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ACT2823 Datasheet(PDF) 16 Page - Active-Semi, Inc |
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ACT2823 Datasheet(HTML) 16 Page - Active-Semi, Inc |
16 / 25 page ACT2823 REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. 16 ) 5 ( ) ( ) ( 2160 ) ( k R m R I k mV V IMC CS BAT IMC As an example, if RCS=50mΩ, RIMC=216kΩ, and the battery charging current is 1.5A, then the ACT2813 increases the LED voltage threshold by 750mV. LED Hysteresis Window Setting The LED Hysteresis Window compensates for the increase and decrease in battery voltage associated with charging and discharging. It provides fixed voltage adjustment to the LED threshold settings. When in the battery is charging, the LED threshold settings are increased by the LED hysteresis voltage. When the battery is discharging, the LED threshold settings are decreased by the LED hysteresis voltage. This setting has no effect in HZ Mode. Connecting a resistor between the HYST pin and AGND program the hysteresis between adjusts for battery impedances between 0mV and 720mV. Note that the ACT2823 has 100mV of built in hysteresis that cannot be changed. The following equations calculate the proper RHYST resistance. Note that LED1 and LED2 use one equation while LED3 and LED4 use another equation. ) 6 ( ) ( 32.4k k R 2 : 1 :2 1 HYST V V HYST ) 7 ( ) ( 27k k R 4 : 3 :4 3 HYST V V HYST Where VHYST is the desired LED hysteresis in volts. RHYST(1) = 54kΩ to set LED1 hysteresis equal to 600mV. RHYST(3) = 45kΩ to set LED3 hysteresis equal to 600mV. The following table provides RHYSTvalues for different hysteresis voltages. RHYST (kΩ) LED1 VHYST LED2 VHYST LED3 VHYST LED4 VHYST Floating 0mV 0mV 0mV 0mV 270 120mV 120mV 100mV 100mV 135 240mV 240mV 200mV 200mV 90 360mV 360mV 300mV 300mV 67.5 480mV 480mV 400mV 400mV 54 600mV 600mV 500mV 500mV 45 720mV 720mV 600mV 600mV LED Trigger Voltage The battery voltage that triggers each LED to turn on and off is a function of the LED voltage threshold, the impedance compensation voltage, the LED hysteresis setting, and whether the battery is charging or discharging. The figure below graphically shows the LED trip points as a function of these inputs. Charging LED Threshold - Rising Charging LED Threshold - Falling Discharging LED Threshold - Rising Discharging LED Threshold - Falling VIMC VHYST VIMC VHYST 100mV Internal Hysteresis 100mV Internal Hysteresis VLEDx Figure 6: LED threshold setting BATTERY TEMPERATURE MONITERING The ACT2823 monitors the battery pack temperature by measuring the voltage at the TH pin. The TH pin is connected to the thermistor resistor network which includes a negative temperature coefficient thermistor. An internal current source provides a bias current to generate a voltage on the TH pin. The ACT2823 compares the voltage at the TH pin with the internal VTHH and VTHL thresholds to determine if charging or discharging is allowed. Charging latches off and triggers a fault in the I2C register 0x08h when VTH<VTHL or VTH >VTHH. Charging cannot be started until the fault condition goes away. After VTH returns to the normal range, one of the following three conditions can restart charging. 1. Assert PB when the latch off bit in register 0x05h = 0 2. Clear the fault status bits in register 0x08h standby 3. Recycle input power + – + – TH VTCL=1V NTC VTCH=2.5V + – + – VTDL=0.57V VTDH=2.5V IDIS=100 uA ICHG=140uA ACT2823 CHG_HOT CHG_COLD DIS_HOT DIS_COLD Rb Ra Li+ Battery Pack Figure 7: Thermistor Resistor Network RNTCc : NTC Resistor at cold temperature (Tcold) RNTCh : NTC Resistor at hot temperature (Thot) |
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Similar Description - ACT2823 |
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