ATA6602-PLQW ATMEL [ATMEL Corporation], ATA6602-PLQW Datasheet - Page 207

• Manufacturer Part Number: ATA6602-PLQW
• Description: Microcontroller with LIN Transceiver, 5V Regulator and Watchdog
• Manufacturer: ATMEL [ATMEL Corporation]

4.17.7.3
4921C–AUTO–01/07
Asynchronous Operational Range
The operational range of the Receiver is dependent on the mismatch between the received bit
rate and the internally generated baud rate. If the Transmitter is sending frames at too fast or too
slow bit rates, or the internally generated baud rate of the Receiver does not have a similar (see
Table
bit.
The following equations can be used to calculate the ratio of the incoming data rate and internal
receiver baud rate.
D
S
S
S
R
Table 4-72
tolerated. Note that Normal Speed mode has higher toleration of baud rate variations.
Table 4-72.
R
F
M
slow
slow
# (Data+Parity Bit)
4-72) base frequency, the Receiver will not be able to synchronize the frames to the start
=
---------------------------------------------
S 1
10
D
5
6
7
8
9
–
and
Sum of character size and parity size (D = 5 to 10 bit)
Samples per bit. S = 16 for Normal Speed mode and S = 8 for Double Speed
mode.
First sample number used for majority voting. S
for Double Speed mode.
Middle sample number used for majority voting. S
S
is the ratio of the slowest incoming data rate that can be accepted in relation to the
receiver baud rate. R
accepted in relation to the receiver baud rate.
+
Recommended Maximum Receiver Baud Rate Error for Normal Speed Mode
(U2Xn = 0)
D
M
Table 4-73 on page 208
D
+
= 5 for Double Speed mode.
1
S
S
+
R
S
F
slow
93.20
94.12
94.81
95.36
95.81
96.17
(%)
fast
R
106.67
105.79
105.11
104.58
104.14
103.78
fast
is the ratio of the fastest incoming data rate that can be
(%)
list the maximum receiver baud rate error that can be
R
Max Total Error (%)
fast
+5.79/-5.88
+5.11/-5.19
+4.58/-4.54
+4.14/-4.19
+3.78/-3.83
+6.67/-6.8
=
-----------------------------------
D
+
ATA6602/ATA6603
D
1
F
+
= 8 for normal speed and S
S
M
2
+
= 9 for normal speed and
S
S
M
Recommended Max
Receiver Error (%)
± 3.0
± 2.5
± 2.0
± 2.0
± 1.5
± 1.5
F
207
= 4