Integrated circuit INF8577CN. Reference data

Encyclopedia of radio electronics and electrical engineering / Application of microcircuits

 Comments on the article

The INF8577CN chip is a liquid crystal display (LCD) control device with I2With display information receiving interface.
The microcircuit is placed in a 40-pin DIP package (Fig. 1). Functions performed by the scheme:	Rice. 1 Appearance of the microcircuit

• LCD control in direct or duplex mode, the microcircuit controls 32 LCD segments in direct mode and 64 segments in duplex mode;
• provision of bus interface I²WITH;
• Can be used as bus output expander I²C.

Its features:

• supply voltage - from 2,5 to 6 V;
• low power consumption;
• built-in generator for generation of LCD control signals;
• auto-incrementing data entry;
• the ability to switch display memory banks in direct control mode;
• the possibility of cascading chips to increase the number of controlled segments up to 256;
• blanking the display on power reset.

Its pinout is shown in Fig. 2, and the block diagram - in fig. 3. In fig. 4 shows the organization of the internal memory of the IP. The displayed information is stored in eight one-byte registers (their numbers are 0...7). Another similar register (control) stores the configuration information that controls the operation of the microcircuit. Registers O,2,4,6 are combined into bank "A", registers 1, 3, 5, 7 - into bank "B".

Rice. 2. Pinout of the microcircuit

Rice. 3. Structural diagram of the microcircuit

Rice. 4. Organization of the internal memory of the microcircuit

Rice. 5. Transfer of the first byte of information

Bus function I²C is described in sufficient detail in [1]. Consider the features of loading information into the INF8577CN chip. The first byte (Fig. 5) transmits the address of the slave ("Slave") device. The upper 7 bits of this byte determine the device address ("Slave" address), and the eighth bit determines the direction of data transfer. If the eighth bit is zero, then data is being transmitted to the slave device, if equal to one, then this device will be the transmitter. K I²Several devices with the same "Slave" address can be connected to the C-Bus. INF8577CN can only perform the function of a receiver, so the eighth bit is always "0". Its binary "Slave" address is 0111010. Thus, the first byte always contains the code 01110100.

Table 1

Table 2

Table 3

The second protocol byte I²The C-bus for the INF8577CN chip is always a control byte loaded into the corresponding register (Fig. 4). The most significant bit of this byte determines the mode of operation:

0 - LCD direct control mode (single-line mode);

1 - LCD multiplex control mode (two-line mode).

The next bit of this byte determines the LCD bank, the contents of which will be displayed on the segments in direct control mode: "0" - bank A, "1" - bank B. For multiplex control mode, this bit does not matter. The remaining six bits of this byte make up the segment vector. In fact, this vector is the address of the RAM (scheme number + register number), starting from which the loading of the displayed information begins. The segment vector combines RAM from several INF8577CN chips into a single address space. K I²Up to eight INF8577CN chips can be connected to the C-bus. The least significant three bits of the segment vector address one of the eight circuit registers, and the three most significant bits of the segment vector determine which of the INF8577CN chips will be selected. The data will be written to the chip for which these three bits match the subaddress set on the chip pins AO, A1, A2. This subaddress is formed according to the following rule:

- output A1 is an input, and it is necessary to apply an input level of zero or one to it;

- pins AO and A2 are inputs-outputs, and it is possible (but not necessary) to apply an input level of zero or one to them, or not to apply input voltage at all. In this case, the microcircuit perceives the state of the AO and A2 pins as a logical zero.

After the second byte, data transfer begins. The first byte of data is written to the RAM of one of the INF8577CN microcircuits - exactly to that microcircuit and to the place of the RAM pointed to by the segment vector. The chip that received the information generates an A-condition confirming the reception. After that, the segment vector is automatically incremented and the chips are ready to receive the next byte of data. The length of the data chain is not limited. All microcircuits track the change in the segment vector, and the data is automatically written to the RAM of the desired microcircuit. If the segment vector has reached the maximum value of 111111, then the next value will be 000000.

