LG LH-T3520X Service Manual page 53

SCK/SCL 79
SI/I2C_AD0 82
/CS/I2C_AD2 83
EXT_MUTE 27
OVERLOAD 76
EPD_ENA 77
TEST_MODE1 97
TEST_MODE2 98
SCAN_ENA 99
TEST_MODE3 100
All inputs and bi-directional inputs are 5 Volt tolerant. The corresponding pins can be connected to the buses that can
swing between 0V and 5V. The output-only pins are not 5V tolerant and the buses they are connected to can swing only
between 0V and 3.3V.
I SCK for SPI mode or SCL for I2C mode.
Schmitt-Trigger input.
I SI for SPI mode or Slave Address 0 for I2C mode.
Schmitt-Trigger input.
Internal pull-down resistor.
I Chip selector (CS) for SPI mode or Slave Address 2 for I2C
mode.
Schmitt-Trigger input.
Internal pull-down resistor.
Special Control Interface
I External mute control input. Active High.
Assert 'HIGH' to mute audio output.
Internal pull-down resistor.
I Power stage overload indication input.
Polarity is programmable. Schmitt-Trigger input.
When OVERLOAD is asserted, all PWM audio outputs go to
"LOW". That shutdown process is programmable.
Internal pull-down resistor.
O External amplifier power device enable output. Active High.
Test Mode
I Test mode selection pin 1.
In normal operation, it should be "LOW" or not connected.
Internal pull-down resistor.
I Test mode selection pin 2.
In normal operation, it should be "LOW" or not connected.
Internal pull-down resistor.
I Scan enable. Active High.
In normal operation, it should be "LOW" or not connected.
Internal pull-down resistor.
I Test mode selection pin 3.
In normal operation, it should be "LOW" or not connected.
Internal pull-down resistor.
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