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參數(shù)資料
| 型號： | PT8A978P |
| 廠商： | Pericom Semiconductor Corp. |
| 英文描述： | 5-Function Remote Controller |
| 中文描述： | 5功能遙控器 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 96K |
| 代理商： | PT8A978P |
Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
PT0074(10/01)
Ver:1
1
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Features
PT8A977P/977W works as encoder and
PT8A978P/978LW works as decoder
Five pins for five control functions
Operating power-supply voltage: 2.5V to 5.0V
(977P, 977W, 978P), 2.0V to 5.0V (978LW)
Auto-power-off if no press on any button in 8s or
continuously press on any button over 4 minues
Press on any button as wake up (977P, 977W)
Manual-power-off with OFF button
One output pin used for external power control (977P,
977W)
On-chip oscillator with an external resistor
On-chip reversing amplifiers (978P, 978LW)
Low operating current
Few external components needed
Package: 14-pin DIP, 14-pin SOIC, 16-pin DIP
and 16-pin SOIC
General Description
The PTA977P (or 977W) and PT8A978P (or 978LW)
provide a complete control functions to the remote-
controlled toy. The PT8A977P/977W has five input
pins corresponding with the five function buttons i.e,
forward, backward, rightward, leftward and turbo. The
encoding circuit in the PT8A977P/977W 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 PT8A978P (or 978LW) 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.
There is an internal oscillator in the PT8A977P/977W
and 978P/978LW 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
PT8A977P/977W and PT8A978P/978LW must be
less than ±25%.
The auto-power-off function is achieved by an internal
counter. The PC output is used to control on/off state
of the external power supply. Pressing OFF button
can also shut down the power supply. Press on any
function button will wake up the chip promptly.
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Ordering Information
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