The increment value is 1 or 2 and is determined by the mode in which the microcircuits operate. The increment is 1 in the multiplex control mode, that is, the chip registers are loaded in a row, one after the other, regardless of which bank they belong to. In direct control mode, the increment value is 2, which ensures that either bank "A" or bank "B" is loaded, regardless of which one is displayed.

Rice. 6. LCD driver circuit with direct control

Rice. 7. Driver circuit with duplex control

In table. 1 shows the purpose of the IC pins, in table. 2 gives the limit and maximum allowable values ​​of the parameters, in table. 3 - basic electrical parameters. On fig. 6 shows a diagram of a direct control LCD driver, in fig. 7 is a diagram of a driver with duplex control, in fig. 8 - diagram of a 32-bit expander I²C-tires. It should be noted that in duplex control mode, it is necessary to use an LCD with two separate common terminals or two separate LCDs.

Rice. 8. Diagram of 32-bit expander I²C-tires

Literature

1. K. Konov. Interface I²C on TV. - Radio amateur, 2000, N9, S.24 ... 26

Publication: cxem.net

See other articles Section Application of microcircuits.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive Flexible 32-bit ARM microcontroller 24.07.2021 Unlike conventional semiconductor chips, flexible electronic devices are based on paper, plastic, or foil substrates and use active thin-film semiconductor materials, including organic compounds, metal oxides, and amorphous silicon. After six years of development, ARM introduced the first fully 32-bit flexible PlasticARM microcontroller, which consists of 56 thin-film NMOS transistors (Negative channel Metal-Oxide-Semiconductor) and resistors on a plastic substrate provided by the British manufacturing company PragmatIC Semiconductor from Cambridge. The chipset is implemented using the 0,8 micron PragmatIC process and standard tooling. It consists of four metal layers on a 200 mm polyimide plate. The two lower layers contain standard cells, and the two upper ones serve to connect them. This approach made it possible to bring the total valve density to approximately 300 per mm2. At 59,2 square millimeters, PlasticARM is 12 times the size of a previous joint development between ARM and PragmatIC - a dedicated FlexIC core for machine learning workloads - and marks a significant step forward in low-cost, flexible plastic electronics for everyday IoT-connected objects. As reported in an article published yesterday by the journal Nature, the flexible microcontroller includes a 32-bit CPU, NVIC (Nested Vector Interrupt Controller) for handling interrupts from external devices, peripherals, memory and interface, an AHB-lite interconnect bus and 456 bytes ROM. The firmware contains three test programs using the ARMv6-M instruction set and the standard ARM toolchain. The entire system-on-a-chip (SoC) runs at 29kHz from a 21V power supply and draws 45mW, of which the processor accounts for 33%, memory for 22%, and peripherals for the remaining XNUMX%. The main problem associated with plastic was energy consumption and heat dissipation. ARM's low-power cell libraries are predicted by ARM's engineers to be capable of supporting plastic chips with a complexity of around 100 gates (this will allow more peripherals to be used with the controller core). A million or more logic gates will likely require Complementary Metal Oxide Semiconductor (CMOS) technology.

Other interesting news:

▪ Grasshopper robot

▪ Profits from the sale of World of Warcraft servers will go to charity

▪ Film media

▪ Hydrofoil Electric Taxi Candela P-12

▪ Earthquake expected in New York

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Grounding and grounding. Selection of articles

▪ article Let's thunder to the fanfare! Popular expression

▪ article Which writer died of pseudonym cancer? Detailed answer

▪ Nurse article. Standard instruction on labor protection

▪ article Light relays. Encyclopedia of radio electronics and electrical engineering

▪ article Rising pencil. Focus Secret

Leave your comment on this article:

All languages ​​of this page

Arabic	Hebrew	Polish
Bengali	Hindi	Portuguese
Chinese	Italian	Spanish
English	Japanese	Turkish
French	Korean	Ukrainian
German	Malay	Vietnamese

Home page | Library | Articles | Website map | Site Reviews

www.diagram.com.ua
2000-2024