LM3554TME/NOPB National Semiconductor, LM3554TME/NOPB Datasheet - Page 34

• 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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V
The V
Monitor comparator as well as selects the 4 programmable
Reads Back '1'
Reads Back '1' Reads Back '1' Reads Back '1' Reads Back '1' Reads Back '0'
IN
Bit 7 (Not
Bit 7 (Not
MONITOR REGISTER
Used)
used)
IN
Monitor Register controls the on/off state of the V
External Flag)
pin will pull low
a GPIO output
when the LED
Thermal Fault
External Flag
configured as
ENVM/TX2/
TX2/GPIO2
Bit 6 (NTC
the ENVM/
Flag is set
Bit 6 (Not
1 = When
(default)
GPIO2 is
0 = NTC
disabled
mode is
used)
Bit 5 (ENVM/
This bit is the
(default is 0)
GPIO2 pin in
read or write
TX2/GPIO2
ENVM/TX2/
GPIO mode
data for the
Bit 5 (Not
used)
data)
FIGURE 23. V
TABLE 9. V
TABLE 8. GPIO Register Bit Settings
a GPIO Output
TX2/GPIO2 is
TX2/GPIO2 is
Bit 4 (ENVM/
a GPIO Input
TX2/GPIO2
0 = ENVM/
1 = ENVM/
Bit 4 (Not
direction)
(default)
used)
IN
data
IN
Monitor Register Bit Settings
Monitor Register Description
IN
34
TX2/GPIO2 is
TX2/GPIO2 is
Bit 3 (ENVM/
Configuration
configured as
Register bit 5
according to
TX2/GPIO2
0 = ENVM/
1 = ENVM/
configured
Bit 3 (Not
Control)
(default)
thresholds.
the V
a GPIO
used)
the
IN
Monitor feature.
Figure 23
01=3.2V threshold (V
This bit is the
TX1/TORCH/
(default is 0)
GPIO1 data)
GPIO1 pin in
read or write
GPIO mode
data for the
Threshold)
Bit 2 (TX1/
Bit 2 (VIN
TORCH/
00 = 3.1V threshold (V
10 = 3.3V threshold (V
11 = 3.4V threshold (V
falling) Default
and
falling)
falling)
Table 9
GPIO1 is an
GPIO1 data
Threshold)
Bit 1 (TX1/
GPIO1 is a
GPIO input
direction)
Bit 1 (VIN
(default)
TORCH/
0 = TX1/
TORCH/
TORCH/
1 = TX!/
output
describe the bit settings of
IN
falling)
IN
IN
IN
30042047
Comparator is
Comparator is
configured as
configured as
an active low
GPIO1 pin is
GPIO1 pin is
Bit 0 (TX1/
Monitoring
Monitoring
reset input
Bit 0 (VIN
Control)
(default)
(default)
enabled.
TORCH/
0 = TX1/
TORCH/
1 = TX1/
TORCH/
disabled
Monitor
Enable)
a GPIO
0 = V
1 = V
GPIO1
IN
IN