SC9318FA Ver la hoja de datos (PDF) - Silan Microelectronics
Número de pieza
componentes Descripción
Fabricante
SC9318FA Datasheet PDF : 28 Pages
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SC9318-033
(Continued)
Pin No. Symbol
Description
60
VXT
Voltage double boosting pin;
61
VLCD
Voltage doubler boosting pin for driving the LCD.
A capacitor (0.1µF Typ.) is connected to boost the voltage.
62
C1
The VLCD pin outputs voltage (3.0V), which has been doubled from the constant
voltage (VEE: 1.5V) using the capacitors connected between C1 and C2. That
potential is supplied to the LCD drivers. If the internal VLCD OFF bit is set to “1”by
program, an external power supply can be input through the VLCD pin to drive the
63
C2
LCD.
At this time, the VLCD/2 potential, whose VLCD voltage is divided using registers, is
output from the C2 pin.
Constant voltage supply pin;
1.5V constant voltage supply pin for driving the LCD.
64
VEE
A stabilizing capacitor (0.1µF Typ.) is connected. This is a reference voltage for the
A/D converter, key input, and the LCD common output’s bias potential.
Note: 1. When the device is reset (voltage higher than 1.8V, or when RESET =low→high), I/O ports are set to input,
the pins for I/O ports and additional functions (e.g., A/D converter) are set to I/O port input pins, while
the IFIN/IN pins become IF input pins.
2. When in PLL OFF mode (when the three bits in the internal reference ports all show “1”), the IFIN and
FMIN, AMIN pins are pulled down, and DO1 And DO2 are at high impedance.
3. When in CLOCK STOP mode (during execution of CKSTP instruction), the output port and the LCD
output pins are all at low level, while the constant voltage circuit (VEE), the voltage doubler circuit (VLCD),
and the power supply for the crystal oscillator (VXT) are all off.
4. When the device is being reset, the contents of the output ports and internal ports are undefined and
initialization by program is necessary.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2 2003.05.20
Page 9 of 29
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