LM3560 Datasheet, PDF (31/42 Pages) Texas Instruments – LM3560 Synchronous Boost Flash Driver w/ Dual 1A High-Side Current Sources (2A Total Flash Current)

LAST FLASH REGISTER (Address 0x81)
The Last Flash Register is a read-only register which is loaded
with the flash code corresponding to the flash level that the
LM3560 was at if any of the following events happen:
1. Voltage at LEDI/NTC falling below V_TRIP 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); or
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 Register. This
results in a delay of 250 µs from when V_LEDI/NTC (NTC mode)
crosses V_TRIP, or V_IN (VIN Monitor enabled) crosses the
V_{IN_TH}. During VIN Flash Monitor there is a 8us deglitch time
so the VIN Flash Monitor Flag is written (and the Last Flash
Register is updated) 8 µs after V_IN falls below V_{IN_FLASH}.
TABLE 12. Last Flash Register Descriptions
Bit 7
(LF2A)
Bit 6
(LF2B)
Bit 5
(LF2C)
Bit 4
(LF2D)
These bits are read only and represent the Flash Current
Code for LED2 that the LM3560 was at during the interrupt.
0000 = 62.5 mA
0001 = 125 mA
0010 = 187.5 mA
0011 = 250 mA
0100 = 312.5 mA
0101 = 375 mA
0110 = 437.5 mA
0111 = 500 mA
1000 = 562.5 mA
1001 = 625 mA
1010 = 687.5 mA
1011 = 750 mA
1100 = 812.5 mA
1101 = 875 mA
1110 = 937.5 mA
1111 = 1000 mA
Bit 3
(LF1A)
Bit 2
(LF1B)
Bit 1
(LF1C)
Bit 0
(LF1D)
These bits are read only and represent the Flash Current Code for
LED1 that the LM3560 was at during the interrupt.
0000 = 62.5 mA
0001 = 125 mA
0010 = 187.5 mA
0011 = 250 mA
0100 = 312.5 mA
0101 = 375 mA
0110 = 437.5 mA
0111 = 500 mA
1000 = 562.5 mA
1001 = 625 mA
1010 = 687.5 mA
1011 = 750 mA
1100 = 812.5 mA
1101 = 875 mA
1110 = 937.5 mA
1111 = 1000 mA
TORCH BRIGHTNESS REGISTER DESCRIPTIONS (Address 0xA0)
Bits [2:0] of the Torch Brightness Register set the Torch cur-
rent for LED1. Bits [5:3] set the Torch current for LED2 (see
Table 13).
TABLE 13. Torch Brightness Register Descriptions
Bit 7
(N/A)
(Not Used)
Bit 6
(N/A)
Bit 5
(TC2A)
Bit 4
(TC2B)
Bit 3
(TC2C)
LED2 Torch Current Select Bits
000 = 31.25 mA (62.5 mA total)
001 = 62.5 mA (125 mA total)
010 =93.75 mA (187.5 mA total) default
011 = 125 mA (250 mA total)
100 = 156.25 mA (312.5 mA total)
101 = 187.5 mA (375 mA total)
110 = 218.75 mA (437.5 mA total)
111 = 250 mA (500 mA total)
Bit 2
(TC1A)
Bit 1
(TC1B)
Bit 0
(TC1C)
LED1 Torch Current Select Bits
000 = 31.25 mA (62.5 mA total)
001 = 62.5 mA (125 mA total)
010 =93.75 mA (187.5 mA total) default
011 = 125 mA (250 mA total)
100 = 156.25 mA (312.5 mA total)
101 = 187.5 mA (375 mA total)
110 = 218.75 mA (437.5 mA total)
111 = 250 mA (500 mA total)
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