ds3881et-r-c Maxim Integrated Products, Inc., ds3881et-r-c Datasheet - Page 19

• Manufacturer Part Number: ds3881et-r-c
• Description: Ds3881 Single-channel, Automotive Ccfl Controller
• Manufacturer: Maxim Integrated Products, Inc.

Table 4a. Soft-Start Protocol Registers (SSPx) [Shadowed-EEPROM, F0h, F1h, F2h, F3h]
Table 4b. MOSFET Duty Cycle (MDC)⎯Codes for Soft-Start Settings
BIT
SSP#
SSP1
SSP2
SSP3
SSP4
0
1
2
3
4
5
6
7
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Single-Channel Automotive CCFL Controller
ADDR
F0h
F1h
F2h
F3h
LST0 / RSVD
LST1 / RSVD
NAME
MDC0
MDC1
MDC2
MDC0
MDC1
MDC2
FACTORY
DEFAULT
21h
43h
65h
77h
LST1
MDC CODE
0
0
1
1
RSVD
RSVD
RSVD
LST1
MSB
0h
1h
2h
3h
7
MDC0/1/2/3: These bits determine a MOSFET duty cycle that repeats twice in the
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LST0
0
1
0
1
LST0/1: These bits select strike and lamp out timeout. LST0 and LST1
Lamp Cycles 11 and 12
Lamp Cycles 15 and 16
6
Lamp Cycles 3 and 4
Lamp Cycles 7 and 8
MOSFET DUTY CYCLE
STRIKE AND LAMP OUT TIMEOUT
(LAMP FREQUENCY CYCLES)
Fixed at 0%
Fixed at 3%
Fixed at 6%
Fixed at 9%
5
control fault behavior for all lamps.
16 lamp cycle soft-start.
Reserved
32,768
65,536
98,304
4
FUNCTION
MDC CODE
RSVD
RSVD
RSVD
LST0
3
4h
5h
6h
7h
2
LAMP FREQUENCY IS 50kHz
Lamp Cycles 13 and 14
Lamp Cycles 9 and 10
Lamp Cycles 1 and 2
Lamp Cycles 5 and 6
MOSFET DUTY CYCLE
EXAMPLE TIMEOUT IF
Most Recent Value
0.66 seconds
1.31 seconds
1.97 seconds
Fixed at 13%
Fixed at 16%
Fixed at 19%
1
—
LSB
0
19