參數(shù)資料
型號: PCF8535U
廠商: NXP SEMICONDUCTORS
元件分類: 顯示驅(qū)動器
英文描述: 65 x 133 pixel matrix driver
中文描述: LIQUID CRYSTAL DISPLAY DRIVER, UUC
封裝: DIE
文件頁數(shù): 14/52頁
文件大小: 1765K
代理商: PCF8535U
1999 Aug 24
14
Philips Semiconductors
Objective specification
65
×
133 pixel matrix driver
PCF8535
handbook, full pagewidth
MGS472
00
01
02
a
VLCD
03
04
05
06
. . .
5F
6F
7F
00
01
02
03
04
05
06
. . .
5F
6F
7F
b
LOW
HIGH
Fig.5 V
OP
programming of PCF8535.
V
OP
[6:0] programming (00H to 7FH, programming range LOW and HIGH).
7.14
Voltage multiplier control
7.14.1
S[1:0]
The PCF8535 incorporates a software configurable
voltage multiplier. After reset (RES) the voltage multiplier
is set to 2
×
V
DD2
. Other voltage multiplier factors are set
via the HV-gen command page. Before switching on the
charge pump, the charge pump has to be pre-charged
using the following sequence.
A starting state of HVE = 0, DOF = 0, PD = 1 and DM = 0
is assumed. A small delay between steps is indicated.
The recommended wait period is 20
μ
s per 100 nF of
capacitance on V
LCD1
.
1.
Set DM = 1 and PD = 0
2.
Delay
3.
Set the multiplication factor to 2 by setting S[1:0] = 00
4.
Set the required V
OP
and PRS.
5.
Set HVE = 1 to switch-on the charge pump with a
multiplication factor of 2
6.
Delay
7.
Increase the number of stages, one at a time, with a
delay between each until the required level is
achieved.
Table 7
HV generator multiplication factor
S[1]
S[0]
MULTIPLICATION FACTOR
2
×
V
DD2
3
×
V
DD2
4
×
V
DD2
5
×
V
DD2
0
0
1
1
0
1
0
1
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