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PT8A2515TAEX

P1-P3P4-P6
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Simple Timer
2013-07-0010 PT0272-3 08/01/13
1
PT8A2515
Features
Operating voltage: 3.5V~5.5V
Have Reset function
Relay output disable without external oscillator
Adjustable Timer: 30s~20mins
Few external components
Low cost TO-94 and SOT23-5 package
Applications
Toaster Controller
Timer
Description
The PT8A2515 is a CMOS LSI chip designed for
timer applications, the time can be adjusted by external
R/C. It has reset function.
The chip includes: Power on reset circuit, Logic
control circuit, Output driver circuit, Key scan circuit,
timer circuit, Built-in internal oscillator and external R/C
oscillator circuit etc. It is enclosed in lead free TO-94 and
SOT23-5 package.
Block Diagram
Power On
Reset
Circuit
Logic control
OSC/RESET
Timer
VCC
GND
Oscillator
Output RELAY
Key
scan
Driver
Oscillator
System
Oscillator
OSC
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2013-07-0010 PT0272-3 08/01/13
2
PT8A2515
Simple Timer
Pin Configuration
PT8A2515
SOT23-5
1
2
3
5
4
OSC
GND
VCC Relay
NC
Pin Description
Pin No.
Pin Name
I/O
TO-94
SOT23-5
1
4
Relay
O
2
3
VCC
I
3
1
OSC
I/O
4
2
GND
I
-
5
NC
-
Function Description (Refer to Block Diagram)
The chip mainly includes: Power on reset circuit, Logic
control circuit, Output driver circuit, Key scan circuit, timer
circuit, external R/C oscillator circuit and internal oscillator
circuit etc.
Power on reset circuit
Internal power on reset circuit will reset all the logic circuit and
the timer; it will clear all output pins when power on.
Logic control circuit
The logic circuit will carries out all the logic control function.
It will check OSC pin status, then control the output drive
circuit, when timer is out, it will pull down Relay pin to release
relay.
Output driver circuit
The pin Relay will drive a relay.
Key scan circuit
This circuit will detect “Reset/Restart” key at OSC have a low
negative pulse, it will active the corresponding work status.
When IC worked at timer, it will reset the timer; when timer is
out, it will reset the timer and restart the output.
Timer circuit
This circuit will provide a timer to logic control circuit. When
Fosc = 8.192 KHz, timer output is 245720/8192=30s.
External R/C Oscillator circuit
This will produce a system frequency depend on external
resistor and cap, the frequency is about 8.192 KHz when
R1=47 KΩ and C1=332. (Refer to Fig 1).
Note: The system frequency with external resistor and cap
must be between 180Hz to 20 KHz.
Internal oscillator
An on-chip RC oscillator with frequency about 256 KHz is
used to check the input signal and the wrong statue of external
RC oscillator.
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2013-07-0010 PT0272-3 08/01/13
3
PT8A2515
Simple Timer
Maximum Ratings
Storage Temperature…………………………………………..- 40
o
C to +125
o
C
Supply Voltage to Ground Potential (Inputs & V
CC
only)……- 0.5 to V
CC
+0.5V
Supply Voltage to Ground Potential (Outputs & D/O only) …- 0.5 to V
CC
+0.5V
DC Input Voltage …………………………………………- 0.5V to V
CC
+0.5V
DC Output Current ……………………………………………………… 20mA
Power Dissipation……………………………………………………… 500mW
Recommended Operation Conditions
Sym
Description
Min
Typ
Max
Unit
V
CC
Supply voltage.
3.5
5.0
5.5
V
V
IH
“H” Input Voltage
0.8 V
CC
-
-
V
V
IL
“L” Input Voltage
-
-
0.35 V
CC
V
T
A
Operation temperature
0
25
85
C
DC Electrical Characteristics
(Unless otherwise noted, V
CC
= 5V, T
A
= 0 ~ 85ºC)
Symbol
Parameter
Test Condition
Min
Typ
Max
Unit
I
OH
Output Source Current (Relay)
V
OH
=4.5V
-10
-
-
mA
I
OL
Output Sink Current(Relay)
V
OL
=0.5V
10
-
100
uA
F
OSC
Frequency of normal oscillator
R1=47KΩ C1=332, see
Fig 1
7808
8192
8576
Hz
I
CC
Power supply current
V
CC
=5V, R1=47 KΩ,
C1=332, all output
floating. See Fig 1
-
-
500
A
CURRENT
POWER
METER
SUPPLY
R1
47K
C1
332
GND
4
OSC/RESET
3
VCC
2
RELAY
1
IC
PT8A2515/6NE
Fig1 Test circuit
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
OSC
P1-P3P4-P6

PT8A2515TAEX

Mfr. #:
Buy PT8A2515TAEX
Manufacturer:
Diodes Incorporated
Description:
Timers & Support Products Simple Timer
Lifecycle:
New from this manufacturer.
Delivery:
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