In the past two years, under the driving of Apple iPhone, the smartphone market has expanded. An important feature of portable products such as smartphones is more and more, which supports wider consumer demand. However, portable products such as smartphones are used to support different functions integrated circuit (IC) or module operating voltages, such as baseband processors and application processor voltages are generally between 1.5 V to 1.8 V, and there are many outside The working voltage is typically 2.6 to 3.3 V, such as the USIM card, Wi-Fi module, FM (FM) tuner module operating voltage is 2.8 V, and the camera module is 2.7 V.
Figure 1: Schematic diagram of the logic level converter application.
Therefore, there is an input / output voltage mismatch problem between different ICs and peripheral modules such as smartphones such as input / output voltage mismatches, so that these devices are communicated with the modules, requiring efficient logic voltage level conversion. The so-called logic level converter is connected to the IC and module or printed circuit board (PCB) of different operating voltages, providing system integration solutions.
Traditional logic level conversion method and its advantages
Table 1: Traditional logic level conversion method and advantages and disadvantages
Since transistor-transistor logic (TTL) and complementary metal oxide semiconductors (CMOS) are standard levels in logic circuits, TTL-CMOS input conversion is common due to the traditional logic level conversion method. This conversion method is simple, low cost, mainly for low levels to high conversion, and can also be used to convert high levels to low. This conversion method also has some shortcomings. Other conventional logic level conversion methods include overvoltage tolerance (OVT) voltage conversion, drain open circuit (OD) / active lower pulling conversion and discrete I2C conversion, etc., each has its own advantages and disadvantages, see Table 1.
Dual power logic level conversion and application
The power will be consumed in the logic level conversion. For example, in low to high conversion, in order to output a high logic level, the input voltage (Vin) is lower than Vcc, and the power supply current change (ΔICC) is always higher, so power consumption is also high. In order to solve the problem of high power consumption, a dual supply voltage (VCCA and VCCB) logic level converter can be used. When the logic power supply voltage (VL) is equal to VIN, the ΔICC is 0, thereby reducing power consumption.
Common Dual Power Logic Level Conversion includes one-way conversion, bidirectional conversion of the band direction control pins, automatically sensing two-way conversion (push-pull output) and automatic sensing bidirectional conversion for drain open circuit applications (such as I2C), etc. The structure is shown in Figure 2.
Figure 2: Schematic diagram of several dual power logic level converters
In these dual power logic level conversion methods, the principle of one-way logic level conversion is to provide a point to B-point conversion when output enable,) is low, and when the output is enabled, the output is high. High-resistance (HI-Z) is present between A, B, usually treated with infinite resistance, which is equivalent to not being turned on. Common dual power-to-digital logic levels include NLSV1T34AMX1TCG, NLSV4T244Mutag, NLSV8T244Mutag, NLSV22T244Mutag, NLSV22T244Mutag, NLSV22T244Mutag, NLSV4T244Mutag, NLSV22T444Mutag, etc. Applications of these dual power supply-to-channel logic level converters include Universal Input Output (GPIO) ports, serial section (SPI) ports, and universal serial bus (USB) ports.
The working principle of the bidirectional logic level converter with directional control pins is that the pin and direction control (Direction, T /) pins provide a low level, providing B points to a point conversion; pins are low When the T / pin is high, it provides a point to B-point conversion; when the pin is high, the A point to the B point direction and the B point to the direction are in high resistance, which is equivalent to not picking up Pass. Ans Many Semiconductors will introduce a two-way logic level converter with directional control pins. Common applications for such converters are memory and I / O devices accessed in bytes (byte).
The working principle of the automatic sense of the two-way logic level converter (push-pull output) is: When the enable (EN) pin is low, the converter is in standby; the EN pin is high, I / O level When the converter is in steady state; the EN pin is high, the I / O level changes, the converter detects changes, and generates a pulse, I / O borrows P-channel MOSFET (PMOS) Faster. Typical automatic sensing direction bidirectional logic level converter (push-pull output) has NLSX3012Mutag, NLSX3013BFCT1G, NLSX4014Mutag, and NLSX4014Mutag, and NLSX3018Mutag, and NLSX3018Mutag, and NLSX3018Mutag, and NLSX3018Mutag. Common applications for such converters include universal asynchronous transceivers (UART), USB ports, 4-wire SPI ports, and 3-wire SPI ports.
The automatic sensing bidirectional logic level converter for drain open circuit applications (such as I2C) also includes three states: the EN pin is high, when NMOS is turned on, in operation, input terminal I / O level Dressing to the ground, that is, input low; the EN pin is high, the NMOS is in the working state, the output terminal I / O pulls up to VCC, that is, the input high level; EN pin When it is low, the converter is in standby. Typical automatic sensing bidirectional logic level converters for drain open applications (such as I2C) are NLSX4373Mutag, NLSX4348FCT1G, and NSLX4378BFCT1G, such as Ansian Semiconductors. Common applications for such converters include I2C bus, user identification module (SIM) card, single line (1-wire) bus, display module, secure digital input / output (SDIO) card, etc.
