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LTC3220EPF-TRPBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC3220EPF-TRPBF Datasheet(HTML) 6 Page - Linear Technology |
6 / 20 page LTC3220/LTC3220-1 6 32201fc PIN FUNCTIONS TYPICAL PERFORMANCE CHARACTERISTICS T A = 25°C unless otherwise noted. 18-LED ULED Display Efficiency vs VIN Voltage ULED1-ULED18 (Pins 1-9,13-21): Current Source Outputs for Driving LEDs. The LED current can be set from 0mA to 20mA in 64 steps via software control and internal 6-bit linear DAC. Each output can be disabled by setting the associated data register REG1 to REG18 low. ULED1 to ULED18 can also be used as I2C controlled open-drain general purpose outputs. Connect unused outputs to ground. DVCC (Pin 10): Supply Voltage for All digital I/O lines. This pin sets the logic reference level of the LTC3220/LTC3220-1. DVCC will reset the data registers when set below the undervoltage lockout threshold. A 0.1μF X5R or X7R ceramic capacitor should be connected to ground. SCL (Pin 11): I2C Clock Input. The logic level for SCL is referenced to DVCC. ULED Current vs Input Code INPUT CODE (HEX) 009 0 10 25 12 24 2D 3220 G16 5 20 15 1B 36 3F VIN VOLTAGE (V) 2.9 100 10 90 70 50 30 80 60 40 20 0 4.525 3.875 5.175 3220 G17 5.5 4.2 3.55 4.85 3.225 1.5x Mode VIN Current vs ICPO (IVIN – 1.5ICPO) 2x Mode VIN Current vs ICPO (IVIN – 2ICPO) ULED Pin Current vs ULED Pin Voltage ICPO (mA) 0 6 8 10 180 300 3220 G13 4 2 0 60 120 240 12 14 16 360 ICPO (mA) 0 14 12 10 8 6 4 2 0 180 300 3220 G14 60 120 240 360 ULED PIN VOLTAGE (V) 0 10 15 0.2 3220 G15 5 0 0.05 0.1 0.15 25 20 |
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