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M709 - M709A M710 - M710A

PCM REMOTE CONTROL TRANSMITTERS

M709 - M709A M710 - M710A
PCM REMOTE CONTROL TRANSMITTERS
The reference oscillator is controlled by a cheap ceramic or LC resonator. Two types of transmission mode are available : "Flash" or "Carrier" mode. The M709 is a simplified version of the M710 which can only transmit 40 commands with 16 possible addresses. The M710 on the other hand has the full system capacity : it can transmit 64 commands with 16 addresses. The M709 and M710 are produced with CMOS Si-gate technology and are available in 24 and 28-pin dual in-line plastic packages respectively.
DIP24 (Plastic Package) ORDER CODE : M709B1 / M709AB1
March 1995
DIP28 (Plastic Package) ORDER CODE : M710B1 / M710AB1
M709 - M709A - M710 - M710A
PIN CONNECTIONS
DIP24 - M709 / M709A
TRANSMISSION MODE OSC. IN OSC. OUT E D C B A K I L M 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 V DD OUTPUT V SS X Y ADDRESS W Z TEST Q P O
DIP28 - M710 / M710A
TRANSMISS ION MODE OSC. IN OSC. OUT H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 28 27 26 25 24 23 22 21 20 19 18 VDD OUTPUT VSS X Y ADDRESS W Z TEST Q P O
709-01.EPS / 709-02.EPS 709-03.EPS / 709-04.EPS
Note : The test pin must be connected to VSS.
FUNCTIONAL DESCRIPTION
V DD 24 X 21 Y 20 ADDRESS
OSC. IN 2
OSC. OUT 3
TEST 17
M709 M709A
23 OUTPUT
TRANSMISSIONMODE 1
OSC. IN 2
OSC. OUT 3
TEST 21
M710 M710A
27 OUTPUT
M709 - M709A - M710 - M710A
BLOCK DIAGRAM
ROW INPUTS COLUMN INPUTS
ENABLE KEYBOA RD LOGIC OSCILLATOR
OSC. IN OSC. OUT
ADDRESS
TRANSMISSION CODE LATCH
DVIDE RS AND CLOCK GENERATOR
OUTPUT
TRANSMIS SION SEQUENCE LOGIC
END OF TRANSMISSION LOGIC
709-03.EPS
TRANSMISSIO NMODE
ABSOLUTE MAXIMUM RATINGS
709-01.TBL 709-02.TBL
Stresses above those listed under "Absolute 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 conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
M709 - M709A - M710 - M710A
709-03.TBL 709-04.TBL
IOH IOL VTH VTL IIL IIH IIH IL IOS
High State IR Output Current Low State IR Output Current Input Threshold High Input Threshold Low Input Low Current Input High Current Input High Current Input Leakage Current Output Current
TRUTH TABLE
M709 - M709A - M710 - M710A
TRUTH TABLE (continued)
DESCRIPTION The signals are transmitted with infrared light using pulse code modulation. Each word consists of 12 bits. The binary information of a bit is determined by the time interval between two pulses. If "T" is the time base, the bits are coded as follows :
T "0" 2T "1"
3T "1"
709-06.EPS / 709-07.EPS
The different code introduced for the even and odd "1s" improves the capability to recognize false codes at the receiver end. For example the double error which can cause the exchange "10" with "01" is easily detected. A parity bit is also added in order to further increase the reliability of the transmission. This bits is "1" if the number of transmitted "1s" is even while it is "0" if the number of transmitted "1s" is odd. In addition, every word contains a preliminary pulse, a start pulse and a stop pulse. The spacing between the preliminary and the start pulse is 4T. This is followed after 1T by 11 data pulses (one parity bit), and terminated after 4T interval by a stop pulse. Consequently, a word in which the binary digit 0 occurs ten times has a total duration of 21T. A word containing ten "1s" has a duration of 36T.
709-05.TBL
M709 - M709A - M710 - M710A
Example :
4T T T 0 3T 1 2T 1 3T 1 T 0 3T 1 T T 0 0 2T 1 T T 0 t Prelim. Pulse Start Pulse Parity Bit Stop Pulse
709-08.EPS 709-10.EPS 709-09.EPS
Address Bits
Command Bits
SYNCHRONIZATION BETWEEN TRANSMITTER AND RECEIVER The transmitter and the receiver can operate with different reference frequencies. Typical values suitable for correct operation of the system should be between 445 and 510kHz, using a cheap ceramic resonator. Synchronization between the transmitter and the receiver, necessary to obtain the wide range of frequency tolerance described above is achieved by measuring in the receiver the interval between the start pulse and the first data pulse, storing this value and using it as time base T. KEYBOARD (pins A to Q) / CODE REPETITION One column input (K to Q) has to be connected to one row (A to H) input to activate the transmitter.
COMMAND TRANSMISSION KEY CLOSED FLASH MODE CARRIER MODE
END OF TRANSMISSION CODE
COMMAND TRANSMISSION KEY RELEASED
ANTIBOUNCE (25ms)
REPETITION TIME (102ms)
M709 - M709A - M710 - M710A
709-11.EPS
ADDRESS (pins X, Y, W, Z) The Address information is coded and transmitted as follows :
ADDRESS BITS PRELIMINARY PULSE AND START PULSE t COMMANDS BITS PARITY BIT STOP PULSE
709-12.EPS
The address inputs have internal pull-downs which are disabled during stand-by. Single Address Selection
709-13.EPS
Multiple Address Selection
ADDRESS 13 X Y W Z
ADDRESS 11
Note : unused inputs can be left open or connected to VSS.
709-14.EPS
ADDRESS 13
709-06.TBL
M709 - M709A - M710 - M710A
TYPICAL APPLICATION FLASH MODE
ADDRESS T MODE 2 x LD271
OUT 820 BC377 V SS 2x 1N4148 BD237 220µF
KEYBOARD
455 to 510kHz
100pF
709-15.EPS
CARRIER MODE
ADDRESS 2 x LD271
OUT 1k BC377 T MODE
KEYBOARD
BD237
220µF
V SS TEST 2x 1N4148
455 to 510kHz
100pF
709-16.EPS
M709 - M709A - M710 - M710A
PACKAGE MECHANICAL DATA 24 PINS - PLASTIC DIP
Dimensions a1 b b1 b2 D E e e3 F i L
Millimeters Typ. 0.63 0.45 1.27
Inches Typ. 0.025 0.018 0.050
DIP24.TBL
PM-DIP24.EPS
M709 - M709A - M710 - M710A
PACKAGE MECHANICAL DATA 28 PINS - PLASTIC DIP
Dimensions a1 b b1 b2 D E e e3 F i L
Millimeters Typ. 0.63 0.45 1.27
Inches Typ. 0.025 0.018 0.050
DIP28.TBL
PM-DIP28.EPS