Texas Instruments TMS3637P Data Manual
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Texas Instruments TMS3637P Data Manual

Texas Instruments TMS3637P Data Manual

Remote control transmitter/receiver
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TMS3637
Remote Control Transmitter/Receiver
Data Manual
SCTS037B
JUNE 1997
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Summary of Contents for Texas Instruments TMS3637P

  • Page 1 TMS3637 Remote Control Transmitter/Receiver Data Manual SCTS037B JUNE 1997...
  • Page 2 IMPORTANT NOTICE Texas Instruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current.

  • Page 3: Table Of Contents

    Contents Title Page Introduction ............. . . 1–1 1.1 Features .
  • Page 4 5.7 Internal Amplifier/Comparator Test Mode ........5–5 5.8 Mode and Configuration Overview .
  • Page 5 List of Figures Figure Title Page 3–1 Normal Transmission – External Clock ........3–1 3–2 VTR Generation...
  • Page 6 List of Tables Table Title Page 5–1 Mode and Test Configuration ..........5–5 5–2 Transmitter Modes...

  • Page 7: Introduction

    1 Introduction The TMS3637 is a versatile 3-V to 6-V remote control transmitter/receiver in a small package that requires no external dual-in-line package (DIP) switches on the system circuit board. The device can be easily set for one of many transmit/receive configurations using configuration codes along with the desired security code, both of which are user programmable.

  • Page 8: Functional Block Diagram

    Functional Block Diagram Amplifier Logic Circuit OSCR Oscillator OSCC TIME Shift Power-On Register Reset Test Mode EEPROM High Voltage Memory Interface V CC Terminal Assignments D OR P PACKAGE (TOP VIEW) OSCR OSCC TIME 1–2...

  • Page 9: Terminal Functions

    Terminal Functions TERMINAL DESCRIPTION DESCRIPTION NAME Capacitor external. CEX is used for gain control of the internal analog amplifier. An external capacitor connected from CEX to GND determines the gain of the amplifier. If the internal amplifier is set for unity gain or the device is not used as a receiver, CEX is left unconnected. Ground Depending on the device configuration, IN provides inverted OUT data, is used as a receiver input, or is used to enter data during programming.
  • Page 10 Terminal Functions (Continued) TERMINAL DESCRIPTION DESCRIPTION NAME TIME Depending on the configuration, TIME is used for measuring the internal analog-amplifier output in the device test mode, putting the device into the transmit mode, or controlling an internal clock oscillator for various transmitter and receiver configurations. –...

  • Page 11: Specifications

    2 Specifications Absolute Maximum Ratings Over Operating Free-Air Temperature Range † (Unless Otherwise Noted) Supply voltage range, V (see Note 1) ......–...

  • Page 12: Electrical Characteristics Over Recommended Ranges Of Supply Voltage

    Electrical Characteristics Over Recommended Ranges of Supply Voltage and Operating Free-Air Temperature (unless otherwise noted) 2.3.1 Signal Interface PARAMETER TEST CONDITIONS UNIT Low-level output voltage, OUT I OL < 5 mA V OL V OL Low-level output voltage, OSCC High-level output voltage, OUT I OH <...

  • Page 13: Timing Requirements Over Recommended Ranges Of Supply Voltages And Free-Air Temperature

    Timing Requirements Over Recommended Ranges of Supply Voltages and Free-Air Temperature 2.4.1 Abort/Retry Time between consecutive codes 46 x t w (transmitter) Time out for high-level bit to abort the code 3 x t w (receiver) Time out for low-level bit to abort the code 25 x t w (receiver) Time between aborted code and reading of new code 3 x t w (receiver)
  • Page 14 2–4...

  • Page 15: Parameter Measurement Information

    3 Parameter Measurement Information V IH OSCC V IL t p0 t p1 t w2 t w1 V IH V IL Figure 3–1. Normal Transmission – External Clock OSCC t su1 t w3 Figure 3–2. VTR Generation V CC t su2 5.5 V OSCC 4 Reset Pulses...
  • Page 16 V CC C01– C22 CA– CI t su3 4 Reset Pulses 22 Security Bits 9 Configuration Bits OSCR (clock in) t w6 t w7 (data in) 15 V 5.5 V OSCC High-Voltage Programming Pulse (previous data) Figure 3–4. EEPROM Write Mode OSCR (clock) (data in)

  • Page 17: Typical Characteristics

    4 Typical Characteristics 220 kΩ 22 kΩ R osc – Oscillator Resistance – kΩ Figure 4–1. Oscillator Resistance Versus Supply Voltage 10 7 R osc = 100 kΩ 10 6 R osc = 47 kΩ R osc = 22 kΩ 10 5 10 4 10 3...
  • Page 18 15 V 5.5 V > 1 ms > 3 ms t – Time – ms Figure 4–3. High-Voltage Programming Pulse 4–2...

