Rainbow-electronics MAX8759 User Manual Page 24
- Page / 31
- Table of contents
- BOOKMARKS
Rated. / 5. Based on customer reviews
MAX8759
The relationships among these 3 control bits can be
thought of as specifying an operating mode for the invert-
er. The defined modes are shown in Table 4. Note that
depending on the settings of some bits, other bits have
no effect and are don’t-care bits—they are shown with a
value of X in Table 4. For example, when the ALS_CTL bit
is 1, the value of PWM_SEL has no effect on the operation
of the inverter, so its value is shown as X.
ALSDEL0 and ALSDEL1 set the delay time required
to change the brightness in ALS mode. This delay time is
necessary for smooth transitions during brightness
change. Table 5 shows the available delays.
Note that the behavior of register 0x00 (brightness con-
trol register) is affected by certain combinations of the
control bits as shown in Table 4.
When SMBus mode is selected, register 0x00 reflects the
last value written to it. However, when any non-SMBus
mode is selected, register 0x00 reflects the current bright-
ness value based on the current mode of operation.
Fault/Status Register [0x02] (POR = 0x00)
This register has 3 status bits that allow monitoring the
inverter’s operating state. Bit 0 is a logical OR of open-
lamp fault and overcurrent fault. Bit 2 indicates sec-
ondary/UL overcurrent fault. Bit 3 always indicates the
current lamp on/off status. The value of this bit is one
whenever both lamp 1 and lamp 2 are on. The value of
this bit is zero whenever lamp 1 or lamp 2 is off. The
remaining bits are reserved for future use. All reserved
bits return a zero when read. All the bits in this register
are read only. A write-byte cycle to register 0x02 has
no effect. Write zero to bit 0 of register 0x01 to clear the
fault bit.
Low-Cost, SMBus, CCFL Backlight Controller
24 ______________________________________________________________________________________
ALS_CTL
PWM_MD
PWM_SEL
MODE
11XALS mode
10X
ALS mode with DPST
0X1PWM mode
010SMBus mode
000
SMBus mode with
DPST
ALSDEL1 ALSDEL0
DELAY TIME
(ms)
N
PERIODS
11 25 5
10 15 3
01 10 2
0020 (default) 4
BIT 7 (R) BIT 6 (R) BIT 5 (R) BIT 4 (R) BIT 3 (R) BIT 2 (R) BIT 1 (R) BIT 0 (R)
Reserved Reserved Reserved Reserved LAMP_STAT OV_CURR Reserved FAULT
LAMP_STAT: Lamp status bit (1 = lamp 1 and lamp 2 are on, 0 = lamp 1 or lamp 2 is off).
OV_CURR: Secondary/UL overcurrent fault (1 = secondary/UL overcurrent fault, 0 = no secondary/UL overcurrent).
FAULT: Fault bit (1 = open-lamp or primary overcurrent fault, 0 = no fault).
Table 4. Operating Modes Selected by
Device Control Register Bits 3, 2, and 1
Table 5. Delay Time Selected by Device
Control Register Bits 5, 4
- General Description 1
- Applications 1
- Features 1
- Ordering Information 1
- Minimal Operating Circuit 1
- ABSOLUTE MAXIMUM RATINGS 2
- ELECTRICAL CHARACTERISTICS 2
- Pin Description 10
- Pin Description (continued) 11
- Typical Operating Circuit 13
- Detailed Description 13
- Lamp-Current Regulation 16
- Feed-Forward Control 17
- Lamp Startup 17
- Dimming Control 18
- SMBus with DPST Mode 18
- Fault Protections 19
- Linear Regulator Output (V 19
- POR and UVLO 19
- Low-Power Shutdown 20
- SMBus Interface (SDA, SCL) 20
- SMBus Register Definitions 21
- Table 3. Commands Description 22
- Control Register Bits 5, 4 24
- Applications Information 26
- Component Selection 27
- COMP Capacitor Selection 28
- Setting the Fault-Delay Time 28
- Bootstrap Capacitors 28
- Dual-Lamp Operating Circuit 28
- Layout Guidelines 28
- Chip Information 30
- Pin Configuration 30
- Package Information 31
Related products and manuals for Control panel Rainbow-electronics MAX8759
(13 pages)Acer Aspire E5-473 Handbücher
Bedienungsanleitungen und Benutzerhandbücher für Notebooks Acer Aspire E5-473.
Wir stellen 1 PDF-Handbücher Acer Aspire E5-473 zum kostenlosen herunterladen nach Dokumenttypen zur Verfügung Bedienungsanleitung
Comments to this Manuals