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LM3553 Datasheet(PDF) 11 Page - Texas Instruments |
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LM3553 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 26 page 0 bit7 0 bit6 VFB bit5 1 bit4 1 bit3 VM bit2 EN1 bit1 EN0 bit0 MSB LSB General Purpose Control Register Address: 0x10 ADR6 bit7 ADR5 bit6 ADR4 bit5 ADR3 bit4 ADR2 bit3 ADR1 bit2 ADR0 bit1 R/W bit0 MSB LSB 1 0 1 0 1 0 1 I 2 C Slave Address (chip address) LM3553 www.ti.com SNVS414B – FEBRUARY 2008 – REVISED MAY 2013 INTERNAL REGISTERS OF LM3553 Register Internal Hex Address Power On Value General Purpose Register 0x10 0001 1000 Multi-Function Pin Control Register 0x20 1110 0000 Current Step Time Register 0x50 1111 1100 Torch Current Control Register 0xA0 1000 0000 Flash Current Control Register 0xB0 1000 0000 Flash Duration Control Register 0xC0 1111 0000 General Purpose Register EN0-EN1: Set Flash LED mode Indicator Mode sets ILED = 20mA. In this mode, D1 is enabled and D2 is disabled. VM: Enables Voltage Mode. Current sinks D1 and D2 are turned off and the LM3553 will operate in a regulated voltage boost mode. Setting the VM bit to a '1' does not override the EN0 and EN1 bits stored in the general purpose register. The default setting is '0'. If the LM3553 is in Voltage Mode and an indicator, torch or flash command is issued, the LM3553 will turn on the D1 and D2 current sources and begin regulating the output voltage to a value equal to VFB (350mV or 450mV) + VLED. VM EN1 EN0 Function 0 0 0 Shutdown 0 0 1 Indicator Mode 0 1 0 Torch Mode 0 1 1 Flash Mode 1 0 0 Voltage Mode 1 0 1 Indicator Mode 1 1 0 Torch Mode 1 1 1 Flash Mode Copyright © 2008–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM3553 |
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