  • Page 19: Principles Of Operation

    5 Principles of Operation Power-On Reset The power-on reset function starts when V rises above 2.7 V and is completed after four clock periods. After power-on reset, the nine configuration bits contained in the EEPROM memory are loaded into the logic circuits, which determine the device mode and configuration of operation.

  • Page 20: Program Write Mode

    V CC C01 – C22 CA – C1 t su2 4 Reset Pulses 22 Security Bits 9 Configuration Bits OSCR (clock in) t w4 t w5 5.5 V OSCC Figure 5–1. EEPROM Read Mode 5.2.2 Program Write Mode The procedure to write the 31 security code and configuration bits to memory is described below (see Section 3 for timing diagram): Set V to 5 V.

  • Page 21: Internal Oscillator Operation For Transmit And Receive Modes Setting Frequency

    = 10 µs, apply the high-voltage programming pulse to After a minimum valid time of t permanently store the 31 code bits in EEPROM memory as shown in Figure 5–2. As stated in steps 4 and 5, exactly 4 reset and 31 clock pulses must be applied for the device to successfully program.

  • Page 22: Internal Oscillator Operation For Transmit And Receive Modes Sampling Frequency

    Internal Oscillator Operation for Transmit and Receive Modes Sampling Frequency The internal oscillator of the transmitter or receiver can be externally sampled at OSCC and OSCR. The waveform at OSCC is triangular and the waveform at OSCR is square. The amplitude of these waveforms depends on the capacitor and resistor values used.

  • Page 23: Internal Amplifier/Comparator Test Mode

    Amplifier Comparator (Ao) (Ai) – 178 Ω 35.5 kΩ (internal) (internal) 200-mV Reference (internal) 0.15 nF (internal) Figure 5–3. Amplifier/Comparator Schematic Internal Amplifier/Comparator Test Mode Normally, the output of the amplifier/comparator section is fed directly to the logic circuitry internal to the device;...
  • Page 24 Table 5–2. Transmitter Modes C1–C22 CA–CI NO. OF OSCR OSCC TIME CONFIG. ABCDEFG ABCDEFG MODES (PIN 1) (PIN 2) (PIN 3) (PIN 5) (PIN 6) (PIN 7) HI † Normal 11100000X Continuous Normal 110DE0001 Triggered Normal 110DE0000 Periodic Modulated 100DE0001 Triggered Capacitor to Modulated...
  • Page 25 Table 5–3. Receiver Modes C1–C22 CA–CI NO. OF OSCR OSCC TIME CONFIG. ABCDEF ABCDEFG MODES † (PIN 1) (PIN 2) (PIN 3) (PIN 5) (PIN 6) (PIN 7) HI ‡ Analog Requires a Normal high-to- 010XX010I enable receiver or Analog a resistor Normal 010DE011I...

  • Page 26: Transmitter Configurations

    Transmitter Configurations Of the total 31 data bits that are stored by the TMS3637, the last nine (CA through CI) configure the device in one of 18 possible transmitter configurations. The device can run continuous, triggered, or periodic in transmission. In addition, each of these functions can have a single, pulse, or train output in both normal and modulated configurations.

  • Page 27: Normal Mode (Cb = 1)

    5.10.1 Normal Mode (CB = 1) When the chip is configured as a continuous transmitter (CA = 1, CF = CG = CH = 0, and CC = 1), as a triggered transmitter (CA = 1, CF = CG = CH = 0, and CC = 0, CI = 1), or as a periodic transmitter (CA = 1, CF = CG = CH = 0, and CC = 0, CI = 0), and EEPROM bit CB is set to 1, the TMS3637 operates as a normal transmitter and emits the stored code on OUT (the open drain requires a pullup resistor).

  • Page 28: Receiver Configurations

    Table 5–5. Code-Train Modes TRAIN 2 codes 4 codes 8 codes TRAIN CODES Transmitter NO. OF CODES CA = 1, CF = CG = CH = 0 Triggered Continuous Periodic CC = 1 CC = 0, CI = 1 CC = 0, CI = 0 1 Code 2 Codes 4 Codes...

  • Page 29: Valid Transmission Receiver (Cg = 1, Ch = 0)

    † Table 5–6. Transmitter/Receiver Compatibility RCVR ANALOG ANALOG ANALOG LOGIC LOGIC LOGIC MODULATED MODULATED MODULATED NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL TRAIN Q-STATE TRAIN Q-STATE TRAIN Q-STATE XMITTER Normal Continuous Normal Triggered Normal Periodic Modulated Continuous Modulated Triggered Modulated Periodic Code Train Normal Triggered...

