Teclast X21, Service Manual

Page: 59 / 76

8 DATA Data pin (IIC serial data control)
9 CLOCK Clock pin (IIC serial clock control)
10 NC Unused
11 W/R Read/write control
12 BUSM Bus mode input
13 BUSEN Bus mode gating
14 SWP1 Software program port 1
15 SWP2 Software program port 2
16 XTAL1 Crystal oscillator input 1
17 XTAL2 Crystal oscillator input 2
18 PDLE
19 PHLE
20 NC Unused
21 NC Unused
22 LAVO Left channel audio voltage output
23 RAVO Right channel audio voltage output
24 TMUTE Software mute time constant
25 MPXO FM tuner MPX signal output
26 VREF Voltage reference
27 TCIFC IF adjusts time constant
28 DIFL1 Decouple IF limiter 1
29 DIFL2 Decouple IF limiter 2
30 NC Unused
31 NC Unused
32 IFGAI IF gain control
33 AGND Analog ground
34 AVCC Analog power supply
35 RFI1 F input 1
36 RFGND RF ground
37 RFI2 RF input 2
38 TCAGC RF auto gain control time constant
39 LOOPSW Phase-locked loop filter output gating
40 NC Unused
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