參數(shù)資料
型號(hào)： SC621AEVB
廠商： Semtech Corporation
英文描述： Charge Pump, 4 LEDs, 400mA Flash LED, Dual LDOs, and I2C Interface
中文描述： 電荷泵，4個(gè)LED，400mA的閃光LED，雙LDO和I2C接口
文件頁(yè)數(shù)： 18/24頁(yè)
文件大?。?/td> 327K
代理商： SC621AEVB
SC621A
18
Register Map
Address
D7
D6
D5
D4
D3
D2
D1
D0
Reset
Value
Description
0x00
FADE_1
FADE_0
FADE_EN
BL_4
BL_3
BL_2
BL_1
BL_0
0x00
Backlight
Current
Control
0x01
0
(1)
0
(1)
0
(1)
0
(1)
BLEN_4
BLEN_3
BLEN_2
BLEN_1
0x00
Backlight
Enable Control
0x02
0
(1)
0
(1)
0
(1)
FLTO
FL_2
FL_1
FL_0
FL/SPLB
0x10
Flash/Spotlight
Control
0x03
0
(1)
LDO2_2
LDO2_1
LDO2_0
LDO1_3
LDO1_2
LDO1_1
LDO1_0
0x00
LDO Control
Notes:
(1) 0 = always write a 0 to these bits
Register and Bit Definitions
Backlight Current Control Register (0x00)
This register is used to set the currents for the backlight
current sinks, as well as to enable and set the fade step
rate. These current sinks need to be enabled in the
Backlight Enable Control register to be active.
FADE[1:0]
These bits are used to set the rise/fall rate between two
backlight currents as follows:
FADE_1
FADE_0
Fade Feature
Rise/Fall Rate
(ms/step)
0
0
32
0
1
24
1
0
16
1
1
8
The number of steps in changing the backlight current will
be equal to the change in binary count of bits BL[4:0].
FADE_EN
This bit is used to enable or disable the fade feature. When
the fade function is enabled and a new backlight current
is set, the backlight current will change from its current
value to a new value set by bits BL[4:0] at a rate of 8ms to
32ms per step. A new backlight level cannot be written
during an ongoing fade operation, but an ongoing fade
operation may be cancelled by resetting the fade bit.
Clearing the fade bit during an ongoing fade operation
changes the backlight current immediately to the value
of BL[4:0]. The number of counts to complete a fade
operation equals the difference between the old and new
backlight values to increment or decrement the BL[4:0]
bits. If the fade bit is cleared, the current level will change
immediately without the fade delay. The rate of fade may
be changed dynamically, even while a fade operation is
active, by writing new values to the FADE_1 and FADE_0
bits. The total fade time is determined by the number of
steps between old and new backlight values, multiplied
by the rate of fade in ms/step. The longest elapsed time
for a full scale fade-out of the backlight is nominally 1.024
seconds when the default interval of 32ms is used.
相關(guān)PDF資料
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