  • Page 30: Q-State Receiver (Cg = 0, Ch = 0, Cd, Ce)

    further increases the security of the device by not recognizing the correct received code until it is repeated two, four, or eight times within a period of time specified by an external RC combination described in the following paragraphs. When the TMS3637 is configured as a train receiver, connect an external resistor and capacitor in parallel between TIME and V , which sets the length of time the device searches for two, four, or eight correct received codes.

  • Page 31: Normal Mode (Cb = 1)

    TRAIN CODES Receiver NO. OF CA = 0, CC = 0 CODES Q-State Receiver VTR Receiver Train Receiver CG = 0, CH = 0 CG = 1, CH = 0 CG = 1, CH = 1 2 Codes 4 Codes 8 Codes 1 Code 2 Codes...

  • Page 32: Logic Mode (Cf = 1)

    5.12.4 Logic Mode (CF = 1) In this configuration, the received code is at logic level. The analog amplifier and comparator connected internally to IN is bypassed. This is typically the configuration used when the transmitter and receiver are connected together by a hard line. 5.12.5 Noninverting Mode (CI = 0) or Inverting Mode (CI = 1) The code input to IN is not inverted before passing to the logic circuitry.

  • Page 33: General Applications

    6 Application Information General Applications In this section an example schematic is shown for each of the four transmission media categories for which the device can be configured. These schematics help to define the capabilities of the TMS3637. When configured for infrared, one transmitter works for both normal and modulated modes. In addition, a recommended programming station is shown.
  • Page 34 The input to the internal comparator has a voltage swing of approximately 1.4 V peak-to-peak (13 108 mV). OUT on the receiver maintains the same status for approximately 0.5 s (1M 470 nF). Table 6–1. Two-Wire Direct Connection DEVICE FUNCTION TMS3637 configured as a normal continuous logic transmitter TMS3637 configured as a analog normal Q-state noninverting receiver Pullup resistor on OUT, an open drain...

  • Page 35: Four-Wire Direct Connection

    V CC V CC and Code 220 Ω 47 µF 10 kΩ 220 Ω 100 kΩ 10 nF V CC V CC 1 MΩ U1 (transmitter) U2 (receiver) 22 kΩ 0.1 nF OSCR OSCC TIME OSCR OSCC TIME 470 nF 22 kΩ...
  • Page 36 Table 6–2. Four-Wire Direct Connection DEVICE FUNCTION TMS3637 configured as a normal continuous logic transmitter TMS3637 configured as an analog normal (1-code) Q-state noninverting receiver Inverter (NOT gate) used as external clock Feedback resistor for U3 Resistor on TIME that, in conjunction with C2, determines OUT pulse duration on U2. Resistor on OSCR that, in conjunction with C3, determines internal oscillator frequency of U2.

  • Page 37: Infrared Coupling Of Transmitter/Receiver - Normal Transmission Mode

    V CC CODE V CC CEX OUT U1 (transmitter) OSCR OSCC TIME Figure 6–3. Four-Wire Direct Connection Key Infrared Coupling of Transmitter/Receiver — Normal Transmission Mode Table 6-3 lists the parts for the schematic of an infrared transmitter working in the normal transmission configuration as shown in Figure 6–4.
  • Page 38 Table 6–3. Infrared Transmitter Component Functions (Normal Transmission Mode) DEVICE FUNCTION TMS3637 configured as a normal continuous transmitter Resistor on OSCR that, in conjunction with C1, determines the internal oscillator frequency of U1. Current-limiting resistor for LED Current-limiting base-drive resistor for Q1 Pullup resistor for OUT on U1 and bias for Q1 Current-limiting collector resistor for Q1 Pullup resistor for TIME...
  • Page 39 Table 6–4. Infrared Receiver Component Functions (Normal Transmission Mode) DEVICE FUNCTION TMS3637 configured as a logic normal (1-code) Q-state inverting receiver Current-limiting resistor for IR transistor Q1 Base-bias resistor for Q1 Collector current-limiting resistor for Q2 Collector current-limiting resistor for Q3 Emitter current-limiter for Q3 Resistor on TIME that, in conjunction with C3, determines OUT pulse duration on U1.

