ICP DAS USA I-7530 User Manual page 61

ГК Атлант Инжиниринг – официальный представитель в РФ и СНГ
2. Adjust the numbers of the TQ by using the scale register, BRP. The
TQ numbers always be in the range of 8 ~ 25. Here, numbers of
the TQ of one bit time is scaled to 20, and the BRP would be as
follows.
3. Use sample point to decide the PRS, PHS1, and PHS2.
Sample point = 60% = (3 + PRS + PHS1) / (4+PRS+PHS1+PHS2)
Numbers of the TQ of one bit time = 20 = (4+PRS+PHS1+PHS2)
"(3 + PRS + PHS1) = 12" can satisfy the sample point 60%.
The PHS2 would be 7. If choose PRS = 2, then PHS1 =7.
4. Generally, the SJW and SMP are set to 0. The SMP is defined as
below:
=> SMP = 0: once, at the sample point.
=> SMP = 1: three times, the threefold sampling of the bus is the
According to the above calculation, the three Bit Time registers are as
following:
Bit Timing 1 register value is
Bit Timing 2 register value is
Bit Timing 3 register value is
Then, the users can fill those parameter values as below:
I-7530, I-7530-FT, I-7530A, I-7565 User's Manual (Version 1.3, Apr/2015) -------- 61
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500 / 20 = 25 = (1+BRP)
BRP = 24
sample point and twice over a distance of a 1/2
period of the T
majority decision of the three values.
0x30.
0x04.
0x7E.
. The result corresponds to the
scl