CN110991133B - High-low voltage identification control circuit used inside chip - Google Patents
High-low voltage identification control circuit used inside chip Download PDFInfo
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- CN110991133B CN110991133B CN201911180129.4A CN201911180129A CN110991133B CN 110991133 B CN110991133 B CN 110991133B CN 201911180129 A CN201911180129 A CN 201911180129A CN 110991133 B CN110991133 B CN 110991133B
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Abstract
The invention discloses a high-low voltage compatible identification control circuit used in a chip, which is used for identification control in a high-low voltage hybrid circuit with a high-voltage module and a low-voltage module. The identification control circuit comprises an input voltage division resistor string, a reference voltage division circuit resistor string, a comparator circuit and a plurality of logic AND gates, wherein the input voltage division resistor string and the reference voltage division circuit resistor string are respectively formed by connecting equivalent resistors in series. The invention can realize the high and low level identification of input under two input conditions of high voltage and low voltage through a level identification control circuit designed by a low voltage device, and further realize the low voltage domain control level output after identifying the high and low voltage through a control selection circuit.
Description
Technical Field
The invention relates to the field of electricity, in particular to a high-low voltage hybrid circuit used in a chip.
Background
In an integrated circuit design, there is an operating condition that a chip needs to be supplied with both high and low voltages, for example, in a chip circuit with a specific "fuse", in a programming mode, a voltage higher than a voltage required when a normal chip operates needs to be input to a corresponding pin, and in a normal operating mode, the corresponding pin still operates in a normal lower voltage range. The design of a low-voltage module under general process conditions cannot be realized by designing a transistor device which can meet high-voltage requirements, so that the low-voltage module cannot directly give consideration to high-voltage power supply. Under the condition, a certain pin of the chip needs to be input with high voltage and low voltage, and the inside needs to quickly identify the difference of the high voltage and the low voltage input by the pin and form a specific control function.
Disclosure of Invention
In view of the above problems in the prior art, it is desirable to provide a circuit capable of quickly recognizing the difference between the high voltage and the low voltage inputted from the pin and forming a targeted control.
The identification control circuit is characterized by comprising an input voltage division resistor string, a reference voltage division circuit resistor string, a comparator circuit and a plurality of logic AND gates, wherein the input voltage division resistor string is formed by connecting a first number of equivalent resistors in series, a first end of the input voltage division resistor string is connected to a high-voltage input, a second end of the input voltage division resistor string is grounded, the reference voltage division circuit resistor string is formed by connecting a second number of equivalent resistors in series, one end of the input voltage division circuit resistor string is connected to a low-voltage reference level of the low-voltage module, the other end of the input voltage division circuit resistor string is grounded, the comparator circuit comprises at least one group of comparators, each group of comparators corresponds to one logic AND gate, a first node is formed between any two resistors in the input voltage division resistor string, one first node is selected to be input to a b input of a first comparator in the corresponding comparators and a input of a second comparator based on an expected high-voltage input range, one second node is formed between any two resistors in the reference voltage division resistor string, the first node and the second node is directly output to the high-voltage module through the first input module and the second node, and the high-voltage module are directly output to the high-voltage module.
In a preferred implementation, the first resistor and the second resistor have the same resistance.
In another preferred implementation, the input range of the low-voltage input is: 0.1-1.8V.
In another preferred implementation, the input range of the high pressure input is: substrate breakdown voltage supported by the process.
In another preferred implementation, the resistance value of each resistor is determined based on the detection accuracy.
In another preferred implementation, the input terminal switches the resistor string tap voltage if the identification voltage value needs to be adjusted.
In another preferred implementation, the divided input voltage V is determined based on the following equation in_i And a divided reference voltage V ref_j
Divided input voltage V in_i Satisfies the following conditions:
divided reference voltage V ref_j Satisfies the following conditions:
the invention is used in a circuit which cannot be considered by a high-voltage device and a low-voltage device, can realize the high-low level identification of input under two input conditions of high voltage and low voltage through a level identification control circuit designed by the low-voltage device, and further realizes the control level output in a low-voltage area after the high voltage and the low voltage are identified through a control selection circuit.
Drawings
FIG. 1 is an overall functional block diagram of the identification control circuit of the present invention;
FIG. 2 is a circuit diagram of an input voltage-dividing resistor string in the identification control circuit according to the present invention;
FIG. 3 is a reference voltage dividing resistor string circuit in the identification control circuit of the present invention;
FIG. 4 is a functional block diagram of a comparator in the identification control circuit of the present invention;
FIG. 5 is a control logic circuit of the identification control circuit of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
The overall functional block diagram of one implementation way of the identification control circuit for the chip interior and considering high and low voltages is shown in fig. 1. The whole high-low voltage hybrid circuit comprises two types of voltage domain working modules: the identification control circuit is designed by adopting a low-voltage device, and the high-voltage module is designed by adopting a high-voltage device. Where low voltage modules cannot be implemented using high voltage devices subject to functional or performance limitations. The whole high-low voltage hybrid circuit is realized inside a target chip, for example, inside an FPGA.
