ds3881et-r-c Maxim Integrated Products, Inc., ds3881et-r-c Datasheet - Page 21

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

Table 6. Control Register 2 (CR2) [Shadowed-EEPROM, F5h]
BIT
0
1
2
3
4
5
6
7
R/W
R/W
R/W
R/W
R/W
R/W
R/W
—
—
Single-Channel Automotive CCFL Controller
DEFAULT
0
0
0
1
0
0
0
0
POSCR0
POSCR1
UMWP
NAME
RSVD
RSVD
PDNE
LSR0
LSR1
User Memory Write Protect
0 = Write access blocked.
1 = Write access permitted.
Reserved. This bit should be set to zero.
Reserved. This bit should be set to zero.
Power-Down. Logically ORed with the PDN pin. Setting this bit high resets the controller,
clears the fault logic, and places the part in power-down mode. 0 = Normal. All circuitry is
off, except I
____________________________________________________________________
DPWM Oscillator Range Select. When using an external source for the dimming clock,
these bits must be set to match the external oscillator’s frequency. When using a
resistor to set the dimming frequency, these bits plus the external resistor control the
frequency.
Lamp Sample Rate Select. Determines the feedback sample rate of the LCM inputs.
POSCR1
LSR1
0
0
1
1
0
0
1
1
2
C interface.
POSCR0
LSR0
0
1
0
1
0
1
0
1
SELECTED LAMP SAMPLE
DIMMING CLOCK (DPWM)
FREQUENCY RANGE (Hz)
16 Lamp Frequency Cycles
32 Lamp Frequency Cycles
4 Lamp Frequency Cycles
8 Lamp Frequency Cycles
FUNCTION
22.5 to 55.0
180 to 440
45 to 110
90 to 220
RATE
EXAMPLE SAMPLE RATE
IF LAMP FREQUENCY IS
k (kΩ • kHz)
12,500Hz
6250Hz
3125Hz
1563Hz
50kHz
1
2
4
8
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