PCF8831U Philips Semiconductors, PCF8831U Datasheet - Page 6

• Manufacturer Part Number: PCF8831U
• Description: STN RGB - 160 output row driver
• Manufacturer: Philips Semiconductors

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Philips Semiconductors
7
7.1
The row driver comprises high voltage outputs, level
shifters and logic circuits.
The row driver power supplies are:
2002 Aug 14
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V
V
V
the non-selecting level goes to V
ROWRES2 = LOW (active)
V
V
STN RGB - 160 output row driver
H
L
M
MH
DD
FUNCTIONAL DESCRIPTION
for the bottom level of selecting pulses
for the non-selecting level when ROWRES2 = HIGH;
for the top level of selecting pulses
and V
Row driver
is an intermediate auxiliary supply
SS
for the logic circuits.
SW1
0
0
1
1
SW1
SW2
SW1
SW2
R1F
R1F
SW2
0
1
0
1
R79
R0
LCD ROW OUTPUTS
LCD ROW OUTPUTS
SHIFT REGISTER 1
SHIFT REGISTER 1
SHIFT DIRECTION
SS
when
Fig.3 Row swapping; SW1 = SW2 = 1.
Fig.2 Shift directions; R1F = 1.
R79
R0
6
7.2
Two shift registers of 80 bits each are contained in the
PCF8831 row driver. With ROWRES1, the complete shift
register will be reset at the next rising edge of RCLK. The
two shift registers can be configured for different
applications by row control signals R1F, SW1 and SW2.
7.3
Row control signals SW1, SW2 and R1F control the shift
direction through the register and the order of the register
(see Fig.2). Some switching combinations require the
order of one or both shift registers to be swapped as
shown by the example in Fig.3. All row control
combinations are shown in Table 1, these can be software
controlled when connected to the corresponding row
control signals of the PCF8832 column driver.
SW1
SW2
SW1
SW2
R1F
R1F
80-bit shift register
Row control
R159
R80
LCD ROW OUTPUTS
LCD ROW OUTPUTS
SHIFT REGISTER 2
SHIFT REGISTER 2
SHIFT DIRECTION
MGW630
MGW631
R159
R80
Preliminary specification
PCF8831