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LTC3220/LTC3220-1
TYPICAL PERFORMANCE CHARACTERISTICS
T A = 25°C unless otherwise noted.
16
14
12
10
8
6
4
2
1.5x Mode V IN Current vs I CPO
(I VIN – 1.5I CPO )
14
12
10
8
6
4
2
2x Mode V IN Current vs I CPO
(I VIN – 2I CPO )
25
20
15
10
5
ULED Pin Current
vs ULED Pin Voltage
0
0
60
120
180
240
300
360
0
0
60
120
180
240
300
360
0
0
0.05
0.1
0.15
0.2
I CPO (mA)
3220 G13
I CPO (mA)
3220 G14
ULED PIN VOLTAGE (V)
3220 G15
18-LED ULED Display Ef?ciency
25
20
15
10
5
ULED Current vs Input Code
100
90
80
70
60
50
40
30
20
10
vs V IN Voltage
0
0
09
12
1B
24
2D
36
3F
0
2.9 3.225 3.55 3.875 4.2 4.525 4.85 5.175 5.5
INPUT CODE (HEX)
V IN VOLTAGE (V)
3220 G17
3220 G16
PIN FUNCTIONS
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 I 2 C controlled open-drain
general purpose outputs. Connect unused outputs to
ground.
DV CC (Pin 10): Supply Voltage for All digital I/O lines. This
pin sets the logic reference level of the LTC3220/LTC3220-1.
DV CC 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): I 2 C Clock Input. The logic level for SCL is
referenced to DV CC .
32201fc
6
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