LM3559 datasheet(32/50 Pages) TI1

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LM3559

SNVS624B – JUNE 2011 – REVISED JUNE 2016

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8.6.9 Last Flash Register

The Last Flash Register is a read-only register loaded with the flash code corresponding to the flash level that

the device was at if any of the following events happens:

1. Voltage at LEDI/NTC falling below VTRIP with the device in NTC mode (Configuration Register 1 bit [4] = 1)

2. Input voltage falling below the programmed VIN monitor threshold with device in VIN monitor mode (VIN

Monitor Register bit [0] = 1)

3. Input voltage falling below the programmed VIN flash monitor threshold with the device in VIN flash monitor

mode (VIN Monitor Register bit [3] = 1).

The Last Flash Register is updated at the same time that the corresponding flag bit is written to the Flags

enabled) crosses the VIN_TH. During VIN flash monitor there is a 8-µs deglitch time so the VIN flash monitor flag is

written (and the Last Flash Register is updated) 8 µs after VIN falls below VIN_FLASH.

Table 10. Last Flash Register Descriptions

Bit 7

(LF2A)

Bit 6

(LF2B)

Bit 5

(LF2C)

Bit 4

(LF2D)

Bit 3

(LF1A)

Bit 2

(LF1B)

Bit 1

(LF1C)

Bit 0

(LF1D)

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)

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. 5 mA (1575 mA total)

1110 = 843.75 mA (1687.5 mA total)

1111 = 900 mA (1800 mA total)

8.6.10 VLED Monitor Register

The VLED Monitor Register controls the internal 4-bit analog to digital converter. Bits [3:0] of this register contain

the 4-bit data of the LED voltage. This data is the digitized voltage of the highest of either VLED1 to GND or

VLED2 to GND. Bit [4] is the manual mode enable which provides for a manual conversion of the ADC. In

manual mode the automatic conversion is still performed. In automatic conversion mode a conversion is

performed each time a flash pulse is initiated. Bit [5] is the ADC shutdown bit. Bit [6] signals the end of

conversion. This is a read-only bit that goes high when a conversion is complete and data is ready. A read of the

VLED Monitor Register clears the EOC bit (see Table 11).

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