A31W33128 Datasheet, PDF (26/34 Pages) AMIC Technology – LCD Controller-Driver

A31W33128 Series
Notes:
1. Sharp variation in the supply voltage or input signal voltage due to strange noises may lead to a malfunction of the IC.
Supply stable supply voltage and input signal voltage.
If you change the level of the supply voltage intentionally, a malfunction may occur. Never change the level of the supply
voltage.
2. When the external bias voltage is input, V5≥V4, V3, V2, V1≥VSS, V5≥VDD. There is no limitation for determining the
voltage level of V1, V2, V3, and V4.
3. Pins A0, CS, E, R/W, C68/80, P/S, OSCI, FNC1 and FNC2.
Pins D0 to D7 during display data write and command input.
Fully swing the levels VIH and VIL of the input signal within the range of power supply voltage so that the state is VIH =VDD,
VIL=VSS. When the level of VIH and VIL is the middle level of the supply voltage, the through current flowing through the
input pin and the current consumption may be increased.
4. Pins D0 to D7 during read.
5. Pins A0 CS, E, R/W, C68/80, P/S, OSCI, FNC1 and FNC2.
6. Pins D0 to D7 during write and high-impedance.
7. ON resistance between LCD drive output pins (SEG1 to SEG128, COM1 to 32, COMICN1, and 2) and LCD drive bias
voltage pins (VI, V2, V3, V4). Using the external LCD power supply, measure the resistance at a 0.1-V difference from the
LCD drive output pin after applying 1/2 voltage of V5 to the LCD drive bias voltage pin.
8. Power save state. When turning the input pin to "Floating," the through current flows and will eventually the power save
effect may be reduced.
9. Shows the current consumption during display including CR oscillation.
It does not include the current consumed by the booster, LCD supply voltage adjustment circuit, voltage regulator, LCD
bias resistor when using the external LCD power supply. The LCD drive output pin is no load. The current consumed by
the LCD panel and wiring capacitor is not included. Measure it without access from the MPU. The current consumed by
the external LCD power supply and external bias resistor and other is not included.
10. The current consumption while the checkered pattern display data are being written from the MPU. The CR oscillation is
measured while the CR oscillating circuit stops. The voltage level of the input signal is the VIH=VDD and VIL=VSS. When
the input signal voltage is in the middle level, the current consumption may be increased. When the display data is written
from the MPU during display, the state is changed to ISS1+lSS2.
11. Shows the standard value at oscillating resistor 1MΩ. Determine appropriate oscillating frequency so as not to be in
synchronization with the frame frequency and other frequency such as the fluorescent lamps.
12. Shows the wait time from when the power voltage rises to 80 of the specified voltage to when the command input
becomes available.
13. The operating voltage range of the booster.
14. Shows the operating voltage range of the LC voltage adjustment circuit, voltage follower, and LCD bias resistor. The
operating voltage range differs depending upon each bias setting value. To adjust V5 with the LCD voltage adjustment
circuit, it is necessary to set the voltage within the bias voltage. IV5I - IVOUT I ≥ 0.2V.
15. The operating voltage range of the LCD driver after the voltage follower functions. Also, it shows the voltage range of V1 to
V5 supplied from the external LCD power supply circuit.
16. Shows the value of the current consumed by the booster, LCD voltage adjustment circuit, voltage follower, LCD bias
resistor, and LCD driver. It does not include the value IRREG=V5/(R1+R2+R3) of the current flowing through external
resistors R1, R2, and R3. Set the command fine adjustment data to 1000. Outputs the checkered patterns from the LCD
drive output pin. The pin is measured at "Open." Current consumption of the IC during display is ISSL+lSS1.
17. The built-in LCD power supply circuit stops when FNC1 and 2 are "H." Current consumption only for the LCD driver.
Outputs the checkered patterns from the LCD drive output pin. The pin is measured at "Open." Current consumption of the
IC during display is IV5+ lSS1.
When using the external power supply, stop the built-in power supply circuit which does not need to be operated with pins
FNC1 and 2 to prevent the IC from being broken due to a shorting of the internal power supply.
18. The reference voltage differs depending upon the temperature coefficient selected with the corresponding command.
19. Constant current which flows into the LCD Voltage Command Fine Adjustment Circuit of the IC, for the Fine adjustment
data (1111).
Increasing the Fine adjustment data by 1 bit, V5 increases by Rb x IREF/15.
20. For the Chips deliveries, chips are delivered after they satisfy their LCD drive bias voltages are 0.08V in the delivery testing
at 25°C.
PRELIMINARY (December, 2000, Version 0.1)
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AMIC Technology, Inc