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| LM3697_15 Datasheet, PDF (7/43 Pages) Texas Instruments – High-Efficiency Three-String White LED Driver | |||
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www.ti.com
LM3697
SNOSCS2C â NOVEMBER 2013 â REVISED OCTOBER 2015
Electrical Characteristics (continued)
Limits apply over the full operating ambient temperature range (â40°C ⤠TA ⤠85°C) and VIN = 3.6 V, unless otherwise
specified.(1)(2)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
PWM INPUT
VPWM_L
Input logic low
2.7 V ⤠VIN ⤠5.5 V
VPWM_H
Input logic high
2.7V ⤠VIN ⤠5.5 V
tPWM
Minimum PWM input pulse
2.7 V ⤠VIN ⤠5.5 V, PWM zero detect enabled
I2C-COMPATIBLE VOLTAGE SPECIFICATIONS (SCL, SDA)
0
1.31
0.4
V
VIN
0.75 µs
VIL
Input logic low
2.7 V ⤠VIN ⤠5.5 V
VIH
Input logic high
2.7 V ⤠VIN ⤠5.5 V
VOL
Output logic low (SDA)
2.7 V ⤠VIN ⤠5.5 V, ILOAD = 3 mA
0
1.29
0.4
V
VIN
400 mV
6.6 Timing Requirements
I2C-COMPATIBLE TIMING SPECIFICATIONS (SCL, SDA)(1)
t1
SCL (clock period)
2.7 V ⤠VIN ⤠5.5 V
t2
Data In set-up time to SCL high
2.7 V ⤠VIN ⤠5.5 V
t3
Data out stable after SCL low
2.7 V ⤠VIN ⤠5.5 V
t4
SDA low set-up time to SCL low (start)
2.7 V ⤠VIN ⤠5.5 V
t5
SDA high hold time after SCL high (stop)
2.7 V ⤠VIN ⤠5.5 V
INTERNAL POR THRESHOLD AND HWEN TIMING SPECIFICATION
VPOR
POR reset release voltage threshold
VIN ramp time = 100 µs
VIN ramp time = 100 µs, TA =
25°C
tHWEN
First I2C start pulse after HWEN high
2.7 V ⤠VIN ⤠5.5 V, POR
reset complete
POR reset complete, TA =
25°C
(1) SCL and SDA must be glitch-free in order for proper brightness control to be realized.
t1
MIN
NOM
MAX UNIT
2.5
µs
100
ns
0
ns
100
ns
100
ns
1.7
2.1
V
1.9
20
µs
5.0
SCL
t4
t5
SDA_IN
t2
SDA_OUT
t3
Figure 1. I2C-Compatible Interface Timing
Copyright © 2013â2015, Texas Instruments Incorporated
Product Folder Links: LM3697
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