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UPD16634A Fiches technique(PDF) 5 Page - NEC

No de pièce UPD16634A
Description  300-OUTPUT TFT-LCD SOURCE DRIVER COMPATIBLE WITH 64 GRAY SCALE
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Fabricant  NEC [NEC]
Site Internet  http://www.nec.com/
Logo NEC - NEC

UPD16634A Fiches technique(HTML) 5 Page - NEC

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Data Sheet S12595EJ2V0DS00
5
µµµµPD16634A
4. PIN FUNCTIONS
Pin Symbol
Pin Name
Description
S1 to S300
Driver output
The D/A converted 64-gray-scale analog voltage is output
D00 to D05
Display data input
The display data is input with a width of 36 bits, viz., the gray scale data
D10 to D15
(6 bits) by 6 dots (2 pixels).
D20 to D25
DX0 : LSB, DX5 : MSB
D30 to D35
D40 to D45
D50 to D55
R,/L
Shift direction switching input
These refer to the start pulse input/output pins when cascades are
connected. The shift directions of the shift registers are as follows.
R,/L = H : STHR input, S1
→S300, STHL output
R,/L = L : STHL input, S300
→S1, STHR output
STHR
Right shift start pulse
input/output
R,/L = H : Becomes the start pulse input pin.
R,/L = L : Becomes the start pulse output pin.
STHL
Left shift start pulse input/output
R,/L = H : Becomes the start pulse input pin.
R,/L = L : Becomes the start pulse output pin.
CLK
Shift clock input
Refers to the shift register’s shift clock input. The display data is
incorporated into the data register at the rising edge. At the rising edge of
the 50th clock after the start pulse input, the start pulse output reaches the
high level, thus becoming the start pulse of the next-level driver. The initial-
level driver’s 50th clock becomes valid as the next-level driver’s start pulse
is input. If 52 clock pulses are input after input of the start pulse, input of
display data is halted automatically. The contents of the shift register are
cleared at the STB’s rising edge.
STB
Latch input
The contents of the data register are transferred to the latch at the rising
edge. And, at the falling edge, the gray scale voltage is supplied to the
driver. It is necessary to ensure input of one pulse per horizontal period.
POL
Polarity input
POL = L ; The S2n-1 output uses V0 to V4 as the reference supply; and the S2n
output uses V5 to V9 as the reference supply.
POL = H ; The S2n-1 output uses V5 to V9 as the reference supply; and the
S2n output uses V0 to V4 as the reference supply.
S2n-1 indicates the odd output; and S2n indicates the even output. Input of
the POL signal is allowed the setup time (tPOL-STB) with respect to STB’s
rising edge.
POL2
Data inversion input
POL2 = H : Display data is inverted.
POL2 = L : Display data is not inverted.
V0 to V9
γ-corrected power supplies
Input the
γ-corrected power supplies from outside by using operational
amplifier. Make sure to maintain the following relationships. During the gray
scale voltage output, be sure to keep the gray scale level power supply at a
constant level.
VDD2 > V0 > V1 > V2 > V3 > V4 > V5 > V6 > V7 > V8 > V9 > VSS2
TEST
Test pin
Set it to open.
VDD1
Logic circuit power supply
3.3 V
± 0.3 V
VDD2
Driver circuit power supply
8.0 V
± 0.5 V
VSS1
Logic ground
Grounding
VSS2
Driver ground
Grounding
Cautions 1. The power start sequence must be VDD1, logic input, and VDD2 & V0 to V9 in that order. Reverse
this sequence to shut down.(Simultaneous power application to VDD2 and V0 to V9 is possible.)
2. To stabilize the supply voltage, please be sure to insert 0.1
µµµµF bypass capacitor between
VDD1-VSS1 and VDD2-VSS2. Furthermore, for increase precision of the D/A converter, insertion of a
bypass capacitor of about 0.01
µµµµF is also advised between the γγγγ-corrected power supply
terminals(V0,V1,V2...,V9) and VSS2.
3. We recommend to use Operational Amplifier to lower input impedance of
γγγγ-corrected voltage.


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