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LP3958TLX Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LP3958TLX Datasheet(HTML) 3 Page - National Semiconductor (TI) |
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3 / 28 page  Connection Diagrams and Package Mark Information (Continued) PIN DESCRIPTIONS Pin # Name Type Description 5E SW Output Boost Converter Power Switch 5D FB Input Boost Converter Feedback 5C KEY1 Output Keypad LED Output 1 (Current Sink) 5B KEY2 Output Keypad LED Output 2 (Current Sink) 5A KEY3 Output Keypad LED Output 3 (Current Sink) 4E GND_SW Ground Power Switch Ground 4D NRST Input External Reset, Active Low 4C SCL Logic Input Clock Input for I 2C Compatible Interface 4B IKEY Input External Keypad LED Maximum Current Set Resistor 4A GND_KEY Ground Ground for KEY LED Currents 3E VDD2 Power Supply Voltage 3.0...5.5 V 3D VDDIO Power Supply Voltage for Digital Input/Output Buffers and Drivers 3C SDA Logic Input/Output Data Input/Output for I 2C Compatible Interface 3B GPIO[2] Logic Input/Output General Purpose Logic Input/Output 3A GPIO[0] / PWM Logic Input/Output General Purpose Logic Input/Output / External PWM Input 2E GND_WLED Ground Ground for White LED Currents (MAIN and SUB Outputs) 2D GNDT Ground Ground 2C VDD1 Power Supply Voltage 3.0...5.5 V 2B VREF Output Reference Voltage (1.23V) 2A GPIO[1] Logic Input/Output General Purpose Logic Input/Output 1E MAIN Output MAIN Display White LED Current Output (Current Sink) 1D SUB Output SUB Display White LED Current Output (Current Sink) 1C VDDA Output Internal LDO Output (2.80V) 1B GND Ground Ground for Core Circuitry 1A IRT Input Oscillator Frequency Set Resistor www.national.com 3 |
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