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Part: MC44107P
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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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CMOS
MC44107
P SUFFIX PLASTIC DIP CASE 738
1
IR Remote Control Transmitter
The MC44107 remote control transmitter converts a keyboard input into a pulse code modulated signal suitable for infrared transmission to an appropriate receiver. Its large command capacity, 512 commands, makes it highly suited to remote control applications in TV, video, hiญfi, etc. The transmitter is an LSI circuit realized in complementary MOS technology. ท ท ท ท ท ท Binary Coded, 9ญBit PCM Data Word Simple Modulator Requirements OneญPin Reference Oscillator for External Ceramic Resonator Very Low (Maximum 1 ตA) Standby Current Consumption Wide Operating Voltage Range: 4 to 10 V Operating Temperature Range: ญ 40 to 85ฐ C
20
ORDERING INFORMATION
MC44107P Plastic DIP
PIN ASSIGNMENT
R5 R2 R7 Dout R1 R6 R8 R4 R3 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 MUX CD CF OSC CG CC CB CE CH PAGE
BLOCK DIAGRAM
VDD OSC 17 OSC 20 ๗ 24
VSS
MODULATOR ๗ 25 ๗ 25
4
DATA
MUX
11 PAGE ๗ 22 R1 R2 R3 R4 R5 R6 R7 R8 5 2 9 8 1 6 3 7 TEST 10 VSS ROW ENCODER SUPERVISE AND CONTROL
9ญBIT SHIFT REG.
14 15 SCANNER COLUMN DECODER 19 13 18 16 12
CB CC CD CE CF CG CH
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice. REV 2 8/95
ฉ OTOROLA M Motorola, Inc. 1995
MC44107 1
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MAXIMUM RATINGS* (Voltages referenced to VSS)
Parameter Symbol VDD Vin I I DC Supply Voltage Value Unit V V ญ 0.5 to + 12 Input Voltage, All Inputs ญ 0.5 to VDD + 0.5 2 DC Current Drain per Pin (Except Signal Out and VDD) DC Current Drain (Signal Out and VDD) Storage Temperature Range mA mA ฐC 10 Tstg ญ 65 to + 150 * Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the limits in the Electrical Characteristics tables or Pin Descriptions section.
This device contains protection circuitry to guard against damage due to high static voltages or electric fields; however, it is advised that precautions be taken to avoid application of voltage higher than maximum rated voltages to this highญimpedance circuit. For proper operation it is recommended that Vin and Vout be constrained to the range VSS (Vin or Vout) VDD. Unused inputs must always be tied to an appropriate logic voltage level (e.g., either VSS or VDD).
ELECTRICAL CHARACTERISTICS
VDD Vdc 4 10 4 10 VIH VIL Ion 4 10 Ioff VOH VOL VDD IDDSTB IDDACT fosc 4 10 4 10 4 10 -- 4 10 4 10 -- 270 1350 -- -- 3.2 9.6 -- -- 4 -- -- -- -- -- -- -- 1 1 -- -- 0.8 0.4 10 -- -- -- -- -- 200 1000 -- -- 3.0 9.5 -- -- 4 -- -- -- -- 430 -- -- 1 1 -- -- -- -- -- 0.02 0.02 0.07 0.45 -- -- -- -- -- 1 0.5 1 0.5 10 1 1 1 2 530 160 800 -- -- 2.8 9.4 -- -- 4 -- -- -- -- -- -- -- 1 1 -- -- 1.2 0.6 10 -- -- -- -- -- ตA V V V ตA mA kHz 4 10 4 10 ญ 40ฐC Min -- -- 5 25 2.8 7 -- -- Max 70 350 -- -- -- -- 1.2 3 Min -- -- 4 20 2.8 7 -- -- 25ฐC Typ -- -- -- -- -- -- -- -- Max 50 250 -- -- -- -- 1.2 3 Min -- -- 3 15 2.8 7 -- -- 85ฐC Max 40 200 -- -- -- -- 1.2 3 V V ตA Unit ตA
Characteristic Inputs R1...R8 and PAGE (with PullญUp) Iin at Vin = 1.2 V Iin at Vin = 3 V Iin at Vin = 2.8 V Iin at Vin = 7 V VIH VIH VIL VIL Outputs CB...CH (Open Drain) Ion at Von = 1.2 V Ion at Von = 3 V Ioff Ioff Output DATA VOH at Isource = 1.0 mA VOL at Isink = 1.0 mA Supply Voltage Standby Current Active Mode Current Oscillator Frequency
Symbol Iin
MC44107 2
MOTOROLA
CIRCUIT OPERATION
The transmitter emits a 9ญbit, labelled A (LSB) to I (MSB), binary code able to encode 512 commands organized as 8 pages of 64 commands. All of these commands are user selectable except the last command (511) which is used as an SST, Start/Stop Transmission code. Each bit of the transmitted signal is in the form of a biphase pulse code modulated (PCM) signal, whose coding is shown in Figure 1.
BITญn
`0' AM `1' f1*
f1*
* f1 is a train of pulses at the carrier frequency ๗ 16.
Figure 1. Signal Coding The keyboard can be a simple switch matrix, connected between the eight row inputs (1 to 8) and the seven column outputs (B to H). VSS acts as the eight column line to give the full complement of 64 commands per page. The maximum "ON" resistance of the keyboard must be limited to 500 . Page access is accomplished by connecting, by means of a key, the page input to one of the seven column outputs or by leaving the input circuit open. One of the circuit's major features is its low standby current consumption -- typically less than 1 ตA. For this reason the battery may be left continuously in circuit. As soon as a key is selected, the circuit switches to its active mode and enables the oscillator. To allow for accidental activation and/or key bounce, the circuit requires that the key is held for a minimum delay of tkey, which in the case of a 500 kHz oscillator is 65.6 ms. After this delay the column/ row/page command, consisting of a string of messages (see
Figure 2), appropriate to the key selected will be transmitted and repeated until the key is released. Any page key required must be selected before, and held during, the selection of the column/row matrix key. If this sequence is not followed, the circuit will default to the appropriate command between 0 and 63. If two or more page keys are accidentally held down, only the first one pressed will be detected. A command consists of several messages. Each command starts with the message 511 (SST) followed by the message appropriate to the key selected. These messages are repeated until the key is released. The final message is always followed by the SST message, 511. Every message consists of a preญbit, a preญbit pause, a startญbit, and nine data bits, where the preญbit and the startญ bit are always logical "1". The preญbit allows for the set up of the AGC loop in the receiving preamplifier. The truth tables for data bits are given in Tables 1 and 2, while Figure 2 shows the timing relationships between the commands, messages, and modulation. In the event of accidental multiญkey operation, the circuit will react in one of three ways, depending on the combination of the keys selected. When two or more keys are connected to the same row input and any column output except A, the command appropriate to the first key selected will be transmitted until that key is released. After the SST code has been transmitted, assuming another key is still selected, the command appropriate to that key will be transmitted. If the other key has been released in the meantime, the circuit will revert to standby. If two keys are selected in the same row with one being connected to column A, any transmission will terminate with the SST code and then the circuit will transmit the command appropriate to the key connected to column A. In the case where two or more keys connected to the same column are selected, the circuit reacts in a normal manner to the first key activated. Upon selection of the second key, the SST code is transmitted and the circuit will revert to the standby mode. Only when the multiญkey condition is released and a single key is selected will the circuit resume operation, as previously described.
MOTOROLA
MC44107 3
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