Cypress CY8C29x66, AN2309, CY8C24794 specifications Two-Cell Battery Charger Parameters

AN2309

Two-Cell Battery Charger Parameters

All two-cell battery charger parameters are located in the header file globdefs.h in the project folder. The header file globdefs.h contains the following parameters:

Table 2. Two-Cell Battery Charger Parameters

Parameter	Unit	Description
Charging Parameters
Vrs	V	Rapid-Charge Stage Start Condition
Vrap	V	Full Charge Voltage (Constant Charge Voltage)
Vcrst	V	Recharge Voltage
Vbmax	V	Emergency Shutdown Voltage
Vfull_disch	V	Full Discharge Voltage
Iact	A	Activation Stage Charge Current
Irap	A	Rapid-Charge Stage Current
Ichmax	A	Emergency Shutdown Current
Irtn	A	Charge Termination Current
		Timing Requirements
TACT	second	Time Limit for Battery Activation Period
TRAPID	second	Time Limit for Final Stage of Constant Charge Mode Voltage
TCHARGE	second	Time Limit for Total Charge Period
TTERM	second	Minimum Time for Charge Complete (when Ich ≤ Irtn)
Thermistor Measurement Requirements
RTERM_CH_COLD_STOP	Ohms	Thermistor Resistance for Cold Stop Battery Charge
RTERM_CH_COLD_RESTART	Ohms	Thermistor Resistance for Cold Restart Battery Charge
RTERM_CH_HOT_STOP	Ohms	Thermistor Resistance for Hot Stop Battery Charge
RTERM_CH_HOT_RESTART	Ohms	Thermistor Resistance for Hot Restart Battery Charge
RTERM_DISCH_COLD_STOP	Ohms	Thermistor Resistance for Cold Stop Battery Discharge
RTERM_DISCH_HOT_STOP	Ohms	Thermistor Resistance for Hot Stop Battery Discharge
		Schematic Parameters
CURRENT_SENSE_R	Ohms	Current-Sense Resistor
TEMPERATURE_R_REF	Ohms	Thermistor Reference Resistor

November 25, 2007 Document No. 001-17394 Rev. *B - 16 -

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