LM3554TME/NOPB National Semiconductor, LM3554TME/NOPB Datasheet - Page 28

• Manufacturer Part Number: LM3554TME/NOPB
• Description: IC LED DVR PHOTO FLASH 16-USMD
• Manufacturer: National Semiconductor
• Type: Photo Flash LED (I²C Interface)r

Specifications of LM3554TME/NOPB

• Constant Current: Yes
• Topology: High Side, Step-Up (Boost)
• Number Of Outputs: 2
• Internal Driver: Yes
• Type - Primary: Flash/Torch
• Type - Secondary: White LED
• Frequency: 2MHz
• Voltage - Supply: 2.7 V ~ 5.5 V
• Voltage - Output: 5V
• Mounting Type: Surface Mount
• Package / Case: 16-MicroSMD
• Operating Temperature: -30°C ~ 85°C
• Current - Output / Channel: 600mA
• Internal Switch(s): Yes
• Efficiency: 90%
• Led Driver Application: LED Backlighting, Portable Electronics
• No. Of Outputs: 2
• Output Current: 1.2A
• Input Voltage: 2.7V To 5.5V
• Dimming Control Type: I2C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM3554TMETR

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Register Descriptions
TORCH BRIGHTNESS REGISTER
Bits [2:0] of the Torch Brightness Register, or bits [2:0] of the
Flash Brightness Register place the device in shutdown or
control the on/off state of Torch, Flash, the Indicator LED and
the Voltage output mode (see
Brightness Register bits [2:0] automatically updates the Flash
Indicator Current Select Bits
00 = 2.3mA
01 = 4.6mA (default state)
10 = 6.9mA
11 = 8.2mA
Bit 7 (IND1)
Configuration Register 1
Configuration Register 2
VIN Monitor Register
Torch Brightness
Flash Brightness
Register Name
Flash Duration
GPIO Register
Flag Register
Bit 6 (IND0)
Torch Current Select Bits
000 = 17mA (34mA total)
001 = 35.5mA (71mA total)
010 = 54mA (108mA total) default state
011 = 73mA (146mA total)
100 = 90mA (180mA total)
101 = 109mA (218mA total)
110 = 128mA (256mA total)
111 = 147.5mA (295mA total)
Bit 5 (TC2)
Table
FIGURE 16. Torch Brightness Register Description
TABLE 2. Torch Brightness Register Bit Settings
2). Writing to Torch
TABLE 1. LM3554 Internal Registers
Bit 4 (TC1)
Internal Hex Address
0xA0
0xB0
0xC0
0xD0
0xE0
0xF0
0x20
0x80
28
Bit 3 (TC0)
Brightness Register bits [2:0]; writing to bits [2:0] of the Flash
Brightness Register automatically updates bits [2:0] of the
Torch Brightness Register. Bits [5:3] set the current level in
Torch mode (see
current level (see
Enable Bits
000 = Shutdown (default)
001 = Indicator Mode
010 = Torch Mode
011 = Flash Mode (bits reset at timeout)
100 = Voltage Output Mode
101 = Voltage Output + Indicator Mode
110 = Voltage Output + Torch Mode
111 = Voltage Output + Flash Mode (bits [1:0] are
reset at end of timeout)
Bit 2 (VM)
Table
Table
2).
2). Bits [7:6] set the LED Indicator
Power On or Reset Value
Bit 1 (EN1)
0x50
0x68
0x4F
0x40
0x42
0xF0
0x80
0xF0
30042021
Bit 0 (EN0)