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參數(shù)資料
| 型號(hào)： | DS3994 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 4-Channel Cold-Cathode Fluorescent Lamp Controller |
| 中文描述： | 4通道冷陰極熒光燈控制器 |
| 文件頁數(shù)： | 21/28頁 |
| 文件大小： | 557K |
| 代理商： | DS3994 |
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D
4-Channel Cold-Cathode
Fluorescent Lamp Controller
____________________________________________________________________
21
F5h: Control Register 2 (CR2)
BIT
NAME
FUNCTION
0
UMWP
User Memory Write Protect
0 = User Memory Write Access Blocked
1 = User Memory Write Access Permitted
1
POSCR0
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.
POSCR1
POSCR0
DIMMING CLOCK (DPWM)
FREQUENCY RANGE (Hz)
K
(k
-kHz)
1
2
4
8
0
0
1
1
0
1
0
1
22.5 to 55.0
45 to 110
90 to 220
180 to 440
2
POSCR1
3
4
Reserved
Reserved
Reserved. Should be set to one.
Reserved. Should be set to zero.
Lamp Disable. Used to disable channels if all 4 are not required for an application.
LD1
LD0
CHANNELS DISABLED
NUMBER OF ACTIVE
LAMP CHANNELS
0
0
1
1
0
1
0
1
All Channels Enabled
4
2/4
1/2/4
4
3
2
1
5
LD0
6
LD1
7
BVRS
Bright Voltage Range Select.
0 = 0.5V to 2.0V
1 = 0.0V to 3.3V
F8
–
FBh: Burst Dimming Stagger (BDS1/2/3/4)
BIT
0
1
2
3
4
5
6
7
NAME
BDSC0
BDSC1
BDSC2
BDSC3
BDSC4
BDSC5
BDSC6
BDSC7
FUNCTION
8-Bit Programmable Counter That Staggers the Start of Burst Dimming. 00h = 0ms stagger. Setting
the stagger longer than the burst dimming cycle results in the channel never turning on. See Table 2.
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