LM3697_15 Datasheet, PDF (19/43 Pages) Texas Instruments – High-Efficiency Three-String White LED Driver

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Reserved
LM3697
SNOSCS2C – NOVEMBER 2013 – REVISED OCTOBER 2015
Table 10. Control A and B Full-Scale Current Setting (Address 0x17 and 0x18)
Bits [7:5]
Not Used
Bits [4:0]
Control A, B Full-Scale Current Select Bits
00000 = 5 mA
10011 = 20.2 mA (default)
11111 = 29.8 mA
(0.8 mA steps, FS = 5 + code * 0.8 mA)
Bits [7:3]
Not Used
Reserved
Table 11. HVLED Current Sink Feedback Enables (Address 0x19)
Bit [2]
HVLED3 Feedback Enable
0 = LED anode is NOT CONNECTED
to COUT
1 = LED anode is CONNECTED to
COUT (default)
Bit [1]
HVLED2 Feedback Enable
0 = LED anode is NOT CONNECTED
to COUT
1 = LED anode is CONNECTED to
COUT (default)
Bit [0]
HVLED1 Feedback Enable
0 = LED anode is NOT CONNECTED
to COUT
1 = LED anode is CONNECTED to
COUT (default)
Bits [7:5]
Not Used
Reserved
Table 12. Boost Control (Address 0x1A)
Bit [4]
Auto-Headroom Enable
0 = Disable (default)
1 = Enable
Bit [3]
Auto-Frequency Enable
0 = Disable (default)
1 = Enable
Bits [2:1]
Boost OVP Select
00 = 16 V (default)
01 = 24 V
10 = 32 V
11 = 40 V
Bit [0]
Boost Frequency Select
0 = 500 kHz (default)
1 = 1 MHz
Table 13. Auto-Frequency Threshold (Address 0x1B)
Auto-Frequency Threshold (default = 11001111)
Bits [7:0]
Bits [7:4]
Not Used
Reserved
Table 14. PWM Configuration (Address 0x1C)
Bit [3]
PWM Zero Detection
Enable
0 = Disable
1 = Enable (default)
Bit [2]
PWM Polarity
0 = Active Low
1 = Active High (default)
Bit [1]
Bit [0]
Control B PWM Enable Control A PWM Enable
0 = Disable (default)
1 = Enable
0 = Disable (default)
1 = Enable
Reserved
Table 15. Control A Brightness LSB (Address 0x20)
Bits [7:3]
Not Used
Brightness LSB
Bits [2:0]
Control A Brightness [2:0]
Table 16. Control A Brightness MSB (Address 0x21)
Bits [7:0]
Control A Brightness [11:3]
Brightness MSB
(LED current ramping does not start until the MSB is written, LSB must always be written before MSB)
Reserved
Table 17. Control B Brightness LSB (Address 0x22)
Bits [7:3]
Not Used
Brightness LSB
Bits [2:0]
Control B Brightness [2:0]
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