LP8860-Q1_17 Datasheet, PDF (83/110 Pages) Texas Instruments – Low-EMI Automotive LED Driver With Four 150-mA Channels

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8.6.2.22 EEPROM Register 21
Address 0x75
EEPROM Register 21
7
6
BOOST_OFFTIME_SEL[1:0]
5
4
BOOST_BLANKTIME_SEL[1:0]
3
RESERVED
LP8860-Q1
SNVSA21F – MAY 2014 – REVISED JULY 2017
2
1
0
BOOST_VO_SLOPE_CTRL[2:0]
Name
Bit
BOOST_OFFTIME_SEL[1:0]
7:6
BOOST_BLANKTIME_SEL[1:0]
5:4
BOOST_VO_SLOPE_CTRL[2:0]
2:0
Access
R/W
R/W
R/W
Description
Boost time off selection
00 = 131 ns
01 = 68 ns
10 = 38 ns
11 = 24 ns
Boost blank time selection
00 = 162 ns
01 = 88 ns
10 = 63 ns
11 = 40 ns
Sets the speed for boost output voltage scaling up or down
000 = 1 (every PWM cycle)
001 = 2 (every other PWM cycle)
010 = 3 (every third PWM cycle)
011 = 4 (every 4th PWM cycle)
100 = 5 (every 5th PWM cycle)
101 = 6 (every 6th PWM cycle)
110 = 8 (every 8th PWM cycle)
111 = 16 (every 16th PWM cycle)
8.6.2.23 EEPROM Register 22
Address 0x76
EEPROM Register 20
7
6
5
4
VDD_UVLO_
LEVEL
RESERVED
3
2
CP_2X_CLK[1:0]
1
CP_2X_EN
0
SQW_PULSE_
GEN_EN
Name
Bit
Access
Description
VDD_UVLO_LEVEL
7
R/W
VDD UVLO protection level
0 = 2.5 V
1 = 3.0 V
Voltage hysteresis typically 50 mV.
2.5V level can be used if PLL frequency up to 20 MHz. With higher
PLL frequency logic is not specified to work down to 2.5 V VDD
CP_2X_CLK[1:0]
3:2
R/W
Charge pump clock frequency
00 = 104 kHz
01 = 208 kHz
10 = 417 kHz
11 = 833 kHz
CP_2X_EN
1
R/W
Charge pump enable. CP is enabled at soft start if CP_2X_EN
EEPROM bit asserted.
0 = disabled
1 = enabled
SQW_PULSE_GEN_EN
0
R/W
External charge pump clock enable (50% duty cycle 100 kHz).
Clock connected to SQW pin. SQW clock enabled at soft start.
0 = disabled
1 = enabled
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