LM3559TLX/NOPB National Semiconductor, LM3559TLX/NOPB Datasheet - Page 23

• Manufacturer Part Number: LM3559TLX/NOPB
• Description: LM3559
• Manufacturer: National Semiconductor
• Series: -r

Specifications of LM3559TLX/NOPB

• Constant Current: Yes
• Constant Voltage: -
• Topology: High Side, PWM, Step-Up (Boost)
• Number Of Outputs: 2
• Internal Driver: Yes
• Type - Primary: Flash/Torch
• Type - Secondary: White LED
• Frequency: 1.8MHz ~ 2.2MHz
• Voltage - Supply: 2.5 V ~ 5.5 V
• Voltage - Output: -
• Mounting Type: Surface Mount
• Package / Case: 16-UFBGA
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

LED Fault Flag is triggered. In an LED short condition there
is a 250 µs deglitch time before the LED Fault Flag is set. The
LED Fault Flag can only be reset to (0) by pulling HWEN low,
doing a power on reset of the LM3559, or by removing the
fault condition and reading back the Flags Register.
TX1 AND TX2 INTERRUPT FLAGS
The TX1 and TX2 interrupt flags (bits [3] and [4]) indicate an
interrupt event has occurred on the respective TX inputs. Bit
3 will read back a (1) if TX1 is in TX mode and there has been
a TX1 event since the last read of the Flags Register. Bit 4
will read back a (1) if TX2 is in TX mode and there has been
a TX2 event since the last read of the Flags Register. A read
of the Flags Register automatically resets these bits. A TX
event on TX1 or TX2, can be a high-to-low transition or a low-
to-high transition depending on the setting of the TX1 and TX2
polarity bits (see Configuration Register 1 Bits [6:5]).
LED THERMAL FAULT (NTC Flag)
The NTC flag (bit [5] of the Flags Register) reads back a '1' if
the LM3559 is active in Flash or Torch mode, the device is in
NTC mode, and the voltage at LEDI/NTC has fallen below
I
START AND STOP CONDITIONS
The LM3559 is controlled via an I
START and STOP conditions classify the beginning and end
of the I
transitioning from HIGH to LOW while SCL is HIGH. A STOP
The I
free after a STOP condition. During data transmission the
I
START and a repeated START condition are equivalent func-
tion-wise. The data on SDA must be stable during the HIGH
2
2
C master can generate repeated START conditions. A
C-Compatible Interface
2
C bus is considered busy after a START condition and
2
C session. A START condition is defined as SDA
2
C-compatible interface.
FIGURE 15. Start and Stop Sequences
23
V
has been forced into Torch mode or LED shutdown (depend-
ing on the state of Configuration Register 2 bit [1), the Flags
Register must be read, and the voltage at NTC must go above
1V in order to place the device back in normal operation. (See
NTC MODE
INPUT VOLTAGE FLASH MONITOR FAULT
The V
back a '1' when the Input Voltage Flash Monitor is enabled
and V
threshold. This flag must be read back in order to resume
normal operation after the LED current has been forced to the
lower flash current setting.
INPUT VOLTAGE MONITOR FAULT
The V
a '1' when the Input Voltage Monitor is enabled and V
below the programmed VIN Monitor threshold. This flag must
be read back and V
old in order to resume normal operation.
condition is defined as SDA transitioning from LOW to HIGH
while SCL is HIGH. The I
START and STOP conditions.
period of the clock signal (SCL). In other words, the state of
SDA can only be changed when SCL is LOW.
shows the SDA and SCL signal timing for the I
Bus. See the Electrical Characteristics Tables for timing
values.
TRIP
(1V typical). When this has happened and the LM3559
IN
IN
IN
Flash Monitor Flag (bit [6] of the Flags Register) reads
Monitor Flag (bit [7] of the Flags Register) reads back
falls below the programmed VIN Flash Monitor
section for more details).
IN
must go above the VIN Monitor thresh-
2
C master always generates the
30102818
2
C-Compatible
www.national.com
Figure 16
IN
falls