HT47C20L 데이터 시트보기 (PDF) - Holtek Semiconductor
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HT47C20L Datasheet PDF : 45 Pages
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HT47C20L
Pin Description
Pin Name I/O
Mask
Option
Function
RES
I
¾
Schmitt trigger reset input. Active low.
PA0/BZ
PA1/BZ
PA2
PA3/PFD
PA4~PA7
Bidirectional 8-bit input/output port. The low nibble of the PA can be config-
Wake-up ured as CMOS output or NMOS output with or without pull-high resistors
Pull-high (mask option). NMOS output can be configured as Schmitt trigger input
I/O
or None
with or without pull-high resistors. Each bit of NMOS output can be config-
CMOS or ured as wake up input by mask option. Of the eight bits, PA0~PA1 can be
NMOS
set as I/O pins or buzzer outputs by mask option. PA3 can be set as an I/O
pin or a PFD output by mask option.
PB0/INT
Four-bit Schmitt trigger input port. The PB is configured as with pull-high
PB1
PB2/TMR
I
¾
resistors. Of the four bits, PB0 can be set as an input pin or an external in-
terrupt input pin (INT) by software application. While PB2 can be set as an
PB3
input pin or a timer/event counter input pin by software application.
VSS
¾
¾
Negative power supply, ground
V1~V3, C1~C2 ¾
¾
Voltage pump
SEG19/COM3
COM2~COM0
O
1/2 or 1/3 or 1/4 SEG19/COM3 can be set as a segment or a common output driver for LCD
Duty
panel by mask option. COM2~COM0 are outputs for LCD panel plate.
SEG18~SEG0 O
¾
LCD driver outputs for LCD panel segments
VDD
¾
¾
Positive power supply
OSC2
OSC1
O
I
¾
OSC1 and OSC2 are connected to a 32768Hz crystal for the internal sys-
tem clock and WDT source.
IN0
CS0
RS0
CRT0
RT0
I
Oscillation input pin of channel 0
O
Reference capacitor connection pin of channel 0
O
¾
Reference resistor connection pin of channel 0
O
Resistor/capacitor sensor connection pin for measurement of channel 0
O
Resistor sensor connection pin for measurement of channel 0
IN1
I
Oscillation input pin of channel 1
CS1
RS1
O
O
¾
Reference capacitor connection pin of channel 1
Reference resistor connection pin of channel 1
RT1
O
Resistor sensor connection pin for measurement of channel 1
TEST
I
¾
TEST mode input pin with pull-high resistor.
It disconnects in normal operation.
Absolute Maximum Ratings
Supply Voltage ...........................VSS-0.3V to VSS+2.5V
Input Voltage..............................VSS-0.3V to VDD+0.3V
Storage Temperature ............................-50°C to 125°C
Operating Temperature...........................-40°C to 85°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
Rev. 2.30
4
December 2, 2005
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