LM3559TLX National Semiconductor Corporation, LM3559TLX Datasheet - Page 31

• Manufacturer Part Number: LM3559TLX
• Description: Synchronous Boost Flash Driver With Dual 900 Ma High Side Current Sources 1.8a Total Flash Current
• Manufacturer: National Semiconductor Corporation

LAST FLASH REGISTER
The Last Flash Register is a read only register which is loaded
with the flash code corresponding to the flash level that the
LM3559 was at if any of the following events happens:
1.
2.
3.
These bits are read only and represent the Flash Current
Code for LED2 that the LM3559 was at during the interrupt.
0000 = 56.25 mA (112.5 mA total)
0001 = 112.5 mA (225 mA total)
0010 = 168.75 mA (337.5 mA total)
0011 = 225 mA (450 mA total)
0100 = 281.25mA (562.5 mA total)
0101 = 337.5 mA (675 mA total)
0110 = 393.75 mA (787.5 mA total)
0111 = 450 mA (900 mA total)
1000 = 506.25 mA (1012.5 mA total)
1001 = 562.5 mA (1125 mA total)
1010 = 618.75 mA (1237.5 mA total)
1011 = 675 mA (1350 mA total)
1100 = 731.25 mA (1562.5 mA total)
1101 = 787. 5mA (1575 mA total)
1110 = 843.75 mA (1687.5 mA total)
1111 = 900 mA (1800 mA total)
(LF2A)
Voltage at LEDI/NTC falling below V
in NTC mode (Configuration Register 1 bit [4] = 1)
Input voltage falling below the programmed VIN Monitor
Threshold with device in VIN Monitor mode (VIN Monitor
Register bit [0] = 1)
Input voltage falling below the programmed VIN Flash
Monitor Threshold with the device in VIN Flash Monitor
mode (VIN Monitor Register bit [3] = 1).
Bit 7
(LF2B)
Bit 6
(LF2C)
Bit 5
TABLE 10. Last Flash Register Descriptions
TRIP
with the device
(LF2D)
Bit 4
These bits are read only and represent the Flash Current Code for
LED1 that the LM3559 was at during the interrupt.
0000 = 56.25 mA (112.5 mA total)
0001 = 112.5 mA (225 mA total)
0010 = 168.75 mA (337.5 mA total)
0011 = 225 mA (450 mA total)
0100 = 281.25mA (562.5 mA total)
0101 = 337.5 mA (675 mA total)
0110 = 393.75 mA (787.5 mA total)
0111 = 450 mA (900 mA total)
1000 = 506.25 mA (1012.5 mA total)
1001 = 562.5 mA (1125 mA total)
1010 = 618.75 mA (1237.5 mA total)
1011 = 675 mA (1350 mA total)
1100 = 731.25 mA (1562.5 mA total)
1101 = 787. 5mA (1575 mA total)
1110 = 843.75 mA (1687.5 mA total)
1111 = 900 mA (1800 mA total)
31
(LF1A)
The Last Flash Register is updated at the same time that the
corresponding Flag bit is written to the Flags Register. This
results in a delay of 250 µs from when V
crosses V
V
so the VIN Flash Monitor Flag is written (and the Last Flash
Register is updated) 8 µs after V
Bit 3
IN_TH
. During VIN Flash Monitor there is a 8 µs deglitch time
TRIP
, or V
(LF1B)
Bit 2
IN
(VIN Monitor enabled) crosses the
(LF1C)
IN
Bit 1
falls below V
LEDI/NTC
IN_FLASH
(NTC mode)
www.national.com
(LF1D)
Bit 0
.