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MCP73853 Datasheet(PDF) 11 Page - Microchip Technology |
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MCP73853 Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 32 page  2004-2013 Microchip Technology Inc. DS21915C-page 11 MCP73853/55 3.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE 3.1 Voltage Regulation Selection (VSET) Connect to VSS for 4.1V regulation voltage. Connect to VDD for 4.2V regulation voltage. 3.2 Battery Management Input Supply (VDD1, VDD2) A supply voltage of [VREG(Typ) + 0.3V] to 5.5V is recommended. Bypass to VSS with a minimum of 4.7 µF. 3.3 Battery Management 0V Reference (VSS1, VSS2, VSS3) Connect to negative terminal of battery. 3.4 Current Regulation Set (PROG) Preconditioning, fast and termination currents are scaled by placing a resistor from PROG to VSS. 3.5 Cell Temperature Sensor Bias (THREF) THREF is a voltage reference to bias external thermistor for continuous cell temperature monitoring and pre-qualification. 3.6 Cell Temperature Sensor Input (THERM) Input for an external thermistor for continuous cell- temperature monitoring and prequalification. Connect to THREF/3 to disable temperature sensing. 3.7 Timer Set (TIMER) All safety timers are scaled by CTIMER/0.1 µF. 3.8 Battery Charge Control Output (VBAT1, VBAT2) Connect to positive terminal of battery. Drain terminal of internal P-channel MOSFET pass transistor. Bypass to VSS with a minimum of 4.7 µF to ensure loop stability when the battery is disconnected. 3.9 Battery Voltage Sense (VBAT3) Voltage sense input. Connect to positive terminal of battery. A precision internal resistor divider regulates the final voltage on this pin to VREG. 3.10 Logic Enable (EN) Input to force charge termination, initiate charge, clear faults or disable automatic recharge. 3.11 Fault Status Output (STAT2) Current-limited, open-drain drive for direct connection to an LED for charge status indication. Alternatively, a pull-up resistor can be applied for interfacing to a host microcontroller. 3.12 Charge Status Output (STAT1) Current-limited, open-drain drive for direct connection to a LED for charge status indication. Alternatively, a pull-up resistor can be applied for interfacing to a host microcontroller. MCP73853 MCP73855 Sym Description 12 VSET Voltage Regulation Selection 23 VDD1 Battery Management Input Supply 3— VDD2 Battery Management Input Supply 44 VSS1 Battery Management 0V Reference 5 5 PROG Current Regulation Set 6 — THREF Cell Temperature Sensor Bias 7 — THERM Cell Temperature Sensor Input 86 TIMER Timer Set 9— VSS3 Battery Management 0V Reference 10 8 VBAT1 Battery Charge Control Output 11 9 VBAT2 Battery Charge Control Output 12 — VBAT3 Battery Voltage Sense 13 7 VSS2 Battery Management 0V Reference 14 10 EN Logic Enable 15 — STAT2 Fault Status Output 16 1 STAT1 Charge Status Output 17 11 EP Exposed Pad, VSS Potential |
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