AS3658 datasheet(64/158 Pages) AMSCO

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Table 57. Charger Current Bit definitions

Addr:16

Charger current

These bits define the battery charging current and voltage

Bit

Bit Name

Default Access

Description

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AS3658

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

8.10

Charger supervision functions

The charger supervision functions allow charging without processor control by continuously checking the NTC

temperature resistor within the battery pack using ADC_IN1 pin. The charging cycle is automatically paused, if the

NTC indicates a temperature range out of 0º to 45º (or 0º to 50º). If the temperature gets into this range again the

charging cycle is resumed.

In addition there is a charge timer that stops charging after a defined time, as additional security feature.

The timer will be reset at charger insertion (charger detect) or at EOC state. The timer is counting during active

charging only (Trickle charging, Constant current charging, Constant voltage charging).

In case the battery voltage does not reach EOC voltage within tCHARGINGMAX after charging has been started,

charging_tmax interrupt will be generated and charging will be stopped. Charging can be started again by writing

charging_tmax=0 in the charger_control1 register.

1:0

TrickleCurrent

ROM

R/W

Sets the trickle current. Default is (01)b = 2.5mV x Rsense

-1

00b

1.25mV x Rsense

-1

01b

2.50mV x Rsense

-1

10b

5.00mV x Rsense

-1

11b

10.0mV x Rsense

-1

4:2

ConstantCurrent

ROM

R/W

Sets the charging current in constant current mode

from (0mV…35mV) x Rsense

-1

in steps of 5mV x

Rsense

-1

000

0mV x Rsense

-1

001

5mV x Rsense

-1

....

111

35mV x Rsense

-1

7:5

ch_voltage

ROM

R/W

Charger voltage after EOC and isolate_battery=1

000b

4.3V

001b

4.4V

010b

4.5V

011b

4.6V

100b

4.7V

101b

4.8V

110b

4.9V

111b

5.0V

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