LP3958 Datasheet, PDF (27/28 Pages) National Semiconductor (TI) – Lighting Management Unit with High Voltage Boost Converter

LP3958 Register Bit Explanations (Continued)
ENABLES (0BH) – ENABLES REGISTER
D7
R-0
D6
NSTBY
RW - 0
D5
EN_BOOST
RW - 0
D4
R-0
D3
R-0
D2
EN_AUTOLOAD
RW - 1
D1
R-0
D0
R-0
NSTBY
EN_BOOST
EN_AUTOLOAD
Bit 6
Bit 5
Bit 2
0 – LP3958 standby mode
1 – LP3958 active mode
0 – Boost converter disabled
1 – Boost converter enabled
0 – Boost active load disabled
1 – Boost active load enabled
BOOST OUTPUT (0DH) – BOOST OUTPUT VOLTAGE CONTROL REGISTER
D7
RW - 0
D6
RW - 0
D5
RW - 0
D4
D3
BOOST[7:0]
RW - 0
RW - 1
D2
RW - 0
D1
RW - 0
D0
RW - 0
BOOST output voltage adjustment
BOOST[7:0]
Typical boost output voltage (V)
0000 1000
8.00
0000 1001
9.00
0000 1010
10.00
0000 1011
11.00
0000 1100
12.00
0000 1101
13.00
0000 1110
14.00
0000 1111
15.00
0001 0000
16.00
0001 0001
17.00
0001 0010
18.00
PWM ENABLE (2BH) – EXTERNAL PWM CONTROL REGISTER
D7
R-0
D6
R-0
D5
R-0
D4
EN_EXT_K1_PWM
RW - 0
D3
EN_EXT_K2_PWM
RW - 0
D2
EN_EXT_K3_PWM
RW - 0
D1
EN_MAIN_PWM
RW - 0
D0
EN_SUB_PWM
RW - 0
EN_EXT_K1_PWM
EN_EXT_K2_PWM
EN_EXT_K3_PWM
EN_EXT_MAIN_PWM
EN_EXT_SUB_PWM
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0 – External PWM control for KEY1 disabled
1 – External PWM control for KEY1 enabled
0 – External PWM control for KEY2 disabled
1 – External PWM control for KEY2 enabled
0 – External PWM control for KEY3 disabled
1 – External PWM control for KEY3 enabled
0 – External PWM control for MAIN disabled
1 – External PWM control for MAIN enabled
0 – External PWM control for SUB disabled
1 – External PWM control for SUB enabled
27
www.national.com