LM3555TLE Datasheet, PDF (19/33 Pages) Texas Instruments – LM3555 Synchronous Boost Converter with 500 mA High Side LED Driver and Dual-Mode Control Interface

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LM3555
SNVS594E – JANUARY 2009 – REVISED NOVEMBER 2011
ack from slave
ack from slave
ack from slave
start msb Chip Address lsb w ack msb Register Add lsb ack msb DATA lsb
ack stop
SCL
SDIO
start
Id = 30h
w ack
addr = 04h
ack
w = write (SDA = "0")
ack = acknowledge (SDA pulled down by the slave)
id = chip address, 30h for LM3555
Figure 3. Write Cycle
data = 08h
I²C-COMPATIBLE CHIP ADDRESS
The chip address for LM3555 is 0110000, or 30hex.
MSB
LSB
ADR6 ADR5 ADR4 ADR3 ADR2 ADR1 ADR0 R/W
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
0
1
1
0
0
0
0
I²C Slave Address (chip address)
INTERNAL REGISTERS OF LM3555
Register
Version Control Register
Indicator and Timer Register
Current Set Register
Control Register
Fault Register
Internal Hex Address
0x01
0x02
0x03
0x04
0x05
REGISTER DEFINITIONS
BOLD TABLE VALUES = Default Register Settings
Version Control Register
Address: 0x01
Definition: RF3 RF2 RF1 RF1 DR3 DR2 DR1 DR0
Default: 0 0 0 0 # # # #
RF3–RF0: Unused
DR3–DR0: Design Revision = 1100
Indicator and Timer Register
Address: 0x02
Definition: IC1 IC0 VO1 VO0 FT3 FT2 FT1 FT0
Default: 0 0 0 0 1 1 1 1
IC1–IC0: Indicator LED current control bits.
VO1-VO0: V_REF Offset Adjustment bits. Used for diode detection.
FT3-FT0: Software Flash Timer Duration Control bits.
ack stop
Power On Value
0000 1100
0000 1111
0110 1001
1011 0100
0000 1000
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