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SC802AIMLTRT Datasheet(PDF) 7 Page - Semtech Corporation |
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SC802AIMLTRT Datasheet(HTML) 7 Page - Semtech Corporation |
7 / 18 page © 2008 Semtech Corporation SC802/SC802A 7 Pin Descriptions Pin # Pin Name Pin Function 1 BSEN Battery voltage sense pin — Connect to battery terminal to Kelvin sense battery voltage, to a resistor divider network for adjustable output voltage, or to VOUT otherwise. Do not leave this pin floating. 2 VPRGM Selectable voltage program pin — Logic low = 4.1V; Logic high = 4.2V; Resistor = adjustable. 3 IPRGM Charger current program pin in fast-charge mode — Requires a resistor to ground to program fast-charge current. 4 ITERM Selection for current termination and pre-charge current — Requires a resistor to ground to pro- gram pre-charge and termination current. 5 REFGND Reference ground — Allows Kelvin connection to battery negative terminal. 6 GND Ground 7 EN_NTC Combined device enable/disable and NTC input pin — Logic high enables device; logic low dis- ables device. Analog voltages between 0.3×V VCC and 0.75×V VCC enable the NTC function. 8 BIPB Battery In Place Bar (BIPB) — selects Charge/LDO mode. BIPB = Low selects charge mode. BIPB = High selects LDO mode which disables Pre-Charge and timer functions 9 AFC Analog fast-charge setting — Connect to DAC for analog control of fast-charge current value. Connect to VCC to disable AFC. Do not leave open. 10 CHRGB Open drain charger status pin — The output is active low when the charger is on and I VOUT > I TERM . The CHRGB output switches to high impedance when I VOUT < I TERM . This pin can sink 10mA. 11 CPB Open Drain Charger present indicator — The output is active low when the V VCC exceeds VT UVLOR . This pin can sink 10mA. 12 RTIME Programmable timer input pin — Connect to VCC to select the internal time-out of 3hrs. Connect an external resistor to ground to program the timeout period. Connect to ground to disable the timer. 13 VCC1 Supply pin — Connect to adaptor power and to VCC2. (1) 14 VCC2 Supply pin — Connect to adaptor power and to VCC1. (1) 15 VOUT1 Charger output — Connect to battery and to VOUT2. (2) 16 VOUT2 Charger output — Connect to battery and to VOUT1. (2) T Thermal Pad Pad is for heatsinking purposes — The thermal pad is not connected internally. Connect exposed pad to ground plane using multiple vias. Notes: (1) VCC1 and VCC2 must be connected. VCC1 and VCC2 will be referred to collectively as VCC. All references to V VCC and I VCC refer to the common node voltage and total current of VCC1 and VCC2. (2) VOUT1 and VOUT2 must be connected. VOUT1 and VOUT2 will be referred to collectively as VOUT. All references to V VOUT and I VOUT refer to the common node voltage and total current of VOUT1 and VOUT2. |
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