PS501 datasheet(22/42 Pages) MICROCHIP

22 / 42 page

PS501

DS21818C-page 22

 2004 Microchip Technology Inc.

8.1.12

AverageCurrent (0x0b)

Returns a one-minute rolling average based on at least

60 samples of the current being supplied (or accepted)

through the battery’s terminals (mA).

8.1.13

MaxError (0x0c)

Returns the expected margin of error (%) in the State-

Of-Charge calculation. For example, when MaxError

returns 10% and RelativeStateOfCharge returns 50%,

the RelativeStateOfCharge is actually between 50%

and 60%. The MaxError of a battery is expected to

increase until the Smart Battery identifies a condition

that will give it higher confidence in its own accuracy.

For example, when a Smart Battery senses that it has

been fully charged from a fully discharged state, it may

use that information to reset or partially reset MaxError.

The Smart Battery can signal when MaxError has

become too high by setting the CONDITION_FLAG bit

in BatteryMode.

8.1.14

RelativeStateOfCharge (0x0d)

Returns the predicted remaining battery capacity

expressed as a percentage of FullChargeCapacity (%).

8.1.15

AbsoluteStateOfCharge (0x0e)

Returns the predicted remaining battery capacity

expressed as a percentage of DesignCapacity (%).

Note that AbsoluteStateOfCharge can return values

greater than 100%.

8.1.16

RemainingCapacity (0x0f)

Returns the predicted remaining battery capacity. The

RemainingCapacity value is expressed in either current

(mAh) or power (10 mWh), depending on the setting of

the BatteryMode’s CAPACITY_MODE bit.

8.1.17

FullChargeCapacity (0x10)

Returns the predicted pack capacity when it is fully

charged. It is based on either current or power,

depending on the setting of the BatteryMode’s

CAPACITY_MODE bit.

8.1.18

RunTimeToEmpty (0x11)

Returns the predicted remaining battery life at

the present

rate

discharge

(minutes).

The

RunTimeToEmpty value is calculated based on either

current or power, depending on the setting of the

BatteryMode’s CAPACITY_MODE bit. This is an impor-

tant distinction because use of the wrong calculation

mode may result in inaccurate return values.

8.1.19

AverageTimeToEmpty (0x12)

Returns

one-minute

rolling

average

the

predicted remaining

battery

life

(minutes).

The

AverageTimeToEmpty value is calculated based on

either current or power, depending on the setting of the

BatteryMode’s CAPACITY_MODE bit. This is an impor-

tant distinction because use of the wrong calculation

mode may result in inaccurate return values.

8.1.20

AverageTimeToFull (0x13)

Returns a one-minute rolling average of the predicted

remaining time until the Smart Battery reaches full

charge (minutes).

8.1.21

ChargingCurrent (0x14)

Sets the maximum charging current for the Smart

Charger to charge the battery. This can be written to the

Smart Charger from the Smart Battery or requested by

the Smart Charger from the battery.

8.1.22

ChargingVoltage (0x15)

Sets the maximum charging voltage for the Smart

Charger to charge the battery. This can be written to the

Smart Charger from the Smart Battery or requested by

the Smart Charger from the battery.

8.1.23

BatteryStatus (0x16)

Returns the Smart Battery’s status word (flags). Some of the

BatteryStatus flags, like REMAINING_CAPACITY_ALARM

and REMAINING_TIME_ALARM, are calculated based

on either current or power, depending on the setting of

the BatteryMode’s CAPACITY_MODE bit. This is impor-

tant because use of the wrong calculation mode may

result in an inaccurate alarm. The BatteryStatus function

is used by the power management system to get alarm

and status bits, as well as error codes, from the Smart

Battery. This is basically the same information returned

by the SBData AlarmWarning function except that the

AlarmWarning function sets the error code bits all high

before sending the data. Also, information broadcasting

is disabled in the PS501.

Battery Status Bits:

bit 15:

OVER_CHARGED_ALARM

bit 14:

TERMINATE_CHARGE_ALARM

bit 13:

Reserved

bit 12:

OVER_TEMP_ALARM

bit 11:

TERMINATE_DISCHARGE_ALARM

bit 10:

Reserved

bit 9:

REMAINING_CAPACITY_ALARM

bit 8:

REMAINING_TIME_ALARM

bit 7:

INITIALIZED

bit 6:

DISCHARGING

bit 5:

FULLY_CHARGED

bit 4:

FULLY_DISCHARGED

The Host system assumes responsibility for detecting

and responding to Smart Battery alarms by reading the

BatteryStatus to determine if any of the alarm bit flags

are set. At a minimum, this requires the system to poll

the Smart Battery BatteryStatus every 10 seconds at all

times the SMBus is active.

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