lm2755tmx National Semiconductor Corporation, lm2755tmx Datasheet - Page 9

• Manufacturer Part Number: lm2755tmx
• Description: Charge Pump Led Controller With I2c Compatible Interface In Micro Smd
• Manufacturer: National Semiconductor Corporation

INTERNAL REGISTERS OF LM2755
General Purpose Register Description
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Bit 0: enable output D1 with high current level.
Bit 1: enable output D2 with high current level.
Bit 2: enable output D3 with high current level.
Bit 3: enable dimming waveform on output D1.
Bit 4: enable dimming waveform on output D2.
Bit 5: enable dimming waveform on output D3.
Bit 6: enable external clock. '1' = External Clock Sync, '0' = Internal Clock Used
Bit 7: If Bit 7 = 0 the charge pump is powered on before any dimming waveform is enabled. If Bit7 = 1 the dimming waveform
can be enabled before charge pump is powered on.
Register Name
General Purpose
Time Step
D1 High Level
D1 Low Level
D1 Delay: t
D1 Ramp-Up Step Time: t
D1 Time High: t
D1 Ramp-Down Step Time: t
D1 Timing: t
D2 High Level
D2 Low Level
D2 Delay: tdelay
D2 Ramp-Up Step Time: t
D2 Time High: t
D2 Ramp-Down Step Time: t
D2 Timing: t
D3 High Level
D3 Low Level
D3 Delay: tdelay
D3 Ramp-Up Step Time: t
D3 Time High: t
D3 Ramp-Down Step Time: t
D3 Timing: t
delay
low
low
low
high
high
high
rise
rise
rise
fall
fall
fall
Dimming Waveform
FIGURE 4.
9
Internal Hex
Address
xC9
xC8
xC1
xC5
xC3
xC4
xC2
x10
x20
xA9
xA8
xA1
xA5
xA3
xA4
xA2
xB9
xB8
xB1
xB5
xB3
xB4
xB2
Power On Value
0000 0000
1000 1000
1110 0000
1110 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
1110 0000
1110 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
1110 0000
1110 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
20180903
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