Pin PAD gives consideration to the two kinds of working methods that provide high voltage input and provide low voltage input for the low pressure module for high pressure module. The low-voltage identification control circuit comprises two paths of voltage dividing resistor strings, a plurality of comparator (a group of comparators in pairs) circuits and corresponding logic AND gates, and the output of the logic AND gates is the control voltage output of a low-voltage domain.
The two-path voltage dividing resistor string comprises an input voltage dividing resistor string and a reference voltage dividing circuit resistor string, and the input voltage dividing resistor string is formed by connecting equivalent first resistors of a first number in series. For example, 100 equal value resistors. The first end of the input divider resistor string is connected to the high-voltage input, and the second end of the input divider resistor string is grounded.
The reference voltage division circuit resistor string is formed by connecting a second number of equivalent second resistors in series, one end of the reference voltage division circuit resistor string is connected to a low-voltage reference level of the low-voltage module, and the other end of the reference voltage division circuit resistor string is grounded. The first number and the second number may be the same as each other or different from each other.
The input range of the low-voltage input is 0.1 to the low-voltage supply voltage, for example, the input range of the low-voltage input can cover 0.1 to 1.8V under 0.18um CMOS process and 1.8V of the low-voltage supply voltage.
The input range of the high-voltage input is as follows: the maximum substrate breakdown voltage supported by the process, for example, the substrate breakdown voltage is about 10V in a 0.18um CMOS process, and the input range of the high-voltage input can be up to 10V.
As shown in FIGS. 1-2, in the present embodiment, the level signal V is inputted via the PAD pin in Different voltage-dividing inputs V are formed by connecting series resistors of input voltage-dividing circuits to ground in_i (ii) a Self power supply V of chip low-voltage module dd As a reference level, different divided voltage reference V is formed by connecting series resistors of a reference voltage dividing circuit to ground ref_j As shown in fig. 3.
For each specific application case, the approximate range of the high-voltage input module is known, so that two nodes can be selected on the voltage-dividing reference resistor string according to the input voltage of the high-voltage input module, the voltage-dividing reference signals at the two nodes are output to the positive input of the first comparator and the negative input of the second comparator in the pair of comparators respectively, then one node is selected on the input voltage-dividing resistor string according to the expected range of the input voltage of the high-voltage input module, the node is input to the negative input of the first comparator and the positive input of the second comparator in the pair of comparators respectively, then the output results of the two comparators in the pair of comparators are and-operated, and the and gate circuit has an output signal only when the two comparators are both positive, and the output signal is used as a control output. The selection of the nodes on the voltage-dividing resistor string and the selection of the nodes on the reference resistor string are such that the expected voltages of the nodes on the voltage-dividing resistor string fall within the reference voltage range on two nodes on the reference resistor string.
Using the identification control circuit of the present invention, a level signal V is input in Can support the power supply V far larger than the low-voltage module dd The specific upper limit of the voltage of (3) may be implemented by adjusting the input voltage-dividing resistor string.
Divided input voltage V in_i Satisfies the following conditions:
divided reference voltage V ref_j Satisfies the following conditions:
in order to ensure the matching characteristic of each resistor, the values of the unit resistors R are required to be the same in the design.
The values of different taps of the input voltage-dividing resistor string and the reference voltage-dividing resistor string are different, and the input voltage V is measured according to the actual circuit in The identification range requirements of the voltage divider resistor string and the reference voltage divider resistor string are different, and the two comparators can simultaneously perform comparison operation.
The result of the comparator is passed through a logic AND gate, so that the input voltage V can be quickly determined in And then a corresponding subsequent required low-voltage domain control enabling signal is given through the low-voltage circuit. At least two comparators are providedOne for determining the upper limit of the input voltage and the other for determining the lower limit of the input voltage. Of course, it is also possible to provide more sets of comparators for multiple ranges of comparison, for example, a first set of comparators connected to a relatively small range of reference voltage nodes, followed by a set of comparators having a larger range of reference voltage nodes.
The circuit can identify the input within the self power supply voltage range of the chip, and can also effectively identify the level which is higher than the self voltage range, thereby realizing the identification capability of taking high voltage and low voltage into consideration. According to actual requirements, a plurality of comparators working under the condition of low-voltage power supply are connected in parallel to divide the voltage of the input voltage V in_i With simultaneous and different divided reference voltages V ref_j Performing selective comparison to input voltage V in_i If between the corresponding divided reference voltages, a high level V is output dd Otherwise, the low level 0 is output.
