參數(shù)資料
型號(hào)： PCF8578T
廠商： NXP Semiconductors N.V.
元件分類(lèi)： LCD驅(qū)動(dòng)器
英文描述： LCD row-column driver for dot matrix graphic displays
封裝： PCF8578HT/1<SOT357-1 (TQFP64)|<<http://www.nxp.com/packages/SOT357-1.html<1<Always Pb-free,;PCF8578T/1<SOT190-1 (VSO56)|<<http://www.nxp.com/packages/SOT190-1.html<1&l
文件頁(yè)數(shù)： 8/46頁(yè)
文件大小： 274K
代理商： PCF8578T
PCF8578_6
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 — 5 May 2009
16 of 46
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
8.5 Oscillator
8.5.1 Internal clock
The clock signal for the system may be generated by the internal oscillator and prescaler.
The frequency is determined by the value of the resistor Rext(OSC), see Figure 10. For
normal use a value of 330 k
is recommended. The clock signal, for cascaded
PCF8579s, is output at CLK and has a frequency of 1
6 (multiplex rate 1:8, 1:16 and 1:32)
or 1
8 (multiplex rate 1:24) of the oscillator frequency.
8.5.2 External clock
If an external clock is used, OSC must be connected to VDD and the external clock signal
to CLK. Table 8 summarizes the nominal CLK and SYNC frequencies.
[1]
A clock signal must always be present, otherwise the LCD may be frozen in a DC state.
[2]
Rext(OSC) = 330 k.
8.6 Timing generator
The timing generator of the PCF8578 organizes the internal data ow of the device and
generates the LCD frame synchronization pulse SYNC, whose period is an integer
multiple of the clock period. In cascaded applications, this signal maintains the correct
timing relationship between the PCF8578 and PCF8579s in the system.
To avoid capacitive coupling, which could adversely affect oscillator stability, Rext(OSC) should be
placed as closely as possible to the OSC pin. If this proves to be a problem, a ltering capacitor
may be connected in parallel to Rext(OSC).
Fig 10. Oscillator frequency as a function of external oscillator resistor, Rext(OSC)
10
msa837
1
103
102
103
104
10
fosc
(kHz)
Rext(OSC) (k)
Table 8.
Signal frequencies required for nominal 64 Hz frame frequency[1]
Oscillator frequency,
fosc (Hz)[2]
Frame frequency,
ffr (Hz)
Multiplex rate,
(1:n)
Division ratio Clock frequency,
fclk (Hz)
12288
64
1:8, 1:16, 1:32
6
2048
12288
64
1:24
8
1536
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCF8578T/1 制造商:NXP Semiconductors 功能描述:IC LCD DRIVER ROW/COLUMN 56VSOP 制造商:NXP Semiconductors 功能描述:IC, LCD DRIVER, ROW/COLUMN, 56VSOP
PCF8578T/1,112 功能描述:LCD 驅(qū)動(dòng)器 LCD DRVR DOT MATRIX RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
PCF8578T/1,118 功能描述:LCD 驅(qū)動(dòng)器 DOT MATRIX LCD DRIVER (R/COLM) RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
PCF8578T/1112 制造商:NXP Semiconductors 功能描述:IC LCD DRVR 6V VSOP-56
PCF8578TD 功能描述:LCD 驅(qū)動(dòng)器 LCD DRVR DOT MATRIX RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
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