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Pericom Semiconductor Corporation

PT8A978BL Datasheet Preview

PT8A978BL Datasheet

5-Function Remote Controller

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PT8A977B/978B/978BL
5-Function Remote Controller
Features
Description
• PT8A977B works as encoder and PT8A978B/
978BL works as decoder
• Five pins for five control functions
• Operating power-supply voltage: 2.5V to 5.0V (978B),
2.0V to 5.0V (978BL), 1.8V to 5.0V(977B)
• Auto-power-off and oscillation-off if no press on
any button (977B)
• Press on any button to wake up (977B)
• One output pin used for external power control
(977B)
• On-chip oscillator with an external resistor
• On-chip reversing amplifiers (978B, 978BL)
• Low operating current
• Few external components needed
• Package: 14-pin DIP, 14-pin SOIC, 16-pin DIP
, 16-pin SOIC, die form and wafer form
The PT8A977B and PT8A978B (or 978BL) provide
complete control functions to the remote-controlled toy.
The PT8A977B has five input pins corresponding with
the five function buttons i.e, forward, backward, rightward,
leftward and turbo. The encoding circuit in the PT8A977B
sends digital codes to the two output pins SO and SC.
The digital codes correspond to the definite function
buttons or their combinations. The SO and SC outputs
are used in wireless and infra-red applications
respectively.
The PT8A978B (or 978BL) has five output pins
corresponding with the five actions. The received signals
are amplified by the three-stage amplifier, and then the
appropriate amplified signals are sampled, fault-tolerantly
checked and decoded to control the actions of the remote-
controlled toy.
Ordering Information
Part No.
Pa ck a ge
PT8A977BPE
Lead free 14-pin DIP
PT8A977BWE
PT8A977BDE
Lead free and Green 14-pin
SOIC
Die Form
PT8A977BUWF
Wafer Form
PT8A978BPE
Lead free 16-pin DIP
PT8A978BLWE
Lead free and Green 16-pin
SOIC
PT8A978BDE
Die Form
PT8A978BUWF
Wafer Form
Note:
Adding E= Pb-free or Pb-free and Green
Adding X suffix=Tape/Reel
There is an internal oscillator in the PT8A977B and 978B/
978BL respectively. By adding an external resistor
conveniently, the oscillator will be constructed. The
oscillator frequency can be adjusted by the external
resistor. The relative error between the frequencies of
the two on-chip oscillators in the PT8A977B and
PT8A978B/978BL must be less than ±25%.
The auto-power-off function is achieved by an internal
counter (977B). The PC output is used to control on/off
state of the external power supply. Press on any function
button will wake up the chip promptly.
12-07-0007
1 PT0085-10 07/06/2012




Pericom Semiconductor Corporation

PT8A978BL Datasheet Preview

PT8A978BL Datasheet

5-Function Remote Controller

No Preview Available !

Block Diagram
Block Diagram of 977B
OSCI
OSCO
Right
Left
Turbo
Forward
Backward
Oscillator
Input
Circuit
PT8A977B/978B/978BL
5-Function Remote Controller
OFF
Timing
Generator
PC
Encoding
Circuit
Output
Circuit
SO
SC
Block Diagram of 978B/978BL
OSCI
OSCO
Oscillator
Timing
Generator
SI Amp.
VI1 Amp.
VI2 Amp.
Signal Sample &
Fault-Tolerant
Check
VO1
VO2
Latch
Decoding
Circuit
Output
Circuit
Control
Logic
Right
Left
Turbo
Forward
Backward
LD
RD
Pin Configuration
12-07-0007
PT8A977BP/977BW
14-Pin DIP/14-Pin SOIC
PT8A978BP/978BLW
16-Pin DIP/16-pin SOIC
Right
Test
GND
Backward
Forward
Turbo
SC
1
2
3
4
5
6
7
14 Left
13 OFF
12 OSCI
11 OSCO
10 PC
9V
CC
8 SO
VO2
GND
SI
OSCI
OSCO
Right
Left
RD
1
2
3
4
5
6
7
8
16 VI2
15 VO1
14 VI1
13 V
CC
12 Turbo
11 Forward
10 Backward
9 LD
Top View
2 PT0085-10 07/06/2012


Part Number PT8A978BL
Description 5-Function Remote Controller
Maker Pericom Semiconductor Corporation
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PT8A978BL Datasheet PDF






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