Below with a low-voltage supply voltage V dd 3.3V, the PAD input level of the pin to be recognized is 9.5V, and the recognition error range ± 1V is taken as an example to describe the embodiment of the present invention in detail.
In the first step, the input voltage divider circuit is shown in FIG. 2, and V is input in =9.5V, n is designed to be 95, tap voltage position i =86 is selected, and V is output according to equation (1) in_86 ＝1V。
Second, the reference divider circuit is shown in FIG. 3, V dd Design m as 33, select two tap reference voltage positions j1=23 and j2=25, and obtain an output V according to equation (2) ref_25 ＝0.9V,V ref_23 ＝1.1V。
Thirdly, selecting the comparator unit shown in fig. 4, and finally outputting out as logic 1 (i.e. analog voltage V) by the control logic circuit of fig. 5 dd ) Determine the level V in_86 The input level is between 0.9V and 1.1V, and the input level can be reversely deduced to be between 8.55V and 10.45V through the formula (1) proportion, so that the input level 9.5V is identified.
By analogy, the judgment function of the low-voltage circuit module on different level intervals of high-voltage input can be realized by different resistor taps in the same control logic circuit mode.
While the principles of the invention have been described in detail in connection with the preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing embodiments are merely illustrative of exemplary implementations of the invention and are not limiting of the scope of the invention. The details in the examples are not to be construed as limitations on the scope of the invention, and any obvious modifications, equivalent alterations, simple substitutions, etc. based on the technical solution of the present invention are intended to fall within the scope of the present invention without departing from the spirit and scope of the present invention.
Claims (7)
1. The identification control circuit for both high voltage and low voltage in a chip is used for identification control in a high-voltage and low-voltage hybrid circuit with a high-voltage module and a low-voltage module, and is characterized by comprising an input voltage-dividing resistor string, a reference voltage-dividing circuit resistor string, a comparator circuit and a plurality of logic AND gates, wherein the input voltage-dividing resistor string is formed by serially connecting a first number of equal-valued resistors, a first end of the input voltage-dividing resistor string is connected to a high-voltage input, a second end of the input voltage-dividing resistor string is grounded, the reference voltage-dividing circuit resistor string is formed by serially connecting a second number of equal-valued resistors, one end of the reference voltage-dividing circuit resistor string is connected to a low-voltage reference level of the low-voltage module, the other end of the reference voltage-dividing circuit resistor string is grounded, the comparator circuit comprises at least one group of comparators, each group of comparators corresponds to one logic AND gate, a first node is formed between any two resistors in the input voltage-dividing resistor string, one first node is selected based on an expected high-voltage input range, the first node is respectively input to a input of the first comparator and a input of the second comparator, a second node in the reference voltage-dividing resistor string, the two second nodes are respectively input to a input of the first comparator, and output of the first comparator, and the high-voltage module are directly output of the high-voltage module.
2. The identification control circuit compatible with high and low voltages of claim 1, wherein the first resistor and the second resistor have the same resistance.
3. The identification control circuit compatible with high and low voltages according to claim 1, wherein the input range of the low voltage input is as follows: 0.1-3.5V.
4. The identification control circuit compatible with high voltage and low voltage as claimed in claim 1, wherein the input range of the high voltage input is: substrate breakdown voltage supported by the process.
5. The identification control circuit compatible with high and low voltages according to claim 1, wherein the resistance value of each resistor is determined based on the detection accuracy.
6. The identification control circuit compatible with high and low voltages as claimed in claim 1, wherein the input terminal switches the tap voltage of the resistor string if the identification voltage value needs to be adjusted.
7. The identification control circuit for both high and low voltages as claimed in claim 1, wherein the divided input voltage V is determined based on the following formula in_i And a divided reference voltage V ref_j
Divided input voltage V in_i Satisfies the following conditions:
divided reference voltage V ref_j Satisfies the following conditions:
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| CN201911180129.4A CN110991133B (en) | 2019-11-27 | 2019-11-27 | High-low voltage identification control circuit used inside chip |
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| CN201911180129.4A CN110991133B (en) | 2019-11-27 | 2019-11-27 | High-low voltage identification control circuit used inside chip |
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| CN103516349A (en) * | 2012-06-26 | 2014-01-15 | 深圳市威尔科思技术有限公司 | High-voltage compatible input system |
| CN109842401B (en) * | 2017-11-24 | 2023-07-04 | 龙芯中科技术股份有限公司 | Latch-up resistant device and CMOS chip |
| CN110086143B (en) * | 2019-06-12 | 2021-02-19 | 上海艾为电子技术股份有限公司 | Input voltage divider circuit and overvoltage protection switch |
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