PS810 datasheet(30/46 Pages) MICROCHIP

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PS810

DS21904C-page 30

8.3.1

Temperature (0.1° CELSIUS)

Returns the cell pack’s internal temperature.

8.3.2

Voltage (mV)

Returns the pack voltage.

8.3.3

Current (mA)

Returns the current being supplied (or accepted)

through the battery’s terminals.

8.3.4

AverageCurrent (mA)

Returns a rolling average of the current being supplied

(or accepted) through the battery’s terminals. The time

period over which current is averaged is adjustable.

8.3.5

RelativeStateOfCharge (%)

Returns the predicted remaining battery capacity

expressed as a percentage of FullChargeCapacity.

8.3.6

AbsoluteStateOfCharge (%)

Returns the predicted remaining battery capacity

expressed as a percentage of DesignCapacity. Note

that AbsoluteStateOfCharge can return values greater

than 100%.

8.3.7

RemainingCapacity (mAh)

Returns the predicted remaining battery capacity.

The RemainingCapacity value is expressed as:

Current x Time.

8.3.8

FullChargeCapacity (mAh)

Returns the predicted pack capacity when it is fully

charged.

8.3.9

AverageTimeToEmpty (MINUTES)

Returns a rolling average of the predicted remaining

battery life. The time period over which it is averaged is

the same as AverageCurrent.

8.3.10

BatteryStatus (FLAGS)

Returns

the

Smart

Battery’s

status

word.

The

BatteryStatus function is used by the power management

system to get alarm and status bits.

Battery Status Bits:

bit 7:

INITIALIZED

bit 6:

DISCHARGING

bit 5:

FULLY_CHARGED

bit 4:

FULLY_DISCHARGED

bit 3:

OVER_TEMP_ALARM

bit 2:

Unused

bit 1:

KEELOQ response processing

bit 0:

COIN_CELL_EMPTY

8.3.11

CycleCount (INTEGER)

CycleCount is updated to keep track of the total usage

of the battery. CycleCount is increased whenever an

amount of charge has been removed from the battery

equivalent to the full capacity.

8.3.12

DesignCapacity (mAh)

Returns the theoretical capacity of a new pack.

8.3.13

CoinCellVoltage (mV)

Returns the voltage of the coin cell.

8.3.14

ManufactureDate (CODE)

This function returns the date the pack was manu-

factured in a coded integer. The date is packed in the

following fashion: (year-1980) * 512 + month * 32 + day.

8.3.15

SerialNumber (HEX WORD)

This function is used to return a serial number. This

number, when combined with the ManufacturerID, the

DeviceID and the ManufactureDate, will uniquely

identify the battery.

8.3.16

ManufacturerID (HEX WORD)

This function returns a hex word containing the battery

manufacturer’s ID.

8.3.17

DeviceID (HEX WORD)

This function returns a hex word that contains the

battery’s ID.

8.3.18

KEELOQ (BLOCK DATA)

This function is used for identification of the battery to

the system. The host system writes a 4-byte challenge

of random data to the battery. The PS810 runs the

challenge data through the KEELOQ algorithm using a

safe key entered at time of manufacture. (An option is

to have this key based on a manufacturer’s key and the

serial number.) The host then reads the 4-byte

response and compares it with an internally generated

response using the same key. The responses must

match for validation.

8.3.19

UserData (BLOCK DATA)

Reads 1 to 32 bytes from the UserData block in Flash.

The number of bytes read is determined by parameter

UserDataLen. This is a general purpose storage of any

information a user may want to read.

Note:

This command is only available in SMBus

mode, not SPS mode.

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