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8A977P

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Features

?PT8A977B works as encoder and PT8A9781 works as decoder

?Four control functions

?Operating power-supply voltage: 1.8V to 5.0V(977B)

1.0V to 1.5V (9781)

?Auto-power-off and oscillation-off if no press on any button (977B)

?Press on any button to wake up (977B)

?On-chip oscillator with an external resistor (977B)?On-chip oscillator with an external resistor and capacitor (9781)

?On-chip amplifiers (9781)

?Low operating current

?Few external components needed General Description

The PT8A977B and PT8A9781 provide a complete control functions to the remote-controlled toy. The PT8A9781 has four output pins corresponding with the four actions i.e, forward, backward, right, left. 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 PT8A9781. By adding an external resistor and capacitor conveniently, the oscillator will be constructed. The external resistor and capacitor can adjust the oscillator frequency. The relative error between the frequencies of the two on-chip oscillators in the PT8A977B and PT8A9781 must be less than ±25%.

Part No.Package

PT8A977BP14-pin DIP

PT8A977BW14-pin SOIC

PT8A977BDE Die Form

PT8A9781W16-pin SOIC

PT8A9781DE Die Form Ordering Information

Block Diagram of 977B

Block Diagram of 9781

Pin Configuration

PT8A977BDE

PT8A9781DE

Pin/Pad Description of 9781Pin/Pad Name Description

VI2

VO2SI OSCI OSCO Right Left Backward Forward FOUT DVDD VI1VO1AGND Input pin for the amplifier 2

Output pin for the amplifier 2

Input pin of the encoding signal

Oscillator input pin Oscillator output pin Rightward output pin

Leftward output pin

Backward output pin Forward output pin Output pulse with 50% duty cycle, fequency is about 64kHz.Digital power supply, bonded to AVDD as V CC Input pin for the amplifier 1Output pin for the amplifier 1Analog ground, bonded to DGND as GND Pin/Pad Description

Pin/Pad Description of 977B Pin No.

1 2 5 6 4 7 8 3 9 10 11 12 13 14

Pin/Pad Name OFF Backward GND Forward Test Turbo SC SO V cc PC OSCO OSCI Left

Right Description

With Pull-up resistor, this pin is used to shut down the external power supply.With Pull-up resistor, backward function selected if this pin connected to GND.Negative power supply

With Pull-up resistor, forward function selected if this pin connected to GND.With Pull-up resistor, turbo function selected if this pin connected to GND.With Pull-up resistor, leftward function selected if this pin connected to GND.

With Pull-up resistor, rightward function selected if this pin connected to GND.With Pull-up resistor, this pin is used for testing mode.Output pin of the encoding signal with carrier frequency Output pin of the encoding signal without carrier frequency Positive power supply Power control output pin Oscillator output pin Oscillator input pin

Note: additional V CC may be needed for on-chip analog circuit.

VR Amplifier bias voltage AVDD Analog power supply, bonded to DVDD as V CC DGND

Digital ground, bonded to AGND as GND 1 2 5 6 4 7 8 3 9 10 16

12 13 14 Pin No.

15GND V CC

Maximum Ratings

(Above which the useful life may be impaired. For user guidelines, not tested)Storage Temperature ..............................................................-25o C to +85o C Ambient Temperature with Power Applied..........................10o C to +40o C Supply Voltage to Ground Potential

(Inputs & V CC Only) (977B)..................................................-0.5 to +6.0V Supply Voltage to Ground Potential

(Outputs & D/O Only) (977B)..............................................-0.5 to +6.0V DC Input Voltage (977B)..........................................................-0.5 to +6.0V Supply Voltage to Ground Potential

(Inputs & V CC Only) (9781)..................................................-0.5 to +5.0V Supply Voltage to Ground Potential

(Outputs & D/O Only) (9781)..............................................-0.5 to +5.0V DC Input Voltage (9781)..........................................................-0.5 to +5.0V DC Output Current................................................................................20mA Power Dissipation ..............................................................................500mW

Note:

Stresses greater than those listed under MAXI-MUM RATINGS may cause permanent damage to the device. This is a stress rating only and func-tional operation of the device at these or any other conditions above those indicated in the opera-tional sections of this specification is not implied.Exposure to absolute maximum rating conditions for extended periods may affect reliability.

DC Electrical Charateristics

DC Electrical Charateristics of 977B

1.8 4.0 5.0 V

Parameters

Description

Test Condition Min. Type Max. Units

I CC Supply Current Output unloaded 100 uA

V IL Input Low Voltage Guaranteed Logic LOW level 0.8 V I IL Input Low Current -60 uA I OH

Output High Current

I OL Output Low Current V OUT = 3.5 V -1.0 mA

V OUT = 0.5 V 150 uA V CC

Operating Voltage I STB

Stand-by Current OFF State 5 uA V IH Input High Voltage Guaranteed Logic HIGH level 3.0 V

I IH Input High Current Pin 1, 4, 5, 6, 14 V IH = 4V, ON state 10 uA

Pin 1, 4, 5, 6, 14 V IL = 0V, ON state Pin 7, 8, 10Pin 11

V OUT = 3.5 V -500 uA

Note : Over the Operating Rating, 0O C ≤ T A ≤ 70O C, V CC = 4V

I I Input Current

Pin 12 V IH = 0 ~ 4V, ON state ±10 uA

AC Electrical Characteristics

AC Electrical Characteristics of 977B

Note : Over the Operating Rating, 0O C ≤ T A ≤ 70O C, V CC = 4V

* The relative error between the frequencies of the two on-chip oscillators in the PT8A977B and PT8A9781 must be less than ±25%.

AC Electrical Characteristics of 9781

Parameters Description Test Condition Min. Type Max. Units f OSC

Oscillator Frequency *

t FUN Cycle Time of Function Code t STA

Cycle Time of Start Code Carrier Frequency of SC Pin

T A = 25O C, R = 200 k ? 102 128 154 κΗz f OSC = 102 to 154 kHz 0.8 1 1.2 ms f OSC = 102 to 154 kHz 1.6 2 2.4 ms f OSC = 102 to 154 kHz 51 64 77 kHz

f CSC

Oscillator Frequency Fluctuation T A =25O C, V CC = 1.8 ~ 5V 15 k Ηz f max -f min

T A = 10~40°C, V cc = 1.0V~1.5V

* The relative error between the frequencies of the two on-chip oscillators in the PT8A977B and PT8A9781 must be less than ±25%.

DC Electrical Charateristics of 9781

T A = 10~40°

C, V cc = 1.0V~1.5V * 2.2M ? feedback resistors for the two reversing amplifiers; 9.1k ? external resistor and a 180pf capacitor for the on-chip oscillator.

Typical Application of PT8A977B For Transmit Circuit

Notes

Pericom Technology Inc.

Email: support@https://www.wendangku.net/doc/9411089888.html, Web Site: https://www.wendangku.net/doc/9411089888.html,, https://www.wendangku.net/doc/9411089888.html,

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Tel: (86)-21-6485 0576Fax: (86)-21-6485 2181

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Tel: (1)-408-435 0800Fax: (1)-408-435 1100

Pericom Technology Incorporation reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. Pericom Technology does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom Technology product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom Technology Incorporation.