HT47C20 View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
'HT47C20' PDF : 56 Pages View PDF
HT47C20
Pad Description
Pad No.
Pad Name
I/O
Mask
Option
Function
1
RES
I
¾
Schmitt trigger reset input. Active low.
Bidirectional 8-bit input/output port. The low nibble of the PA can be
configured as CMOS output or NMOS output with or without
2
PA0/BZ
Wake-up pull-high resistors (mask option). NMOS output can be configured
3
PA1/BZ
Pull-high as Schmitt trigger input with or without pull-high resistors. Each bit of
4
PA2/IR
I/O or None NMOS output can be configured as wake up input by mask option.
5
PA3/PFD
CMOS or Of the eight bits, PA0~PA1 can be set as I/O pins or buzzer outputs
6~9
PA4~PA7
NMOS by mask option. PA2 can be set as an I/O pin or an IR carrier output
also by mask option. PA3 can be set as an I/O pin or a PFD output
also by mask option.
10
11
12
13
PB0/INT
PB1
PB2/TMR
PB3
Four-bit Schmitt trigger input port. The PB is configured as with
pull-high resistors. Of the four bits, PB0 can be set as an input pin or
I
¾
an external interrupt input pin (INT) by software application. While
PB2 can be set as an input pin or a timer/event counter input pin
also by software application.
14
VSS
¾
¾
Negative power supply, ground
18
IN1
17
CS1
16
RS1
15
RT1
I
Oscillation input pin of channel 1
O
O
¾
Reference capacitor connection pin of channel 1
Reference resistor connection pin of channel 1
O
Resistor sensor connection pin for measurement of channel 1
23
IN0
22
CS0
21
RS0
20
CRT0
19
RT0
I
Oscillation input pin of channel 0
O
Reference capacitor connection pin of channel 0
O
O
¾
Reference resistor connection pin of channel 0
Resistor/capacitor sensor connection pin for measurement of chan-
nel 0
O
Resistor sensor connection pin for measurement of channel 0
27
26~24
SEG19/COM3
COM2~COM0
O
1/3 or 1/4
Duty
SEG19/COM3 can be set as a segment or a common output driver
for LCD panel by mask option. COM2~COM0 are outputs for LCD
panel plate.
28~46 SEG18~SEG0 O
¾
LCD driver outputs for LCD panel segments
49, 48, 47 V1, V2, V3
51, 50 C1, C2
¾
¾
Voltage pump
52
OSC4
53
OSC3
O
I
¾
Real time clock oscillators
54
VDD
¾
¾
Positive power supply
55
OSC2
56
OSC1
O Crystal or OSC1 and OSC2 are connected to an RC network or a crystal
I
RC (by mask option) for the internal system clock.
Absolute Maximum Ratings
Supply Voltage .........................................-0.3V to 5.5V
Storage Temperature ............................-50°C to 125°C
Input Voltage..............................VSS-0.3V to VDD+0.3V
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. 1.60
5
July 26, 2002
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