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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, hi-fi, etc. The transmitter is an LSI circuit realized in complementary MOS technology. * * * * * * Binary Coded, 9-Bit PCM Data Word Simple Modulator Requirements One-Pin Reference Oscillator for External Ceramic Resonator Very Low (Maximum 1 A) Standby Current Consumption Wide Operating Voltage Range: 4 to 10 V Operating Temperature Range: - 40 to 85 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 / 24
VSS
MODULATOR / 25 / 25
4
DATA
MUX
11 PAGE / 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
9-BIT 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
(c) Motorola, Inc. 1995 MOTOROLA
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 - 0.5 to + 12 Input Voltage, All Inputs - 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 C 10 Tstg - 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 high-impedance 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 -- -- -- -- -- A V V V A mA kHz 4 10 4 10 - 40C Min -- -- 5 25 2.8 7 -- -- Max 70 350 -- -- -- -- 1.2 3 Min -- -- 4 20 2.8 7 -- -- 25C Typ -- -- -- -- -- -- -- -- Max 50 250 -- -- -- -- 1.2 3 Min -- -- 3 15 2.8 7 -- -- 85C Max 40 200 -- -- -- -- 1.2 3 V V A Unit A
Characteristic Inputs R1...R8 and PAGE (with Pull-Up) 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 9-bit, 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.
BIT-n
`0' AM `1' f1*
f1*
* f1 is a train of pulses at the carrier frequency / 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 A. 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 pre-bit, a pre-bit pause, a start-bit, and nine data bits, where the pre-bit and the start- bit are always logical "1". The pre-bit 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 multi-key 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 multi-key condition is released and a single key is selected will the circuit resume operation, as previously described.
MOTOROLA
MC44107 3
SST g
COM
COM
COM
COM
SST
h
i COMMAND TIMING
S=1
A(0)
B(1)
C(1)
D(1)
E(0)
F(0)
G(1)
H(1)
I(1)
d f
d e e
d MESSAGE TIMING
a
b
c
d MODULATION OF BURST
MC44107 4
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CIRCUIT TIMING*
Modulation a = 4/fosc b = 16/fosc c = 4/fosc d = 256/fosc 8 s 32 s 8 s 512 s 1/f Carrier Half-Bit Time Message Timing d = 256/fosc e = 512/fosc f = 1536/fosc 512 s 1.02 ms 3.072 ms 32.8 ms 131 ms 131 ms 65.6 ms Half-Bit Time Bit Time Pre-Pulse Time Command Timing g = 32 x Bit Time h = 128 x Bit Time i = 128 x Bit Time tkey = 64 x Bit Time * Times indicated are typical and refer to an oscillator frequency of 500 kHz.
Figure 2. MC44107 Remote Control Transmitter Timing Diagram
MOTOROLA
PAGE
VDD
1000 F IR DIODES
PAGE KEYS CB DATA COLUMN DRIVER IC
OUTPUTS
CH
MATRIX KEYS
MC44107
R1
ROW
INPUTS
OSC
CERAMIC RESONATOR
R8
VSS
Figure 3. Transmitter Circuit
MOTOROLA
MC44107 5
PIN DESCRIPTIONS
ROW INPUTS 1 to 8 ( Pins 1, 2, 3, and 5 - 9) In the standby mode these inputs are held high by internal pull-up resistors. As soon as a key is pressed, a logical "0" is presented by the column output on that particular line. This switches the circuit to the active mode and starts the oscillator. COLUMN OUTPUTS B to H (Pins 12 - 16, 18, and 19) In the standby mode these pins are held low, logical "0". When a key is selected and the oscillator starts, the outputs are released and the scanning routine starts. PAGE INPUT (Pin 11) This input is connected directly to the transmitter's supervisory and control circuitry and may be connected to one of the column outputs, via a key, or left open. If the pin is left open, the first page of 64 commands will be available
(see Table 1). If connected to one of the column outputs, the remaining pages become available (see Table 2). The specified standby current consumption is maintained regardless of the load applied to the input: 0 V < V page < VDD. OSCILLATOR (Pin 17) A one-pin oscillator is incorporated into the circuit, which has been specifically designed for use with an inexpensive ceramic resonator between 430 kHz and 530 kHz. It is possible to use a tuned LC circuit with a series capacitor, in place of the ceramic resonator. DATA OUTPUT (Pin 4) This output provides the modulated signal for subsequent external amplification. SPECIAL NOTE: KEYBOARD It is important, when considering a keyboard, that the maximum "ON" resistance, even after aging, of 500 is strictly observed.
MC44107 6
MOTOROLA
Table 1. Transmitted Codes
Message Number 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Matrix Connect Row/Col 1A 1B 1C 1D 1E 1F 1G 1H 2A 2B 2C 2D 2E 2F 2G 2H 3A 3B 3C 3D 3E 3F 3G 3H 4A 4B 4C 4D 4E 4F 4G 4H Binary Code A 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 B 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 C 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 D 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 E 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 F 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 G 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 H 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 I 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Message Number 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 Matrix Connect Row/Col 5A 5B 5C 5D 5E 5F 5G 5H 6A 6B 6C 6D 6E 6F 6G 6H 7A 7B 7C 7D 7E 7F 7G 7H 8A 8B 8C 8D 8E 8F 8G 8H Binary Code A 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 B 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 C 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 D 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 E 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 F 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 G 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 H 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 I 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
MOTOROLA
MC44107 7
Table 2. Page Table
Message 0 to 63 64 to 127 128 to 191 192 to 255 256 to 319 320 to 383 384 to 447 448 to 511 Page Input Connected To Not Connected CB CC CD CE CF CG CH G 0 1 0 1 0 1 0 1 H 0 0 1 1 0 0 1 1 I 0 0 0 0 1 1 1 1
PACKAGE DIMENSIONS
P SUFFIX PLASTIC DIP CASE 738-03 -A20 11 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. DIM A B C D E F G J K L M N INCHES MIN MAX 1.010 1.070 0.240 0.260 0.150 0.180 0.015 0.022 0.050 BSC 0.050 0.070 0.100 BSC 0.008 0.015 0.110 0.140 0.300 BSC 15 0 0.020 0.040 MILLIMETERS MIN MAX 25.66 27.17 6.10 6.60 3.81 4.57 0.39 0.55 1.27 BSC 1.27 1.77 2.54 BSC 0.21 0.38 2.80 3.55 7.62 BSC 0 15 1.01 0.51
B
1 10
C
L
-TSEATING PLANE
K M E G F D 20 PL 0.25 (0.010)
M
N J 20 PL 0.25 (0.010) TA
M
M
T
B
M
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MC44107 8
*MC44107/D*
MC44107/D MOTOROLA

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