Chips for TV equipment ST63140, ST63142, ST63126, ST63156. Reference data

Encyclopedia of radio electronics and electrical engineering / Application of microcircuits

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8-bit TV controllers ST63140, ST63142, ST63126, ST63156

Controllers ST63140, ST63142, ST63126, ST63156 are designed for use in household television equipment. They differ in the amount of built-in read-only memory (ROM) and the configuration of interface units. These controllers use interface modules for various purposes, which allow the use of these microcircuits in various television equipment.

Main parameters and functions of microcircuits

In addition, controllers have:

• up to 18 software-controlled inputs / outputs, of which up to 8 outputs that allow direct connection of LEDs;
• three inputs for polling local keyboard buttons;
• up to four range switching outputs;
• two independent timers;
• tracking timer;
• serial interface supporting S-bus and I protocols²C;
• up to four 6-bit digital-to-analog converters (DAC);
• separate 62,5 kHz clock output;
• 14-bit tuning voltage synthesizer (ST63156 and ST63140);
• ADC for the implementation of the auto-tuning function of the TV tuning frequency;

The on-screen menu (OSD) block of the controllers provides display on the TV screen of 5 lines of 15 characters using a set of 128 characters (two banks of 64 characters).

For each controller, debug versions of microcircuits with reprogrammable ROM (programs) are released. A hardware-software complex for emulating controller data is also being produced, connected to a personal computer via a serial port.

On fig. 1 shows a block diagram of the controllers. In table. 1PDIP40. The location of the pins of the ST63140 and ST63142 microcircuits is shown in fig. 2, a ST63126 and ST63156 - in fig. 3.

Table 1

Fig. 1

Fig. 2

Fig. 3

Table 2

In table. 2 shows the decoding of signals at the outputs of microcontrollers.

Vertical scan controllers with powerful output stage TDA1771, TDA8174(A)

Microcircuits TDA1771/8174(A) are used as vertical scan output stages in TVs and computer monitors.

The microcircuits include the following nodes:

• sawtooth voltage generator;
• buffer cascade;
• powerful output stage;
• beam return generator;
• reference voltage source;
• overheat protection circuit.

In addition, microcircuits have independent adjustment of the output signal level.

Microcircuits are almost identical in internal structure. The main differences are in the case type and pin assignment.

When mounting, the microcircuits must be installed on an additional heatsink.

TDA1771 is available in a SIP10 package, and TDA8174(A) is available in two versions: MULTIWATT11 and CLIP-WATT11.

Table 3

Fig. 4

The diagram for connecting microcircuits is shown in fig. 4 (in brackets are the pin numbers TDA8174 (A)), pin assignment - in table. 3.

The main parameters

Publication: cxem.net

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