NEC type infrared remote transmission circuit the first page

  V6122

The first page

NEC special type of infrared remote control transmitting circuit

describe

  V6122 is a integrated circuit used in the infrared remote control system in special launch,

made by CMOS technology. It can be an external 64 keys,

one of the three groups of double buttons. V6122 packaging format for the SOP - 24.

The main features

* Wide working voltage range (VDD = 2.0 ~ 3.6 V)

* low power consumption, static current < 1 ma)

* working frequency of 455 KHZ, the output of 38 KHZ carrier frequency

* the PPM (pulse position modulation) encoding

* through the selection of SEL pin, can support 128 + 6 instruction code

* the user can select encoding

application

* TV, VCR

* combination stereo equipment

* cable TV tuner

* recording booth

* air conditioner

* VCD, DVD players

Product specification classification

The internal block diagram

Limit parameter (unless specified otherwise, Tamb = 25 ? C)

parameter	Operator,	parameters	unit
The biggest power supply voltage	VDD	4.0	V
The input voltage	VIN	-0.3~VDD	V
Power consumption	PD	250	mW
storage temperature	Tstg	-40~+125	°C
Working temperature	Topr	-20~+75	°C

  Recommended operating conditions
(unless specified otherwise, Tamb = 25 ? C)

parameter	symbol	The minimum value	Typical values	The maximum	unit
The power supply voltage	VDD	2.0	3.0	3.6	V
Oscillation frequency	fosc	400	455	500	KHz
The input voltage	VIN	0	--	VDD	V
User code select pull-up resistor	Rup	--	100	--	KΩ

  Electrical parameters
(unless specified otherwise, Tamb = 25 ? C, VDD = 3.0 V)

parameter	symbol	The test conditions	The minimum value	ical values	The maximum	unit
The power supply voltage	VDD		2.0	3.0	3.6	V
工Working current	ICC1	fosc=455kHz		0.1	1.0	mA
The static current	ICC2	Stop the vibration			1.0	mA
REM high level output current	IOH1	Vo=2.7V	-2.0	-3.0		mA
REM low-level output current	IOL1	Vo=0.3V	0.5	1.0		mA
LMP high level output current	IOH2	Vo=2.7V	-0.1	0.2		mA
The LMP low-level output current	IOL2	Vo=0.3V	1.5	2	3	mA
KI high level input current	IIH1	VIN =3.0V	5		30	mA
KI low-level input current	IIL1	VIN =0V			-0.2	mA
KI high input voltage	VIH1		0.7 VDD		VDD	V
KI low-level input voltage	VIL1		0		0.3 VDD	V
KI/O high input voltage	VIH2		0.7 VDD		VDD	V
KI/O low-level input voltage	VIL2		0		0.4	V
KI/O high level input current	IIH2	VIN =3.0V	1		7	mA
KI/O low-level input current	IIL2	VIN =0V			-0.2	mA
KI/O high level output current	IOH3	Vo=2.5V	0.5		4	mA
KI/O low-level output current	IOL3	Vo=1.7V	0.1		2.5	mA
CCS low-level input voltage	VIH3		0.1			V
CCS high level input current	IIH3	The VIN = 3.0 V			0.2	mA
CCS low-level input current	IIL3	The drop-down VIN = 0 v	-3		-15	mA

Pin diagram

Pin description

Pin number	symbol	I/O	Functional description
23,24,1~6	KI0~KI7	I	Key scanning input.
7	REM	O	Remote control output
8	VDD	--	The power is end.
9	SEL	I	D7 data selection.
10	OSCO	O	Oscillator pin (output).
11	OSCI	I	Oscillator pin (input).
12	Vss	--	Negative power supply.
13	LMP	O	The output LED indicator, low level effectively.
21~14	KI/O0~KI/O7	I/O	Key scanning input/output pin.
22	CCS	I	CCS is low 8 user code scanning input.

Functional specifications

1. The encoding

  V6122 emitted a frame code contains a boot code, 16 user code and eight key data code.

Key data code radix-minus-one complement is transferred at the same time.

Below this size frame structure is presented.

  Boot code by a carrier wave 9 ms and 4.5 ms constitute close time, it as the launch of the

code then guide. So, when the receiving system is composed of microprocessor,

can more effectively deal with code of receiving and temporal relationship between testing and

other various control. Coding using pulse position modulation (PPM).

Using the time interval between pulses to distinguish between "0" and "1".

Every 8 bits of data code is sent at the same time,

their radix-minus-one complement can be transmitted, to greatly reduce the system ber.

2. The keyboard matrix

Please refer to the below V6122 keyboard input matrix.

3. The key input

  V6122 in key scanning input KI0 ~ KI3 and key scanning timing signal input/output

KI/O0 - KI/O7 on 8 by 8 matrix composed of a total of 64 keys can be set up.

  Only 21 # key with other KI/O5 online key # # 22, 23, 24 # key combination to achieve

dual keys function. That is only the following key combinations can be double operation. 

(1) 21 # key and 22 # key; (2) 21 # key and 23 # key; (3) 21 # key and 24 # key

  Each key between the input and negative power supply Vss were a pulldown resistor.

When there is more than a button (except double button) press at the same time,

yards of emission output will stop.

  When a key press, first read the user code and key data code, after 36 ms,

remote control output (REM) start output, key time only more than 36 ms,

can output a frame size. After more than 108 ms to output the second frame code.

4. Double key coding

  Double keys function is very useful for recording as a recording function such as,

the table below gives the three double key data code of the key.

(please refer to the "key input" section)

Note: when are connected to the Vss SEL, D7 = 1; SEL when connected to VDD, D7 = 0.

5. Remote control output waveform

V6122 output waveform as shown in the figure below:

6. User code set

  Pictured above, whether by the KIO and CCS diode, KIO and VDD to decide whether to meet

100 k resistance 6122 16-bit user code. S0 ~ S7 said KI/O0 - KI/O7 with CCS the diode connection

status, pick up to 1, don't pick up to 0; S8 ~ S15 said KI/O0 - KI/O7 connected to the power

of resistance between state, pick up to 1, don't pick up to 0; Define a 16-bit user code is: C0,

C1,... C15. According to the different encoding, divided into two kinds of 001 and 002.

001 encoding

  C0 ~ C7 is decided by S0 ~ S7; C8 ~ C15 by C0 ~ C7 or get together with the S8 ~ S15.

Specific as follows: C0 = S0, C1 = S1, C2=S2，C3=S3，C4=S4，C5=S5，C6=S6，C7=S7；

  C8=S8⊙C0 ， C9=S9⊙C1 ， C10=S10⊙C2 ， C11=S11⊙C3 ， C12=S12⊙C4 ，

C13=S13⊙C5，C14=S14⊙C6，C15=S15⊙C7。

It can be arbitrary set 16 user code, a total of up to 216 = 65536.

  Note: (1) when there is only one KI/O connected with CCS,

can use wire instead of diode with or (2) you said;

002 encoding

Through KI/O0 - KI/O7 in a pin connected with CCS can determine C0 ~ C2. The following table

Connected to the CCS KI/On	C2	C1	C0
KI/O0(S0)	0	0	0
KI/O1(S1)	0	0	1
KI/O2(S2)	0	1	0
KI/O3(S3)	0	1	1
KI/O4(S4)	1	0	0
KI/O5(S5)	1	0	1
KI/O6(S6)	1	1	0
KI/O7(S7)	1	1	1

  Through the KI/O6, KI/O7 external connected to pull resistance can set the C7 ~ C3.
The following table

Pull-up resistors		Low 8 C7 ~ C3 in user code
KI/O6	KI/O7	C7	C6	C5	C4	C3
There is no	There is no	0	0	0	0	0
There is no	There are	1	0	0	1	1
There are	There is no	1	0	0	0	0
There are	There are	1	1	1	0	1

 High user code 8-bit C8 ~ C15 by C0 ~ C7 or get with the S8 ~ / S13: C8= C0⊙S8，

C9=C1⊙S9， C10=C2⊙S10 ， C11=C3⊙S11 ， C12=C4⊙S12 ， C13=C5⊙S13 ， C14=C6⊙0 ，C15=C7⊙0。

In this version of the circuit, not all user code can be set.

7. Continuous firing mode

  Either through a diode will REM and KI port is linked together,

can make all the buttons with functions of continuous firing way

(1); REM and a KI/O is linked together, can only make a button on the KIO port with continuous

emission function (2). In this kind of means of transmission, power consumption is bigger.

For example, REM by diode connected with KI/O0, KI/O0 # 1, # 2, # 3,

# 4, # # # # 33, 34, 35, 36 buttons will be continuous firing.

Note: (1) adopts continuous firing method, will make the double bond failure;

      (2) if the pressure drop of REM is too big,

can cause the signal cannot be accurately launch, so to control the output current on REM.