SN32F760 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 188
Version 2.0
16.6 R-TYPE LCD APPLICATION CIRCUIT
When R-type LCD is enabled (LCDENB=1, LCDTYPE[1:0]=00b in
register), LCD power source (VLCD) is
from external power via VLCD1 pad, and shall be connected to VDD with PCB layout, not internal short to VDD. HW
will assign COM0~3 (refer to DUTY[1:0]), SEG0~11, V3, V2 pin as LCD pins instead of GPIO automatically.
V3 and V2 bias voltage is sourced by internal resistor voltage division, and the internal selective 35k, 100k, 200k, 400k
resistor are selected by REF[1:0] bits in
register. User can connect additional external resistance between
VLCD1/V3/V2 for more driving current.
1/3 Bias (V3= 2/3*VLCD, V2 = 1/3*VLCD)
1/2 Bias (V3 = V2 = 1/2*VLCD)
Note: The 0.1uF capacitors of VLCD1/V3/V2 pins are necessary for power stable, and p
lease put close
to
VLCD1/V3/V2 pins.
Segment 12~Segment 23 pins are shared with P0.10~P0.15 and P1.0~P1.5. When these pins are used as LCD pins,
the SEG1SEL bit shall be set as “1”, and VLCD2 shall also be connected to VDD with PCB layout.
Segment 24~Segment 31 pins are shared with P0.0~P0.7. When these pins are used as LCD pins, the SEG2SEL bit
shall be set as “1”, and VLCD3 shall also be connected to VDD with PCB layout.
0.1uF
V3
V
2
VLCD1
VLCD
R
R
R
R
=
35
k
/
100
k
/
200
k
/
400
k
VDD
0.1uF
R
’
R
’
0.1uF
V3
V
2
VLCD1
VLCD
R
R
R
R
=
35
k
/
100
k
/
200
k
/
400
k
VDD
R
’
R
’
0.1uF
R
’
0.1uF
Содержание SN32F755
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