Bidirectional transmission interface circuit between two non-communicated power supply systems
A two-way transmission and interface circuit technology, applied in the direction of circuit devices, AC and DC network circuit layout, electrical components, etc., can solve the problems of complex circuits and ineffective transmission, and achieve low-cost effects
Inactive Publication Date: 2010-09-22
广芯电子技术(上海)股份有限公司
View PDF0 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] But this structure has a disadvantage, that is, the selection of the gate voltage of the transmission tube M1. Assuming that the gate voltage of M1 is VCC2, when VCC2>VCC1+Vth(M1), when a high level is transmitted from terminal 1 to terminal 2, one point can be pulled As high as VCC1, the transmission tube M1 is always in the conduction state, so the 2 points cannot be pulled to VCC2 due to the restraint of VCC1, so the high level cannot be effectively transmitted, and a current path is formed from VCC2 to VCC1, such as figure 2 As shown, this phenomenon is undesirable
In order to avoid this situation, the gate terminal of M1 should be connected to the lower voltage of VCC1 and VCC2, but the size of VCC1 and VCC2 is uncertain for different applications, so an additional comparison judgment circuit is required to compare VCC1 first The size of VCC2 and then select the smaller one as the gate voltage of M1, which makes the circuit more complicated
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0011] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0012] Depend on image 3 It can be seen that the present invention includes: the first resistor R1 connected to the first power supply voltage VCC1 and the second resistor R2 connected to the second power supply voltage VCC2; also includes: the first NMOS transistor M1 and the second NMOS transistor M2; the first NMOS transistor M1 and the gate of the second NMOS transistor M2 are respectively connected to the first power supply voltage VCC1 and the second power supply voltage VCC2, the source of the first NMOS transistor M1 is connected to one end of the first resistor R1, and the drain of the first NMOS transistor M1 is connected to The source of the second NMOS transistor M2 is connected, and the drain of the second NMOS transistor M2 is connected to one end of the second resistor R2.
[0013] The present invention uses two NMOS transistors...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a bidirectional transmission interface circuit between two non-communicated power supply systems, which comprises: a first resistor that is connected with a first power supply voltage, a second resistor connected with a second power supply voltage, a first NMOS transistor, and a second NMOS transistor; gates of the first NMOS transistor and the second NMOS transistor are respectively connected with the first power supply voltage and the second power supply voltage, a source electrode of the first NMOS transistor is connected with one end of the first resistor, a drain of the first NMOS transistor is connected with a source electrode of the second NMOS transistor, and a drain of the second NMOS transistor is connected with one end of the second resistor; and the bidirectional transmission interface circuit has the beneficial effects of ensuring high level to be effectively transmitted with low cost.
Description
technical field [0001] The invention relates to an interface circuit, in particular to a bidirectional transmission interface circuit between two unconnected power supply systems. Background technique [0002] Depend on figure 1 It can be seen that terminal 1 and terminal 2 are respectively connected to two sets of unreachable power systems (VCC1 and VCC2). The transmission principle is: taking the transmission from terminal 1 to terminal 2 as an example, when transmitting low level, node 1 is externally connected to open-drain The N tube is driven to the ground. Since the M1 tube is on, and its on-resistance is much smaller than R2, point 2 is also pulled to the ground, that is, the low level is transmitted to point 2; when the external open-drain After the N-tube drive is turned off, the two nodes 1 and 2 are pulled to their respective power supply voltages by R1 and R2, thus completing the high-level transmission. The process of data transmission from 2-side to 1-side i...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H02J4/00
Inventor 戴忠伟张远斌
Owner 广芯电子技术(上海)股份有限公司