FAQ

    Battery       MCU
  • 1-cell Lithium-ion battery protection IC.
  • 01. What is the voltage of OC and OD pin of Li-ion battery protection IC under variant conditions?
    Under normal condition, the OC and OD pins output at high voltage level. When overcharge protection or abnormal charge current are detected, the output voltage of OC pin changes to low voltage while OD pin remains high voltage. On the other hand, when overdischarge protection, discharge overcurrent or short-circuiting are detected, the OC pin remains high voltage while OD pin changes to low voltage from high voltage.

    02. Can overcharge condition be released when HY2110 series are in the overcharge protection mode and the charger is still connected?
    Yes, if battery voltage falls lower than overcharge release voltage (VDD<VCR), the overcharge condition can be released when the charger is still being connected.

    03. Can overcharge condition be released when HY2111 series are in overcharge protection mode and the charger is still connected?
    No, the overcharge status will not be released when a charger is still being connected after overcharge detection, even the battery voltage is below than overcharge release voltage (VCR). The overcharge status is released when the CS pin voltage goes over the charge overcurrent detection voltage (VCIP) by removing the charger.

    04. Can overdischarge condition be released when it is in the overdischarge protection mode and battery voltage restore to overdischarge release voltage (VDR)?
    No, the overdischarge condition only can be released by charging the battery. (When it is in the overdischarge condition, the CS pin voltage is pulled up by the internal resistor to VDD in the IC. At this time, power consumption is minimum, which is below 0.1uA. The IC enters into SLEEP MODE”, only charging the battery can relieve this mode.)

    05. How to calculate the discharge overcurrent threshold?
    The discharge overcurrent threshold is calculated by: IDIP = VDIP / RON.   (1)

    Where IDIP is the discharge overcurrent threshold current, VDIP is the discharge overcurrent detection voltage, and RON is the sum of internal resistance of M1 and M2 MOSFET.

    For example, VDIP is 150mV (typ.), and RON is 50mΩ, Then, IDIP is 3A.

    06. How to measure the maximum current for abnormal charge current detection of HY2110 series?
    The maximum current for abnormal charge current is calculated by ICHA=︱VCHA︱/ RON﹒   (2)

    Where ICHA is the maximum current for abnormal charge current, VCHA is the charger detection voltage. RON is the sum of internal resistance of M1 and M2 MOSFET.

    HY2110-AB for instance, VCHA is -0.3V (typ.), and RON is 50mΩ. Then, ICIP is 6A.

    07. How to measure the maximum current for charge overcurrent detection of HY2111 series?
    The maximum current for charge overcurrent is calculated by ICIP=︱VCIP︱/ RON﹒   (3)

    Where ICIP is the maximum current for charge overcurrent, VCIP is the charge overcurrent detection voltage. RON is the sum of internal resistance of M1 and M2 MOSFET.

    HY2111-EB for example, VCIP is -0.1V (typ.) and RON is 50mΩ. Then, ICIP is 2A.

    08. What is the release condition of HY2110 series for discharge overcurrent condition or load short-circuiting condition?
    After HY2110 series enter into discharge overcurrent condition or load short-circuiting condition, when the impedance between PB+ and PB- is greater than 1.4MΩ (typ.), both conditions will be released.

    09. What is the release condition of HY2111 series for discharge overcurrent condition or load short-circuiting condition?
    After HY2111 series enter into discharge overcurrent condition or load short-circuiting condition, when the impedance between PB+ and PB- is higher than [(150mV/VDIP)*450kΩ] (typ.), the discharge overcurrent condition or load short-circuiting condition will be released.

    10. What is the DS pin’s function?
    In order to shorten testing time for production, the DS pin can decrease IC's overcharge delay time within 10ms by connecting it to VDD pin. In normal protection circuit application, it is recommended to suspend the DS pin or connected to the VSS pin.

    11. What is the operating temperature range of lithium-ion battery packs protection IC?
    The normal operation temperature range is -40~85℃.

    12. Are PCBs for “0V battery charging function permitted” HY2110-AB and “0V battery charging function prohibited” HY2110-AB interchangeable?
    Yes, PCBs for “0V battery charging function permitted” IC and “0V battery charging function prohibited” IC are interchangeable. The periphery circuits of ICs are the same.

    13. What is the function for external resistor and capacitor which connected to the VDD pin? Does they affect the delay time of detection function?
    The external resistor (R1) limits current enter the VDD pin and enhances the ESD protection function. The external capacitor (C1) can prevent VDD voltage fluctuation.

    No, both of R1 and C1 do not affect the delay time of detection function.

    14.What is the selective range of the lithium-ion battery packs protection IC’s external resistor, R1?
    It is advised to set R1 resistance between 100~470Ω. Due to current consumption, R1 should be as small as possible to avoid lowering the overcharge detection accuracy. When a charger is connected in reversed, the current flows from the charger to the IC. At this time, if R1 is connected to high resistance, the voltage between VDD pin and VSS pin may exceed the absolute maximum rating.
    15. What is the selective range of the lithium-ion battery packs protection IC’s external resistor, R2?
    R2 resistance should be set between 300Ω~2k.If R2 ascends higher than 2kΩ, the charging current may not be cut off when a high-voltage charger is connected. Please select as large a resistance as possible to prevent current when a charger is connected in reversed.

    16. Why HY2110-AB overcharge release voltage (VCR) usually exceeds standard when using TestPad PTS-2008 tester under precision test mode?
    HY2110-AB overcharge condition can be released by the following cases:
    (1) When battery cell voltage equals to or lowers than that of overcharge release voltage (VCR) due to self-discharge.
    (2) When load is connected and the battery voltage falls below than overcharge protection voltage (VCU).

    When TestPad PTS-2008 tester experiments overcharge release voltage (VCR), charging and discharging process is alternate. At this stage, overcharge condition will be released if HY2110-AB detects VDD < VCU while discharging. Under this circumstance, possibilities of misjudgment exist because VCU has not truly being detected yet.

    For detail information, please refer to TestPad website. (Documentation:《FAQ of TestPad PTS-2008 for abnormal overcharge release and overdischarge release testing》.

    It is suggested to screen out this item while testing.

    17. Why using TestPad PTS-2008 tester under precision test mode, HY2110-AB overdischarge release voltage shows “charge” instead of displaying real value?
    TestPad PTS-2008 tester’s testing method of overdischarge release voltage cannot correctly examine the real value of the protection ICs which required a charger to release the overdischarge voltage condition.

    For detail information, please refer to TestPad website. (Documentation:《FAQ of TestPad PTS-2008 for abnormal overcharge release and overdischarge release testing》.

    It is suggested to screen out this item while testing.

    18. What is the notice of implementing Cyoshin CS583M+tester for protection IC testing?
    Firstly, set overcharge delay time parameters to meet the greatest value depicted in HY2110-AB datasheet. Secondly, it is recommended to take instrument inaccuracies into account.

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