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NCP1840
I 2 C TIMING CHARACTERISTICS (T J = 25 ° C unless otherwise specified)
Parameter
Symbol
Min
Max
Unit
SCL Clock Frequency
SCL Low Time
SCL High Time
Start Hold Time
Data Hold Time
Start Setup Time
Data Setup Time
Stop Setup Time
Bus Free Time (Stop and Start Conditions)
f SCL
t LOW
t HIGH
t HD;STA
t HD;DAT
t SU;STA
t SU;DAT
t SU;STO
t BUF
1.3
0.6
0.6
0.6
100
0.6
1.3
400
0.9
kHz
m s
m s
m s
m s
m s
m s
m s
m s
Rise Time (SCL and SDA)
Fall Time (SCL and SDA)
t R
t F
10
10
300
300
ns
ns
TYPICAL PERFORMANCE CHARACTERISTICS (V BAT = 4.0 V, DV CC = 3.3 V,
I OUT = 160 mA (8 LEDs at 20 mA/ch), C IN = C OUT = 2.2 m F, C 1 = C 2 = 1 m F, T AMB = 25 ° C unless otherwise specified.)
100
100
V F = 3.25 V
90
V F = 3.25 V
1.5x
90
1.33x
80
70
80
70
1x
60
50
1x
1.33x
2x
60
50
40
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
40
4.2
4.0
3.8
3.6
3.4
3.2
3.0
VBAT VOLTAGE (V)
Figure 4. Efficiency vs. V BAT Voltage
http://onsemi.com
6
VBAT (Li ? Ion) VOLTAGE (V)
Figure 5. Efficiency vs. Li ? Ion Voltage
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