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W538A802 Schematic ( PDF Datasheet ) - Nuvoton

Teilenummer W538A802
Beschreibung 8-Ch Speech/Melody/LCD Controller
Hersteller Nuvoton
Logo Nuvoton Logo 




Gesamt 13 Seiten
W538A802 Datasheet, Funktion
W538A8XX Data Sheet
8-Ch Speech/Melody/LCD Controller
(ViewTalk TM Series)
1. General description ........................................................................................................................................ 2
2. Features ......................................................................................................................................................... 3
3. PIN description ............................................................................................................................................... 5
4. Electrical Characteristics ................................................................................................................................ 7
4.1. ABSOLUTE MAXIMUM RATINGS....................................................................................................... 7
4.2. D.C. Characteristics ............................................................................................................................. 7
4.3. AC CHARATERISTICS........................................................................................................................ 9
4.4. Main-Clock oscillation Freq Vs. Resistor ........................................................................................... 10
4.5. Sub-Clock oscillation Freq Vs. Resistor............................................................................................. 10
5. Typical Application circuit ............................................................................................................................. 11
5.1 Main clock: Ring type........................................................................................................................... 11
5.2 Main clock: Crystal type ..................................................................................................................... 12
6. Revision History............................................................................................................................................ 13
Publication Release Date: Jul, 2008
- 1 - Revision A5






W538A802 Datasheet, Funktion
W538A8XX Data Sheet
Name
V23
V3-V6
SEG59-SEG56,
SEG51-SEG48
SEG63-SEG60,
SEG55-SEG52
SEG47-SEG16
SEG15-SEG0
COM15-COM0
VDD1_SPK
VSS1_SPK
VSS2_SPK
VDD * 2
VSS * 2
I/O Description
I/O Voltage regulator output pin. It requires an external capacitor (0.1uf).
If the internal pump is enabled (LCDMC1.5 = 0/default), the V2 output level
is controlled by LCDMC0[6:3] If the external reference voltage is selected
(LCDMC1.5 = 1), the V2 input voltage should not be over 1.5 Volts to
prevent chip damage.
The LCD operating voltage (VLCD) is 4 * V2 or 5 * V2, depending on 1/4
bias or 1/5 bias. VLCD should be higher than (VDD - 0.5 V) to prevent chip
leakage currents.
O LCD COM / SEG output driving voltage. Each pin requires an external
capacitor.
LCD segment output pads. These can be shared to provide additional input
O/I pins using register LCDIMC.0 and 1 bit 1. The default function is LCD
segment output pad.
O/O LCD segment output pads. These can be shared to provide additional
output pins using register LCDOMC.0 and 1 bit 1. The default function is
LCD segment output pad.
O LCD segment output pins.
O LCD segment output pins. These can be shared to provide output pins for
key-matrix scanning.
O LCD common output pins.
- Positive power PWM/DAC driver.
- Negative power PWM/DAC driver.
- Negative power PWM/DAC driver.
- Positive power supply. Used by oscillator, uP, logic cells and I/O buffers.
- Negative power supply. Used by oscillator, uP, logic cells and I/O buffers.
3 0.1uF is default value, but the capacitor value should be larger than 0.1uF if the LCD dot size is over 0.5mm * 0.5mm
4. When working at NMOS open drain mode, external pull high voltage can't higher than VDD to avoid leakage current
Publication Release Date: Jul, 2008
- 6 - Revision A5

6 Page









W538A802 pdf, datenblatt
W538A8XX Data Sheet
Main clock: Crystal type
VDDP
(*2)
R5
Switch
C4
VDDP R3
C1
(*4)
VDD
C2
C6
C7
VDDP
W55Fxx
/W551CXX
64Seg x 16COM LCD Panel
VLCD> (VDD-0.5v)
COM0~15
SEG0~63
/RESET
PWM+/DAC
PWM-
VDDP
VDD1
VDD1_SPK
VSS1_SPK
C3
XSEL
VSS2_SPK
XIN
DH1
XOUT W538A8xx DH2
X32I
V6
X32O
BP0
DATA/BP1.0
CLK/BP1.1
ADDR/BP1.2
BP1.3 ~ BP1.7
BP2
V5
V4
V3
V2
VSS2
VSS1
C14
C13
C12
C11
C10
C9
(*5)
VDDP
Q1
8050
R4
(*3)
(*1)
When 1/4 Bias,
V4=V5, C11
can Skip
COMPONENT
Value
C1
4.7uF
C2 ~ C4 C6, C7 C9~C14
0.1uF 15~ 30pF 0.1~1uF
R3 R4
1 ~ 10 470 ~560
Note:
1. C9~C14 depends on LCD panel dot size.
2. Optional R5 equals 100Ω if high noise immunity is needed.
3. For optional DAC application.
4 To be sure chip operation properly, please bond VDD1_SPK and VDD together, bond VSS1_SPK, VSS2_SPK and VSS
together; and connect VSS as closely as possible to battery ground.
- 12 -
Publication Release Date: Jul, 2008
Revision A5

12 Page





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