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參數(shù)資料
| 型號(hào)： | PCF85162T/1 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | LIQUID CRYSTAL DISPLAY DRIVER, PDSO48 |
| 封裝： | 6.10 MM, PLASTIC, MO-153, SOT362-1, TSSOP-48 |
| 文件頁數(shù)： | 10/43頁 |
| 文件大小： | 321K |
| 代理商： | PCF85162T/1 |
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PCF85162_2
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 7 May 2010
18 of 43
NXP Semiconductors
PCF85162
Universal LCD driver for low multiplex rates
Once the display RAM of the first PCF85162 has been written, the second PCF85162 is
selected by sending the device-select command again. This time however the command
matches the second device's hardware subaddress. Next the load-data-pointer command
is sent to select the preferred display RAM address of the second PCF85162.
This last step is very important because during writing data to the first PCF85162, the data
pointer of the second PCF85162 is incremented. In addition, the hardware subaddress
should not be changed whilst the device is being accessed on the I2C-bus interface.
7.13 Output bank selector
The output bank selector (see Table 13) selects one of the four rows per display RAM
address for transfer to the display register. The actual row selected depends on the
particular LCD drive mode in operation and on the instant in the multiplex sequence.
In 1:4 multiplex mode, all RAM addresses of row 0 are selected, these are followed by
the contents of row 1, 2, and then 3
In 1:3 multiplex mode, rows 0, 1, and 2 are selected sequentially
In 1:2 multiplex mode, rows 0 and 1 are selected
In static mode, row 0 is selected
The PCF85162 includes a RAM bank switching feature in the static and 1:2 multiplex drive
modes. In the static drive mode, the bank-select command may request the contents of
row 2 to be selected for display instead of the contents of row 0. In the 1:2 multiplex mode,
the contents of rows 2 and 3 may be selected instead of rows 0 and 1. This gives the
provision for preparing display information in an alternative bank and to be able to switch
to it once it is assembled.
7.14 Input bank selector
The input bank selector loads display data into the display RAM in accordance with the
selected LCD drive configuration. Display data can be loaded in row 2 in static drive mode
or in rows 2 and 3 in 1:2 multiplex drive mode by using the bank-select command (see
Table 13). The input bank selector functions independently to the output bank selector.
7.15 Blinker
The display blinking capabilities of the PCF85162 are very versatile. The whole display
can blink at a frequencies selected by the blink-select command (see Table 14). The blink
frequencies are fractions of the clock frequency. The ratio between the clock and blink
frequencies depends on the blink mode selected (see Table 6).
An additional feature is for an arbitrary selection of LCD elements to blink. This applies to
the static and 1:2 multiplex drive modes and can be implemented without any
communication overheads. By means of the output bank selector, the displayed RAM
banks are exchanged with alternate RAM banks at the blink frequency. This mode can
also be specified by the blink-select command.
In the 1:3 and 1:4 multiplex modes, where no alternative RAM bank is available, groups of
LCD elements can blink by selectively changing the display RAM data at fixed time
intervals.
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