  • Page 40: Infrared Coupling Of Transmitter/Receiver- Modulated Transmission Mode

    Infrared Coupling of Transmitter/Receiver— Modulated Transmission Mode Table 6–5 lists the parts for the schematic of an infrared receiver working in the modulated continuous configuration shown in Figure 6–6. This modulated receiver can be used with a normal infrared transmitter (see Figure 6–4) provided that the following guide lines are observed.
  • Page 41 Table 6–5. Infrared Receiver Component Functions (Modulated Transmission Mode) DEVICE FUNCTION Demodulator TDA3048 (or equivalent) TMS3637 configured as a normal logic (1-code) Q-state inverting receiver Current-limiting resistor for U1 Resistor on TIME that, in conjunction with C2, determines OUT pulse duration on U2. Resistor on OSCR that, in conjunction with C3, determines the internal oscillator frequency of U2.

  • Page 42: Radio Frequency (Rf) Coupling Of Transmitter And Receiver

    Radio Frequency (RF) Coupling of Transmitter and Receiver Table 6–6 lists the parts for the schematic of a radio frequency transmitter and receiver shown in Figure 6–7. In Figure 6–7, the transmitter is configured as a normal continuous transmitter and the content of the configuration of the EEPROM cells is: The oscillating frequency of the transmitter is about 5.7 kHz, and the transmitter code is pulse modulated.
  • Page 43 IN is used for the data out. IN provides the complement of the data out in the transmitter configuration. In Figure 6–8, the receiver is configured as an analog normal noninverting VTR receiver, and the content of the EEPROM cells is: The receiver is used in the noninverting mode.
  • Page 44 RF Input DOUT TRIG V CC BBOUT 47 nF 100 nF V CC CEX OUT U2 Decoder TMS3637 1 MΩ U1 RF Receiver Filter OSCR OSCC TIME GND TRF1400 470 nF 22 kΩ 1 nF DV CC AV CC Figure 6–8. TRF1400 RF Receiver and TMS3637 Decoder Circuit...

  • Page 45: Rf Receiver And Decoder

    RF Receiver and Decoder Table 6–7 lists the parts for the schematic shown in Figure 6–8. Figure 6–8 shows a Texas Instruments TRF1400 RF receiver and a Texas Instruments TMS3637 receiver connected as an RF receiver and decoder combination. Table 6–7 lists the components that comprise this circuit. As with any RF design, the successful integration of these two devices relies heavily on the board layout and the quality of the external components.

  • Page 46: Programming Station

    Resistor 1 KΩ Resistor 27 kΩ 1M Ω Resistor RF Receiver Texas Instruments TRF1400 Decoder Texas Instruments TMS3637 Programming Station A programming station schematic is shown in Figure 6–9. This station is made up of two major parts: 1)a shift register/clock circuit that outputs exactly 35 bits serially (four reset pulses, 22 security bits, and 9 configuration bits), and 2) a transistor ramp generator that outputs the programming pulse required to store data in the EEPROM.
  • Page 47 closed for the duration of the entire clocking sequence which is 4.4 ms or greater (125 µs 35 bits = 4.4 ms). At the conclusion of the count, the one-shot timer U5 is edge triggered by the output of the counter-comparator U7.
  • Page 48 (A9), (B9) 74LS279 U4 B U3 A 74HC74 (B7) 8 kHz 74LS04 Ω 74HC21 1 µF (B8) U4 A SPST Momentary Push to Program (A1) SN74ALS04 74LS123 (B1) (A6) C EXT 0.47 µF Ω R EXT / 10 k TLC555I C EXT Ω...
  • Page 49 U6 B 74HC682 74HC393 P = Q P > Q U6 A 74HC393 Ω R21, 10 k Ω R20, 10 k 17 V Ω R19, 10 k J1 IN: Prog J1 OUT: Read Ω 9.1 k Ω 8.2 k IN414B Ω...

  • Page 50: Tms3637 Programming Station Parts Lists

    TMS3637 Programming Station Parts Lists Table 6–8 contains a listing of the parts that compose the TMS3637 programming stations (see Figure 6–9 for a schematic). Table 6–8. TMS3637 Programming Station Parts List PART DESCRIPTION FUNCTION Resistor, 1 kΩ,, 1/4 watt R1 is an isolation resistor Resistor, 1 kΩ,, 1/4 watt With C1 and R4, R2 sets U8 discharge time...

  • Page 51: Tms3637 Edge-Connector Pinout

    TI recommends a ZIF socket to be used at location U14 for ease of programming the TMS3637. For TMS3637P (DIP) packages, a 16-pin ZIF can be used (lower portion unused). For TMS3637N surface-mount packages, use a clamshell with a latch cover and DIP footprint. This can be purchased from EmMulation Technology (408-982-0660) part # AS-0808-015-3.
  • Page 52 6–20...
  • Page 53 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability.

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