Four-pin TTL optical module

Abstract

The utility model relates to a four-pin TTL optical module, which comprises a PCB, a data receiving circuit and a data transmitting circuit, the data receiving circuit and the data transmitting circuit are integrated on the PCB, the PCB is provided with four pins, the four pins are a pin1 VCC, a pin2 RD, a pin3 TD and a pin4 GND in sequence, the data receiving circuit is electrically connected with the pin2 RD, and the data transmitting circuit is electrically connected with the pin3 TD. The four-pin TTL optical module is only provided with four pins, namely the pin 1 VCC, the pin 2 RD, the pin 3 TD and the pin 4 GND, so that the function of the existing 9-pin TTL optical module is realized, the number of the pins is reduced to four while normal use of the optical module is not influenced, the width of the pin end of the optical module is reduced, and the optical module adapts to a special scene and a narrow space of special equipment; besides, the PCB of the optical module is directly placed on the communication equipment without a shell, so that the size of the optical module is further reduced, the production cost is reduced, and the reliability and the stability of the optical module are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical communication technical field, concretely relates to a 4 pin TTL optical module. BACKGROUND

[0002] The existing 9 pin TTL optical module is externally connected with 9 pins, as shown in the drawings, pin1 GNDR (receiver ground pin), pin2 RD+ (receiver data output), pin3 RD- (empty pin not connected), pin4 SD (receiver no light alarm), pin5 VccR (receiver positive power supply), pin6 VccT (transmitter positive power supply), pin7 TD- (empty pin not connected), pin8 TD+ (transmitter data input), pin9 GNDT (transmitter ground pin) are sequentially arranged, and the pin end width of the module is relatively large due to the excessive number of pins. Figure 2 And Figure 4 In some special application scenarios, due to space limitations, the optical transceiver module with large pin end width is often difficult to install or integrate.

[0003] In addition, the design of excessive pins also increases the complexity of manufacturing and assembly, and improves the production cost.

[0004] Therefore, in view of the above problems, it is necessary to develop an optical transceiver integrated module with smaller size and fewer pins to meet the needs of special small space installation. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem that a 4 pin TTL optical module is provided to overcome the above-mentioned deficiencies in the prior art.

[0006] The technical scheme for solving the above technical problem is as follows: a 4 pin TTL optical module, comprising a PCB board, and a data receiving circuit and a data sending circuit integrated on the PCB board, four pins are arranged on the PCB board, and the four pins are pin1 VCC, pin2 RD, pin3 TD and pin4 GND in sequence, the data receiving circuit is electrically connected with pin2 RD, and the data sending circuit is electrically connected with pin3 TD.

[0007] The utility model discloses beneficial effect is: as TTL signal is single signal, not differential signal, therefore existing 9 needle TTL optical module pin3 RD - pin and pin7 TD - foot are empty foot, can delete, in addition, the PCB board of this 4 needle optical module is placed in communication equipment directly, need not no light warning, can delete existing 9 needle optical module pin4 SD foot, data receiving circuit and data sending circuit share a power pin and a ground pin, therefore, the 4 needle TTL optical module of the application only sets up 4 foot pin1 VCC, pin2 RD, pin3 TD, pin4 GND, namely realizes the function of existing 9 needle TTL optical module, reduces to 4 at the same time without influencing the normal use of optical module, reduces the pin end width of optical module, adapts the narrow space of special scene, special equipment, in addition, the PCB board of the optical module of the application is placed in communication equipment directly, has no shell, further reduces the volume of optical module, reduces production cost, improves the reliability and stability of optical module.

[0008] On the basis of the above technical scheme, the utility model still can make following improvement.

