RT6908
Timing Diagram
12V
or VL
V
EN
12V
or VL
V
EN_I2C
300µs
V
1.1V
3.3V
CORE
300µs
V
I/O
VDET
T
CRST
V
RSTB
2
I C Bus
TCON Program
Control Byte
0xFF=0x55
DLY1,DLY2 begins start up
(Internal Register)
VGL
T
DLY1
3ms
Q1 VSG
4V
T
DLY2
(V
- V
GD
)
LXI
T
CGD
AVDD
T
SS
T
DLY3
VGH
4ms
Figure 1. I2C Mode Power Sequence (VEN_I2C = 1)
12V
or VL
V
EN
0V
V
EN_I2C
300µs
V
1.1V
3.3V
CORE
300µs
V
I/O
VDET
TCRST
V
RSTB
2
I C Bus
3ms
VGL
T
DLY1
(Default : 200ms)
(Default voltage : -6V)
4V
Q1 VSG
T
DLY2
(Default : 400ms)
(V - V
LXI
)
GD
(Default voltage : 15.6V)
T
CGD
T
SS
(Default : 2ms)
(Default voltage : 35.5V)
AVDD
VGH
T
DLY3
(Default : 10ms)
4ms
Figure 2. Default Mode Power Sequence (VEN_I2C = 0)
Copyright 2013 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS6908-01 March 2013
www.richtek.com
3
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