Teclast X21, Service Manual

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Pin function is shown as the following figure:
Pin Contiguous signal name Function description
1 /RESET Output reset low level
2 VCC IC power supply
3 GND rounding
3.5.3 Function introduction to PQ1X281
PQ1X281 may output fixed voltage 2.8V, EN pin is enable end, high level works. The feature of the 2.8V
voltage outputted by this IC is small ripple and pure voltage, which is used to supply power for audio system,
FM and microphone.
Pin function is shown as the following figure:
：
Pin Contiguous signal name Function description
1 VIN DC input
2 GND Grounding
3 EN Enable end
4 BYPASS Form filtering circuit with external resistor
5 VOUT Voltage output
3.5.4 Function introduction to TC58512FT
Offered in 512M×8bit, the K9K4G08U0M is 4G bit with spare 128M bit capacity. Its NAND cell provides
the most cost-effective solution for the solid state mass storage market. A program operation can be
performed in typical 200µs on the 2112-byte page and an erase operation can be performed in typical 2ms on
a 128K-byte block. Data in the data page can be read out at 30ns cycle time per byte. The I/O pins serve as
the ports for address and data input/output as well as command input. The on-chip write controller automates
all program and erase functions including pulse repetition, where required, and internal verification and
margining of date Even the write-intensive systems can take advantage of the K9K4G08U0M's extended
reliability of 100K program/erase cycles by providing ECC(Error Correcting Code) with real time mapping-out
algorithm. The K9K4G08U0M is an optimum solution for large nonvolatile storage applications such as solid
state file storage and other portable applications requiring non-volatility. An ultra high density solution having
two 4Gb stacked with two chip selects is also available in standard TSOPI package.
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