linux-chenxing.org

KLF7816_T2_02

Just a random board from a random DVB-T2 set top box.


That thing

Board front

Schematic for a slightly different version of it (seems to be called “KLF7816_T2_03”).

Specs

IO pad usage

Pin Pad Usage
66 TS1_CLK Demod TS Clock
67 TS1_D7 Demod TS Data7
68 TS1_D6 Demod TS Data6
69 TS1_D5 Demod TS Data5
70 TS1_D4 Demod TS Data4 / SCART aspect ratio
71 TS1_D3 Demod TS Data3
72 TS1_D2 Demod TS Data2
73 TS1_D1 Demod TS Data1
74 TS1_D0 Demod TS Data0
75 TS1_VLD Demod TS Valid
76 TS1_SYNC Demod TS Sync
79 S_GPIO3 SCART switch
80 S_GPIO4 SCART RGB/CVBS switch
81 I2CM0_SDA Frontend SDA
82 I2CM0_SCL Frontend SCL
86 EJ_TMS/GPIO Audio output buffer enable
87 EJ_TDO/GPIO Antenna power status/overload
88 SAR0 Front panel Strobe
89 SAR1 Front panel Data
90 SAR2 Front panel Clock
91 SAR3 Antenna power control
96 GPIO_PM9 Frontend reset
102 GPIO_PM4 System power control

Note:

Connectors

UART

# Label Signal
1 GND Ground
2 RX UART RX (+ ISP SCL)
3 TX UART TX (+ ISP SDA)

Learn about ISP there…

Audio

# Label Signal
1 L Audio Left
2 GND Ground
3 R Audio Right

SCART breakout

# Label Signal
1 S_R Audio Right
2 S_L Audio Left
3 GND Ground
4 S_Pb RGB Blue
5 S_G RGB Green
6 S_Pr RGB Red
7 CVBS CVBS
8 GND Ground
9 RGB SCART Fast switch
10 ACPECT SCART Slow switch

Front panel

# Label Signal
1 DAT Data
2 CLK Clock
3 STB Strobe
4 GND Ground
5 IR IR receiver
6 +5V 5V power
7 LED CEC LED

USB

# Label Signal
1 +5V +5V VBUS
2 DM USB D-
3 DP USB D+
4 GND Ground