

RBIAS and VSS

VCEXT

Reference Voltage

-1%

1.8

+1%

Low noise trimmed voltage

reference – connected to Pad

CREF; do not load

fCLK

Accuracy of Internal

reference clock

-10

fCLK

+10

Adjustable by serial interface

low_power_on

R/W

Standard mode

Low power mode – all specification except

noise parameters are still valid

3:1

clk_int

110b

R/W

Sets the internal CLK frequency fCLK used for fuel

gauge, DCDCs, PWM, charge pump.

All frequencies, timings and delays in this datasheet

are based on 2.2MHz clk_int

000b

1.6 MHz

001b

1.7 MHz

010b

1.8 MHz

011b

1.9 MHz

100b

2.0 MHz

101b

2.1 MHz

110b

2.2 MHz (default)

111b

2.3 MHz

AS3658F-BCTP Datasheet(PDF) 140 Page - ams AG

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