LM3554TME/NOPB National Semiconductor, LM3554TME/NOPB Datasheet - Page 29

• 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

FLASH 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. Writing to the Flash Brightness
STROBE Edge or Level
Select
0 = (Level Sensitive) When
STROBE goes high, Flash
current will turn on and
remain on for the duration
the STROBE pin is held
high
Timeout occurs, whichever
comes first.(default)
1 = (Edge Triggered) When
STROBE goes high , Flash
current will turn on and
remain on for the duration
of the Flash Timeout.
or
Bit 7 (STR)
when
Flash
Flash Current Select Bits
0000 = 35.5mA (71mA total)
0001 = 73mA (146mA total)
0010 = 109mA (218mA total)
0011 = 147.5mA (295mA total)
0100 = 182.5mA (365mA total)
0101 = 220.5mA (441mA total)
0110 = 259mA (518mA total)
111 = 298mA (596mA total)
1000 =326mA (652mA total)
1001 = 364.5mA (729mA total)
1010 = 402.5mA (805mA total)
1011 = 440.5mA (881mA total)
1100 = 480mA (960mA total)
1101 = 518.5mA (1037mA total) Default
1110 = 556.5mA (1113mA total)
1111 = 595.5mA (1191mA total)
Bit 6 (FC3)
FIGURE 17. Flash Brightness Register Description
TABLE 3. Flash Brightness Register Bit Settings
Bit 5 (FC2)
Bit 4 (FC1) Bit 3 (FC0)
29
Register bits [2:0] automatically updates the Torch Brightness
Register bits [2:0]. Bits [6:3] set the current level in Flash
mode (see
select bit (STR) (see
Table
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)
3). Bit [7] sets the STROBE Termination
Table
3).
Bit 1 (EN1)
30042022
Bit 0 (EN0)
www.national.com