admin

回复 1# Oleg_Skalskiy

U4 and U5  is a LDO on T56. MODE is AMS11117-1.2V.  Packge is SOT89.
1.U4 Normal voltage about 1.2V always.If it is broken, the programmer maybe not be connected to the computer at the same time.
２.U5 normal voltage is about 3.3V on idle state. If it is broken, self check maybe not passed. and test IO voltage is not correct.


These two components have been replaced for the newly delivered programmer.

admin

And tell me the value of R29
Oleg_Skalskiy 发表于 2022-12-25 20:46

R29 doesn't matter，This is only a discharge resistance of overcurrent protection signal.
it's about 4.7K-22K.

admin

U5 1.2v but produces 3.3
And why is adj not installed. Why is it so hard to do.
U5 exactly at 1.2V ...
Oleg_Skalskiy 发表于 2022-12-25 18:16

下载 (40.63 KB)

2022-12-26 12:55

   AMS1117-1.2V LDO is also adjustable, but the minimum voltage is not less than 1.2V .
  T56  adjust the output voltage of VCCIO through DAC5571
VIOout=Vdacout+1.2V

admin

I have two parallel resistors
22kOm + 5.6kOm = 4.464kOm

Can be replaced by another value.  ...
Oleg_Skalskiy 发表于 2022-12-26 17:09

   It doesn't matter.

admin

This is the test screen.

VPP no j3 j4 j5 j6 j7 j8 no VPP is this normal?
VPP is 11.81 is this n ...
Oleg_Skalskiy 发表于 2022-12-27 17:07

Yes,  VPP +-0.5V,   ISP VPP only J1/J2

admin

回复 13# Oleg_Skalskiy



BGA153-2021_10.rar (631.72 KB)

下载次数: 14675

2022-12-29 10:26

BGA100_2021_10.rar (624.68 KB)

下载次数: 14071

2022-12-29 10:26

1. R1-R9    22 ohm       0603
2. C1 C2    10uf            1206
3. C3         2.2uf           1206
4. C4-C9    0.1uf           0603
5. C10       15P             0603
6. U4  LDO  XC6206-1.8V  SOT23
（it may be more stable when use a 2.0V LDO)