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MMPF0200 Datasheet(PDF) 81 Page - NXP Semiconductors |
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MMPF0200 Datasheet(HTML) 81 Page - NXP Semiconductors |
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81 / 114 page ![]() NXP Semiconductors 81 PF0200 FUNCTIONAL BLOCK REQUIREMENTS AND BEHAVIORS Coin cell charger control The coin cell charger circuit will function as a current-limited voltage source, resulting in the CC/CV taper characteristic typically used for rechargeable Lithium-Ion batteries. The coin cell charger is enabled via the COINCHEN bit while the coin cell voltage is programmable through the VCOIN[2:0] bits on register COINCTL on Table 97. The coin cell charger voltage is programmable. In the ON state, the charger current is fixed at ICOINHI. In Sleep and Standby modes, the charger current is reduced to a typical 10 μA. In the OFF state, coin cell charging is not available as the main battery could be depleted unnecessarily. The coin cell charging will be stopped when VIN is below UVDET. External components Coin cell specifications Table 96. Coin cell charger voltage VCOIN[2:0] VCOIN (V)(73) 000 2.50 001 2.70 010 2.80 011 2.90 100 3.00 101 3.10 110 3.20 111 3.30 Notes 73. Coin cell voltages selected based on the type of LICELL used on the system. Table 97. Register COINCTL - ADDR 0x1A Name Bit # R/W Default Description VCOIN 2:0 R/W 0x00 Coin cell charger output voltage selection. See Table 96 for all options selectable through these bits. COINCHEN 3 R/W 0x00 Enable or disable the Coin cell charger UNUSED 7:4 – 0x00 UNUSED Table 98. Coin cell charger external components Component Value Units LICELL Bypass Capacitor 100 nF Table 99. Coin cell charger specifications Parameter Typ Unit Voltage Accuracy 100 mV Coin Cell Charge Current in On mode ICOINHI 60 μA Current Accuracy 30 % |
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