Other Parts Discussed in Thread: SN75DP139
I want to replace the ch7318 to sn75dp139.
When I have replace the ch7138 with sn75dp139(48pin) (same footprint and pin assignment in my pcb except some control pin) -> data signal pin & power pin = same (3.3vcc) /
but i it does not work , can anyone point my mistake ? i dont know why
some control pin
- ch7318 pin 3(TRIM) : output current increasing +/-10% <--> sn75dp139(SRC):edge rate control
- ch7318 pin 4(HPDEN): HPD inverting/non-inverting selection <--> sn75dp139(I2C_EN) : HDMI/DVI selection\
- ch7318 pin 6(Analog-rext) : 1.2k ohm <--> sn75dp139 : 4.02kohm
- ch7318 pin 34(CCT1) : pre-emphasis control with CCT2 <--> sn75dp139(HPDINV) : HPD inverting /non-inverting selection
- ch7318 pin 35(CCT2) : pre-emphasis control with CCT1 <--> sn75dp139(OVS) :DDC Source level offset selection
before replace( ch7318) : pin3 ,4 : 10kohm pull down./ pin 6 : analog_rext(1.2k/1% ohm) / pin 34,35 : 10kohm pull down
after replace(sn75dp139) : pin3 : 10kohm pull down. / pin4 : 10kohm pull up / pin 6 : 4.02k/1% ohm)/pin 34,35 : 10kohm pull down
