- -
48
108
XIN
I, OSC
Crystal 24MHz OSC input PAD
109
XOUT
O, OSC
Crystal 24MHz OSC output PAD
110
VDD
P
Digital Core power(1.8V)
111
VSSD
G
Digital Ground
112
VCC
P
I/O POWER(3.3V)
113
RESET
I, Pull up
System reset pin, low enable
114
TEST
I, Pull down
Test mode,
( Internal 100K pull down)
115
P1.0/ NORCSN
I/O Pull up & EN
GPIO, NOR FLASH Chip select
116
D8/P3.0
I/O
Flash/ LCD/ SDRAM data bus bit 8 GPIO
117
D9/P3.1
I/O
Flash/ LCD/ SDRAM data bus bit 9 GPIO
118
D10/P3.2
I/O
Flash/ LCD/ SDRAM data bus bit 10 GPIO
119
D11/P3.3
I/O
Flash/ LCD/ SDRAM data bus bit 11 GPIO
120
D12/P3.4
I/O
Flash/ LCD/ SDRAM data bus bit 12 GPIO
121
D13/P3.5
I/O
Flash/ LCD/ SDRAM data bus bit 13 GPIO
122
D14/P3.6
I/O
Flash/ LCD/ SDRAM data bus bit 14 GPIO
123
D15/P3.7
I/O
Flash/ LCD/ SDRAM data bus bit 15 GPIO
124
LCDRDN
O
LCD Read execution pin
125
LCDWRN
O
LCD Write execution pin
126
LCDCSN
O
LCD driver chip select
127
FCE0
O
Flash chip select 0
128
VDDA
P
Analog 1.8V power output, Connect one external 10uF CAP
3.5.3 Function introduction to RT9284B
1. Description
The RT9284A/B is a compact, high efficient and high integration LED driver. Internal 22V MOSFET
can support 2 to 5 White LEDs for backlighting and camera flashing.
Highly integration and internal compensation network minimizes as 5 external component counts.
Optimized operation frequency can meet the requirement of small LC filters value and low operation
current with high efficiency. Internal soft start function can reduce the inrush current. Tiny package type of
TSOT-23-5 and TSOT-23-6 packages provide the best solution for PCB space saving and total BOM cost.
2. Features
◆
VIN Operating Range : 2.7V to 5.5V
◆
Maximum Output Voltage up to 20V