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RT4832AWSC Fiches technique(PDF) 18 Page - Richtek Technology Corporation

No de pièce RT4832AWSC
Description  Sub PMIC with Dual-Output Boost Converter
PDF  26 Pages
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Fabricant  RICHTEK [Richtek Technology Corporation]
Site Internet  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT4832AWSC Fiches technique(HTML) 18 Page - Richtek Technology Corporation

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RT4832A
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
DS4832A-00
January
2017
18
0
0
0
0
0
0
ENP
VPOS
VCPOUT
VBST
ENM
Periodic
mode
0
VIN
ton
...
...
tperiod
ton
ton
tperiod
Figure 3. Periodic Mode Control
Backlight LED
The
RT4832A
provides
brightness
controllable
backlight LED for maximum 2P10S application. The
LED current be set via register and external PWM pin.
Each channel can be control by enable bits (LED1 in
register 0x0A [4] and LED2 in register 0x0A [3]). The
ramp time from one brightness current to another
current can be adjusted from 0ms to 8000ms in the
register 0x03[6:3]. There are two different ways to map
the brightness code (or PWM duty cycle) to the LED
current: linear and exponential mapping.
The RT4832A LED serial number depends on the
minimum voltage of the battery and the forward
voltage(VF) of the LED. If the minimum voltage is 2.7V
and the VF of the backlight LED is 3.2V, the maximum
number of each string is 8.
Table 5. BLED Operation Control Table
Back Light
Enable
0x0A[0]
BLED1 En
0x0A[4]
BLED2 En
0x0A[3]
PWM
Enable
0x09[6]
PWM pin
Status
0
X
X
X
X
Standby
1
0
0
X
X
LED Bias enable
1
1
0
0
X
ILED1 = BLED Brightness
1
0
1
0
X
ILED2 = BLED Brightness
1
1
1
0
X
ILED1 & ILED2 = BLED Brightness
1
1
0
1
Duty
ILED1 =(BLED Brightness*PWM Duty)
1
0
1
1
Duty
ILED1 =(BLED Brightness*PWM Duty)
1
1
1
1
Duty
ILED1 = ILD2 = (BLED Brightness*PWM
Duty)



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