In the above-mentioned double power logic level converters, the automatic sensing converters and converters with directional control pins and converters with direction control pins have their advantages. The advantage of the automatic sensing converter is mainly reflected in minimizing the I / O lines of the microcontroller, which is a simple solution for asynchronous communication, and the disadvantage is a converter with a cost greater than and the bandwidth is lower than the direction control pin. The converter advantage of the directional control pin is a simple solution for the commodity components. It is a simple solution for memory mapping I / O, which is a large number of microcontroller pins.
In the automatic sensing converter without the directional control pins, there is also an integrated scheme (such as NLSX3373) and discrete scheme (such as NTZD3154N). The integrated scheme NLSX3373 is a single IC, and it is estimated that the occupied circuit board (PCB) space is only 2.6 mm2; discrete scheme NTZD3154N uses a double MOSFET and 4 01005 packages (ie 0402) resistance, estimated to occupy the total PCB total space of 3.3 MM2. The integrated scheme provides low power standby mode, and the discrete scheme does not provide high impedance / standby mode. The low pressure working characteristics, bandwidth and circuit characteristics of these two different programs are also different.
Anshen Semiconductor Dual Power Level Converter Specification and Requirements
Ann Many Semiconductor's dual power logic level converter reflects many advantages compared to competitive devices. These advantages include: a wider voltage conversion range, lower static power consumption and / or support higher data rates. Such as Anssan Semiconductor with push-pull output automatic sensing bidirectional converter NLSX3013 dual power conversion range 1.3 V to 4.5 V and 0.9 V to VCC - 0.4 V, performance close competition device is 1.65 V to 3.6 V and 1.2 V to VCC - 0.4 V; The data rates supported by both are 140 Mbps and 100 Mbps, respectively. See Table 2 for more specific comparisons.
Table 2: Comparison of Normal Semiconductor Dual Power Logic Level Converters and Competitive Devices
Ann Many Semiconductor with push-pull output automatic sensing bidirectional converter, such as NLSX4014, with its input drive current requirements. Assume that I / O supply voltage VL (A point) = 0 V, and is converted to 2.8 V (that is, converted from low level to high), the first A point = B point = 0 V, IIN1 flows into the CMOS device, Therefore, IIN? IIN2, peak current IIN? 2.8 V / 1 kΩ = 2.8 mA. Such a converter is designed to drive CMOS input, and should not use a resistance of resistance to 50 kΩ (see Figure 3). In addition, in large capacitive loads, the push-pull automatically senses the bidirectional converter, otherwise the output distortion will be large, and the Switch type level converter should be used.
Figure 3: Automatic sensing push-pull converter input drive current requirements
In addition, these dual power level converters of the Ansian Semiconductors use small and strong packages such as ULLGA6, UDFN6, UDFN8, UQFN12, UDFN20, Ubump11, Ubump12, and Ubump 20, where UDFN6 package is only 1.2 mm × 1.0 mm, The UBUMP12 package is only 1.54 mm × 2.02 mm. These small and strong packages are ideal for portable applications such as smartphones.
ANAN STAD Semiconductor Complete Logic Level Converter
ANANM SSS has a high performance, high-energy silica plan supplier, launched a logic level conversion scheme with a lineup, such as a dual power converter, a minigatetm series switch with OVT, MinigateTM bus switch, etc.
Among them, the dual power supply voltage logic level converter supports a wide range of high and low to high conversion, and supports one-way and bidirectional signal flow, low power consumption, and ultra-small package. MINIGATETM with OVT is used to meet a wide range of high to low level conversion and one-way signal stream application requirements, which are standard components, standard and ultra small package, low cost. In addition, the MINIGATM bus switch of the Ansian Semiconductor is about to be introduced to meet high speed (bandwidth above 500 MHz) and high to low level conversion application requirements, support two-way signal flow and one-way conversion, using standard package and ultra-small package, low cost. These devices are used to meet the different needs of our customers. Figure 4 shows the application of the Ansian Semiconductor Different Logic Level Conversion Schemes in the mobile phone.
Figure 4: Schematic diagram of the Anni Sky Semiconductor Logic Level Conversion Scheme in your mobile phone
Summarize:
The high-performance, high-energy silica plan supplier, high-energy silicon plan supplier, launched a series of logic level converters such as smartphones, including various dual supply voltage logic level converters with overvoltage MinigateTM series switches and high-speed applications of MinigateTM bus switches. These devices of the Anshan Semiconductors provide more excellent norms than competitive devices, such as a broader conversion voltage range, lower static power consumption and support for higher data rates. Anshen Semiconductor's logic converters provide different configuration and bit width, and use small and strong packages, which is ideal for portable applications of various logic level conversion requirements.
Be
Source: Wiku Electronic Market Network
Our other product:
