PS501 datasheet(28/42 Pages) MICROCHIP

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PS501

DS21818C-page 28

 2004 Microchip Technology Inc.

TABLE 9-4:

CHARGE CONTROL

Parameter

Name

Bytes

Lower

Limit

Upper

Limit

Typical

Value

Operational Description

ChrgCurr

65535

3000

This is the full charging current that the battery requires

during normal charging. It can be broadcasted to the charger

or read from the PS501.

ChrgCurrOff

65535

Trickle charging current. This is a small amount of current

that the charger should deliver when full charging needs to

be halted temporarily due to high temperature.

ChrgMaxTemp

255

235

Temperature threshold when charging,

Coded value = (Celsius * 10 + 200)/4. When the temperature

exceeds ChrgMaxTemp and the battery is charging, then

ChargingCurrent is set to ChrgCurrOff and ChargingVoltage

is set to ChrgVoltOff.

ChrgMinTemp

255

Low temperature threshold,

Charging coded value = (Celsius * 10 + 200)/4. When

charging, if the temperature is less than ChrgMinTemp, then

ChargingCurrent is set to ChrgCurrOff and

ChargingVoltage is set to ChrgVoltOff.

ChrgVolt

65535

16800

This is the voltage required by the battery during normal

charging.

ChrgVoltOff

65535

16800

Voltage required when charging should be halted.

ClrFullyChrg

255

Reset FULLY_CHARGED bit at this level, 100 = 100%. Once

the FULLY_CHARGED bit is set, taper or pulse current will

not be monitored any more. When discharging begins, the

FULLY_CHARGED bit must remain set until the cell voltages

are below EOC_VOLT so that a small current will not trigger

a false End-Of-Charge trigger. Thus, ClrFullyChrg is set at

about 90%. FULLY_CHARGED bit will be on until the battery

has discharged to less than 90%.

ClrFullyDischrg

255

Reset FULLY_DISCHARGED bit, 100 = 100%. Once fully

discharged bit is set, it will stay set until capacity rises above

this value, typically 10%.

EOCCurAvg

65535

200

EOC trigger for pulse charging. If the average current during

charging, with the CFET turned off, has dropped below the

AvgCurrEOCThresh threshold for a pass count equal to the

EEPROM parameter value ChrgCntrlTimr (typically

between 8 and 16), the End-Of-Charge state will be reached.

EOCRecheck

255

Delay filter for the EOC condition. Number of checks before

EOC trigger. The End-Of-Charge conditions must remain for

at least this number of periods before being considered true,

to help filter out false full conditions due to spikes.

EOCVolt

65535

4175

EOC trigger cell voltage. When any cell in the battery pack

reaches this voltage, the End-Of-Charge determination will

start monitoring the average current to determine when the

battery is full. When the average current is in the proper

range and the cell voltage is greater than EOC_VOLT, then

FULLY_CHARGED bit in BatteryStatus will be set and

terminate charge alarm will be active.

MaxTemp

65535

750

Maximum temperature measured (including external and

internal sensor). Coded value = (Celsius * 10 + 200)/4. This

is where the PS501 keeps track of the highest temperature it

has measured.

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