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BL55070 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - LCD Driver - BELLING

भाग संख्या BL55070
समारोह LCD Driver
मैन्युफैक्चरर्स BELLING 
लोगो BELLING लोगो 
पूर्व दर्शन
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<?=BL55070?> डेटा पत्रक पीडीएफ

BL55070 pdf
BL55070
Shanghai Belling Corp., Ltd
zip: 200233 Tel: 86-021-64850700 Fax: 86-021-64855865
4 Pin Description
Pin No.
9
10
11
12
13
14-17
18-441-8
Pin name
SDA
SCI
Vdd
Vss
Vlcd
Com0Com2Com1Com3
S0——S34
Function
Serial data input/output
Serial clock input
Supply voltage
ground
LCD supply voltage
Common terminal driving output
Segment terminal driving output
Tab.1
5 Function Description
1.function circuit
The BL550070 has all function circuits that can directly drive any static or multiplexed
LCD containing up to four commons and up to 35 segments. The function circuits
include:Power-on reset, LCD bias generator, LCD voltage selector, Oscillator, display RAM,
Timing, Display latch, Shift register, Common/segment outputs, input/output bank selector,
Blinker, Data pointer, etc.
2.display function decription
The display RAM is a static 35x 4-bit RAM which stores LCD data. A logic 1 in the
RAM bit-map indicates the on state of the corresponding LCD segment; similarly, a logic 0
indicates the off state. There is a one-to-one correspondence between the RAM addresses and
the segment outputs, and between the individual bits of a RAM word and the common
outputs. (see Fig.2).
COM
(Com0~
Com3)
输出
Display RAM address and SEGMENTS0~S34output
0 1 2 3 。 。 。 。 31 32 33
0
1
2
3
Fig2
34
When display data is transmitted to the BL55070, the display bytes received are stored
in the display RAM in accordance with the selected LCD drive mode. To illustrate the filling
order, an example of a 7-segment numeric display showing all drive modes is given in Fig.3;
the RAM filling organization depicted applies equally to other LCD types.
2

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