[0009] Further, the data receiving circuit comprises U4A, JP2, C5, C6, R14, R15, R16, R17, R18, R19;

[0010] Pin 1 of U4A is electrically connected with pin2 RD, pin 8 of U4A is electrically connected with pin1 VCC, pin 4 of U4A is electrically connected with pin4 GND, pin 2 of U4A is electrically connected with one end of R17 and one end of R18, the other end of R18 is electrically connected with pin1 VCC, the other end of R17 is electrically connected with one end of R15 and R16, pin 3 of U4A is electrically connected with one end of R14, the other end of R16 is connected with pin4 GND, the other end of R15 is connected with the other end of R14 and pin of JP2, pin 1 of JP2 is connected with one end of R19 and C6, the other end of C6 is electrically connected with pin4 GND, the other end of R19 is electrically connected with one end of C5 and pin1 VCC, the other end of C5 is electrically connected with pin4 GND, pin 4 of JP2 is electrically connected with pin4 GND.

[0011] Further, the data sending circuit comprises JP1, U1, U2, U3, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, C1;

[0012] Pin 2 of U1 and pin 2 of U2 are electrically connected with pin 3 TD, pin 3 of U1 and pin 3 of U2 are electrically connected with pin 4 GND, pin 5 of U1 and pin 5 of U2 are electrically connected with pin 1 VCC, pin 4 of U1 is electrically connected with one end of R1, pin 4 of U2 is electrically connected with one end of R2, the other end of R2, the other end of R1 and one end of R3 are electrically connected with pin 4 of JP1, pin 1 of JP1 is connected with one end of R8, one end of R9 and pin 1 VCC, pin 2 of JP1 is electrically connected with pin 4 GND, the other end of R9 is electrically connected with one end of R10 and one end of R6, the other end of R10 is electrically connected with pin 4 GND, the other end of R6 is electrically connected with pin 1 of U3, pin 2 of U3 is electrically connected with pin 4 GND, pin 5 of U3 is electrically connected with pin 1 VCC, pin 4 of U3 is electrically connected with the other end of R3 and one end of R7, the other end of R7 is electrically connected with pin 3 of U3, one end of R5 and one end of R4, the other end of R4 is electrically connected with pin 4 GND, the other end of R5 is electrically connected with one end of C1, one end of R11, the other end of R8 and pin 3 of JP1, the other end of R11 is electrically connected with the other end of C1 and pin 4 GND.

[0013] Further, the data sending circuit further comprises C2, C3 and C4, one end of C2, one end of C3 and one end of C4 are connected to pin 1 VCC and pin 1 of JP1, the other end of C2, the other end of C3 and the other end of C4 are electrically connected with pin 4 GND.

[0014] Further, the data sending circuit further comprises C2, C3 and C4, one end of C2, one end of C3 and one end of C4 are connected to pin 1 VCC and pin 1 of JP1, the other end of C2, the other end of C3 and the other end of C4 are electrically connected with pin 4 GND.

[0015] Further, the width of the pin end of the PCB is 13mm. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a 4-pin optical module circuit diagram of the utility model;

[0017] Figure 2 It is a 9-pin optical module circuit diagram in the prior art;

[0018] Figure 3 It is a 4-pin optical module PCB structure schematic view of the utility model;

[0019] Figure 4 It is a 9-pin optical module PCB structure schematic view in the prior art. DETAILED DESCRIPTION

[0020] The principles and characteristics of the present application are described below in conjunction with the accompanying drawings, and the examples are used to explain the present application and are not intended to limit the scope of the present application.

[0021] As shown in Figures 1-4 Embodiment 1, a 4-pin TTL optical module, comprising a PCB board, and a data receiving circuit and a data sending circuit integrated on the PCB board, the PCB board is provided with four pins, the four pins are pin1 VCC, pin2 RD, pin3 TD and pin4 GND in sequence, the data receiving circuit is electrically connected with pin2 RD, and the data sending circuit is electrically connected with pin3 TD.

[0022] Since the TTL signal is a single signal, not a differential signal, the existing 9-pin TTL optical module pin3 RD-pin and pin7 TD-pin are empty pins, which can be deleted, in addition, the PCB board of the 4-pin optical module is directly placed in the communication equipment, without optical alarm, the existing 9-pin optical module pin4 SD pin can be deleted, the data receiving circuit and the data sending circuit share one power pin and one ground pin, therefore, the 4-pin TTL optical module of the present application is provided with only four pins pin1 VCC, pin2 RD, pin3 TD and pin4 GND, that is, the function of the existing 9-pin TTL optical module is realized, while the normal use of the optical module is not affected, the number of pins is reduced to four, the pin end width of the optical module is reduced, and the narrow space of special scenes and special equipment is adapted; in addition, the PCB board of the optical module of the present application is directly placed in the communication equipment without a shell, further reducing the volume of the optical module, reducing the production cost, improving the reliability and stability of the optical module.

