TMPA8823 pin function and voltage data

Filter 18.432M

The MCU section includes several key pins for different functions. Pin 2 is a MAIN -DET I, an 8-bit A/D converter input used for AC power voltage sampling. This signal is sent to the comparator, and the CPU evaluates and displays the AC voltage value. Pin 3 is a KEY I, also an 8-bit A/D converter input that receives signals from the panel key matrix. These analog voltages are converted and compared by the CPU to identify which key is pressed. Pin 4 is uP DVss, which serves as the ground for the digital circuit block. Pin 5 is Reset I/O, handling the reset signal input and system clock output. Pins 6 and 7 (Xout/Xin) are crystal connection pins, typically connected to an 8MHz crystal. Pin 8 is TEST I, used to output a test signal when active and grounded otherwise. Pin 9 is uP DVdd, providing 5V power to the digital circuit block. Pin 10 is uP V-Vss, grounding the CCD circuit block. Pin 54 is uP AGND, the ground for the oscillating circuit block. Pin 55 is uP AVdd, supplying 5V power to the oscillating circuit block. Pin 56 is NC, reserved for future use. Pin 1 is U/VO, an 8-bit D/A converter (PWM) used for band selection. Pin 61 is H/LO, while pin 57 is SDA I/O, part of the I2C bus for serial data input/output. Pin 58 is SCL I/O, responsible for the I2C serial clock signal. Pin 59 is System O, an 7-bit D/A converter (PWM) for sound system selection. Pin 60 is VT O, a 14-bit D/A converter (PWM) for high-frequency tuner tuning voltage output. Pin 62 is TV sync. I, serving as an external interrupt or count input for composite sync signals. Pin 63 is RMT-In, receiving remote control signals. Pin 64 is LED O, managing standby output for LED drive, power operation, reset control, and mute signal processing. Pin 11 is TV AGND, the ground line for the analog circuit block. Pin 12 is FBP In I, receiving the FBP reverse pulse. Pin 13 is H Out O, outputting row drive pulses. Pin 14 is HAFC 1, connecting to the line AFC circuit's external filter, controlling the H-VCO frequency. Pin 15 is V saw I, connecting to an external sawtooth wave capacitor. The amplitude is regulated by V-AGC to maintain consistency. Pin 16 is V out O, outputting field drive pulses. Pin 17 is H Vcc, providing 9V power to the DEF (deflection circuit). Pin 18 is NC, reserved. Pin 19 is Cb In I, receiving the Cb color difference component signal. Pin 20 is Y In I, for the Y signal input. Pin 21 is Cr In I, for the Cr color difference component signal. Pin 22 is TV DGnd, connecting to the digital circuit block ground. Pin 23 is C In I, for the chrominance signal input. Pin 24 is Ex.CVBS/Y In I, receiving external composite video signals. Pin 25 is TV DVcc, providing 3.3V power to the digital circuit block, derived from partial voltage division of H-Vcc. Pin 26 is TV In I, receiving the processed composite video signal. Pin 27 is ABCL I, for the ABCL (Color Saturation, Brightness Limit) signal input. Pin 28 is AU out O, outputting audio signals to the audio power amplifier. Pin 29 is IF Vcc, providing 9V power to the IF circuit block. Pin 30 is TV out O, outputting the PIF detection signal (full TV signal). Pin 31 is SIF out O, outputting the SIF detection signal (sound second IF signal). Pin 32 is Ext. Au In I, for external audio signal input. Pin 33 is SIF In I, for the audio second IF signal input. Pin 34 is DC -NF I, connecting the acoustic DC negative feedback signal. Pin 35 is PIF -PLL I, connecting the PIF-PLL loop filter, determining the PIF-VCO frequency. Pin 36 is IF Vcc, providing 5V power to the IF circuit block. Pin 37 is Reg Fil I, connecting a filter capacitor to stabilize internal bias. Pin 38 is De Emphasis I, connecting the SIF detection signal to a weighting capacitor. Pin 39 is IF AGC I, connecting the IF AGC filter. Pin 40 is IF GND, the ground terminal for the IF circuit. Pins 41 and 42 are differential amplifier inputs, receiving the IF TV signal from the surface acoustic wave filter. Pin 43 is RF-AGC O, outputting the RF-AGC control voltage to the high-frequency tuner. Pin 44 is Y/C Vcc, providing 5V power to the Y/C circuit block. Pin 45 is A/V Out O, outputting CVBS/Y signals. Pin 46 is Black Det I, connected to the black level detection filter, with the voltage on this pin determining the black level extension threshold. Pin 47 is Chroma APC I, connecting to the APC filter of the color decoding circuit, with the terminal voltage controlling the VCXO (Crystal Voltage Controlled Oscillator) frequency. Pin 48 is Ik In I, receiving the AKB cathode current sampling signal. Pin 49 is RGB Vcc, providing 9V power to the RGB circuit block. Pins 50, 51, and 52 are R Out O, G Out O, and B Out O, respectively, outputting baseband R, G, and B signals to the video amplifier and discharge circuits. Pin 53 is TV AGND, connecting to the analog circuit block ground.