iFix RT809F - Notes; Reading Operation

51 pins,the fourth pin is SDA,the fifth pin is SCL,with a line GND more,remould a ISP upgrading line
with the screen lines;and connect it with the 12C expansion port on locking socket of RT809F,then
can read and write on line using the screen lines port.
Before reading and writing please charge the screen with the 12V power.
4.10.4 Notes
 There are limits to the number of writing times of BUF16821 chips’ internal ROM,the request
from manufacturer is that every BANK can’t be more than 16 times,exceeding the number of
times maybe causes the verifying failure after writing,but as for reading,it has no times limit.
 The BUF16821 chip’s 14pin is SCL,15 pin is SDA,they are connected with the 5
th
pin SCL and
4
th
pin SDA generally；
 16 pin A0 must be grounded,17 pin BKSEL is BANK choose which should be grounded
acquiescently generally,use the first BANK to save the data;
 If the chip has been written for 16 times,when verifying goes wrong,please disconnect this pin
with GND,connect the high level,then the chip choose the 2
nd
BANK automatically to save
data,so it can be written for 16 times more;
 BUF16821 chip type has two kinds of suffix,A and B;the A version’s printing is
“BUF16821”,the B version’s printing is “BUF16821B”,A can replace B absolutely,but B
probably can’t.(There is limit to the threshold value of B version’s VCOM voltage,adjustable
range is small,but A version has no limit.)
4.10.5 Reading Operation
Connect the 12C expansion port of programmer with the TCON board correctly using the converted
screen line,and then charge.Open software to the main interface,click “Smart ID” then it shows
that the chip type is detected.