[0023] Embodiment 2, the present embodiment is a further improvement based on embodiment 1, which is as follows:

[0024] The data receiving circuit comprises U4A (operational amplifier), JP2 (4-pin interface), C5, C6, R14, R15, R16, R17, R18 and R19;

[0025] Pin 1 of U4A is electrically connected with pin 2 RD, pin 8 of U4A is electrically connected with pin 1 VCC, pin 4 of U4A is electrically connected with pin 4 GND, pin 2 of U4A is electrically connected with one end of R17 and one end of R18, the other end of R18 is electrically connected with pin 1 VCC, the other end of R17 is electrically connected with one end of R15 and one end of R16, pin 3 of U4A is electrically connected with one end of R14, the other end of R16 is connected with pin 4 GND, the other end of R15 is connected with the other end of R14 and pin 2 of JP2, pin 1 of JP2 is connected with one end of R19 and C6, the other end of C6 is electrically connected with pin 4 GND, the other end of R19 is electrically connected with one end of C5 and pin 1 VCC, the other end of C5 is electrically connected with pin 4 GND, pin 4 of JP2 is electrically connected with pin 4 GND.

[0026] Embodiment 3, this embodiment is a further improvement on the basis of embodiment 1, which is as follows:

[0027] The data sending circuit comprises JP1 (4-pin interface), U1 (logic gate), U2 (logic gate), U3 (operational amplifier), R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, C1;

[0028] Pin 2 of U1 and pin 2 of U2 are electrically connected with pin 3 TD, pin 3 of U1 and pin 3 of U2 are electrically connected with pin 4 GND, pin 5 of U1 and pin 5 of U2 are electrically connected with pin 1 VCC, pin 4 of U1 is electrically connected with one end of R1, pin 4 of U2 is electrically connected with one end of R2, the other end of R2, the other end of R1 and one end of R3 are electrically connected with pin 4 of JP1, pin 1 of JP1 is connected with one end of R8, one end of R9 and pin 1 VCC, pin 2 of JP1 is electrically connected with pin 4 GND, the other end of R9 is electrically connected with one end of R10 and one end of R6, the other end of R10 is electrically connected with pin 4 GND, the other end of R6 is electrically connected with pin 1 of U3, pin 2 of U3 is electrically connected with pin 4 GND, pin 5 of U3 is electrically connected with pin 1 VCC, pin 4 of U3 is electrically connected with the other end of R3 and one end of R7, the other end of R7 is electrically connected with pin 3 of U3, one end of R5 and one end of R4, the other end of R4 is electrically connected with pin 4 GND, the other end of R5 is electrically connected with one end of C1, one end of R11, the other end of R8 and pin 3 of JP1, the other end of R11 is electrically connected with the other end of C1 and pin 4 GND.

[0029] Embodiment 4, this embodiment is a further improvement on the basis of embodiment 3, which is as follows:

[0030] The data transmitting circuit further comprises C2, C3 and C4; one end of C2, one end of C3 and one end of C4 are connected to the common end of pin1 VCC and pin1 of JP1, and the other end of C2, the other end of C3 and the other end of C4 are electrically connected with pin4 GND.

[0031] Embodiment 5, this embodiment is a further improvement on the basis of embodiment 1, which is specifically as follows:

[0032] Further comprising C10 and C11, one end of C10 and C11 is electrically connected with pin1 VCC, and the other end of C10 and C11 is electrically connected with pin4 GND.

