Teclast X21, Service Manual

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4 /EN IC enable pin
5 GND System grounding
6 IMIN Minimum current setup
7 IREF Charge current setup
3.5.10 Function introduction to S80829
The S-808xxC series is a series of high-precision voltage detectors developed using CMOS process. The
detection voltage is fixed internally with an accuracy of ±2.0%. Two output forms, Nch open-drain and CMOS
output, are available. Ultra-low current consumption and miniature package lineup can meet demand from the
portable device applications.
Pin Contiguous signal name Function description
1 RST Control signal voltage output pin
2 VDD Voltage input pin
3 NC Unused
4 VSS Grounding
3.5.11 Function introduction to TEA5767HN
The TEA5767HN is a single-chip electronically tuned FM stereo radio for low-voltage application with fully
integrated IF selectivity and demodulation. The radio is completely adjustment-free and only requires a
minimum of small and low cost external components. The radio can be tuned to the European, US and
Japanese FM bands.
Pin function is shown as the following figure
：
Pin Contiguous signal name Function description
1 NC Unused
2 CPOP
3 VCOT1 Tuning output voltage oscillator 1
4 VCOT2 Tuning output voltage oscillator 2
5 VCOVCC Tuning oscillator power supply
6 DGND Digital ground
7 DVCC Digital power supply
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