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ISL6295CVZ Datasheet(PDF) 4 Page - Intersil Corporation |
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ISL6295CVZ Datasheet(HTML) 4 Page - Intersil Corporation |
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4 / 25 page  4 FN9074.2 February 8, 2011 Functional Pin Descriptions GPAD/IO1 (Pin 1) General purpose A/D input or general purpose input/output pin. Grounded if not used. VP (Pin 2) Cell input connection for the positive terminal of the Li-Ion cell. Connects to the positive terminal of 1-cell series packs. VP serves as the power supply input for the ISL6295. SCL (Pin 3) SMBus/I2C™ clock line connection SDA (Pin 4) SMBus/I2C™ data line connection ROSC (Pin 5) External bias resistor. 221k Ω (±0.1%) oscillator reference setting resistor connected between this pin and GND. NTC/IO0 (Pin 6) Connection for an external temperature sensor using a thermistor. Can also be configured as an open drain general purpose input/output pin. Grounded if not used. GND (Pin 7) Analog and digital ground SR (Pin 8) Current measurement A/D input. Connects to the other terminal of a grounded current sense resistor. Theory of Operation The ISL6295 contains a complete analog "front-end" for battery monitoring as well as digital logic for control, measurement accumulation, timing, and communications. Major functions within the ISL6295 include: • Voltage Regulator • Precision Time Base • Temperature Sensor • 256 Byte NV-EEPROM • 32 Byte general purpose SRAM • Analog-to-Digital (A/D) Converter • 32-bit Accumulators/Timers •SMBus/I2C™ Communications Interface Figure 2 is a block diagram of the internal circuitry of the ISL6295. Figure 1 is a schematic diagram that depicts the ISL6295 in a typical single cell Lithium-ion application. The function of each of the blocks listed above is summarized in the following sections. FIGURE 1. ISL6295 APPLICATIONS SCHEMATIC R5 0.020 1% GPAD 1 VP 2 SCL 3 SDA 4 ROSC 5 NTC 6 GND 7 SR 8 U1 ISL6295 2 3 6 7 Q1 SI6880EDQ R4 221K 0.1% PLACE THERMAL FUSE NEXT TO Q1 ON PCB LAYOUT R6 680 R7 680 C2 100nF C3 1.0nF F1 D1 CMSZDA5V6 R2 1K R1 1K C1 100nF 1 Cell + 1 J2 Cell - 1 J3B+ 1 J4 C 1 J5D 1 J6 B DOUT 1 VDD 5 VSS 6 DS 4 COUT 3 V- 2 U2 MM3077DN t RT1 THERMISTOR Note: Connect NTC pin to ground if thermister is not used ISL6295 |
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