[0033] Embodiment 6, this embodiment is a further improvement on the basis of embodiment 1, which is specifically as follows:

[0034] The width of the pin end of the PCB is 13mm. Compared with the existing 9-pin optical module pin end width of 23mm, the 4-pin optical module reduces the pins to 4, and the width of the pin end is only 13mm, which can be well applied to some devices with narrow pin end installation width.

[0035] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and modify the above-mentioned embodiments within the scope of the utility model.

Claims

1. A 4-pin TTL optical module, characterized in that, The application relates to a data receiving and sending circuit, which comprises a PCB board, a data receiving circuit and a data sending circuit integrated on the PCB board, four pins arranged on the PCB board, the four pins being pin1 VCC, pin2 RD, pin3 TD and pin4 GND in sequence, the data receiving circuit being electrically connected with the pin2 RD, and the data sending circuit being electrically connected with the pin3 TD.

2. The 4-pin TTL optical module of claim 1, wherein, The data receiving circuit comprises U4A, JP2, C5, C6, R14, R15, R16, R17, R18 and R19. Pin1 of the U4A is electrically connected with the pin2 RD, pin8 of the U4A is electrically connected with the pin1 VCC, pin4 of the U4A is electrically connected with the pin4 GND, pin2 of the U4A is electrically connected with one end of the R17 and one end of the R18, the other end of the R18 is electrically connected with the pin1 VCC, the other end of the R17 is electrically connected with one end of the R15 and one end of the R16, pin3 of the U4A is electrically connected with one end of the R14, the other end of the R16 is connected with the pin4 GND, the other end of the R15 is connected with the other end of the R14 and pin2 of the JP2, pin1 of the JP2 is connected with one end of the R19 and one end of the C6, the other end of the C6 is electrically connected with the pin4 GND, the other end of the R19 is electrically connected with one end of the C5 and the pin1 VCC, the other end of the C5 is electrically connected with the pin4 GND, and pin4 of the JP2 is electrically connected with the pin4 GND.

3. The 4-pin TTL optical module of claim 1, wherein, The data sending circuit comprises JP1, U1, U2, U3, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 and C1. The pin 2 of U1 and the pin 2 of U2 are electrically connected with the pin 3 TD, the pin 3 of U1 and the pin 3 of U2 are electrically connected with the pin 4 GND, the pin 5 of U1 and the pin 5 of U2 are electrically connected with the pin 1 VCC, the pin 4 of U1 is electrically connected with one end of R1, the pin 4 of U2 is electrically connected with one end of R2, the other end of R2, the other end of R1 and one end of R3 are electrically connected with the pin 4 of JP1, the pin 1 of JP1 is connected with one end of R8, one end of R9 and the pin 1 VCC, the pin 2 of JP1 is electrically connected with the pin 4 GND, the other end of R9 is electrically connected with one end of R10 and one end of R6, the other end of R10 is electrically connected with the pin 4 GND, the other end of R6 is electrically connected with the pin 1 of U3, the pin 2 of U3 is electrically connected with the pin 4 GND, the pin 5 of U3 is electrically connected with the pin 1 VCC, the pin 4 of U3 is electrically connected with the other end of R3 and one end of R7, the other end of R7 is electrically connected with the pin 3 of U3, one end of R5 and one end of R4, the other end of R4 is electrically connected with the pin 4 GND, the other end of R5 is electrically connected with one end of C1, one end of R11, the other end of R8 and the pin 3 of JP1, the other end of R11 is electrically connected with the other end of C1 and the pin 4 GND.

4. The 4-pin TTL optical module of claim 3, wherein, The data sending circuit further comprises C2, C3 and C4, one end of C2, one end of C3 and one end of C4 are connected to the common end of pin 1 VCC and pin 1 of JP1, the other end of C2, the other end of C3 and the other end of C4 are electrically connected with the pin 4 GND.

5. The 4-pin TTL optical module of claim 1, wherein, Further comprising C10 and C11, one end of C10 and one end of C11 are electrically connected with the pin 1 VCC, the other end of C10 and the other end of C11 are electrically connected with the pin 4 GND.

6. The 4-pin TTL optical module of claim 1, wherein, The width of the pin end of the PCB board is 13mm.

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