Hi team,
customer find the display will flickering when they take temperature test about 947. they have 4 board have this issue, refer to the ERRATA(1V9) to change the register setting, two board is ok, but another two still flickering at around 60C.
below is all register settings, could you help on it? 1 (40) <-10 mean wirite reg 0x40 to 0x10.
Hi Stevn,
we can confirm that it related with tem ramping.
In a stable temperature, 947 can work properly. Now, customer refer to ERRATA, 947 can operate at -40C to 70C in cold-start condition and 80C to -30C in hot-start condition. their desired opertation is -40 to 80C.
firstly customer use below reg setting:
– Reg0x40=0x10 //set Page to oLDI PLL registers
– Reg0x41=0x4A
– Reg0x42=0x3F
– Reg0x41=0x4B
– //Based on temperature reading from external sensor:
• Reg0x42=0x88 //if ambient temp < 10°C
• Reg0x42=0x89 //if 10°C ≤ ambient temp is < 60°C
• Reg0x42=0x8A //if ambient temp is ≥ 60°C
– Reg0x41=0x49
– Reg0x42=0x10 //Reset oLDI PLL
– Reg0x42=0x00
– Reg0x40=0x14 //set Page to FPD PLL registers
– Reg0x41=0x4A
– Reg0x42=0x3F
– Reg0x41=0x4B
– //Based on temperature reading from external sensor:
• Reg0x42=0x89 // if ambient temp < 10°C
• Reg0x42=0x8A //if 10°C ≤ ambient temp is < 60°C
• Reg0x42=0x8B //if ambient temp is ≥ 60degC
– Reg0x41=0x49
– Reg0x42=0x10 //Reset FPD PLL
– Reg0x42=0x00
and, they can dump the reg correctly. below is dumped reg is
