8-bit microcontrollers with USB interface for ST72774/ST72754/ST72734 LCD and CRT monitors. Reference data

Encyclopedia of radio electronics and electrical engineering / Application of microcircuits

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SGS-THOMSON ST72774/ST72754/ST72734 microcontrollers are manufactured using HCMOS technology and are designed for use in both CRT and LCD monitors. The block diagram of microcircuits is shown in fig. 1. The core of microcontrollers is implemented on an 8-bit processor with an extended set of instructions. The microcircuits operate at a clock frequency of 12 or 24 MHz (the internal core clock is 8 and 4 MHz, respectively) and are powered from a single 5 V supply. The microcircuits can be switched to standby mode by software, which can significantly reduce power consumption.

Rice. 1. Structural diagram of microcircuits

Each SGS-THOMSON chip includes: a master oscillator, a processor, bidirectional universal I/O ports, a misdirection protection node, a sync processor for timing and synchronizing the internal display, up to 60 kbytes of user ROM/EEPROM, up to 1 kbytes of RAM , interfaces USB, DDC, I²C, 16-channel 4-bit timer, 8-channel 10-bit ADC, eight 44-bit PWM outputs for analog control of external devices, and a reset circuit. Chips are manufactured in TQFP42, CSDIP42 and SDIP2 packages (Fig. 1). In table. 8 shows the differences between XNUMX-bit microcontrollers with a USB interface, depending on the type.

Current consumption: 14 mA (working mode) and 12 mA (standby mode).

Rice. 2. Chip packages TQFP44, CSDIP42 and SDIP42 from SGS-THOMSON

Table 1

Where:

(1) - time interval meter for auto-tuning the size and position of the image;

(2) - synchroprocessor;

(3) - generator of 10-bit PWM/BRM signals (6 bits - PWM, 4 bits - BRM), BRM bits allow you to get "fine tuning" of the output voltage with a step of VDD/1024;

(4) - low voltage reset circuit detector;

The purpose of the pins of the microcircuits is given in Table. 2.

Table 2

The electrical and timing characteristics of microcircuits are given in Table. 3-5.

Table 3

Table 4

Table 5

In table. 6 shows data on the amount of memory, the presence of TMU and USB units, depending on the type of microcircuit.

Table 6

(1) - EPROM, one-time programmable ROM

Publication: remserv.ru

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