pcf8548 NXP Semiconductors, pcf8548 Datasheet - Page 17

• Manufacturer Part Number: pcf8548
• Description: 65 X 102 Pixels Matrix Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 2 Explanations of symbols in Table 1
12.1
After power-on a reset pulse must be applied immediately to the chip, as it is in an undefined state. A reset of the chip
can be achieved using the external reset pad. After the reset the LCD driver is set to the following states:
1999 Aug 16
PD
V
H
MX
MY
TRS
BRS
DO
PRS
D and E
TC[1:0]
S[1:0]
BS[2:0]
V
op
Power-down mode (PD = 1)
All LCD outputs at V
Horizontal addressing (V = 0)
Normal instruction set (H = 0)
Normal display (MX = MY = TRS = BRS = 0)
Display blank (E = D = 0)
Address counter X[6:0] = 0 and Y[3:0] = 0
Temperature coefficient (TC[1:0] = 0)
Bias system (BS[2:0] = 0)
V
After power-on (RAM data is undefined), the reset signal does not change the content of the RAM.
65
LCD
[6:0]
External reset (RES)
is equal to 0, the HV generator is switched off (V
BIT
102 pixels matrix LCD driver
00
10
01
11
00
01
10
11
00
01
10
11
chip is active
horizontal addressing
use basic instruction set
normal X addressing
display is not vertically mirrored
top rows are not mirrored
bottom rows are not mirrored
MSB is on top
V
display blank
normal mode
all display segments on
inverse video mode
V
V
V
V
2
3
4
5
bias system
V
SS
LCD
LCD
LCD
LCD
LCD
LCD
voltage multiplier
voltage multiplier
voltage multiplier
voltage multiplier
(display off)
programming range LOW
temperature coefficient 0
temperature coefficient 1
temperature coefficient 2
temperature coefficient 3
programming
0
op
[6:0] = 0 and PRS = 0)
17
chip is in Power-down mode
vertical addressing
use extended instruction set
X address is mirrored
display is vertically mirrored
top rows are mirrored
bottom rows are mirrored
LSB is on top
V
LCD
programming range HIGH
1
1
0
0
0
0
0
0
0
0
D = 0
E = 0
TC[1:0] = 00
S[1:0] = 00
BS[2:0] = 000
V
op
Product specification
[6:0] = 0000000
RESET STATE
PCF8548